公开(公告)号：US5746631A

公开(公告)日：1998-05-05

申请号：US583973

申请日：1996-01-11

申请人： Peter T. McCarthy

发明人： Peter T. McCarthy

IPC分类号： A63B31/11 ,  B63B1/24 ,  B63H1/26 ,  B63H1/36 ,  B63H16/04 ,  B63H25/38 ,  A63B31/08

CPC分类号： B63H1/36 ,  A63B31/11 ,  B63B1/248 ,  B63B2039/063 ,  B63H1/26 ,  B63H16/04 ,  B63H25/382

摘要： Methods are disclosed for increasing lift and decreasing drag on hydrofoils and swim fins. These methods include providing a hydrofoil with a highly swept back leading edge portion and orienting the hydrofoil at a significantly reduced angle of attack in which the reduced angle of attack occurs at an angle that is substantially transverse to the hydrofoil's direction of movement through a surrounding fluid medium. The lee surfaces of the hydrofoil are provided with a substantially unobstructed flow path as well as a separation reducing contour so as to permit lift generating attached flow conditions to form along such lee surfaces. Substantially rigid structural reinforcement is provided to prevent the hydrofoil from deforming significantly during use. Methods are disclosed for providing a hydrofoil with a substantially longitudinal recess or venting system located substantially along the center axis of the hydrofoil. The attacking surfaces of such a hydrofoil are provided with an anhedral contour that forms a substantially lengthwise channel with the recess or venting means located along the center axis of this lengthwise channel. Methods are disclosed for applying these lift generating and drag reducing methods to both non-flexible and flexible hydrofoil blades that are used in reciprocating propulsion strokes through a fluid medium. Also provided are methods for significantly controlling and reducing the build up of torsional stress forces within a flexible hydrofoil as it is encouraged to twist to a reduced angle of attack during use.

摘要翻译： 公开了用于增加水翼和水翼上的牵引力和减小阻力的方法。 这些方法包括提供具有高度扫掠的前缘部分的水翼并且以明显减小的迎角定向水翼，其中减小的迎角发生在基本上横向于水翼通过周围流体的移动方向的角度 中。 水翼的e面具有基本上无障碍的流动路径以及分离减小轮廓，以便允许提升产生附着的流动条件以沿这样的e面形成。 提供基本刚性的结构加固件，以防止水翼在使用过程中发生明显的变形。 公开了用于提供具有基本上沿着水翼的中心轴线定位的基本上纵向的凹部或排气系统的水翼的方法。 这种水翼的攻击表面设置有形成基本纵向通道的四面体轮廓，凹部或排气装置沿着该纵向通道的中心轴线定位。 公开了将这些提升产生和减阻方法应用于通过流体介质的往复推进冲程中使用的非柔性和柔性水翼叶片的方法。 还提供了用于在柔性水翼中显着控制和减少扭转应力的累积的方法，因为它被鼓励在使用期间扭转成减小的迎角。

公开(公告)号：US5480331A

公开(公告)日：1996-01-02

申请号：US425034

申请日：1995-04-17

申请人： Tommy R. Lewis

发明人： Tommy R. Lewis

IPC分类号： B29D99/00 ,  B63B35/79 ,  B63B1/00

CPC分类号： B29D99/0025 ,  B63B35/7926 ,  B63B2039/063

摘要： A flexible fin for surfboards, sailboards and other watercraft comprises a thin core sheet made of laminated fiberglass sandwiched between two slabs of closed-cell polyurethane foam. The flexible fin provides for sharper turns while increasing the buoyancy of the craft.

摘要翻译： 用于冲浪板，帆板和其他船只的柔性翅片包括夹在两片闭孔聚氨酯泡沫之间的由夹层玻璃纤维制成的薄芯片。 柔性翅片提供更尖锐的转弯，同时增加了工艺的浮力。