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up and down within its casing, changing the area of the board exposed to the water. When the board starts at its maximum height above the water, it is near vertical and employs a lifting force normal to the exposed surface or otherwise horizontal lift. As the board is pushed lower, the 'C' shape forces a larger portion of the board to become horizontal, introducing a larger vertical component in the lift. This variation in configuration allows for many boats to provide a higher upwind angle due to the horizontal lift in combination to the vertical

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