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Free Picture: Sikorsky HNS-1 (YR-4B)


Free Picture of Sikorsky HNS-1 (YR-4B)

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Description
Black and white stock photo of one of Langley’s Sikorsky YR-4B/HNS-1 helicopters in the 30 x 60 Full Scale Tunnel, October 14th 1944. The technician is setting up camera equipment for stopped-action rotor-blade photos. Sikorsky built hundreds of R-4 helicopters during World War II. It was the first mass-produced helicopter.

Keywords
aircraft, full scale tunnel, helicopter, helicopters, hns-1 yr-4b helicopter, hns-1 yr-4b helicopters, naca, nasa, rotorcraft, sikorsky hns-1 yr-4b helicopter, wind tunnel, wind tunnels,  free photography,  free photo,  free photos,  free picture,  free pictures,  free image,  free images

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