Patent Publication Number: US-2020277080-A1

Title: Systems and methods for in-flight operational assessment

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application claims the benefit of priority of U.S. Provisional Patent Application Ser. No. 62/812,215, filed on Feb. 28/2019, and titled “METHODS AND SYSTEMS FOR IN-FLIGHT OPERATIONAL ASSESSMENT,” which is incorporated by reference herein in its entirety. 
    
    
     FIELD OF THE INVENTION 
     The present invention generally relates to an in-flight assessment of the power output capability of an energy source incorporated into an electrically powered aircraft during flight. In particular, the present invention is directed to methods and systems for in-flight operational assessment. 
     BACKGROUND 
     During flight, an electric aircraft will utilize energy and power from the onboard energy source thus reducing the overall capability of the energy source to deliver power or energy. During landing, there is a high peak power demand on the energy source which is needed to provide a controlled vertical descent. There may exist situations where the energy source may not be able to supply adequate power for landing following the originally planned or modified flight mission due to the demand and use of the energy source during takeoff and cruising activities. As a result, a safe and accurate landing may not be achievable and can present a serious impediment to the use of such aircraft for transportation of passengers or cargo. 
     SUMMARY OF THE DISCLOSURE 
     In one aspect, a system for in-flight operational assessment. The system comprises an energy source mechanically coupled to an electric aircraft, wherein the energy source is configured to power at least a portion of the electric aircraft. The system further comprises a sensor mechanically coupled to the electric aircraft, wherein the sensor is configured to detect an electrical parameter of the energy source. The system further comprises a controller communicatively connected to the sensor, wherein the controller is designed and configured to receive the electrical parameter of the energy source from the sensor, determine, using the electrical parameter, a power-production capability of the energy source, calculate a projected power-consumption need of the electric aircraft, and compare the determined power-production capability of the energy source to a projected power-consumption. The system further comprises a graphical user interface communicatively connected to the controller, wherein the graphical user interface is designed and configured to display at least an element of the power-production capability of the energy source based upon the comparison of the power-production capability and the projected power-consumption. 
      In another aspect, a method of in-flight operational assessment. The method comprises detecting, by a sensor, an electrical parameter of at least an energy source of an electric aircraft. The method further comprises receiving, by a controller, the electrical parameter of the at least an energy source from the sensor, determining, by the controller, a power-production capability of the energy source, using the electrical parameter, calculating, by the controller, a projected power-consumption need of the electric aircraft, and comparing, by the controller, the determined power-production capability of the energy source to a projected power-consumption. The method further comprises displaying, by a graphical user interface, at least an element of the power-production capability of the energy source. 
     These and other aspects and features of non-limiting embodiments of the present invention will become apparent to those skilled in the art upon review of the following description of specific non-limiting embodiments of the invention in conjunction with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For the purpose of illustrating the invention, the drawings show aspects of one or more embodiments of the invention. However, it should be understood that the present invention is not limited to the precise arrangements and instrumentalities shown in the drawings, wherein: 
         FIG. 1  is a block diagram depicting an exemplary embodiment of a system for in-flight operational assessment; 
         FIG. 2  is a circuit diagrams depicting an exemplary embodiment of an energy source; 
         FIGS. 3A-B  are schematic diagrams depicting an exemplary embodiment of an energy source and sensors and an aircraft; 
         FIG. 4  is a flow chart illustrating the method of operational in-flight assessment; 
         FIG. 5  is a graph illustrating an exemplary embodiment of open circuit voltage and derivative with respect to state of charge of open circuit voltage, plotted against state of charge; 
         FIGS. 6A-B  are graphs illustrating exemplary embodiments of hover time plotted as a function of current versus terminal voltage; 
         FIG. 7  is a graph showing the state of charge of an energy source as a function of time; 
         FIG. 8  is a graph showing the power demand of load as a function of time in an exemplary embodiment wherein landing of an electric aircraft is delayed, leaving insufficient power for an intended high power vertical landing; 
         FIG. 9A-B  is an exemplary embodiment of a display of an element of the power-production capability by a graphical user interface; and 
         FIG. 10  is a block diagram of a computing system that can be used to implement any one or more of the methodologies disclosed herein and any one or more portions thereof. 
     
    
    
