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Variable Density Wind Tunnel

Description View of the interior of the exit cone of the Variable-Density Tunnel (VDT) during its brief period of operation as an open throat design. After a fire, the VDT section engineers decided to convert the tunnel to an open throat design. Operations of the redesigned tunnel began in April 1928, however the engineers could not succeed in getting the new tunnel to operate properly and decided to return to the original closed throat design. The tunnel began closed throat operations in December 1930.

 

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Credit: NASA

Image Number: EL-1999-00390 or L-1928-02283

Date: February 14, 1928

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Uploaded on February 14, 2020
Taken on February 14, 1928