Wind Tunnel Experiments on T.S. Oshoro Maru

Abstract

In order to investigate the safety and manoeuverability of a ship, it is necessary to clarify the effects of wind on them. The wind tunnel experiments were carried out with an image model of above and under-water portions of the training ship Oshoro Maru, changing the direction of wind relative to the model over the whole ranges. The forces acting on them were respectively measured. In the first half part of this paper, there are given the results of them as shown in Figs.2, 3, 4, 5 and 6. A ship may be said to hold manoeuverability when she is fully possible to turn to both sides. Manoeuverability become impossible at high ratio (wind velocity/ship's speed), viz. at higher wind velosity as compared with ship's speed. In the latter half part, the motion of Oshoro Maru under strong wind was analyzed using the above experimental data, and the range where she is manoeuverable, and those where she turns both windward and leeward are respectively obtained as shown in Fig.8.