     The drawings are not necessarily to scale and may be illustrated by phantom lines, diagrammatic representations and fragmentary views. In certain instances, details that are not necessary for an understanding of the embodiments or that render other details difficult to perceive may have been omitted. 
     DETAILED DESCRIPTION 
     At a high level, aspects of the present disclosure are directed to systems and methods for in-flight operational assessment. Embodiments of the systems and methods disclosed herein describe an in-flight operational assessment of an energy source for an electric aircraft by a novel process which determines whether energy source power output capability is sufficient for a landing protocol. In an embodiment, the power output capability of an energy source is determined by measuring an electrical parameter with a sensor communicatively connected to energy source and deducing potential power output, which is compared with the energy required to safety land the aircraft at a chosen position or perform some other part of a flight plan. Embodiments may include a method for modifying a flight plan, for instance by changing to a different landing site and/or method depending on the power output during flight. 
     Referring now to  FIG. 1 , an illustration of an embodiment of in-flight operational assessment (IFOA) system  100  is presented. IFOA system  100  is configured to display at least an element of the power-production capability of the energy source based upon the comparison of the power-production capability and the projected power-consumption need. IFOA system  100  can include energy source  104 , load  108 , controller  112 , sensor  116 , GUI  120 , or any combination thereof. IFOA system  100  may be incorporated in an electric aircraft or other electrically powered vehicle, for instance as described below. IFOA system  100  may be further incorporated into a vertical takeoff and landing aircraft, for instance as described below. 
     With continued reference to  FIG. 1 , in-flight operational system  100  includes an energy source  104  which can be mechanically coupled to an electric aircraft. As used herein, “mechanically coupled” is a process whereby one device, component, or circuit is used to connect two shafts together at their ends for the purpose of transmitting power. In an embodiment, mechanical coupling is used to connect the ends of adjacent parts and/or objects of the electric aircraft. In an embodiment, mechanical coupling is used to join two pieces of rotating electric aircraft components. As an example and without limitation, mechanical coupling may include rigid coupling, such as beam coupling, bellows coupling, bushed pin coupling, constant velocity, split-muff coupling, diaphragm coupling, disc coupling, donut coupling, elastic coupling, flexible coupling, fluid coupling, gear coupling, grid coupling, hirth joints, hydrodynamic coupling, jaw coupling, magnetic coupling, Oldham coupler, sleeve coupling, tapered shaft lock, twin spring coupling, rag joint coupling, universal joints, and the like. 
     Energy source  104  of IFOA system  100  is configured to power at least a portion of an electric vehicle and can include, without limitation, a cell. Energy source  104  may include, without limitation, a generator, a photovoltaic device, a battery cell, a fuel cell such as a hydrogen fuel cell, direct methanol fuel cell, and/or solid oxide fuel cell, or an electric energy storage device; electric energy storage device may include without limitation a capacitor and/or a battery. A person of skill in the art will appreciate that energy source  104  may be designed as to meet the energy or power requirement of various electric vehicles on which IFOA system  100  may be integrated. A person of ordinary skill in the art will further appreciate that energy source  104  can be designed to fit within a designated footprint on the various electric aircraft on which IFOA system  100  may be integrated. 
     Still referring to  FIG. 1 , in an embodiment, energy source  104  may be used to provide consistent electrical power to load  108  during the travel of an electric aircraft, such as during the flight. Energy source  104  may be capable of providing sufficient power for “cruising” and other relatively low-power phases of flight, wherein cruising may consume much energy of the energy source  104 . Further, energy source  104  can also provide electrical power for some higher-power phases of flight as well, particularly when the energy source  104  is at a high state of charge (SOC), as may be the case for instance during takeoff. Energy source  104  may be capable of providing sufficient electrical power for auxiliary loads including without limitation, lighting, navigation, communications, de-icing, steering or other systems requiring power or energy. Energy source  104  may be capable of providing sufficient power for controlled descent and landing protocols, including, without limitation, hovering descent or runway landing. As used herein, an energy source  104  may have high power density wherein the electrical power the energy source can usefully produce per unit of volume, and/or mass, is relatively high. Energy source  104  may include a device for which power that may be produced per unit of volume and/or mass has been optimized, at the expense of the maximal total specific energy density or power capacity, during design. 
     Continuing to refer to  FIG. 1 , non-limiting examples of items that may be used as an energy source  104  may include batteries used for starting applications including lithium-ion batteries which may include nickel cobalt aluminum (NCA), nickel manganese cobalt (NMC), lithium iron phosphate (LiFePO 4 ), lithium cobalt oxide (LCO), and/or lithium manganese oxide (LMO) batteries, and the like. In some embodiments, said lithium ion batteries can be mixed with another cathode chemistry in order to provide more specific power as an application may require. For example, an application may require lithium metal batteries, wherein the lithium metal batteries include a lithium metal anode that provides high power on demand. An application may further require lithium ion batteries, wherein the lithium ion batteries have a silicon or titanate anode. In some embodiments, energy source  104  may be used to provide electrical power to an electric aircraft or drone, such as an electric aircraft vehicle, during moments requiring high rates of power output, including without limitation takeoff, landing, thermal de-icing and situations requiring greater power output for reasons of stability, such as high turbulence situations, as described in further detail below. A battery may include, without limitation, a battery using nickel based chemistries such as nickel cadmium or nickel metal hydride, a battery using lithium ion battery chemistries such as a nickel cobalt aluminum (NCA), nickel manganese cobalt (NMC), lithium iron phosphate (LiFePO4), lithium cobalt oxide (LCO), and/or lithium manganese oxide (LMO), a battery using lithium polymer technology. An energy source  104  may include, without limitation, lead-based batteries such as without limitation lead acid batteries, metal-air batteries, or any other suitable battery. A battery may further include, without limitation, lithium sulfur batteries, magnesium ion batteries, and/or sodium ion batteries. Batteries may include solid state batteries or supercapacitors or another suitable energy source. Batteries may be primary or secondary or a combination of both. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various devices of components that may be used as energy source  104 . 
     Referring again to  FIG. 1 , an energy source  104  may be mechanically coupled to a load  108 . The load  108  may be further mechanically coupled to a controller. Load  108  may be any device or component that consumes electrical power on demand. Load  108  may include one or more propulsive devices, including without limitation one or more propellers, turbines, impellers, or other devices necessary for take-off, propelling or landing the electric aircraft during flight. The energy source  104  may supply power to the propulsive device. Load  108  may be, without limitation, in the form of a propulsive device. A propulsive device, as described herein, is a component or device used to propel a craft by exerting force on a fluid medium, which may include a gaseous medium such as air or a liquid medium such as water. A propulsive device, as described herein, may include, without limitation, a thrust element. The thrust element may include any device or component that converts the mechanical energy of a motor, for instance in the form of rotational motion of a shaft, into thrust in a fluid medium. The thrust element may include, without limitation, a device using moving or rotating foils, including without limitation one or more rotors, an airscrew or propeller, a set of airscrews or propellers such as contra-rotating propellers, a moving or flapping wing, or the like. a thrust element may include without limitation a marine propeller or screw, an impeller, a turbine, a pump-jet, a paddle or paddle-based device, or the like. 
     Still referring to  FIG. 1 , load  108  may convert electrical energy into kinetic energy; for instance, load  108  may include one or more electric motors. An electric motor, as described herein, is a device that converts electrical energy into mechanical energy, for instance by causing a shaft to rotate. An electric motor may be driven by direct current (DC) electric power. As an example and without limitation, an electric motor may include a brushed DC electric motor or the like. An electric motor may be, without limitation, driven by electric power having varied or reversing voltage levels, such as alternating current (AC) power as produced by an alternating current generator and/or inverter, or otherwise varying power, such as produced by a switching power source. An electric motor may include, for example and without limitation, brushless DC electric motors, permanent magnet synchronous an electric motor, switched reluctance motors, or induction motors. In addition to inverter and/or a switching power source, a circuit driving an electric motor may include electronic speed controllers (not shown) or other components for regulating motor speed, rotation direction, and/or dynamic braking. 
     With continued reference to  FIG. 1 , load  108  may convert electrical energy into heat. As an example and without limitation, load  108  may include resistive loads. As a further example and without limitation, load  108  may convert electrical energy into light. Load  108  may include one or more elements of digital or analog circuitry. For instance and without limitation, load  108  may consume power in the form of voltage sources to provide a digital circuit&#39;s high and low voltage threshold levels, to enable amplification by providing “rail” voltages, or the like. Load  108  may include, as a non-limiting example, control circuits, aircraft controllers and/or controllers as described in further detail below. The energy source  104  may connect to load  108  using an electrical connection enabling electrical or electromagnetic power transmission, including any conductive path from an energy source  104  to load  108 , any inductive, optical or other power coupling such as an isolated power coupling, or any other device or connection usable to convey electrical energy from an electrical power, voltage, or current source. The electrical connection may include, without limitation, a distribution bus. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various devices that may be used as the a load  108 . 
     Continuing to refer to  FIG. 1 , the IFOA system  100  includes a controller  112 . Controller  112  may include and/or communicate with any computing device as described in this disclosure, including without limitation a microcontroller, microprocessor, digital signal processor (DSP) and/or system on a chip (SoC) as described in this disclosure. Controller  112  may be installed in an aircraft, may control the aircraft remotely, and/or may include an element installed in the aircraft and a remote element in communication therewith. Controller  112  may include, be included in, and/or communicate with a mobile device such as a mobile telephone or smartphone. Controller  112  may include a single computing device operating independently, or may include two or more computing device operating in concert, in parallel, sequentially or the like; two or more computing devices may be included together in a single computing device or in two or more computing devices. Controller  112  with one or more additional devices as described below in further detail via a network interface device. Network interface device may be utilized for connecting a controller  112  to one or more of a variety of networks, and one or more devices. Examples of a network interface device include, but are not limited to, a network interface card (e.g., a mobile network interface card, a LAN card), a modem, and any combination thereof. Examples of a network include, but are not limited to, a wide area network (e.g., the Internet, an enterprise network), a local area network (e.g., a network associated with an office, a building, a campus or other relatively small geographic space), a telephone network, a data network associated with a telephone/voice provider (e.g., a mobile communications provider data and/or voice network), a direct connection between two computing devices, and any combinations thereof. A network may employ a wired and/or a wireless mode of communication. In general, any network topology may be used. Information (e.g., data, software etc.) may be communicated to and/or from a computer and/or a computing device. Controller  112  may include but is not limited to, for example, a controller or cluster of computing devices in a first location and a second computing device or cluster of computing devices in a second location. Controller  112  may include one or more computing devices dedicated to data storage, security, distribution of traffic for load balancing, and the like. Controller  112  may distribute one or more computing tasks as described below across a plurality of computing devices of computing device, which may operate in parallel, in series, redundantly, or in any other manner used for distribution of tasks or memory between computing devices. Controller  112  may be implemented using a “shared nothing” architecture in which data is cached at the worker, in an embodiment, this may enable scalability of IFOA system  100  and/or computing device. 
