Some surf-oriented designs have these chines pr "rails". I think I've seen a wave ski like this in the rear and some white water kayaks lately have similar rear ends too.
Will be interesting to see how it works on a sea kayak. Probably best in surf, but as you say, maybe helpful for flat water turns too...
Cartop Kayak Carriers
Overstock Outlet Foods
Touring Kayak Paddles
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