A 'Church Army'canteen worker hands over a cup of tea to the pilot of a Sikorsky R-4, the world's first mass produced helicopter, RAF Helicopter School, Andover, UK, 1945
The Sikorsky R-4 was a two-place helicopter designed by Igor Sikorsky with a single, three-bladed main rotor and powered by a radial engine. The R-4 was the world's first large-scale mass-produced helicopter and the first helicopter used by the United States Army Air Forces, Navy, Coast Guard, and the United Kingdom's Royal Air Force and Royal Navy
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