Cierva W.9 - jet efflux torque compensation design. Built in 1944 and flown in 1945.
Hafner Rotabuggy (also known as "Malcolm Rotaplane" and "M.L. 10/42 Flying Jeep") - rotary wing glider attachment for landing jeeps. Tested in 1944 but introduction of vehicle-carrying gliders led to cancellation of project.
Hafner Rotachute - one-man rotor-kite for landing assault troops. Not adopted but used instead for testing in support of Rotabuggy project
Sikorsky "Hoverfly" I - service name for
Sikorsky R-4 used at RAF Helicopter Training School from 1945