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Minimization theory of induced drag subject to constraint conditionsExact analytical solutions in terms of induced drag influence coefficients can be attained which define the spanwise loading with minimized induced drag, subject to specified constraint conditions, for any nonplanar wing shape or number of lift plus wing bending moment about a given wing span station. Example applications of the theory are made to a biplane, a wing in ground effect, a cruciform wing, a V-wing, a planar-wing winglet, and linked wingtips in formation flying. For minimal induced drag, the spanwise loading, relative to elliptic, is outboard for the biplane and is inboard for the wing in ground effect and for the planar-wing winglet. A spinoff of the triplane solution provides mathematically exact equations for downwash and sidewash about a planar vorticity sheet having an arbitrary loading distribution.
Document ID
19790015752
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Deyoung, J. (Vought Corp. Hampton, VA, United States)
Date Acquired
September 4, 2013
Publication Date
June 1, 1979
Publication Information
Publisher: NASA
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-3140
Accession Number
79N23923
Funding Number(s)
CONTRACT_GRANT: NAS1-13500
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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