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Comparison of Flight Measured, Predicted and Wind Tunnel Measured Winglet Characteristics on a KC-135 AircraftOne of the objectives of the KC-135 Winglet Flight Research and Demonstration Program was to obtain experimental flight test data to verify the theoretical and wind tunnel winglet aerodynamic performance prediction methods. Good agreement between analytic, wind tunnel and flight test performance was obtained when the known differences between the tests and analyses were accounted for. The flight test measured fuel mileage improvements 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 performance improvement obtained was within the wind tunnel test data obtained from two different wind tunnel models. The buffet boundary data obtained for the baseline configuration was in good agreement with previous established data. Buffet data for the 15 deg cant/-4 deg incidence configuration showed a slight improvement, while the 15 deg cant/-2 deg incidence and 0 deg cant/-4 deg incidence data showed a slight deterioration.
Document ID
19840019623
Document Type
Conference Paper
Authors
Dodson, R. O., Jr. (Boeing Military Airplane Development Seattle, WA, United States)
Date Acquired
August 12, 2013
Publication Date
December 1, 1982
Publication Information
Publication: NASA. Dryden Flight Research Facility KC-135 Winglet Program Rev.
Subject Category
AERODYNAMICS
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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