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Theoretical Parametric Study of the Relative Advantages of Winglets and Wing-Tip Extensions

Author
Riebe, G. D.
Published
Jan 14, 1977.
Physical Description
1 electronic document
Additional Creators
Heyson, H. H. and Fulton, C. L.
Online Version

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Unclassified, Unlimited, Publicly available.
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Summary
For identical increases in bending moment, a winglet provides a greater gain in induced efficiency than tip extension. Winglet toe angle allows design trades between efficiency and root moment. A winglet shows the greatest benefit when the wing loads are heavy near the tip. Washout diminishes the benefit of either tip modification, and the gain in induced efficiency becomes a function of lift coefficient; thus, heavy wing loadings obtain the greatest benefit from a winglet, and low-speed performance is enhanced even more than cruise performance. Both induced efficiency and bending moment increase with winglet length and outward cant. The benefit of a winglet relative to a tip extension is greatest for a nearly vertical winglet. Root bending moment is proportional to the minimum weight of bending material required in the wing; thus, it is a valid index of the impact of tip modifications on a new wing design.
Other Subject(s)
Collection
NASA Technical Reports Server (NTRS) Collection.
Note
Document ID: 19770010046.
Accession ID: 77N16989.
NASA-TM-X-74003.
Terms of Use and Reproduction
No Copyright.
View MARC record | catkey: 15733313