| 摘要 |
PROBLEM TO BE SOLVED: To provide a hydrofoil device for a sail board capable of keeping a direction due to forward and backward swing of a sail while running at fixed height by a fully-submerged hydrofoil to enable free steering and reducing resistance greatly more than a conventional sail board in a wind velocity zone because this device has a combination of a small front blade for adjusting angle of attack by a small sensor and a fixed type main blade to achieve overwhelming speed. SOLUTION: This sail board allows turn of a strut supporting the front blade to proper extent that it faces the direction of water stream to ensure free yaw control by the sail peculiar to the sail board and realize ease of riding together by several auxiliary means. On the other hand, the front blade having small distribution of weight is moved by a small water surface sensor to keep floating height automatically, and the main blade fixed to the stern supports most of remaining weight to reduce all resistance and improve riding comfortableness. COPYRIGHT: (C)2006,JPO&NCIPI
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