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A sailboat having a hull, a sail assembly and a keel. The keel is shaped as a longitudinally and horizontally extending hydrofoil which developes a vertically downward force. When the boat is traveling in a heeled position, the keel member exerts a downwardly and outwardly directed keel force having

A sailboat having a hull, a sail assembly and a keel. The keel is shaped as a longitudinally and horizontally extending hydrofoil which developes a vertically downward force. When the boat is traveling in a heeled position, the keel member exerts a downwardly and outwardly directed keel force having a lateral force component to substantially counteract an opposite lateral aerodynamic force component exerted by wind against the sail assembly, thus diminishing the yaw angle in the travel of the boat. Further, the keel force acts through the center of gravity of the boat to produce a righting moment which tends to counteract the capsizing moment developed by the force of the wind against the sail assembly.

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A sailboat comprising: a. a displacement hull having front and rear ends, a longitudinal axis, a transverse horizontal axis and a vertical axis, b. a sail assembly mounted to said hull and arranged to be able to be positioned relative to wind which is blowing at an angle to the longitudinal axis of

A sailboat comprising: a. a displacement hull having front and rear ends, a longitudinal axis, a transverse horizontal axis and a vertical axis, b. a sail assembly mounted to said hull and arranged to be able to be positioned relative to wind which is blowing at an angle to the longitudinal axis of the hull so that the sail develops an aerodynamic force within a predetermined force range, said aerodynamic force having a lateral aerodynamic force component and a forward aerodynamic force component, c. a keel member mounted beneath said hull, said keel member having a cordwise axis generally aligned with said longitudinal axis and a spanwise axis generally aligned with said transverse horizontal axis, d. said keel member being hydrodynamically contoured so that with the boat moving forwardly through water, said keel member produces a downward hydrodynamically created force having a substantial force component generally aligned with said vertical axis, and tending to increase the effective displacement of said hull, e. said keel member being positioned, sized and contoured relative to said sail assembly, so that with said boat in a heeled position and travelling forwardly with a small yaw angle, said keel member develops a downwardly and laterally direct keel force with both vertical and lateral keel force components, said keel force being of a magnitude that the lateral keel force component substantially counteracts the lateral aerodynamic force component, whereby with said boat travelling with its longitudinal axis at an angle to the wind, said keel member is able to generate its hydrodynamic force simply by virtue of forward movement of the boat, without necessity of the boat travelling at a substantial yaw angle, with the result that the hydrodynamic lateral force component is able to substantially counteract the lateral aerodynamic force component in a manner to substantially diminish yaw angle in the forward travel of the boat.