Longitudinal aerodynamic characteristics are one of the most important considerations in aircraft design. Using the NAL Short Take Off and Landing (STOL) experimental aircraft, ASKA, an alpha sweep method was adopted instead of using the conventional discrete method to investigate ASKA's longitudinal aerodynamic characteristics. ASKA's longitudinal aerodynamic characteristics are described based on analysis of the test results. In addition, longitudinal aerodynamic coefficients obtained from flight tests are compared with the ASKA's wind tunnel design configuration. ASKA showed a pitch up phenomena during shallow Upper Surface Blowing (USB) flap angles, and also encountered path divergence in the flaps up configuration, being a significant phenomena for a powered lift aircraft. Powered lift aircraft's lift coefficient consists of basic lift due to wing and flaps, direct jet thrust, and supercirculation. This lift build-up is described using calculation results of flight test data. The powered lift factor, a key parameter for powered lift aircraft, is also described.


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    Titel :

    Aerodynamic Characteristics Obtained from alpha Sweep Test of the Quiet STOL Experimental Aircraft ASKA


    Beteiligte:
    T. Bandou (Autor:in)

    Erscheinungsdatum :

    1991


    Format / Umfang :

    67 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch