How does the Shoalsailer achieve such good performance sailing to windward with such shallow draft?
The totally unique hull shape of the U.S. patented Shoalsailer provides stability through its beam, and achieves lift to weather by the accelerated laminar flow of water rushing past the leeward side of the hull. The fine entry of the Shoalsailer’s bow helps define the direction of the water as it moves under the hull. Per the Bernoulli Principle, a sausage-shaped torpedo of aerated water is moved along the keel. This vortex of aerated water pressing against the hull and long shallow keel resists the leeway pressure on the hull created by the sails.
