船の旋囘性に就て

概要

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As the turning properties of ships are usually discussed only from the experiences and impressions of those who handle ships, the author analysed the problem by experimental investigations, and found the principle that, within a limit of the angular velocity of usual ships in turning, where the turning resistance is proportional to the square of the angular velocity, the turning angle from rest to a point where the angular velocity becomes constant is 1 radian, if a ship is turned about its axis by constant turning moment. Therefore, the turning moment of a ship is equal to the sum of the kinetic energy of the ship due to its mass and moment of resistance of ship-form due to the water mass. With ship-models and a ship the following experimental investigations were conducted : - 1. The points where the angular velocity and speed of the ship become constant after putting the helm over to some angle. 2. The point where the angular velocity of the ship becomes zero after the helm in turning is put back to zero. 3. Turning angles where the angular velocity in turning becomes zero and then constant, after the helm is put over to sone angle in the reverse direction.
社団法人日本船舶海洋工学会の論文