Longitudinal control of a hang glider by weight shift is not always adequate for recovery from a vertical dive. According to Lanchester's phugoid theory, recovery from rest to horizontal flight ought to be possible within a distance equal to three times the height of fall needed to acquire level flight velocity. A hang glider, having a wing loading of 5 kg sq m and capable of developing a lift coefficient of 1.0, should recover to horizontal flight within a vertical distance of about 12 m. The minimum recovery distance can be closely approached if the glider is equipped with a small all-moveable tail surface having sufficient upward deflection.


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    Title :

    Dynamics of Ultralight Aircraft: Dive Recovery of Hang Gliders


    Contributors:
    R. T. Jones (author)

    Publication date :

    1977


    Size :

    15 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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