| 摘要 |
PROBLEM TO BE SOLVED: To provide a rudder with simple rudder structure and high in maintainability, positively increasing a rudder force without significant turbulence in a flow around the rudder in turning. SOLUTION: The rudder comprises: a main body rudder 11 rotatably attached to a hull; a movable rudder 12 capable of ejecting/retracting from/to a rear end of the main body ruder 11; and a movable mechanism ejecting/retracting the movable rudder 12 from/to the main body rudder 11 to change a rudder area to be wide/narrow. Rudder resistance is reduced when the movable rudder 12 is housed in the main body rudder 11 in straight advancing, and the rudder force is increased by projecting the movable ruder 12 from the main body rudder 11 even in turning in low speed navigation, by just ejecting/retracting the movable rudder 12 from/to the main body rudder 11. Therefore, the structure of the rudder 10 can be simplified. COPYRIGHT: (C)2007,JPO&INPIT
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