The ground-effect problems of loss of thrust and fountain-effect instabilities are quantified. Experiments to control and augment ground-effect lift and stability are presented, including jet momentum reflection and fountain redirection using various types of internal and external underbody ventral strakes. By strategically designing the vertical takeoff and landing (VTOL) ventral surface, reflection of the impinging fountain momentum is possible so that instead of losing 10% thrust while in ground-effect, remarkably, thrust is augmented 10% or more to a considerable height above the ground, in addition to stabilizing random pitch and roll moments caused by fountain instability.


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    Title :

    Vertical Takeoff and Landing Aircraft, Vertical Takeoff and Landing Ground Effects


    Additional title:

    Sae Int. J. Aerosp


    Contributors:

    Published in:

    Publication date :

    2020-08-20


    Size :

    11 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English