Abstract
This report provides results of model experiments concerning hydrodynamic forces on the rudder of a ship equipped with controllable pitch propeller(CCP). Captive model tests were performed under condition of steady straight course. In this test, rudder normal force and propeller thrust were measured by changing advance speed of a ship, CPP blade angle, and rudder angle systematically. By using these experimental results, characteristics of inflow velocity to rudder behind CPP is examined on the basis of the momentum theory for a actuator disc. Here, state of flow around rudder is classified into three regions, considering whether the momentum theory may be applied or not. The correction factor which appears in the formula of expressing the inflow velocity is assumed to be applied in the wide range of CPP blade angle. The factor, which gives added velocity due to the propeller at the rudder position, is evaluated by applying the experimental results mentioned above. As a result, it is indicated that values of the factor lie almost between 1.0 and 2.0. Moreover, it is found that generally speaking the factor gives different values for different regions of the flow states.
