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Apparent wind velocity provides the motive power for the sails on any given point of sail. The apparent wind is equal to the true wind velocity for a stopped craft; it may be faster than the true wind speed on some points of sail, or it may be slower e.g. when a sailing craft sails dead downwind. [18]
All sailing craft reach a constant forward speed (V B) for a given wind speed (V T) and point of sail, when the forward driving force (F R) equals the forward resisting force (R l). [8] For an ice boat, the dominant forward resisting force is aerodynamic, since the coefficient of friction on smooth ice is as low as 0.02.
Velocity made good, or VMG, is a term used in sailing, especially in yacht racing, indicating the speed of a sailboat towards (or from) the direction of the wind. [1] [2] The concept is useful because a sailboat cannot sail directly upwind, and thus often can not, or should not, sail directly to a mark to reach it as quickly as possible.
In 2009, hydrofoil trimaran, Hydroptère, set the world speed sailing record on water at 50.17 knots (92.9 km/h), sailing at about 1.7 times the speed of the wind. [17] [18] In late 2012, Vestas Sailrocket 2 achieved a new outright world speed record of 65.45 knots (121.2 km/h) on water, at around 2.5 times the speed of the wind. [19]
All sailing craft reach a constant forward velocity (V B) for a given true wind velocity (V T) and point of sail. The craft's point of sail affects its velocity for a given true wind velocity. Conventional sailing craft cannot derive power from the wind in a "no-go" zone that is approximately 40° to 50° away from the true wind, depending on ...
Increasing speed of the sailing craft brings the apparent wind progressively forward for points of sail where the sail can act like an airfoil (typically 45 to 135 degrees off the true wind) and the craft's speed can exceed that of the wind, rather than a parachute (typically 135 to 180 degrees off the true wind) when the speed of the sailing ...
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An apparent wind indicator, as found on sailboat, is a small weather vane or arrow that gives an indication of the current apparent wind direction. This indication allows the skipper to set their sails or their course for best performance, according to the points of sail.
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