Sikorsky Helicopter, 1944

Sikorsky Helicopter, 1944

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Caption: A technician at Langley Research Centre sets up equipment for photographing the Sikorsky YR-4B/HNS-1 helicopter as it undergoes wind tunnel experiments. The Sikorsky Company built hundreds of these helicopters during World War II, making it the first mass-produced helicopter.

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Keywords: aviation, black and white, engineer, engineering, fst, full scale tunnel, full scale wind tunnel, full-scale tunnel, full-scale wind tunnel, helicopter, historical, history, langley, langley research centre, r-4, r4, r4 helicopter, science, sikorsky, sikorsky r-4, sikorsky r4, wind tunnel, wind tunnel experiment, wind tunnel test, world war ii, ww2, wwii

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