Alvis Leonides
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The Alvis Leonides is a British air-cooled nine-cylinder radial aero engine first developed by Alvis Car and Engineering Company in 1936.
Alvis Leonides on display at the East Midlands Aeropark
Leonides 173 as fitted to the Bristol Sycamore
Alvis Leonides radial engine preserved at the Midland Air Museum
Westland WS-51 Dragonfly
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The Westland WS-51 Dragonfly helicopter was built by Westland Aircraft and is an Anglicised licence-built version of the American Sikorsky S-51.
Alvis Leonides
…a centrifugal clutch and fan cooling). The first production use was the Percival Prince, which flew in July 1948 and the Westland Sikorsky S-51 and Westland WS-51 Dragonfly helicopters. From 1959 the stroke was increased to 4.8 inches for the Series 530 (mainly the Mk. 531 for Twin Pioneers) rated at 640 hp. It was Britain's…
Dragonfly HR.3 of 705 Naval Air Squadron Royal Navy in 1955
Japan Maritime Self Defence Force S-51
British European Airways Sikorsky S-51 in 1953
WS-51 Mk.1A in Royal Thai Air Force Museum in December 2014