| 摘要 |
An aerofoil sail has a rigid main panel (10) pivotally mounted to a hull (17) about a vertical axis (15) with trailing a flap (12A) hinged (14) to one side of the main panel. The trailing flap comprises a series of separate flaps (12A' ,12A'' ,12A''') individually settable so that the angle of incidence can differ ( alpha , beta ) at different levels on the sail. Alternatively, a single trailing flap can be torsionally flexible so that the angle of incidence can differ along its length. In a preferred form flaps (12A,12B) are provided at opposite edges of main panel (10) and can be alternatively folded in to give a reversible aerofoil section.
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