File:Sikorsky HNS-1 (YR-4B) - GPN-2000-001729.jpg

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English: One of Langley's Sikorsky YR-4B/HNS-1 helicopters is seen in the 30 x 60 Full Scale Tunnel. 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.
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Source Great Images in NASA Description
Author NASA/LARC/photographer unknown
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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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This image or video was catalogued by Langley Research Center of the United States National Aeronautics and Space Administration (NASA) under Photo ID: GPN-2000-001729 and Alternate ID: L-40416.

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current16:44, 9 April 2009Thumbnail for version as of 16:44, 9 April 20093,000 × 2,175 (2.7 MB)BotMultichillT (talk | contribs){{Information |Description={{en|1=One of Langley's Sikorsky YR-4B/HNS-1 helicopters is seen in the 30 x 60 Full Scale Tunnel. The technician is setting up camera equipment for stopped-action rotor-blade photos. Sikorsky built hundreds of R-4 helicopters d

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