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True wind (V T) is the same everywhere in the diagram, whereas boat velocity (V B) and apparent wind (V A) vary with point of sail. Forces on sails result from movement of air that interacts with sails and gives them motive power for sailing craft, including sailing ships, sailboats, windsurfers, ice boats, and sail-powered land vehicles.
AAW An acronym for anti-aircraft warfare. aback (of a sail) Filled by the wind on the opposite side to the one normally used to move the vessel forward.On a square-rigged ship, any of the square sails can be braced round to be aback, the purpose of which may be to reduce speed (such as when a ship-of-the-line is keeping station with others), to heave to, or to assist moving the ship's head ...
Sails are typically attached to the vessel and manipulated by sailors via a combination of mast, spars, and ropes. 2. The power harnessed by a sail or sails to propel a vessel. 3. To use sail power to propel a vessel. 4. A trip in a boat or ship, especially a sailboat or sailing ship. 5.
The forces transmitted via the sails are resisted by forces from the hull, keel, and rudder of a sailing craft, by forces from skate runners of an iceboat, or by forces from wheels of a land sailing craft which are steering the course. This combination of forces means that it is possible to sail an upwind course as well as downwind.
Ahull: with sails furled and helm lashed alee. [4] Alee: on or toward the lee (the downwind side). [5] Aloft: the stacks, masts, rigging, or other area above the highest solid structure. [1] Amidships: near the middle part of a ship. [1] Aport: toward the port side of a ship (opposite of "astarboard"). [6] Ashore: on or towards the shore or ...
Sails may be made from a combination of woven materials—including canvas or polyester cloth, laminated membranes or bonded filaments, usually in a three- or four-sided shape. A sail provides propulsive force via a combination of lift and drag, depending on its angle of attack, its angle with respect to the apparent wind. Apparent wind is the ...
Sailing into the wind is a sailing expression that refers to a sail boat's ability to move forward despite being headed into (or very nearly into) the wind. A sailboat cannot make headway by sailing directly into the wind (see "Discussion," below); the point of sail into the wind is called "close hauled".
Weather helm is the result of a leeward and aft shift of a vessel's vector center of effort (the direction to which the force generated by the sails is pushing). This shift is caused by excess pressure on the mainsail , which overpowers the windward lateral resistance generated by the jib (or other head sail) and keel or centerboard.