     With continued reference to  FIG. 1 , controller  112  may be communicatively connected to a sensor and the load  108 . As used herein, “communicatively connecting” is a process whereby one device, component, or circuit is able to receive data from and/or transmit data to another device, component, or circuit; communicative connection may be performed by wired or wireless electronic communication, either directly or by way of one or more intervening devices or components. In an embodiment, communicative connecting includes electrically coupling an output of one device, component, or circuit to an input of another device, component, or circuit. Communicative connecting may be performed via a bus or other facility for intercommunication between elements of a computing device as described in further detail below in reference to  FIG. 10 . Communicative connecting may include indirect connections via “wireless” connection, low power wide area network, radio communication, optical communication, magnetic, capacitive, or optical coupling, or the like. Controller  112  may include any computing device or combination of computing devices as described in detail below in reference to  FIG. 10 . Controller  112  may include any processor or combination of processors as described below in reference to  FIG. 10 . Controller  112  may include a microcontroller. Controller may be incorporated in the electric aircraft or may be in remote contact. 
     Still referring to  FIG. 1 , controller  112  may be communicatively connected, as defined above, to the load  108 . As used herein, controller  112  is communicatively connected to the load wherein controller  112  is able to transmit signals to the load and the load is configured to modify an aspect of load behavior in response to the signals. As a non-limiting example, controller  112  may transmit signals to load  108  via an electrical circuit connecting controller  112  to the load  108 . As an example and without limitation, the circuit may include a direct conductive path from controller  112  to the load or may include an isolated coupling such as an optical or inductive coupling. Alternatively or additionally, controller  112  may communicate with the load  108  using wireless communication, such as without limitation communication performed using electromagnetic radiation including optical and/or radio communication, or communication via magnetic or capacitive coupling. Persons skilled in the art will be aware, after reviewing the entirety of this disclosure, of many different forms and protocols of communication that may be used to communicatively couple controller  112  to a load  108 . 
     In an embodiment and still referring to  FIG. 1 , controller  112  may include a reconfigurable hardware platform. A “reconfigurable hardware platform,” as used herein, is a component and/or unit of hardware that may be reprogrammed, such that, for instance, a data path between elements such as logic gates or other digital circuit elements may be modified to change an algorithm, state, logical sequence, or the like of the component and/or unit. This may be accomplished with such flexible high-speed computing fabrics as field-programmable gate arrays (FPGAs), which may include a grid of interconnected logic gates, connections between which may be severed and/or restored to program in modified logic. Reconfigurable hardware platform may be reconfigured to enact any algorithm and/or algorithm selection process received from another computing device and/or created using machine-learning and/or neural net processes as described below. 
     In an embodiment and continuing to refer to  FIG. 1 , where in-flight operational assessment IFOA system  100  is incorporated into an electric aircraft, controller  112  is programmed to operate electronic aircraft to perform a flight maneuver. As described herein, at least a flight maneuver may include takeoff, landing, stability control maneuvers, emergency response maneuvers, regulation of altitude, roll, pitch, yaw, speed, acceleration, or the like during any phase of flight. As an example and without limitation, at least a flight maneuver may include a flight plan or sequence of maneuvers to be performed during a flight plan. As a further example and without limitation, at least a flight maneuver may include a runway landing. A runway landing, as defined herein, is a landing in which a fixed-wing aircraft, or other aircraft that generates lift by moving a foil forward through air, flies forward toward a flat area of ground or water, alighting on the flat area and then moving forward until momentum is exhausted on wheels or, in the case of landing on water, pontoons; momentum may be exhausted more rapidly by reverse thrust using propulsors, mechanical braking, electric braking, or the like. As a further non-limiting example, a flight maneuver may include a vertical landing protocol. Vertical landing protocol may include, without limitation, a rotor-based landing, such as one performed by rotorcraft such as helicopters or the like. In an embodiment and without limitation, vertical landing protocols may require greater expenditure of energy than runway-based landings. Vertical landing protocol may, for instance and without limitation, require substantial expenditure of energy to maintain a hover or near-hover while descending, while runway-based landings may, as a non-limiting example, require a net decrease in energy to approach or achieve aerodynamic stall. Controller  112  may be designed and configured to operate electronic aircraft via fly-by-wire. 
     With continued reference to  FIG. 1 , controller  112  may direct loads, which may include the a load  108 , to perform one or more flight maneuvers as described above, including takeoff, landing, and the like. As an example and without limitation, controller  112  may be configured to perform a partially and/or fully automated flight plan. In an embodiment and without limitation, controller  112  may be configured to command the load  108  to increase power consumption, such as to transition to rotor-based flight at aerodynamic stall during a vertical landing procedure or to a runway based controlled descent. In an embodiment and without limitation, controller  112  may determine a moment to send a command to an instrument to measure time, such as a clock, by receiving a signal from one or more sensors, or a combination thereof. As a further example and without limitation, controller  112  may determine, by reference to a clock and/or navigational systems and sensors, that electric aircraft is approaching a destination point, reduce airspeed to approach aerodynamic stall, and may generate a timing-based prediction for the moment of aerodynamic stall to compare to a timer, while also sensing a velocity or other factor consistent with aerodynamic stall before issuing the command. Persons skilled in the art will be aware, upon reviewing the entirety of this disclosure, of various combinations of sensor inputs and programming inputs that controller  112  may use to guide, modify, or initiate flight maneuvers including landing, steering, adjustment of route, and the like. 
     Still referring to  FIG. 1 , controller  112  may be communicatively connected to sensor  116 . Sensors, as described herein, are any device, module, and/or subsystems, utilizing any hardware, software, and/or any combination thereof to detect events and/or changes in the instant environment and communicate the information to the a controller. Sensor  116  may be mechanically coupled, as described above, to the electric aircraft. Sensor  116  may be configured to detect an electric parameter of the energy source  104 . Sensors  116  may be used to monitor the status of the system of both critical and non-critical functions. Sensor  116  may be incorporated into vehicle or aircraft or be remote. As an example and without limitation, sensor  116  may be configured to detect the electrical parameter of the energy source  104 . Electrical parameters may include, without limitation, voltage, current, impedance, resistance, temperature. As an example and without limitation, current may be detected by using a sense resistor in series with the circuit and measuring the voltage drop across the resister, or any other suitable instrumentation and/or methods for detection and/or measurement of current As a further example and without limitation, voltage may be detected using any suitable instrumentation or method for measurement of voltage, including methods for estimation as described in further detail below. Each of resistance, current, and voltage may alternatively or additionally be calculated using one or more relations between impedance and/or resistance, voltage, and current, for instantaneous, steady-state, variable, periodic, or other functions of voltage, current, resistance, and/or impedance, including without limitation Ohm&#39;s law and various other functions relating impedance, resistance, voltage, and current with regard to capacitance, inductance, and other circuit properties. Alternatively, or additionally, sensor  116  may be wired to an energy source  104  via, for instance, a wired electrical connection. Detecting an electrical parameter may include calculating an electrical parameter based on other sensed electrical parameters, for instance by using Ohm&#39;s law to calculate resistance and/or impedance from detected voltage and current levels. 
     Continuing to refer to  FIG. 1 , sensor  116  may include, as an example and without limitation, an environmental sensor. As used herein, an environmental sensor may be used to detect ambient temperature, barometric pressure, air velocity, motion sensors which may include gyroscopes, accelerometers, inertial measurement unit (IMU), various magnetic, humidity, and/or oxygen. As another non-limiting example, sensor  116  may include a geospatial sensor. As used herein, a geospatial sensor may include optical/radar/Lidar, GPS and may be used to detect aircraft location, aircraft speed, aircraft altitude and whether the aircraft is on the correct location of the flight plan. a sensor  116  may be located inside the electric aircraft; sensor may be inside a component of the aircraft. In an embodiment, environmental sensor may sense one or more environmental conditions or parameters outside the electric aircraft, inside the electric aircraft, or within or at any component thereof, including without limitation an energy source  104 , a propulsor, or the like. The environmental sensor may further collect environmental information from the predetermined landing site, such as ambient temperature, barometric pressure, air velocity, motion sensors which may include gyroscopes, accelerometers, inertial measurement unit (IMU), various magnetic, humidity, and/or oxygen. The information may be collected from outside databases and/or information services, such as Aviation Weather Information Services. Sensor  116  may detect an environmental parameter, a temperature, a barometric pressure, a location parameter, and/or other necessary measurements. Sensor  116  may detect voltage, current, or other electrical connection via a direct method or by calculation. This may be accomplished, for instance, using an analog-to-digital converter, one or more comparators, or any other components usable to detect electrical parameters using an electrical connection that may occur to any person skilled in the art upon reviewing the entirety of this disclosure. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various ways to monitor the status of the system of both critical and non-critical functions. 
     With continued reference to  FIG. 1 , controller  112  may be configured to receive an electrical parameter of the energy source  104  from sensor  116 . The electrical parameter of energy source  104  is any electrical parameter, as described above. Controller  112  may be further configured to determine, using the electrical parameter, a power-production capability of the electrical energy source. Power-production capability, as described herein, is a capability to deliver power and/or energy to a load or component powered by an electrical energy source. A power-production capability may include a power delivery capability. As an example and without limitation, power delivery capability may include peak power output capability, average power output capability, a duration of time during which a given power level may be maintained, and/or a time at which a given power level may be delivered, including without limitation a peak and/or average power output capability. The time is provided in terms of a measurement of time in seconds and/or other units from a given moment, a measure of time in seconds and/or other units from a given point in a flight plan, or as a given point in a flight plan, such as, without limitation, a time when power may be provided may be rendered as a time at which an aircraft arrives at a particular stage in a flight plan. As an example and without limitation, power-production capability may indicate whether peak power may be provided at or during a landing stage of flight. Power-production capability may include, as a further example and without limitation, energy delivery capability, such as a total amount of remaining energy deliverable by a given electrical energy source, as well as one or more factors such as time, temperature, or rate that may affect the total amount of energy available. As a non-limiting example, circumstances that increase output impedance and/or resistance of an electrical energy source, and thus help determine in practical terms how much energy may actually be delivered to components, may be a part of energy delivery capability. 
     Continuing to refer to  FIG. 1 , controller  112  may be further configured to calculate a projected power-consumption need of the electric aircraft. The projected power-consumption need of electric aircraft is calculated as a function of a flight plan for the electric aircraft. As used herein, a “power-consumption need” includes an energy and/or power need of a component or system, including any component that consumes power, any set of two or more components that consume power, and/or any system that consumes power, such as, without limitation, plurality of propulsors, electric aircraft, and/or components thereof. As an example and without limitation, power-consumption need may include peak power consumption needs, average power consumption needs, duration of a given power consumption need, such as duration for which peak power consumption and/or average power consumption is needed, a time, as described above in reference to power-production capability at which a given power level will be needed, and the like. As a further example and without limitation, power-consumption need may include a need to consume peak power, during a landing stage of a flight plan, for a sufficient duration of time to accomplish a landing maneuver, such as without limitation a hovering landing as described in further detail below. As another non-limiting example, power-consumption need may include an energy consumption need, such as a total amount of energy needed to perform an entire flight plan, one or more stages of a flight plan, or one or more flight maneuvers. Energy consumption need may include as a non-limiting example, energy needed to power essential flight components such as propulsors, non-essential components such as certain lights or other electrical apparatuses in electric aircraft, and any buffer or reserve energy amount required, such as a reserve energy amount required for emergent situations. 
