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Wing flapping with minimum energyFor slow flapping motions it is found that the minimum energy loss occurs when the vortex wake moves as a rigid surface that rotates about the wing root - a condition analogous to that determined for a slow-turning propeller. The optimum circulation distribution determined by this condition differs from the elliptic distribution, showing a greater concentration of lift toward the tips. It appears that very high propulsive efficiencies are obtained by flapping.
Document ID
19800007775
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Jones, R. T. (NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
September 4, 2013
Publication Date
January 1, 1980
Subject Category
Aerodynamics
Report/Patent Number
A-8076
NASA-TM-81174
Accession Number
80N16035
Funding Number(s)
PROJECT: RTOP 505-31-11-07
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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