Abstract
In the previous paper, authors point out that turning motion of CPP (Controllable Pitch Propeller) ship during her stopping maneuver seems to be less stable than that of FPP (Fixed Pitch Propeller) ship. Stopping test are carried out for various J_<so> (=U_o/(n・P)) to investigate the characteristics of turning motion of CPP ship under calm condition and under windy condition. The test ship is 5, 884 G. T. with a single CPP and has a direct reversing device for her diesel engine as well. And following characteristics are pointed out. (1) In case of calm condition, turning motion of the test ship in CPP mode is not stable, she always turns her head to windward, but in FPP mode, she turns her head to starboard steadily. It seems that there are some difference of the hydrodynamic forces between CPP and FPP on stopping maneuver. And further model tests are desired to investigate these characteristics of CPP. (2) In case of windy condition, degree of turning motion in the CPP mode in beam wind is bigger than that in head wind and following wind and that increases in proportion to |J_<so>|. Stopping maneuver of a single CPP ship in harbor, it is therefore recommended, in order to reduce her turning motion, to proceed toward the wind with minimum ahead pitch and to apply a little higher reversing pitch directly without pitch zero operation.
