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  • 1
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    Effects of deflected thrust on the stability and performance characteristics of a close-coupled canard fighter configuration (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The effect of deflected thrust on the stability and performance of a close-coupled canard fighter configuration are presented. These results were obtained at low speeds in the Langley V/STOL tunnel. Transonic as well as low-speed results are also presented for an unpowered close-coupled canard and a supercruiser configuration. The V/STOL tunnel data indicate an increase in maximum lift and reductions in drag due to lift with the addition of two-dimensional vectored thrust at the wing inboard trailing edge. The longitudinal pitchup associated with the unpowered configuration at higher angles of attack was significantly reduced with power.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 77-887 , Propulsion Conference; Jul 11, 1977 - Jul 13, 1977; Orlando, FL; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Recent research on powered-lift STOL ground effects (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Early studies of powered-lift STOL concepts indicated that a basic problem of aircraft incorporating such concepts would be a serious adverse ground effect on lift. Experience to date with actual powered-lift STOL aircraft, however, has not borne out this concern. This apparent disagreement is examined and recent research data are used to help explain some of the differences observed. Analysis indicates that most of the disagreement can be attributed to the use of wind tunnel data that were not directly applicable to the airplane because the model did not properly represent some of the design features and operating conditions of the airplane.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 77-574 , V/STOL Conference; Jun 06, 1977 - Jun 08, 1977; Palo Alto, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Low-speed power effects on advanced fighter configurations with two-dimensional deflected thrust (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Wind-tunnel studies at the Langley Research Center have shown that significant increases in maximum lift coefficient and stability and decreases in drag due to lift are obtained when two-dimensional vectored thrust is used in conjuction with a close-coupled canard. The configuration tested was somewhat above the theoretical minimum drag due to lift because of the sharp leading edge on the biconvex airfoil used on the wing and canard. An effort to design a new configuration which will approach the minimum drag due to lift while maintaining high-lift configurations was completed. The resulting model will incorporate a realistic planform, airfoil section, and twist for a transonic maneuvering configuration.
    Keywords: AIRCRAFT DESIGN, TESTING AND PERFORMANCE
    Type: NASA-TM-X-74010
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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