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Hypersonic and transonic buzz measurements on the lower pitch flap of the M2-F2 lifting entry configurationFree-oscillation damping measurements at hypersonic and transonic Mach numbers are presented for the lower pitch flap of the M2-F2 reentry vehicle. For the flow and model conditions tested, the damping measurements indicate the absence of hypersonic buzz instability for flap rotation frequencies of 47.3 Hz, 153 Hz, and 360 Hz, the presence of transonic buzz for 47.3 Hz flap, and the absence of transonic buzz for a 115 Hz flap. There are not enough flap damping data for an error estimate based on repeatability, but a partial damping calibration is presented in which an analog computer simulation of random flap response for a known flap damping is fed into the autocorrelation computer and filter combination used for most of the damping measurements.
Document ID
19720014356
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Warner, R. W. (NASA Ames Research Center Moffett Field, CA, United States)
Wilcox, P. R. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 2, 2013
Publication Date
May 1, 1972
Subject Category
Aerodynamics
Report/Patent Number
A-3790
NASA-TN-D-6799
Accession Number
72N22006
Funding Number(s)
PROJECT: RTOP 134-14-07-07
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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