Abstract
A ship-generated waves, i.e., ship-waves, may very possibly be caused the capsizing or beamends to a small boat with poor stability. In this paper authors deal with some problems on the strong rolling of a boat in ship-waves from a viewpoint of manoeuvring. Main experimental results from model tests and actual ship tests are as follows, (1) The effect of ship-waves on the strong rolling of a boat is more of the divergent wave than the transevere wave, and the clear relations are observed between the magnitude of these wave height and the speed, boat-clearance, block coefficient of a sailing vessel. (2) The strongest rolling of a boat in the ship-waves causes in case that a boat is set on the direction line of cross angles 30°〜45° to the sailing line of a vessel. This result agrees approximately with the result of actual ship test. (3) When the head of a small ship with very lower freeboard and poor stability is set on the direction line of cross angles 60°〜90° to the sailing line of a vessel, the small ship get into quite frequently the beam-ends.
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