     With continuing reference to  FIG. 1 , controller  112  may further include determining whether the power-production capability is sufficient for the projected power-consumption need. In an embodiment, controller  112  may create a first number representing power-production capability of an electrical source  104  and a second number representing a projected power-consumption need of electrically powered aircraft  304  and compare the two numbers; controller  112  may maintain a buffer number by which power-production capability must exceed a projected power-consumption need. Controller  112  may determine that power-production capability is sufficient for projected power-consumption need if the two numbers are equal; controller  112  may determine that power-production capability is sufficient for a projected power-consumption need if power-production capability exceeds a projected power-consumption need by buffer number. Controller  112  may perform this calculation using lookup tables or mathematical relations as described herein. As an example and without limitation, controller  112  may retrieve from a lookup table a potential level necessary to drive a propulsor at a given velocity. Continuing the non-limiting example, the controller  112  may perform a calculation based on the demands described above which determines a rate of power consumption based on the demand by the propulsors at a given time in flight. This power consumption rate may, without limitation, be used to determine if the power demand of propulsors needed to arrive at the originally selected location using the originally selected landing method is possible given the current energy source capacity. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various alternative means for determining a potential demand of a propulsor as described herein. 
     Still referring to  FIG. 1 , IFOA system  100  further includes graphical user interface (GUI)  120 . Graphical user interface  120  may be communicatively coupled to the energy source  104  and the controller  112 . As described herein, a graphical user interface is a form of user interface that allows users to interact with the controller through graphical icons and/or visual indicators. The user may, without limitation, interact with graphical user interface  120  through direct manipulation of the graphical elements. Graphical user interface  120  may be configured to display at least an element of the power-production capability of the energy source  104 , as described in detail above. As an example and without limitation, graphical user interface  120  may be displayed on any electronic device, as described herein, such as, without limitation, a computer, tablet, remote device, and/or any other visual display device. 
     Referring now to  FIG. 2 , an energy source  104  may include a cell, such as a battery cell, or a plurality of battery cells making a battery module  204 . The energy source  104  may include a plurality of energy sources. Module  204  may include batteries connected in parallel or in series or a plurality of modules connected either in series or in parallel designed to deliver both the power and energy requirements of the application and/or a phase of the operation. Connecting batteries in series may increase the voltage of an energy source  104  which may provide more power on demand. High voltage batteries may require cell matching when high peak load is needed. As more cells are connected in strings, there may exist the possibility of one cell failing which may increase resistance in the module and reduce the overall power output as the voltage of the module may decrease as a result of that failing cell. Connecting batteries in parallel may increase total current capacity by decreasing total resistance, and it also may increase overall amp-hour capacity. The overall energy and power outputs of the energy source  104  may be based on the individual battery cell performance or an extrapolation based on the measurement of an electrical parameter. In an embodiment where the energy source  104  includes a plurality of battery cells, the overall power output capacity may be dependent on the electrical parameters of each individual cell. If one cell experiences high self-discharge during demand, power drawn from the energy source  104  may be decreased to avoid damage to the weakest cell. The at least an energy source  104  may further include, without limitation, wiring, conduit, housing, cooling system and battery management system. Persons skilled in the art will be aware, after reviewing the entirety of this disclosure, of many different components of an energy source. 
     Still referring to  FIG. 2 , an energy source  104  may supply power to a plurality of critical functions in the aircraft. Critical functions in the aircraft may include, without limitation, communications, lighting, navigation, de-icing, steering cruising, landing and descents, carried out by a load  108 . High peak loads may be necessary to perform certain landing protocols which may include, but are not limited to, hovering descent or runway descents. During landing, propulsors may demand a higher power than cruising as required to descend in a controlled manner. When an energy source  104  is at high state of charge, it may be capable of supporting a peak load and continued in-flight cruising functions. High peak loads may be necessary to perform certain landing protocols which may include, but are not limited to, hovering descent or runway descents. As an example and without limitation, during landing, propulsors may demand a higher power than cruising as required to descend in a controlled manner. As the energy source  104  approaches a low state of charge, resulting from supporting operations in flight, energy source may not be capable of supporting the peak loads of any mission critical function. The at least an energy source  104  may, without limitation, become substantively discharged during any in-flight function due to in-flight power consumption and unforeseen power and current draws that may occur during flight. As a non-limiting example, the power and current draws may be from environmental conditions, components of the energy source or other factors which impact the energy source state of charge (SOC). SOC, as used herein, is a measure of remaining capacity as a function of time and is described in more detail below. SOC and/or maximum power the energy source  104  can deliver may decrease during flight as the voltage decreases during discharge. SOC and/or power output capacity of an energy source may be associated with an ability of energy source to deliver energy as needed for a task such as driving a propulsor for a phase of flight such as landing, hovering, or the like. As a non-limiting example, other factors, including state of voltage, and/or estimates of state of voltage or other electrical parameters of an energy source, may be used to estimate current state of an energy source  104  and/or future ability to deliver power and/or energy, as described in further detail below. Energy source  104  may be able to support landing according to a given landing protocol during a partial state of charge (PSOC) but this ability may depend on demands required for the landing protocol. Vehicle or aircraft landing power needs may exceed measured power consumption at any particular time in flight. 
     With continued reference to  FIG. 2 , in an embodiment, one energy source  104  may provide power to a plurality of propulsors. As an example and without limitation, the energy source  104  may provide power to all propulsors in an aircraft. Additionally and alternatively, a plurality of the energy source  104  may each provide power to two or more propulsors, such as, without limitation, a “fore” energy source  104  providing power to propulsors located toward the front of an aircraft, while an “aft” energy source provides power to propulsors located toward the rear of the aircraft. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various combinations of energy sources  104  that may each provide power to single or multiple propulsors in various configurations. 
     Still referring to  FIG. 2 , in an embodiment, a single propulsor or group of propulsors may be powered by a plurality of the energy source  104 . As an example and without limitation, two or more energy sources may power one or more propulsors. Two energy sources may include, without limitation, a first energy source having high specific energy density and a second energy source having high specific power density. As a non-limiting example, the two energy sources may be selectively deployed as required for higher-power and lower-power needs. Additionally and alternatively, a plurality of the energy source  104  may be placed in parallel to provide power to the load  108 . For example and without limitation, a plurality of the energy source  104  may be placed in parallel to provide power to the same single propulsor or plurality of propulsors. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various combinations of the energy source  104  that may be used to drive the load  108 . 
     Referring now to  FIG. 3A  and  FIG. 3B , IFOA system  100  may be incorporated in an electric aircraft  300 . Electronic aircraft  300  may be an electric vertical takeoff and landing (eVTOL) aircraft. An electric aircraft may be an aircraft powered by an energy source  104 . Electric aircraft  304  may include one or more wings or foils for fixed-wing or airplane-style flight and/or one or more rotors for rotor-based flight. Electric aircraft  300  may include a controller  112  communicatively and/or operatively mechanically coupled to each wing, foil, and/or each rotor, as described herein. Electric aircraft  300  may be capable of rotor-based cruising flight, rotor-based takeoff, rotor-based landing, fixed-wing cruising flight, airplane-style takeoff, airplane-style landing, and/or any combination thereof. Rotor-based flight, as described herein, is where the aircraft generated lift and propulsion by way of one or more powered rotors coupled with an engine, such as a “quad copter,” multi-rotor helicopter, or other vehicle that maintains its lift primarily using downward thrusting propulsors. Fixed-wing flight, as described herein, is where the aircraft is capable of flight using wings and/or foils that generate life caused by the aircraft&#39;s forward airspeed and the shape of the wings and/or foils, such as airplane-style flight. 
     Still referring to  FIGS. 3A and 3B , a number of aerodynamic forces may act upon the electric aircraft  300  during flight. Forces acting on an electric aircraft  300  during flight may include, without limitation, thrust, the forward force produced by the rotating element of the electric aircraft  300  and acts parallel to the longitudinal axis. Another force acting upon electric aircraft  300  may be, without limitation, drag, which may be defined as a rearward retarding force which is caused by disruption of airflow by any protruding surface of the electric aircraft  300  such as, without limitation, the wing, rotor, and fuselage. Drag may oppose thrust and acts rearward parallel to the relative wind. A further force acting upon electric aircraft  300  may include, without limitation, weight, which may include a combined load of the electric aircraft  300  itself, crew, baggage, and/or fuel. Weight may pull electric aircraft  300  downward due to the force of gravity. An additional force acting on electric aircraft  300  may include, without limitation, lift, which may act to oppose the downward force of weight and may be produced by the dynamic effect of air acting on the airfoil and/or downward thrust from the load  108 . Lift generated by the airfoil may depend on speed of airflow, density of air, total area of an airfoil and/or segment thereof, and/or an angle of attack between air and the airfoil. 
     With continued reference to  FIG. 3A  and  FIG. 3B , sensor  116  may be configured to detect an electrical parameter of an energy source  104  and may be communicatively connected, as defined above, to controller  112 . Sensor  116  may be used to detect a plurality of electrical parameters. In an embodiment, the first electrical parameter may include, without limitation, voltage, current, resistance, or any other parameter of an electrical system or circuit. The second electrical parameter may be a function of the first electrical parameter. A third electrical parameter may be calculated from the first and second electrical parameters as a delta or function. For example, the current may be calculated from the voltage measurement. The resistance may be calculated from using the voltage and current measurements. 
     Continuing to refer to  FIGS. 3A and 3B , a plurality of sensors may be incorporated in IFOA system  100  and/or electric aircraft  300 . Sensors of plurality of sensors may be designed to detect a plurality of electrical parameters or environmental data in-flight, for instance as described above. Plurality of sensors may, as a non-limiting example, include a voltage sensor  304 , wherein voltage sensor  304  is designed and configured to detect the voltage of the energy source  104 . As a further-non-limiting example, the plurality of sensors may include a current sensor  308 , wherein current sensor  308  is designed and configured to detect the current of the energy source  104 . As a further non-limiting example, the plurality of sensors may include a temperature sensor  312 , wherein temperature sensor  312  is designed and configured to detect the temperature of an energy source  104 . As a further non-limiting example, a plurality of sensors may include a resistance sensor  316 , wherein resistance sensor  316  is designed and configured to detect the resistance of an energy source  104 . As another non-limiting example, a plurality of sensors may include an environmental sensor  320 , wherein environmental sensor  320  may be designed and configured to detect a plurality of environmental data including, without limitation, ambient air temperature, barometric pressure, turbulence, and the like. Environmental sensor  320  may be designed and configured, without limitation, to detect geospatial data to determine the location and altitude of the electronically powered aircraft by any location method including, without limitation, GPS, optical, satellite, lidar, radar. Environmental sensor  320 , as an example and without limitation, may be designed and configured to detect at a least a parameter of the motor. Environmental sensor  320  may be designed and configured, without limitation, to detect at a least a parameter of the propulsor. Sensor datum collected in flight, by sensors as described herein, may be transmitted to the controller  112  or to a remote device  324 , which may be any device as described herein and may be used to calculate the power output capacity of an energy source  104  and/or projected energy needs of electric aircraft during flight, as described in further detail below. 
