| 摘要 |
PROBLEM TO BE SOLVED: To provide a fin mechanism capable of restraining turning round moment by changing the area of a fin according to the condition of a hull and decreasing the distance between the lateral water pressure center and the center of gravity. SOLUTION: A fin mechanism 1 is provided with a fixed fin 2 provided on the bottom so that lateral water pressure central position may be close to the center of gravity of a hull S in order to stabilize the course of the hull S, a moving fin 3 for changing the total area to the fixed fin 2 by being vertically moved in relation to the fixed fin 2, and a moving mechanism for vertically moving the moving fin 3.
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