This paper is concerned with guidance strategies for near-optimum performance in a windshear. The takeoff problem is considered with reference to flight in a vertical plane. In addition to the horizontal shear, the presence of a downdraft is assumed. A gamma guidance scheme, based on the absolute path inclination, is presented. This approach needs local information on the windshear and the downdraft. The gamma guidance scheme produces trajecories that preserve the basic properties of the optimal trajectories. The relation between the gamma guidance scheme and the acceleration guidance scheme is explored. In logic, these two guidance schemes are complementary to one another; in implementation, they yield almost identical results. Although local information on the windshear and the downdraft will be available in future aircraft, it might not be available on current aircraft. Hence, a simplified gamma guidance scheme (quick transition to horizontal flight) is presented which is useful for flight in severe windshears. The simplified gamma guidance scheme yields trajectories that are close to the optimal trajectories in severe windshears; in addition, it is easy to implement as a practical piloting technique.


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    Title :

    Gamma guidance schemes for flight in a windshear


    Contributors:
    Miele, A. (author) / Wang, T. (author) / Melvin, W. W. (author) / Bowles, R. L. (author)


    Publication date :

    1988-08-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English




    Gamma guidance schemes for flight in a windshear

    MIELE, A. / WANG, T. / MELVIN, W. W. et al. | AIAA | 1988



    Flight Instruments for Improved Windshear Protection and Guidance

    Kendall, E. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 1997