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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.
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.
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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 ...
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.
The mast will come to a sudden stop when the vessel returns to near upright when the wind fills the sails again. The problem is the mass of the mast still has momentum. Multi-hulls don't suffer g-forces caused by the wind to the same degree. Instead they are far more susceptible to g-force load owing to wave action.
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.
Any sail experiences a force from the prevailing wind just because it impedes the air's passage. A sail with draft also functions as an airfoil when set at an angle slightly greater than the angle of the wind, producing lift which then propels the vessel. [1] The word "belly" is also used in reference to the draft of a sail (i.e.