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Old 15th June 2011, 02:36 PM   #7
Farlo
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Join Date: Aug 2006
Posts: 527
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Thank you all. There is probably a relation with wetted area as Belskorpio says, although I would think that the larger surface has more grip/drag whatever the pressure (static or dynamic). The analogy with a blade suggest that the narrow board will resist more with its leeward rail, until it reaches a certain speed. Once fully planing, a few more knots may explain that you get similar lift from a smaller fin, while the sideways force of the sail does not increase in proportion.

Ken, I also found the selector pretty useful so far (but I use mostly Select fins).
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