CPP 1軸1舵船におけるミニマムアヘッドピッチによる操船法の提案

概要

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An additional yaw moment is exerted under propeller pitch zero operation during coasting maneuver of CPP ships, which introduces a significant reduction in maneuverability. In order to improve the maneuverability of CPP ships at coasting, the authors propose the use of Minimum Ahead Pitch (MHP) of CPP. MHP is the smallest blade angle of CPP at forward pitch which ensures adequate steerage. Using a 5, 884 G.T. training ship with a single CPP, single flap rudder and bow thruster, full-scale experiments were conducted to confirm the effectiveness of MHP operation in coasting maneuver and to investigate its optimal application for anchoring and undocking. The results led to the following conclusions : (1) CPP ships under coasting using MHP are controllable by steering, making it possible to keep the planned course. (2) Transverse moving maneuver for undocking becomes possible by the use of MHP with a high-lift rudder and bow thruster. (3) For ships with a single-CPP and single-rudder, MHP operation improves the maneuverability in coasting, anchoring and undocking.
2005-03-25