Aircraft and replacement parts therefor; Aircraft in the nature of lift plus cruise aircraft; Electrically-powered aircraft; Electrically-powered aircraft, operated both by human-pilot and autonomous control; Electrically-powered aircraft capable of both fixed-wing flight and hover flight; Drones and replacement parts therefor; Light aircraft; Rotorcraft and replacement parts therefor; Self-propelled electric vehicle and replacement parts therefor; Unmanned aerial vehicles (UAVs) and replacement parts therefor