     Referring now to  FIG. 4 , an embodiment of a method  400  of in-flight operational assessment is illustrated. At step  405 , sensor  116  detects an electrical parameter of an energy source  104  of an electric aircraft. A least an electrical parameter may include any electrical parameter as described above, including without limitation a voltage, current, resistance, temperature or environmental parameter. The electrical parameter may be detected, for instance, using any means or method as described above, including using a sensor  116  and/or via an electrical or other connection between controller  112  and an energy source  104 . 
     Continuing to refer to  FIG. 4 , in an embodiment, detecting an electrical parameter may include measuring a voltage. Voltage of a battery cell, a plurality of battery cells, modules or plurality of modules may be detected. Voltage under plurality of loads  108  may be alternatively or additionally detected or sensed. Detecting an electrical parameter may include, without limitation, measuring a current; a current of a battery cell, a plurality of battery cells, modules or plurality of modules may be detected. Detecting an electrical parameter may further include, as a non-limiting example, inferring or calculating an electrical parameter based on sensed electrical parameters, for instance by using Ohm&#39;s law or other relations as described and/or discussed above to calculate resistance and/or impedance from detected voltage and current levels. The electrical parameter may include signal properties such as frequency, wavelength, or amplitude of one or more components of a voltage or current signal. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various electrical parameters, and techniques for detecting such parameters, consistent with this disclosure. 
     Still referring to  FIG. 4 , an electrical parameter may be a current. The sensor  116  may detect current directly or calculate the current given other electrical parameters which include voltage and resistance. Current of, any component, without limitation, in energy source  104 , such as a cell, battery cells, plurality of battery cells may be detected. Current flow through wires, a plurality of wires, or other electrical components by which current is carried may be detected. Current flowing between two components of IFOA system  100  may be detected; the two components may be connected via current carrying wire. In an embodiment, such as where IFOA system  100  is in an electric aircraft, wire gauge may be reduced in order to save on weight, which may be critical to the design of the aircraft, as a non-limiting example. When the wire gauge is reduced, the potential for overload of current in the wire with current may rise. Any current flow that is in excess of the current carrying capability of the wire may cause heat, and rapid heat may be caused when a direct short is created. 
     Still viewing  FIG. 4 , detecting the electrical parameter may include detecting a change in the electrical parameter. In an embodiment and without limitation, the change in voltage as a function of time may be detected. A change in current as a function of time may be detected. This may be accomplished, for example and without limitation, by repeatedly measuring or sampling data detected by a sensor  116  or by controller  112  and using the repeated samples or measurement to calculate changes or rates of change; alternatively or additionally, a curve, graph, or continuum of detected values may be matched to mathematical functions using, for instance, linear approximation, splining, Fourier series calculations, or the like. In an embodiment, detecting a change in an electrical parameter may include detecting a change in a first electrical parameter of the electrical parameter, detecting a change in a second electrical parameter of the electrical parameter, and calculating a dependency of the second electrical parameter on the first electrical parameter. In an embodiment, calculating the change in voltage as a function of time may be used; for instance, voltage may be sampled repeatedly or continuously over a time period, and the rate of change over time may be observed. In another case, detecting the current as a function of voltage may be used; for instance, instantaneous or average voltage may be divided by current according to Ohm&#39;s law to determine resistance, while instantaneous or average impedance may similarly be calculated using formulas relating voltage, current, or other parameters to impedance. Detection of an electrical parameter may be performed via digital sampling; an electrical parameter that is directly detected may be sampled, for instance, at a rate expressed in frequency of sample per second, such as, without limitation, a 10 Hz sample rate, or a 1 kHz sample rate. Directly detected or sampled electrical parameter may be subjected to one or more signal processing actions, including scaling, low-pass filtering, high-pass filtering, band-pass filtering, band-stop filtering, noise filtering, or the like. 
     Still referring to  FIG. 4 , detecting change in first electrical parameter may include inducing the change in the first electrical parameter. For instance, and without limitation, first electrical parameter may include output current of an energy source. Controller  112  may induce an increased output current by increasing an energy demand of one or more components or elements mechanically coupled to an energy source  104  and observe output voltage of an energy source  104  that results from the modified current. Similarly, controller may increase or decrease resistance seen by an energy source  104 , for instance by switching one or more resisters in parallel or in series with load  108 , by modifying a resistance level of a transistor, such as a power FET controlling supply to a load  108 , or the like; output voltage, output current, or other electrical parameters&#39; changes may then be detected. 
     In an embodiment, and still referring to  FIG. 4 , inducing change in first electrical parameter may further include modifying electrical power being supplied to a propulsor of the electronic aircraft from an energy source of the energy source. In an embodiment and without limitation, the controller  112  may reduce power to a propulsor from an energy source  104  to reduce speed or altitude. Alternatively or additionally, controller  112  may increase, without limitation, power to a propulsor from an energy source,  104  increasing speed or altitude. In an embodiment and without limitation, when power to propulsor is increased or decreased relatively briefly, or to a limited extent, there may be a negligible change in speed or altitude as a result of the change. Alternatively or additionally, increases or decreases in power to a propulsor may be balanced by counteracting increases or decreases in power. As a non-limiting example, controller  112  may apply more torque, causing provision of more power to one propulsor of multiple propulsors while applying less torque, and thus providing less power, to another propulsor, such that net increased or decreased power from all propulsors is unchanged; this may be done alternately between sides so a course of electric aircraft  304  is unaltered. Alternatively or additionally, two or more energy sources of an energy source  104  may be mechanically coupled to a motor that has dual (or multiple) windings, each winding going to a different separate energy source. Power to one set of windings may be increased while power to other windings is deceased, such that one source of the energy source  104  has a net increase or decrease in power output while a change in propulsive power from the propulsor is negligible or nonexistent. Multiple energy sources of an energy source  104  may have power increased or decreased, permitting measurement of resulting changes in an electrical parameter for each of multiple energy sources. 
     With continued reference to  FIG. 4 , in an embodiment induced change in first parameter may have one or more signal properties. For instance, and without limitation, induced change may be an impulse function or the like. Alternatively, induced change may be a pulse function representing a step from a first value to a second value followed at some interval to a step back to the first value. Interval may be, as an example and without limitation a period of second, milliseconds, or the like. In an embodiment, parameter values detected for a pulse response may reflect steady-state values more accurately than parameter values detected for an impulse response or vice-versa. For instance, and without limitation, an output impedance of an energy source  104  detected in response to an impulse may differ from an output impedance of the energy source  104  as detected in response to a pulse; as an example, capacitance and/or inductance may cause higher impedances in response to impulse signals and/or high-frequency signals than in response to steadier pulse function signals, the latter of which may have more characteristics in common with power demands of a flight maneuver such as a landing sequence. Although the above description has involved observation of an electrical parameter based on changes to other electrical parameters, in an embodiment, a change in an electrical parameter resulting from a change to another parameter may also be observed. For instance, and without limitation, a change in temperature may induce a change in voltage or current as a function of resistance within an energy source  104 . This may also be observed and used as part of a calculation as set forth in further detail below. 
     With continued reference to  FIG. 4 , at step  410 , controller  112  receives an electrical parameter of the energy source  104  from the sensor  116 . The electrical parameter of the energy source  104  is any electrical parameter as described above in reference to  FIGS. 1-3 . At step  415 . Controller  112  determines a power-production capability of the energy source  104 . The power-production capability is determines using the electrical parameter. As used herein, a power-production capability is a capability to deliver power and/or energy to a load or component powered by an electrical energy source. A power-production capability may include any power delivery capability as described above in reference to  FIGS. 1-3 . 
     With continued reference to  FIG. 4 , determination of power-production capability may be performed by any suitable method, including without limitation using one or more models of the energy source to predict one or more circuit parameters of electric power output; one or more circuit parameters of electric power output may include power, current, voltage, resistance or any other detect of a parameter of an electric circuit. One or more models may include, without limitation, a lookup or reference table providing the one or more circuit parameters based on conditions of an energy source and/or of a circuit containing the energy source; conditions may include, without limitation, a state of charge of the energy source, a temperature of the energy source, a resistance of a load mechanically coupled to the energy source, a current, voltage, or power demand of a circuit or load mechanically coupled to the energy source, or the like. One or more models may include one or more equations, reference, graphs, or maps relating the one or more circuit parameters to one or more conditions as described above. One or more models may be created using data from a data sheet or other data provided by a manufacturer, data received from one or more sensors during operation of in-flight operational assessment IFOA system  100 , simulation generated using a simulation program that models circuit behaviors, analysis of analogous circuits, any combination thereof, or any other predictive and/or sensor-based methods for determining relationships between one or more circuit parameters and one or more conditions. The power capacity of an energy source  104  may decline after each flight cycle, producing a new set of data or reference tables to calculate parameters. 
     Continuing to refer to  FIG. 4 , in an embodiment, state of voltage (SOV) may be used instead of or in addition to state of charge to determine a current state and power-production capability of an energy source  104 . State of voltage may be determined based on open-circuit voltage. Open circuit voltage may, as a non-limiting example, be estimated using voltage across terminals, for instance by subtracting a product of current and resistance, as detected and/or calculated using detected or sampled values, to determine open-circuit voltage. As a non-limiting example, instantaneous current and voltage may be sampled and/or detected to determine Delta V and Delta I, representing instantaneous changes to voltage and current, which may be used in turn to estimate instantaneous resistance. Low-pass filtering may be used, as a non-limiting example, to determine instantaneous resistance more closely resembling a steady-state output resistance of an energy source  104  than from transient effects, either for discharge or recharge resistance. Open-circuit voltage may, in turn be used to estimate depth of discharge (DOD) and/or SOC, for instance by reference to a data sheet graph or other mapping relating open circuit voltage to DOD and/or SOC. Remaining charge in an energy source  104  may alternatively or additionally be estimated by one or more other methods including without limitation current integrator estimate of charge remaining. 
     Still referring to  FIG. 4 , SOV and/or open circuit voltage of an energy source  104  and/or one or more cells or components thereof may be used to determine power-production capability in an embodiment. Discharging a battery to the minimum allowed cell potential may give maximum discharge power. This may be a function of a cell&#39;s open circuit potential and series resistance, as determined for instance using the following equation: 
     
