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File:Variable Density Tunnel - GPN-2000-001311.jpg

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English: The Variable Density Tunnel photographed arriving at the Langley Research Center by rail on February 3, 1922 from the Newport News Shipbuilding and Dry Dock Company. The closed-circuit tunnel, which could run at speeds up to 50 mph (80 km/h), was enclosed in an 80-ton steel enclosure that permitted operations at high pressure (up to 21 atmospheres). Maintaining high pressure permitted realistic testing conditions for airfoils while maintaining relatively low operating speeds, according to the Reynolds Number similarity parameter.
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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-2000-001311 and Alternate ID: L-1990-04352.

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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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current04:21, 9 April 2009Thumbnail for version as of 04:21, 9 April 20093,000 × 2,029 (3.14 MB)BotMultichillT (talk | contribs){{Information |Description={{en|1=The Variable Density Tunnel arrives by rail on February 3, 1922 from the Newport News Shipbuilding and Dry Dock Company. The Tunnel was installed at Langley.}} |Source=[http://dayton.hq.nasa.gov/IMAGES/LARGE/GPN-2000-001

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