舵板の單獨實驗附件流中に於ける一二の實驗
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概要
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Several experiments with model rudders were carried out at the Naval Technical Research Institute to investigate the effects of the aspect ratio, the forms of section and periphery, and also the stream at the ship's stern on the behaviou〓 of the rudder. The author tested a series of rudder models in the water-circulating tank by measuring the horizontal and vertical forces acted on and the twisting moments on the rudder stock against the varying water velocities and helm angles, and calculated the amount of the normal pressure and the position of the centre of pressure from the quantities so measured. Besides the open experiments, the author made the turning trial in the test basin by using the self-propelled model ship fitted with some of the model rudders and investigated how the items above referred to affect the turning circle of a ship. The chief conclusions drawn are : (1) Systematic experiments of several series of model rudders with varying aspect ratios, forms of section and periphery are needed to obtain the normal pressure. (2) The position of the centre of pressure calculated from the Jossel formula is fairly accurate. (3) The effect of the stream at the ship's stern on the twisting moment must be taken into account owing to the experimental fact that there exi〓ts a great difference between the twisting moments measured in open water and those measured behind the ship. Diagrams showing clearly the results of the experiments are appended at the end of the paper.
- 社団法人日本船舶海洋工学会の論文
- 1932-04-30
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- 舵板の單獨實驗附件流中に於ける一二の實驗