Several reports have been written on the performance of the Quiet Short-Haul Research Aircraft, which shows the advantages of upper-surface blowing or the propulsive-lift wing as it applies to lift, maneuverability, and short takeoff and landing. This high lift generation at low speeds results in substantial downwash, especially in the low-aft fuselage tail position. The high T-tail of the Quiet Short-Haul Research Aircraft minimizes the undesirable downwash effects from the propulsive-lift wing. Queries from Department of Defense agencies and industry for quantitative values prompted a series of flight-measured downwash tests at the high T-tail and the low aft fuselage position. The results are presented in a summarized format, showing downwash, Delta epsilon/Delta a, for both locations. As would be expected, downwash increases for increased power and USB flap settings. The downwash is greater in the low aft-fuselage position as compared to the high T-tail area.


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    Title :

    Flight Measured Downwash of the QSRA (Quiet Short-Haul Research Aircraft)


    Contributors:
    J. C. Eppel (author) / D. W. Riddle (author) / V. C. Stevens (author)

    Publication date :

    1988


    Size :

    13 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





    Flight measured downwash of QSRA

    Eppel, Joseph C. / Riddle, Dennis W. / Stevens, Victor C. | NTRS | 1988