旋回中の船に働く見掛の力と旋回初期運動について

概要

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It has been believed that when a ship is steered, it will at first drift outward considerably, and then drawing the figure of an "S", cut the original course and will turn gradually inward as is shown in fig.5 A.l.In fact, according to results of turning trials of actual ships, some of them drift outward as much as one-third of their length, and a majority of them seem to drift outward to a considerable amount.On the other hand, accoring to records of the "Turning course recorder" or results of model experiments, it will be noticed, that there is no "drifting out" or such slight "drfting out" that ships seem to deviate tangentially from their original courses.The Author has investigated into the difference between the results of turning trials of actual ships and that of model ships both theoretically and experimentally, and describes in this paper that the amount of "drifting out" is so small that it does not exceed one per-cent of the ship's length, and he mentions that the present method of measuring the ship's turning path on the turning trial is not sufficiently accurate.The Author also proposes a method of obtainig more accurate turning path of actual ships.
社団法人日本船舶海洋工学会の論文