| 摘要 |
PROBLEM TO BE SOLVED: To change a turning characteristic, and to quickly perform sudden turning in beautiful behavior. SOLUTION: A front fin 15 sinking in the water when the hull 4 inclines at sudden turning time is arranged in a front side specific position of the hull 4, and a rear sponson 10 sinking in the water when the hull 4 inclines at sudden turning time is arranged in a rear side specific position of the hull 4.
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