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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.
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.
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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.
1. A mizzen sail is a small sail (triangular or gaff) on a ketch or yawl set abaft the mizzenmast. [2] 2. A mizzen staysail is an occasional lightweight staysail on a ketch or yawl, set forward of the mizzenmast while reaching in light to moderate airs. [2] 3. A mizzenmast is a mast on a ketch or yawl, or spritsail barge.
[26] boatwork includes knowledge and operation of different types of boat, launching procedures, recovery of boats (in normal and in heavy weather conditions), how to beach a boat if possible, the use of oars or sails, as well as basic sail theory, sail terminology and markings on sails.
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 ...
When the wind blows from the side, the Magnus effect creates a forward thrust. The most common form of rotor sail is the Flettner rotor. [4] [failed verification] The wind does not power the rotor, which is rotated by its own power source. Due to the arrangement of forces, a rotor ship is able to sail closer to the wind than a conventional ...