       
         
           
             
               
                 Pcell 
                 . 
                 max 
               
                
               
                   
               
                
               discharge 
             
             = 
             
               
                 ( 
                 
                   Voc 
                   - 
                   
                     Vcell 
                     . 
                     min 
                   
                 
                 ) 
               
               * 
               
                 
                   Vcell 
                   . 
                   min 
                 
                 
                   Cell 
                   . 
                   resistance 
                   . 
                   discharge 
                 
               
             
           
         
       
     
     where Voc is open circuit voltage, Vcell. min is the minimum allowed open circuit potential, and cell. resistance. discharge is a cell&#39;s discharge resistance, which may be calculated in an embodiment as described above. One or more additional calculations may be used to aid in determination of likely future behavior of an electrical energy source. For instance, a derivative of open circuit voltage with respect to SOC may be calculated and/or plotted;  FIG. 5  is a graph illustrating open circuit voltage and the derivative of open circuit voltage with respect to SOC, as plotted against SOC. Alternatively or additionally, a derivative of resistance with respect to SOC may be tracked. 
     In an embodiment, and still referring to  FIG. 4 , determining power-production capability may further include determining a state of charge (SOC) of an energy source  104 . Determining the power-production capability may include comparing an electrical parameter to a curve representing a projected evolution over time of an energy source  104 . In an embodiment and without limitation, SOC vs time may be used to determine the power and energy outputs of the energy source and may represent the available battery capacity. In an embodiment and without limitation, an energy source  104  consists of a plurality of battery cells. SOC may be impacted by the chemistry type and footprint which can affect the charge and discharge rates and the operational range over time. SOC may also be impacted by any component of the system including wiring, conduit, housing or any other hardware which may cause resistance during use. Cycle life of an energy source  104  will also be affected by the number of charge and discharge cycles completed in operation. Capability of an energy source  104  to store energy may decrease after several iterations of the charge/discharge cycle over its lifetime. 
     Still referring to  FIG. 4 , determination of power-production capability may further include modifying a curve as a function of the electrical parameter; for instance, determining may include modifying an SOC curve as a function of the electrical parameter. As an energy source  104  is being used, the available capacity output may be reduced which can be detected as a change in voltage over time. Projected data curves for the power output delivery based on the calculations may be recalculated. As described above, the SOC of an energy source  104  may degrade after each flight and charge and discharge cycle. The new curves generated will be used to determine future power output delivery capabilities. Any or all steps of the method may be repeated in any order. For example, the SOC of an energy source  104  may be calculated more than one time during a flight in order to accurately ensure an energy source  104  has the power output capacity for the landing method and location, as described in further detail below. In an embodiment, controller  112  may compare one or more sampled values of an electrical parameter to curve; where values tend to be more than a threshold amount off of the projected curve, controller  112  may replace that curve with another one representing, for instance, an SOC curve for an energy source  104  that is more aged, and thus has a higher output resistance, for an energy source  104  having a higher temperature resulting in a higher output resistance, or the like. 
     Referring again to  FIG. 4 , an energy source  104  may include a plurality of energy sources connected in series. For instance, energy source  104  may include a set of batteries and/or cells connected in series to achieve a particular voltage, or the like. Determining power-production capability of an energy source  104  may include determining a plurality of component energy capabilities representing the energy capabilities of each energy source of the plurality of energy sources, identifying a lowest component energy capability of the plurality of component energy capabilities, and determining the delivery capability of the energy source as a function of the lowest component energy capability. For instance, and without limitation, one cell or battery connected in series with another cell or battery may have a lower SOC, or otherwise be able to produce less total energy and/or power than the other battery or cell; as a result, an energy source  104  overall may be limited primarily by the cell or battery with lower SOC, making the effective power-production capability overall dependent on the power-production capability of the cell or battery with the lowest SOC. 
     Still referring to  FIG. 4 , in an embodiment, an SOC of an energy source  104  can be calculated with datum obtained from sensor  116 , or a plurality of sensors during flight. Datum may be received at remote device  354  or may be calculated using estimation methods used to estimate the SOC. Datum may include, without limitation, voltage, current, resistance, impedance, and/or temperature of an energy source  104 . These estimations may include, without limitation, coulomb counting, open circuit voltage, impedance, or other models. Estimations may also use lookup tables or equivalent data structures which may be obtained from technical specifications, such as datasheets, describing the energy source behavior under, without limitation, load and environmental conditions. Alternatively or additionally, one or more mathematical relations may be used to determine current SOC while in flight. Persons skilled in the art will be aware, upon reviewing the entirety of this disclosure, will be aware of various combinations of methods used to determine SOC. 
     With continued reference to  FIG. 4 , at step  420 , controller  112  calculates a projected power-consumption need of the electric aircraft. A projected power-consumption need may be calculated as a function of a flight plan for the electric aircraft. As used herein, a “power-consumption need” includes an energy and/or power need of a component or system, including any component that consumes power, any set of two or more components that consume power, and/or any system that consumes power, including without limitation plurality of propulsors, electric aircraft, and/or components thereof. Power-consumption need may include any power-consumption need as described above in reference to  FIGS. 1-3 . 
     In an embodiment and continuing to refer to  FIG. 4 , calculating a projected power-consumption need may include determining a projected power-consumption need of a remaining portion of the flight plan. A projected power-consumption need for performing a given flight plan may be stored in memory accessible to controller  112 . Flight plan may include, without limitation, the geospatial location of the landing site, the calculated distance to the landing site, the time required to reach the landing site, the landing methods. As an example and without limitation, controller  112  may store in its memory projected power-consumption needed to perform a scheduled landing according to a landing protocol called for in flight plan, a likely energy cost of traveling a particular distance while cruising, and the like. Stored energy costs may include one or more dependencies on conditions of flight. For example and without limitation, energy needed to travel a certain distance through the air may depend on speed and direction of wind, air density, degree of turbulence, exterior temperature, or the like. In an embodiment, calculating further includes determining a current state of electric aircraft  300  with respect to flight plan. Determination of current state may include identifying a current location of electronic aircraft  304 . Current location of electric aircraft  300  may be determined using elapsed time of flight, geographical position as calculated by GPS or similar systems, information about current position as received from other parties such as air traffic controllers, and/or optical, radar, or Lidar data identifying landmarks or other geographic features outside electronic aircraft. Calculation may include identifying a remaining portion of flight plan as a function of current state. 
     Still referring to  FIG. 4 , calculation of a projected power-consumption need may be performed using data from an environmental sensor  320 . In an embodiment, calculating the projected power-consumption need further includes receiving a sensor datum from an environmental sensor. Calculating the projected power-consumption need may further include calculating the projected power-consumption need as a function of a sensor datum. Receiving a sensor datum may include, as a non-limiting example, receiving an external temperature. Projected power-consumption needs may, for example and without limitation, increase at high external temperatures owing to less efficient performance of components at high temperatures generally. Similarly, a high external temperature may cause controller  112  to predict that one or more components&#39; temperatures are likely to increase during the flight, causing the one or more components to use energy less efficiently, and increasing the energy needed to perform steps of flight plan. The sensor datum may include, for example and without limitation, a temperature of a component of the electronic aircraft; as noted above, one or more components may perform less efficiently at higher temperatures, or at lower temperatures. Sensor datum may include a degree of turbulence, which may be detected using, for instance, motion data collected using an IMU or the like. A higher degree of turbulence may be used, as a non-limiting example, by controller  112  to predict greater energy consumption needs. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various external sensor data that may be used to predict a projected power-consumption need as used herein. 
     Continuing to refer to  FIG. 4 , at step  525 , controller  112  may determine whether power-production capability is sufficient for a projected power-consumption need. In an embodiment, controller  112  may create a first number representing power-production capability of an electrical source  104  and a second number representing a projected power-consumption need of electrically powered aircraft  304  and compare the two numbers; controller  112  may maintain a buffer number by which power-production capability must exceed a projected power-consumption need. Controller  112  may, for example and without limitation, determine that power-production capability is sufficient for projected power-consumption need if the two numbers are equal. As a further example and without limitation, controller  112  may determine that power-production capability is sufficient for a projected power-consumption need if power-production capability exceeds a projected power-consumption need by buffer number. As another non-limiting example, controller  112  may perform this calculation using lookup tables or mathematical relations as described above. For instance and without limitation, controller  112  may retrieve from a lookup table a potential level necessary to drive a propulsor at a given velocity. The controller  112  may, without limitation, perform a calculation based on the demands described above which determines a rate of power consumption based on the demand by the propulsors at a given time in flight. This power consumption rate may be used to determine if the power demand of propulsors needed to arrive at the originally selected location using the originally selected landing method is possible given the current energy source capacity. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various alternative means for determining a potential demand of a propulsor as described herein. 
