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Boat with rotatable wheel keel for resistance to leeward movement in water and for sand transport
Boat with rotatable wheel keel for resistance to leeward movement in water and for sand transport
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机译：带有可旋转轮龙骨的船，可抵抗水中的下风运动和沙土运输
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摘要
A rotatable wheel is mounted under a sailboat or other boat and shaped in a manner such that it will be efficient in developing a hydrodynamic lifting force to function as the boat's primary keel to resist leeway and provide directional stability. The wheel or wheels can also be used to ramp launch or haul the boat and to roll the boat about on land. In order to reduce hydrodynamic drag, a tire fitted onto the wheel forms a continuous and fair surface with the wheel wall.
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