Experiments on the Mutual Action between Propeller and Rudder

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By the measuring apparatus specially designed for the rudder resistance, as shown in Fig. 1, the resistances of the rudder plate, single plate rudder and reaction rudder, all shown in Fig. 2, were measured in both open water and propeller race. These results, presented in Fig. 12, show that the presence of the propeller increases the resistances of the rudder plate and single plate rudder, but decreases that of the reaction rudder to the extent of the negative resistance at the higher slip ratio.<BR>By the propeller dynamometer the thrust and torque of the propeller, shown in Fig. 4, were measured in both open water and front of the rudder. These results, presented in Fig. 11, show that the presence of the rudder increases the thrust and efficiency of the propeller.<BR>Analysing the results of the self-propulsion tests on the high speed single screw cargo ship model, shown in Fig. 13, with and without the rudders, the similar results were obtained.
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