The powered high lift device of the ASKA, the NAL Short Take Off and Landing (STOL) experimental aircraft, is an Upper Surface Blowing (USB) device that forces the jet exhaust flow downward, thus producing higher lift due to the Coanda effect. Three pieces of equipment were incorporated that enhanced the USB high lift generation: Boundary Layer Control (BLC), drooped ailerons, and vortex generations. The aerodynamic effects of these equipment are described based on flight test data. In early flight test stages, a shallow ASKA USB flap configuration encountered buffeting, beginning at a lower angle of attack than expected, thereby limiting the flight envelope. Based on the wind tunnel test surveys, a nacelle fence and drooped leading edge were subsequently installed to delay the buffet onset. The effect of these devices is also discussed based on flight test results.


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    Title :

    Evaluation of High Lift Devices of the Quiet STOL Experimental Aircraft ASKA


    Contributors:
    T. Bandou (author)

    Publication date :

    1991


    Size :

    33 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English