The greater lift / less leeway of fin keels is due to them having more leading edge.
The leeway advantage of the fin keel is also related to the speed. For instance, even if two boats had the same leeway speed, if the full keel is doing 4 kts with 0.1 kts leeway, then over a 24 kt course it will be 0.6 kts downwind. If a fin keel is doing 6 kts with 0.1 kts leeway over the same course, it will be 0.4 kts downwind.
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Last edited by CapnHand; 11-13-2007 at 12:57 PM.