Results are presented of tests in regular and irregular waves of five models varying widely in form and proportions. Comparisons are given both among these models and with models tested in connection with other projects. It is shown that a low displacement-length ratio is a distinct advantage for reducing amplitudes of motions and, hence, for increasing speed at sea provided freeboard is adequate. The good sea performance of certain small craft with high displacement-length ratios appears to result mainly from ample freeboard and, to a lesser extent, their V-form sections.nIt is shown that a good estimate of comparative performance of models of different form and proportions in irregular head seas can be obtained by suitable non-dimensional plots of motion amplitudes in regular waves of various lengths.
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