The Fairey Rotodyne was designed and built by Fairey Aviation and intended for commercial and military applications. A development of the earlier Gyrodyne which had established a world helicopter speed record, the Rotodyne featured a tip-jet-powered rotor that burned a mixture of fuel and compressed air bled from two wing-mounted Napier Eland turboprops. The rotor was driven for vertical takeoffs, landings and hovering, and low-speed translational flight, and autorotated during cruise flight with all engine power applied to two propellers. Although promising in concept and entirely successful in trials, the Rotodyne program was eventually cancelled when a combination of politics and the lack of commercial orders doomed the project.
The Fairey Rotodyne was a 1950s British compound gyroplane and basis for the DARPA Transformer program