PCT No. PCT/AU95/00143 Sec. 371 Date Dec. 16, 1996 Sec. 102(e) Date Dec. 16, 1996 PCT Filed Mar. 17, 1995 PCT Pub. No. WO95/25663 PCT Pub. Date Sep. 28, 1995A yacht (10) includes a mast (12) that is mechanically connected to a keel (14) via a bearing (16), located in the base of hull (18) of the yacht (10). A sail foil (30) is pivotally mounted to the top of the mast (12) via a rotating bearing (34). In use, as the wind forces the sail foil (30) and mast (12) to leeward, a corresponding movement to windward is induced in the keel (14) and thus the yacht's hull (18) can remain substantially horizontal with respect to surrounding flat water.
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