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Flight measurements of buffet characteristics of the F-104 airplane for selected wing-flap deflectionsA flight program was conducted on the F-104 airplane to investigate the effects of moderate deflections of wing leading- and trailing-edge flaps on the buffet characteristics at subsonic and transonic Mach numbers. Selected deflections of the wing leading and trailing-edge flaps, individually and in combination, were used to assess buffet onset, intensity, and frequency; lift curves; and wing-rock characteristics for each configuration. Increased deflection of the trailing-edge flap delayed the buffet onset and buffet intensity rise to a significantly higher airplane normal-force coefficient. Deflection of the leading-edge flap produced some delay in buffet onset and the resulting intensity rise at low subsonic speeds. Increased deflection of the trailing-edge flap provided appreciable lift increments in the angle-of-attack range covered, whereas the leading-edge flap provided lift increments only at high angles-of-attack. The pilots appreciated the increased maneuvering envelope provided by the flaps because of the improved turn capability.
Document ID
19720022354
Acquisition Source
Legacy CDMS
Document Type
Other - NASA Technical Note (TN)
Authors
Friend, E. L. (NASA Flight Research Center Edwards, CA, United States)
Sefic, W. J. (NASA Flight Research Center Edwards, CA, United States)
Date Acquired
September 2, 2013
Publication Date
August 1, 1972
Subject Category
Aircraft
Report/Patent Number
H-666
NASA-TN-D-6943
Accession Number
72N30004
Funding Number(s)
PROJECT: RTOP 136-63-03-00-24
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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