The Gadfly HDW.1 (also known as the Thruxton Gadfly) is a 1960s British two-seat cabin autogyro. The autogyro was designed by E. Smith and built by the Gadfly Aircraft Company Limited. It was of welded steel tube construction with a tricycle landing gear and powered by a 165hp (123kW) Rolls-Royce Continental IO-346-A inline piston engine driving a pusher propeller. It has a two-bladed rotor that could be engine-driven for starting. It was completed at Andover in 1967 and registred G-AVKE.
Made by Gadly Aircraft.