Patent ID: 11964771
Assignee: SIFLY AVIATION, INC.
Field: Transport (Mechanical engineering)
Classification: CPC B  G | IPC B  G

Claim 23:
24. A method of operating an electrically powered rotorcraft having a fuselage and a set of N rotors driven by a set of electric motors and coupled to the fuselage, N≥4, as well as a system controller configured to control operation of the set of N rotors, the method operating under a failure condition preventing ordinary operation of the rotorcraft and comprising, under the failure condition:
entering, by the system controller, into a failsafe mode of operation wherein autorotation of at least four of the rotors is enabled; and
causing, by the system controller, control of electrical braking of each rotor in the set relative to electrical braking of each other rotor in the set, to affect pitch, roll and yaw of the aircraft
wherein each rotor has a rotor hub and a set of blades, wherein each rotor hub is configured to provide a spring force to bias the angle of incidence of each corresponding blade toward approximately zero degrees in the absence of rotor torque.