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Measurements of the Fuel Mileage of a KC-135 Aircraft with and Without WingletsThe KC-135A Winglet Flight Research and Demonstration Program was a joint effort of the Air Force, NASA and the Boeing Military Airplane Company to flight test winglets on the KC-135A. The primary objective of the program was to verify the cruise performance improvements predicted by analysis and wind tunnel tests. Flight test data were obtained for winglets positioned at 15 deg cant/-2 deg incidence, 0 deg cant/-4 deg incidence, 15 deg cant/-4 deg incidence and for winglets off (baseline). Both fuel mileage and drag measurements were obtained. The 15 deg cant/-4 deg incidence winglet configuration provided the greatest performance improvement. The flight test measured fuel mileage improvement for a 0.78 Mach number was 3.1 percent at 8 x 10(5) pounds W/delta and 5.5 percent at 1.05 x 10(6) pounds W/delta. Correcting the flight measured data for surface pressure differences between wind tunnel and flight resulted in a fuel mileage improvement of 4.4 percent at 8 x 10(5) pounds W/delta and 7.2 percent at 1.05 x 10(6) pounds W/delta. The agreement between the fuel mileage and drag data was excellent.
Document ID
Document Type
Conference Paper
Temanson, G. E.
(Boeing Military Airplane Development Seattle, WA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1982
Publication Information
Publication: NASA. Dryden Flight Research Facility KC-135 Winglet Program Rev.
Subject Category
Aircraft Design, Testing And Performance
Distribution Limits
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19840019618Analytic PrimaryKC-135 Winglet Program Review
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