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Some Static Oscillatory and Free Body Tests of Blunt Bodies at Low Subsonic SpeedsSome blunt-body shapes considered suitable for entry into the earth's atmosphere were tested by both static and oscillatory methods in the Langley stability tunnel. In addition, free-fall tests of some similar models were made in the Langley 20-foot free-spinning tunnel. The results of the tests show that increasing the flare of the body shape increased the dynamic stability and that for flat-faced shapes increasing the corner radius increased the stability. The test data from the Langley stability tunnel were used to compute the damping factor for the models tested in the langley 20-foot free-spinning tunnel. For these cases in which the damping factor was low, -1/2 or less, the stability was critical and sensitive to disturbance. When the damping factor was about -2, damping was generally obtained.
Document ID
19980228371
Acquisition Source
Headquarters
Document Type
Other - NASA Memorandum (MEMO)
Authors
Lichtenstein, Jacob H. (NASA Langley Research Center Hampton, VA United States)
Fisher, Lewis R. (NASA Langley Research Center Hampton, VA United States)
Scher, Stanley H. (NASA Langley Research Center Hampton, VA United States)
Lawrence, George F. (NASA Langley Research Center Hampton, VA United States)
Date Acquired
September 6, 2013
Publication Date
April 1, 1959
Subject Category
Aircraft Design, Testing And Performance
Report/Patent Number
L-157
NASA-MEMO-2-22-59L
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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