MSL 4316 MR
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MSL 4281-4321 CC
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This photograph illustrates a standard passenger van modified at the Dryden Flight Research Center (now NASA's Armstrong Flight Research Center to investigate the aerodynamics of trucks. The resulting vehicle—re-fashioned with sheet metal—resembled a motor home, with rounded vertical corners on the vehicle's front and rear sections. For subsequent tests, researchers installed a "boat tail" structure, shown in the photograph.

During a decade spanning the 1970s and 1980s, Dryden researchers conducted tests to determine the extent to which adjustments in the shape of trucks reduced aerodynamic drag and improved efficiency. During the tests, the vehicle's sides were fitted with tufts, or strings, that showed air flow. The investigators concluded that rounding the vertical corners front and rear reduced drag by 40 percent, yet decreased the vehicle's internal volume by only 1.3 percent. Rounding both the vertical and horizontal corners cut drag by 54 percent, resulting in a three percent loss of internal volume. A second group of tests added a faired underbody and a boat tail, the latter feature resulting in drag reduction of about 15 percent.

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Credit: NASA
Image Number: E-38096
Date: February 18, 1981

Tags:   aerodynamics Dryden Flight Research Center Armstrong Flight Research Center truck

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Check out this week's installment of Weekly Snapshot with Flickr Social. Each week, we highlight some of our favorite photos from Flickr Social. Head on over to the Flickr Social group and start sharing your own photos for a chance to be featured!

Photo ©: Thomas Hawk

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Aerial view of Shuttle Orbiter Enterprise being hoisted into Marshall's Dynamic Test Stand for the Mated Vertical Ground Vibration test (MVGVT). The test marked the first time ever that the entire Space Shuttle elements, an Orbiter, an External Tank (ET), and two Solid Rocket Boosters (SRB), were mated together. Purpose of the vibration tests was to verify that the Space Shuttle performed its launch configuration as predicted.

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Credit: NASA
Image Number: 7992403
Date: October 4, 1978

Tags:   Enterprise Dynamic Test Stand Mated Vertical Ground Vibration Test

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