Cierva C.40

Cierva C.40
Role	Autogyro
National origin	United Kingdom
Manufacturer	British Aircraft Manufacturing Company
Designer	J.A.J. Bennett
First flight	1938
Primary user	Royal Air Force
Number built	9
Developed from	Cierva C.30

The Cierva C.40 was a British autogyro designed by G.B.L. Ellis, Otto Reder, and J.A.J Bennett and assembled by the British Aircraft Manufacturing Company at London Air Park, Hanworth.

The C.40 was the last autogyro produced by the Cierva Autogiro Company, Ltd. Design commenced in July 1936 and continued after Cierva's death in an airliner crash in December of that year. Based on the C.30A Autogiro the C.40 was originally intended to use a higher power version of the Armstrong Siddeley Genet Major engine. Utilizing the lessons of autodynamic rotor development underway since 1933, the C.40 rotor included three flexible blades to suppress vibration and were attached to the rotor hub through inclined flap and drag hinges to give jump-takeoff capability. It had two side-by-side seats in a wooden fuselage and the production version was powered by a Salmson 9NG radial engine, problems with which delayed introduction of the C.40 into service until mid-1938.

In 1938 the British Aircraft Manufacturing Company assembled nine C.40s at London Air Park, Hanworth, and seven were delivered to the Royal Air Force. The remaining two were registered to the Cierva Autogiro Company, one was lost in France in June 1940, and the other was impressed into RAF service.

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