A vortex-lattice method is applied to planing hull forms. The geometry of the jet surfaces next to the wetted hull is estimated on the basis of the hull geometry while its sidewise extent has been found numerically applying a non-linear free-surface pressure condition in the jet region. The method is applied to practical hull forms with chines spray rails and with varying deadrise over the length of the boat. The deadrise variation has a large influence on lift and drag. For a design situation, where the total lift and centre of effort is given, the influence on the total drag is less due to change of the trim. Calculated results and experiments for resistance and trim agree well for high velocities.


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    Title :

    Effects of geometry on the steady performance of planning hulls


    Additional title:

    Einfluß der geometrischen Form auf den dynamischen Auftrieb von Knickspant-Bootskörpern


    Contributors:
    Wagner, M.K. (author) / Andersen, P. (author)

    Published in:

    Publication date :

    2003


    Size :

    10 Seiten, 14 Bilder, 2 Tabellen, 15 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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