Abstract
To utilize the energy of the rotation, existing in the slip stream behind a ship, the reaction rudder has been used commonly. But it seems that there is no reasonable method of designing this rudder. To improve the propulsive efficiency of single-screw ship still more, we investigated the action of the reaction rudder, and obtained a theoretical method of determining the chief character of this rudderRelating to this investigation we measured the distribution of the direction and velocity of the slip stream behind a ship model at a self-propelled condition, and as a example, by means of the above-mentioned method, the optimum reaction rudder is designed for that condition.
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