The fastest deep water paddlecraft, ICF Sprint boats have soft chines and long recoveries, with copious rocker fore and aft.
Some shallow water racers, USCA Cruiser type craft, have hard chines aft to keep waves away from the hull. Look at the GRB/ Newman Design website.
Hard chines increase initial stability by placing volume wider but hard chines hulls heel unpredictably which can pitch one into the drink suddenly.
The Kayak Wing
URCHIN Portable Anchor
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