The McDonnell XV-1 is an experimental Convertiplane developed by McDonnell Aircraft for a joint research program between the United States Air Force and the United States Army to explore technologies
A convertiplane is defined by the Fédération Aéronautique Internationale as an aircraft which uses rotor power for vertical takeoff and landing and converts to fixed-wing lift in normal flight. In the
A USAF CV-22 in flight
A Bell Boeing V-22 Osprey tiltrotor in flight during 2005