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Center of pressure is used in sailboat design to represent the position on a sail where the aerodynamic force is concentrated.. The relationship of the aerodynamic center of pressure on the sails to the hydrodynamic center of pressure (referred to as the center of lateral resistance) on the hull determines the behavior of the boat in the wind.
The center of lateral resistance is the center of pressure of the hydrodynamic forces on the hull of a boat.The center of pressure is the point on a body where the total sum of a pressure field acts, causing a force and no moment about that point.
Whereas ice boats and land-sailing craft resist lateral forces with their wide stance and high-friction contact with the surface, sailboats travel through water, which provides limited resistance to side forces. In a sailboat, side forces are resisted in two ways: [8] Leeway: Leeway is the rate of travel perpendicular to the course.
In a boat, the equivalent of the spring stiffness is the distance called "GM" or "metacentric height", being the distance between two points: "G" the centre of gravity of the boat and "M", which is a point called the metacentre. Metacentre is determined by the ratio between the inertia resistance of the boat and the volume of the boat. (The ...
The fundamental cause of "helm", be it weather or lee, is the differential between the center of effort of the sail plan to the center of lateral resistance of the hull. If the center of pressure is astern of the center of lateral resistance, a weather helm, the tendency of the vessel to want to turn into the wind, or to weather-vane, will result.
Ship stability illustration explaining the stable and unstable dynamics of buoyancy (B), center of buoyancy (CB), center of gravity (CG), and weight (W) Ship stability is an area of naval architecture and ship design that deals with how a ship behaves at sea, both in still water and in waves, whether intact or damaged.
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The cause of lee helm is that the center of pressure exerted by the wind on the sails falls too far forward of the center of resistance of the hull — the natural point at which the hull tries to pivot. This tends to push the bow of the boat away from the wind. This can be due to a poor design, for example with the mast too far forward.