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Analytical study of a free-wing/free-trimmer conceptThe free-wing/free-trimmer is a NASA-Conceived extension of the free-wing concept intended to permit the use of high-lift flaps. Wing pitching moments are balanced by a smaller, external surface attached by a boom or equivalent structure. The external trimmer is, itself, a miniature free wing, and pitch control of the wing-trimmer assembly is effected through a trailing-edge control tab on the trimmer surface. The longitudinal behavior of representative small free-wing/free-trimmer aircraft was analyzed. Aft-mounted trimmer surfaces are found to be superior to forward trimmers, although the permissible trimmer moment arm is limited, in both cases, by adverse dynamic effects. Aft-trimmer configurations provide excellent gust alleviation and meet fundamental stick-fixed stability criteria while exceeding the lift capabilities of pure free-wing configurations.
Document ID
19780010057
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Porter, R. F. (Battelle Columbus Labs. OH, United States)
Hall, D. W. (Battelle Columbus Labs. OH, United States)
Brown, J. H., Jr. (Battelle Columbus Labs. OH, United States)
Gregorek, G. M. (Battelle Columbus Labs. OH, United States)
Date Acquired
September 3, 2013
Publication Date
February 1, 1978
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-2946
Accession Number
78N18000
Funding Number(s)
CONTRACT_GRANT: NAS4-2378
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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