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  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 |
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