You've never seen a fin with foils like these. The Orcas use an airfoil known as the Wortmann FX 79, a German sailplane foil. It gives these fins a convex surface on both sides, but the wide point is behind the midpoint of the foil, and there's a concave pinch just ahead of the trailing edge.
These fins have a medium outline, they are fast and also un-opinionated.. you can keep your speed and control through side-slips, between turns andin effect you get to enjoy high speed, drawn-out lines.
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