U.S. Patent Specifications

An aircraft comprising in combination, a fuselage having an empennage and forward propulsive means, a disk‐shaped aerofoil mounted on said fuselage for universal inclination thereon, means for rotating said aerofoil, a plurality of rotary wing blades mounted for rotation with said disk‐shaped aerofoil, and means for retracting said blades into said aerofoil and for extending said blades outside of said aerofoil.