Abstract
The behaviour of 15,000 tons displacement vessels in unidirectional irregular head- and bow seas has been determined with the aid of experiments in regular waves. With an assumed wave spectrum the heaving and pitching motions, and the power necessary to obtain a speed of 15 knots, have been calculated. The effects of changing the block coefficient, the length-draft ratio and the length-beam ratio are presented separately as a function of the ship length.
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