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Course made good (C.M.G. or Course Over Ground) - the actual route taken to achieve the journey's objecting measured over the ground. It is the resultant of the course steered and the effect on that course of any wind and tide. Sail trim - pulling the sail in when sailing upwind and letting it out when sailing downwind.
Filled with wind, the sail has a roughly spherical polygon shape and if the shape is stable, then the location of centre of effort is stable. On sailing craft with multiple sails, the position of centre of effort varies with the sail plan. Sail trim or airfoil profile, boat trim and point of sail also affect CE.
A sailing craft is said to be sailing close-hauled when its sails are trimmed in tightly and are acting substantially like a wing, relying on lift to propel the craft forward on a course as close to the wind as the sail can provide lift. This point of sail lets the sailing craft travel upwind, diagonally to the wind direction. [4]
The physics of sailing arises from a balance of forces between the wind powering the sailing craft as it passes over its sails and the resistance by the sailing craft against being blown off course, which is provided in the water by the keel, rudder, underwater foils and other elements of the underbody of a sailboat, on ice by the runners of an ...
This motion is generated directly either by the water and wind motion, particularly lateral wave motion, exerting forces against the hull or by the ship's own propulsion; or indirectly by the inertia of the ship while turning. This movement can be compared to the vessel's lateral drift from its course.
The Washington Sailing Marina is located in Daingerfield Island, Alexandria, Virginia (United States), on the Potomac River.It hosts the Potomac River Sailing Association, Daingerfield Island Sailing Fleet, Sailing Club of Washington, Georgetown University Sailing Team and George Washington University Sailing Team.
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Training is more formal in the merchant navy and naval forces, but still covers the basics of traditional seamanship. Smaller vessel types may have traditional methods of seamanships unique to their vessel types, for example turtling on dinghies and small sailing boats. Boatwork is a traditional seamanship skill. [26]
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