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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 ...
Helm force (rotation about the vertical axis) Hull drag (rotation about the horizontal axis amidships [citation needed]) Each is a reaction to forces on sails and is achieved either by weight distribution or by management of the center of force of the underwater foils (keel, daggerboard, etc.), compared with the center of force on the sails.
The ship is propelled, at least in part, by large powered vertical rotors, sometimes known as rotor sails. German engineer Anton Flettner was the first to build a ship that attempted to tap this force for propulsion. "The idea worked, but the propulsion force generated was less than the motor would have generated if it had been connected to a ...
Ahull: with sails furled and helm lashed alee. [5] Alee: on or toward the lee (the downwind side). [6] 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"). [7] Ashore: on or toward the shore or land ...
The tilting rotation of a vessel about its longitudinal/X (front-back or bow-stern) axis. An offset or deviation from normal on this axis is referred to as list or heel. Heel refers to an offset that is intentional or expected, as caused by wind pressure on sails, turning, or other crew actions.
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.
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 ...