## 1 Introduction  
The idea of generating propulsion through rotating unbalance is by no means new. In the patent literature, there are already various approaches for so-called centrifugal force drives that propose the use of rotors with asymmetric mass distribution, e.g., [1; 2; 3; 4]. However, these have so far not led to any functional realizations. The proposed methods are controversial in the scientific community, not least because they seem to violate the physical law of conservation of momentum and because the rotating centrifugal force, as a pseudo force, could not cause a lasting translation of the rotor's center of mass. Currently, there are apparently no contributions or discussions on this topic in reputable scientific journals. There is nothing told about this inertial technology in actual publications [5; 6; 7], which review the state of the art in different propulsion technologies for unmanned aerial vehicles (UAV). On the other hand, it is well known that the rotational energy of masses can be successfully utilized for energy storage purposes, as seen in [8; 9; 10; 11; 12], as well as the online contribution [13] by the Max Planck Institute for Plasma Physics. An up-to-date overview of the design and optimization of flywheel energy storage systems in automotive engineering is available in reference [14]. This paper presents to our knowledge the first attempt at quantitative designing a centrifugal force drive that utilizes (1 st) flywheel energy storage and (2 nd) transfers that energy by controlled flywheel unbalance modulation into vehicle movement. Thus, the flywheel on board the vehicle serves as well for energy storage as for vehicle propulsion, too. It is based on known laws of physics, and therefore, such a drive will work in principle. It is shown that a basic requirement for a functional drive is the precise spatial rectification of the vector of the resulting centrifugal force. This, in turn, can be achieved by a rapid temporal impulse modulation of the unbalance-induced force amplitude. To understand such functional drives and discuss the fundamental problems of flywheel propulsion, we have to remember here the relevant physical facts and laws [15; 16; 17]:The law of conservation of angular momentum states that the total angular momentum in a closed rotation system remains constant. Therefore, if no external forces act on the system, the total angular momentum remains unchanged. However, if a force causes an acceleration of the system's mass, the angular velocity and hence the angular momentum will change. In contrast, there is no general conservation law for rotational energy. This is because rotational energy depends on the type of forces and torques acting on the system. If there are no external forces or torques act on the system, the rotational energy remains constant. However, if forces or torques are present and cause linear acceleration of the system, rotational energy is converted into translational energy. If rotational energy is converted into other forms of energy while the angular momentum of the system remains constant, then either the moment of inertia or the rotational axis of the system must change. However, if the rotational axis remains unchanged and the moment of inertia remains constant, then the conversion of rotational energy into other forms of energy will result in a change in the angular momentum of the system. This is caused by the fact that rotational energy changes due to a change in angular velocity. Only physical forces acting on an object from outside are considered real forces in classical physics. These external forces are caused by a direct interaction between the bodies involved and are described, for example, by the law of gravity or Coulomb's law. However, additional forces are observed as a result of translational or rotational acceleration of the reference system: inertial force, centrifugal force, Coriolis force, and Euler force.