1948 - project
This project was for an enlarged version of the W.11 which was to have two engines.
P.Lambermont "Helicopters and Autogyros of the World", 1958
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Technical data for Cierva W.11
Engine: 2 x Rolls-Royce Merlin 502 , rated at 1620hp, rotor diameter: 16.47m, weight fully loaded: 11,350kg, cruising speed: 184km/h, inclined climb: 710m/min, absolute ceiling: 9600m, range: 704km