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Drag reductions obtained by modifying a box-shaped ground vehicleA box-shaped ground vehicle was used to simulate the aerodynamic drag of high volume transports, that is, delivery vans, trucks, or motor homes. The coast-down technique was used to define the drag of the original vehicle, having all square corners, and several modifications of the vehicle. Test velocities ranged up to 65 miles per hour, which provided maximum Reynolds numbers of 1 times 10 to the 7th power based on vehicle length. One combination of modifications produced a reduction in aerodynamic drag of 61 percent as compared with the original square-cornered vehicle.
Document ID
19740026336
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Saltzman, E. J. (NASA Flight Research Center Edwards, CA, United States)
Meyer, R. R., Jr. (NASA Flight Research Center Edwards, CA, United States)
Lux, D. P. (NASA Flight Research Center Edwards, CA, United States)
Date Acquired
September 3, 2013
Publication Date
October 1, 1974
Subject Category
Aerodynamics
Report/Patent Number
NASA-TM-X-56027
Report Number: NASA-TM-X-56027
Accession Number
74N34449
Funding Number(s)
PROJECT: RTOP 770-18-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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