     Still referring to  FIG. 4 , controller  112  may determine that the power-production capability is not sufficient for the projected power-consumption needs and modifying the flight plan as a function of the power-production capability. In an embodiment, if the calculated energy need for the first flight plan is not sufficient, controller  112  may analyze a number of options for a second flight plan which will optimize the remaining energy capacity of an energy source  104 . Second flight plan may include a different location based on distance but maintain the original landing protocol. For instance and without limitation, flight plan may include a first landing protocol, and modifying the flight plan further comprises replacing the first landing protocol with a second landing protocol. For example and without limitation, the first landing protocol may be a hovering landing, the second landing protocol is an airplane landing and/or runway-based landing. The landing protocol may include, as a non-limiting example, a vertical landing sequence which further comprises an aerodynamic stall of a wing-based flight followed by a rotor-based flight landing. The landing protocol may include, as a further non-limiting example, a runway approach landing sequence similar to a fixed wing landing protocol. In an electric aircraft, an energy source  104  must have enough capacity to power the aircraft and satisfy the load demand of the plurality of propulsors to execute a safe and accurate landing. In a non-limiting example, if the projected power-consumption need of the first flight plan exceeds the remaining capacity of the energy source at a given time during flight, a second landing protocol may be chosen by the controller  112 . As an example and without limitation, analysis and computation may alternately or additionally be performed by a remote device  354  and transmitted to controller  112 . Second flight plan may include, without limitation, a different landing protocol at the same location as the first flight plan. Second flight plan may further include, without limitation, both a different landing protocol and landing location. Second flight plan may involve, as an example and without limitation, using the same landing protocol at a different landing location. 
     Still referring to  FIG. 4 , at step  430 , a graphical user interface  120  displays at least an element of the power-production capability of the energy source  104 . The graphical user interface  120  may be any graphical user interface as described above in reference to  FIGS. 1-3 . At least an element of the power-production capability includes any power-production capability as described above in reference to  FIGS. 1-4 . The element of the power-production capability may include, for example and without limitation, the remaining time able to use rotor-based flight based on the energy source  104 . 
     Referring now to  FIG. 5 , a graph illustrating open circuit voltage and the discharge resistance with respect to SOC, as plotted against SOC is illustrated. Energy source  104  capable of delivering may, without limitation, be calculated using a SOC vs time curve. Calculation may include, as a non-limiting example, plotting points on SOC vs. time curve to determine a point along the curve an energy source  104 , a component cell, and/or other portion thereof has arrived. Determining a point along the curve may enable controller  112  to predict future potential power output by reference to remainder of curve. For a particular energy source, the design may dictate safe operation SOC conditions as indicated in figures below. As an example and without limitation, a safety reserve, such as a gas tank reserve, may also be designated based on the design characteristics and manufacturing data; such as operating range may by enforced by the controller  112 , energy source  104  may only operate in the designated operating range, and a safety reserve may only be used in cases where a critical functions demand power in order to ensure a safe flight. 
     Referring now to  FIGS. 6A and 6B , power-production capability may be calculated or provided with respect to one or more flight maneuvers. As a non-limiting example, power-production capability may be expressed in terms of hover support time. Hover support time, as described herein, is defined as a period of time for which an energy source is capable of outputting sufficient power to permit electric aircraft to hover.  FIG. 6A  illustrates how hover support time may be mapped against observed terminal potential and current for a plurality of detected potentials. As an example and without limitation, a potential ranging from 4. 1 V to 3. 4 V over a current range of 0 to 160 Amps, may correspond to a hover support time of 5 minutes, while a voltage range over the same current range of 3. 8 to 3. 1 V may correspond to an over time of 3 minutes. Actual behavior of a battery and/or cell may be compared to or plotted over a gradient as represented in  FIG. 6A . For instance, shown in  FIG. 6B  actual behavior of a battery and/or cell may be compared to or plotted over a gradient, where the battery is not able to support the final landing event, as shown by the trajectory line displaying lower than the 0 min line in the incapable region , in this non-limiting example. The trajectory line, as displayed, is a plot of cell voltage versus load current during a flight. The arrows incorporated in  FIG. 6B  show how the battery behavior is revealed during the flight from inception to the failed attempt at landing. Alternatively or additionally, ability to land and/or perform another flight maneuver may similarly be estimated. 
     Referring now to  FIG. 7 , a graph illustrates an SOC of an embodiment of an energy source as a function of time. In an embodiment, determining power-production capability may further include determining a state of charge (SOC) of an energy source  104 . Determining the power-production capability may include, without limitation, comparing an electrical parameter to a curve representing a projected evolution over time of an energy source  104 . In an embodiment, information plotting SOC against time may be used to determine power and energy outputs of the energy source and may represent available battery capacity. In an embodiment, an energy source  104  may consist of a plurality of battery cells. SOC may be impacted by the chemistry type and footprint which can affect the charge and discharge rates and the operational range over time. As an example and without limitation, SOC may also be impacted by any component of IFOA system  100  or an aircraft containing IFOA system  100 , such as wiring, conduit, housing or any other hardware which may cause resistance during use. Cycle life of an energy source  104  will also be affected by the number of charge and discharge cycles completed in operation. As an example and without limitation, capability of an energy source  104  to store energy may decrease after several iterations of a charge/discharge cycle over its lifetime and the graph in  FIGS. 6A-B  may change over time. As a further example and without limitation, capacity of an energy source  104 , when including a plurality of cells connected in series in a module, may decrease due to differences in discharge rates of individual cells in the series connection. For example, discharge rates may be related to or caused by variables such as, without limitation, temperature, initial tolerances, material impurities, porosity, electrolyte density, surface contamination, and/or age. A low-capacity battery cell may discharge more rapidly than other cells in a module. As a non-limiting example, a damaged battery may have lower capacity and will become discharged more rapidly than a healthy battery. 
     Still referring to  FIG. 7 , calculation of power-production capability may further include modifying a curve as a function of the electrical parameter. As an example and without limitation, determining may include modifying an SOC curve as a function of the electrical parameter. As a further example, the energy source  104 , is being used the available capacity output may be reduced. The available capacity output may be, without limitation, detected as a change in voltage over time. In an embodiment, projected data curves for the power output delivery based on the calculations may be recalculated. As described above, the SOC of the energy source  104  may degrade after each flight and/or change and discharge cycle. The new curves generated will be used to determine future power output delivery capabilities. Any or all steps of the method may be repeated in any order. For example and without limitation, the SOC of an energy source  104  may be calculated more than one time during a flight in order to accurately ensure the energy source  104  has the power output capacity for the chosen landing method and location, as described in further detail above. In an embodiment and without limitation, controller  112  may compare one or more sampled values of an electrical parameter to curve, wherein values tend to be more than a threshold amount off of the projected curve. For example and without limitation, controller  112  may replace that curve with another one, such as replacing the curve with one representing an SOC curve for the energy source  104  that is more aged, and thus has a higher output resistance, for an energy source having a higher temperature resulting in a higher output resistance, or the like. 
     Referring now to  FIG. 8 , a graph illustrates the power of the energy source  104  as a function of time. For instance, the graph illustrates a condition where landing of an electric aircraft is delayed. As a result of the delayed landing of an electric aircraft, an energy source  104  is unable to support a power demand for an intended or planned landing. The energy storage capability is a lower power value than the power demanding, which does not allow the electric aircraft to land in the intended format, such as rotor-based flight. 
     Referring now to  FIGS. 9A-9B , an embodiment of the element of the power-production capability of the energy source  104  displayed by a graphical user interface  120 . At least an element of the power production capability may include any element of the power-production capability. As used herein, a power-production capability is a capability to deliver power and/or energy to a load or component powered by an electrical energy source. A power-production capability may include any power delivery capability as described above in reference to  FIGS. 1-8 . As an example and without limitation,  FIG. 9A  illustrates an element of the power production capability of the energy source  104  displayed by a graphical user interface  120 . The power-production capability may be, without limitation, the time remaining in rotor-based flight, such as hover time remaining. Hover time remaining may be, without limitation, displayed in minutes.  FIG. 9A  illustrates a display by a graphic user interface of an electric aircraft with a hover time remaining of about three and a half minutes. As a further example and without limitation,  FIG. 9B  additionally and alternatively illustrates an element of the power production capability of the energy source  104  displayed by a graphical user interface  120 . The power-production capability may be, without limitation, the time remaining in rotor-based flight, such as hover time remaining.  FIG. 9B  illustrates a display by a graphic user interface of an electric aircraft with a hover time remaining of about forty-five seconds. 
