The autogyro was designed by E. Smith and built by the Gadfly Aircraft Company Limited. It is of welded steel tube construction with tricycle landing gear, powered by a 165 hp (123 kW) Rolls-Royce Continental IO-346-A inline piston engine driving a pusher propeller. It has a two-bladed rotor that can be engine-driven for starting.
It was completed at Andover in 1967 and registered G-AVKE.[1] After retirement the Gadfly was initially exhibited at the Historic Aircraft Museum at Southend Airport. Latterly it has been displayed at The Helicopter Museum, Weston-super-Mare.