Cierva W.11 Air Horse
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The Cierva W.11 Air Horse was a helicopter developed by the Cierva Autogiro Company in the United Kingdom during the mid-1940s. The largest helicopter in the world at the time of its debut, the Air Ho
Cierva W.11 prototype conducts a test flight
Rear view, the three rotors can be seen
Rolls-Royce Merlin
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The Rolls-Royce Merlin is a British liquid-cooled V12 piston aero engine of 27-litre capacity. Developed as a private venture by Rolls-Royce and first run in 1933, the engine became one of the most su
Cierva W.11 Air Horse
…acquired. This determined that a single rotor at the front and the pair at the back of the fuselage was preferred for optimum stability and control. A Rolls-Royce Merlin piston engine in the fuselage drove three 47-foot-diameter (14 m) three-blade rotors mounted on outriggers which projected from the fuselage. The blades…
The Rolls-Royce Merlin
Parallel valve Merlin cylinder head
Merlin 55 ejector exhaust detail, Spitfire LF.VB, EP120
Preserved Merlin 63 showing intercooler radiator, supercharger and carburettor