US Patent 10894599 Retractable VTOL rotor systems and methods

A hybrid multi-rotor aircraft, includes a plurality of vertical propulsion rotors and at least one forward propulsion rotor. The aircraft also includes a rotor compartment within for each of the vertical propulsion rotors such that a vertical propulsion rotor may be stowed within its respective rotor compartment. A deployable rotor-compartment cover for each rotor compartment is provided and may be moved to an open state to allow the vertical propulsion rotors to be deployed and moved to a closed state to cover their respective vertical propulsion rotors when the vertical propulsion rotors or in a closed state.