I don't know anyone who has them no, but ski race boats have used that idea for years, and it isn't really any different to a regular tab in principle, it just has the added advantage that instead of a nasty hinged corner at the transition from hull running surface to tab control surface, which can't be good for flow, it sweeps into the control surface, almost like changing the actual shape of the aft running surface. much more efficient I would have thought, ie, more lift from the tab with less drag.
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"I Agree with everything you say really!" - John Cooke to Jon Fuller - 26-01-2013
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