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| Keywords: Variable Density Tunnel, Being Used by NASA Staff DVIDS718694.jpg en In 1922 at NASA Langley Research Center the National Advisory Committee for Aeronautic NACA completed the Variable Density Tunnel VDT the world's first wind tunnel in which air pressures could be varied Prior to the VDT wind tunnels of substantial size operated at normal atmospheric pressure Because test models were at a smaller scale the aerodynamics effects did not coincide with the results obtained by actual flights of full scale aircraft It was found that when air density could be altered as in the VDT test results using scale models coincided with the results obtained by using full-scale aircraft The VDT made Langley a world leader in aerodynamic research Information from the VDT was used in the designs of well known successful aircraft -- the DC-3 transport the B-117 Flying Fortress and the famous twin-tailed P-38 that helped check the Japanese Zeros in World War II In December 1985 the VDT chamber was designated a National Historic Landmark In October 1989 almost exactly 67 years after the initial operation it was moved from its original location to be permanently displayed beside the H J E Reid Conference Center at NASA Langley in Hampton VA NASA Identifier L3310 2009-09-24 Glenn Research Center https //www dvidshub net/image/718694 718694 2012-10-10 18 37 WASHINGTON DC US PD-USGov Langley Research Center Variable Density Tunnel Images from DoD uploaded by Fæ | ||||
