In 1934 the Westland design staff, in co-operation with the Cierva Autogiro Company, produced a large five-seat cabin autogiro in Duralumin tubing, powered with a 600hp Armstrong Siddeley Panther engine.
The fuselage was of square-section steel and duralumin tubing, arranged in the characteristic Westland style, with composite stringers and formers to give a deep oval section. The fabric-covered tailplane and vertical and oblique fins were built up of duralumin tubing and pressings, the aerofoil section of the port half of the tailplane being inverted, to offset airscrew torque effect. The seating in the cabin was arranged in the 2-3 plan.
It was much larger and heavier than anything of its kind previously attempted. The Cierva Company was responsible for the rotors and rotor mechanism, the direct control system being employed, while the airframe was designed and built by Westland.
Test of this machine, which was known as the C.29 Autogiro, disclosed vibration problems with the rotor system, which could not be immediately solved. In the circumstances it was decided to shelve this particular design, until further experience had been gained with other experimental autogiros, but the untimely death of Senor Cierva ultimately prevented development of this work. This aircraft never flew.
Engine: Armstrong Siddeley Panther, 600hp
Rotor diameter: 15.23m
Loaded weight: 2268kg
Empty weight: 1461kg