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Upper Surface Blowing Technology as Applied to the YC-14 Airplane
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English
Abstract
The exhaust from a high bypass ratio turbofan engine, passing over the upper surface of a wing and trailing edge flap system, can be deflected by the Coanda effect to create both deflected thrust and supercirculation. This technique, known as “upper surface blowing,” has been applied to the U.S. Air Force/Boeing YC-14 advanced medium STOL transport airplane. Laboratory and wind tunnel tests have shown very efficient turning of the jet flow, large values of supercirculation, and excellent boundary layer control of the external flow on the upper surface of the wing. This combination creates a powered lift system having unusual efficiency and versatility.
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Citation
Wimpress, J., "Upper Surface Blowing Technology as Applied to the YC-14 Airplane," SAE Technical Paper 730916, 1973, https://doi.org/10.4271/730916.Also In
References
- Attinello John S. “Wing-Lift Augmentation Methods for the Improvement of Low-Speed Performance of High Speed Aircraft.” SAE Transactions 64 1956 108 122
- Turner Thomas R. Davenport Edwin J. Riebe John M. “Low-Speed Investigation of Blowing from Nacelles Mounted Inboard and on the Upper Surface of an Aspect Ratio 7.0 35° Swept Wing with Fuselage and Various Tail Arrangements,” NASA Memo 5-1-59L Feb. 3 1959
- Newsom William Jr. “Wind Tunnel Investigation of a Deflected Slipstream Cruise-Fan V/STOL Aircraft Wing,” NASA TN D-4262 NASA Langley Research Center December 1967
- Phelps Arthur E. Letko William Henderson Robert L. “Preliminary Low-Speed Wind Tunnel Investigation of a Semispan STOL Jet Transport Wing with an Upper-Surface Blown Jet Flap.” NASA TN D-7183 Langley Research Center May 1973