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Sail plan of a brig. A sail plan is a drawing of a sailing craft, viewed from the side, depicting its sails, the spars that carry them and some of the rigging that supports the rig. [1] By extension, "sail plan" describes the arrangement of sails on a craft. [2] [3] A sailing craft may be waterborne (a ship or boat), an iceboat, or a sail ...
Each form of rig requires its own type of sails. Among them are: A staysail (pronounced stays'l) is a fore-and-aft sail whose leading edge is hanked to a stay. A headsail is any sail forward of the foremost mast on a sailing boat. It is usually a fore-and-aft sail, but on older sailing ships would include a square-sail on a bowsprit. [11]
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.
Hull form lines, lengthwise and in cross-section from a 1781 plan. Hull shapes for sailing ships evolved from being relatively short and blunt to being longer and finer at the bow. [36] [obsolete source] By the nineteenth century, ships were built with reference to a half model, made from wooden layers that were pinned together. Each layer ...
The sail plan of the Searunner 31 typically includes a main sail, jib, and sometimes a spinnaker. The trimaran configuration allows for efficient sailing in a wide range of wind conditions, with the ability to achieve higher speeds than monohull designs. One of the notable characteristics of the Searunner 31 is its folding mechanism.
For thousands of years ship designers and builders of sailing vessels used rules of thumb based on the midship-section area to size the sails for a given vessel. The hull form and sail plan for the clipper ships, for example, evolved from experience, not from theory. It was not until the advent of steam power and the construction of large iron ...
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The hull shape and sail plan are tightly controlled, while the spars, foils and rigging are more open which allows the boat's rig and controls to be set up to the preferences of the crew, rather than dictated by the class rules.