     In an embodiment, sensor feedback using any sensor as described above may replace or supplement calculation of potential and/or power consumption requirements. For instance, controller  112  may record sensor feedback indicating angular velocity of and/or torque exerted by a motor in one or more instances, along with corresponding electrical parameters of the circuit driving motor such as voltage, current, power consumed, or the like, and storing values so derived; controller  112  may look up such stored values to determine potential and/or power consumption at a given desired angular speed or torque for a propulsor. Controller  112  may perform interpolation or regression to predict likely potential and/or power consumption at an angular speed and/or torque not specifically recorded. Persons skilled in the art, upon reviewing the entirety of this disclosure, will be aware of various ways in which sensor feedback and calculation may be combined consistently with this disclosure to determine potential and/or power consumption needs of a propulsor and/or plurality of propulsors. 
     In an embodiment, the above-described elements may alleviate problems resulting from systems wherein the in-flight measurement of power output capacity may not meet the demand for power to land the electric aircraft. An in-flight operational assessment and optimization of the remaining in-flight power output capacity will ensure a safe landing mode. The landing mode for electric aircraft has been a challenge for the industry as it tries to optimize the battery for range (not for landing). There are other battery technologies which are capable of very high pulses power for landing, but they store very little energy. Above-described embodiments enable the combination of two power sources in a lightweight and robust configuration compatible with safe and high-performance flight. 
     It is to be noted that any one or more of the aspects and embodiments described herein may be conveniently implemented using one or more machines (e.g., one or more computing devices that are utilized as a user computing device for an electronic document, one or more server devices, such as a document server, etc.) programmed according to the teachings of the present specification, as will be apparent to those of ordinary skill in the computer art. Appropriate software coding can readily be prepared by skilled programmers based on the teachings of the present disclosure, as will be apparent to those of ordinary skill in the software art. Aspects and implementations discussed above employing software and/or software modules may also include appropriate hardware for assisting in the implementation of the machine executable instructions of the software and/or software module. 
     Such software may be a computer program product that employs a machine-readable storage medium. A machine-readable storage medium may be any medium that is capable of storing and/or encoding a sequence of instructions for execution by a machine (e.g., a computing device) and that causes the machine to perform any one of the methodologies and/or embodiments described herein. Examples of a machine-readable storage medium include, but are not limited to, a magnetic disk, an optical disc (e.g., CD, CD-R, DVD, DVD-R, etc.), a magneto-optical disk, a read-only memory “ROM” device, a random access memory “RAM” device, a magnetic card, an optical card, a solid-state memory device, an EPROM, an EEPROM, and any combinations thereof. A machine-readable medium, as used herein, is intended to include a single medium as well as a collection of physically separate media, such as, for example, a collection of compact discs or one or more hard disk drives in combination with a computer memory. As used herein, a machine-readable storage medium does not include transitory forms of signal transmission. 
     Such software may also include information (e.g., data) carried as a data signal on a data carrier, such as a carrier wave. For example, machine-executable information may be included as a data-carrying signal embodied in a data carrier in which the signal encodes a sequence of instruction, or portion thereof, for execution by a machine (e.g., a computing device) and any related information (e.g., data structures and data) that causes the machine to perform any one of the methodologies and/or embodiments described herein. 
     Examples of a computing device include, but are not limited to, an electronic book reading device, a computer workstation, a terminal computer, a server computer, a handheld device (e.g., a tablet computer, a smartphone, etc.), a web appliance, a network router, a network switch, a network bridge, any machine capable of executing a sequence of instructions that specify an action to be taken by that machine, and any combinations thereof In one example, a computing device may include and/or be included in a kiosk. 
       FIG. 10  shows a diagrammatic representation of one embodiment of a computing device in the form of a computer system  1000  within which a set of instructions for causing a control system, such as the vehicle system of  FIG. 10 , to perform any one or more of the aspects and/or methodologies of the present disclosure may be executed. It is also contemplated that multiple computing devices may be utilized to implement a specially configured set of instructions for causing one or more of the devices to perform any one or more of the aspects and/or methodologies of the present disclosure. Computer system  1000  includes a processor  1004  and a memory  1008  that communicate with each other, and with other components, via a bus  1012 . Bus  1012  may include any of several types of bus structures including, but not limited to, a memory bus, a memory controller, a peripheral bus, a local bus, and any combinations thereof, using any of a variety of bus architectures. 
     Memory  1008  may include various components (e.g., machine-readable media) including, but not limited to, a random-access memory component, a read only component, and any combinations thereof. In one example, a basic input/output system  1016  (BIOS), including basic routines that help to transfer information between elements within computer system  1000 , such as during start-up, may be stored in memory  1008 . Memory  1008  may also include (e.g., stored on one or more machine-readable media) instructions (e.g., software)  1020  embodying any one or more of the aspects and/or methodologies of the present disclosure. In another example, memory  1008  may further include any number of program modules including, but not limited to, an operating system, one or more application programs, other program modules, program data, and any combinations thereof. 
     Computer system  1000  may also include a storage device  1024 . Examples of a storage device (e.g., storage device  1024 ) include, but are not limited to, a hard disk drive, a magnetic disk drive, an optical disc drive in combination with an optical medium, a solid-state memory device, and any combinations thereof. Storage device  1024  may be connected to bus  1012  by an appropriate interface (not shown). Example interfaces include, but are not limited to, SCSI, advanced technology attachment (ATA), serial ATA, universal serial bus (USB), IEEE 1094 (FIREWIRE), and any combinations thereof. In one example, storage device  1024  (or one or more components thereof) may be removably interfaced with computer system  1000  (e.g., via an external port connector (not shown)). Particularly, storage device  1024  and an associated machine-readable medium  1028  may provide nonvolatile and/or volatile storage of machine-readable instructions, data structures, program modules, and/or other data for computer system  1000 . In one example, software  1020  may reside, completely or partially, within machine-readable medium  1028 . In another example, software  1020  may reside, completely or partially, within processor  1004 . 
     Computer system  1000  may also include an input device  1032 . In one example, a user of computer system  1000  may enter commands and/or other information into computer system  1000  via input device  1032 . Examples of an input device  1032  include, but are not limited to, an alpha-numeric input device (e.g., a keyboard), a pointing device, a joystick, a gamepad, an audio input device (e.g., a microphone, a voice response system, etc.), a cursor control device (e.g., a mouse), a touchpad, an optical scanner, a video capture device (e.g., a still camera, a video camera), a touchscreen, and any combinations thereof. Input device  1032  may be interfaced to bus  1012  via any of a variety of interfaces (not shown) including, but not limited to, a serial interface, a parallel interface, a game port, a USB interface, a FIREWIRE interface, a direct interface to bus  1012 , and any combinations thereof Input device  1032  may include a touch screen interface that may be a part of or separate from display  1036 , discussed further below. Input device  1032  may be utilized as a user selection device for selecting one or more graphical representations in a graphical interface as described above. 
     A user may also input commands and/or other information to computer system  1000  via storage device  1024  (e.g., a removable disk drive, a flash drive, etc.) and/or network interface device  1040 . A network interface device, such as network interface device  1040 , may be utilized for connecting computer system  1000  to one or more of a variety of networks, such as network  1044 , and one or more remote devices  1048  connected thereto. Examples of a network interface device include, but are not limited to, a network interface card (e.g., a mobile network interface card, a LAN card), a modem, and any combination thereof. Examples of a network include, but are not limited to, a wide area network (e.g., the Internet, an enterprise network), a local area network (e.g., a network associated with an office, a building, a campus or other relatively small geographic space), a telephone network, a data network associated with a telephone/voice provider (e.g., a mobile communications provider data and/or voice network), a direct connection between two computing devices, and any combinations thereof. A network, such as network  1044 , may employ a wired and/or a wireless mode of communication. In general, any network topology may be used. Information (e.g., data, software  1020 , etc.) may be communicated to and/or from computer system  1000  via network interface device  1040 . 
     Computer system  1000  may further include a video display adapter  1052  for communicating a displayable image to a display device, such as display device  1036 . Examples of a display device include, but are not limited to, a liquid crystal display (LCD), a cathode ray tube (CRT), a plasma display, a light emitting diode (LED) display, and any combinations thereof. Display adapter  1052  and display device  1036  may be utilized in combination with processor  1004  to provide graphical representations of aspects of the present disclosure. In addition to a display device, computer system  1000  may include one or more other peripheral output devices including, but not limited to, an audio speaker, a printer, and any combinations thereof. Such peripheral output devices may be connected to bus  1012  via a peripheral interface  1056 . Examples of a peripheral interface include, but are not limited to, a serial port, a USB connection, a FIREWIRE connection, a parallel connection, and any combinations thereof. 
     The foregoing has been a detailed description of illustrative embodiments of the invention. Various modifications and additions can be made without departing from the spirit and scope of this invention. Features of each of the various embodiments described above may be combined with features of other described embodiments as appropriate in order to provide a multiplicity of feature combinations in associated new embodiments. Furthermore, while the foregoing describes a number of separate embodiments, what has been described herein is merely illustrative of the application of the principles of the present invention. Additionally, although particular methods herein may be illustrated and/or described as being performed in a specific order, the ordering is highly variable within ordinary skill to achieve methods, systems, and software according to the present disclosure. Accordingly, this description is meant to be taken only by way of example, and not to otherwise limit the scope of this invention. 
     embodiments have been disclosed above and illustrated in the accompanying drawings. It will be understood by those skilled in the art that various changes, omissions and additions may be made to that which is specifically disclosed herein without departing from the spirit and scope of the present invention.