The only Kay Gyroplane constructed, G-ACVA, was designed by D. Kay and constructed by Oddin, Bradbury and Cull Ltd of Eastleigh, Hants.
Power was a 75 hp Pobjoy, and chief feature of the machine was the positive control of lift by variable incidence of the rotor blades while in flight. Lateral control could be obtained by rocking the rotor spindle, while fore and aft control was by a hinged tailplane and normal elevators.
Engine: 75hp Pobjoy
Rotor diameter: 22 ft
Overall length: 17 ft 11 in
Height: 7 ft 8 in
All Aero 