Sailing - Sailing Hulls and Hull Shapes

Sailing Hulls and Hull Shapes

Further information: Hull (watercraft)

Sailing boats with one hull are "monohulls", those with two are "catamarans", those with three are "trimarans". A boat is turned by a rudder, which itself is controlled by a tiller or a wheel, while at the same time adjusting the sheeting angle of the sails. Smaller sailing boats often have a stabilising, raisable, underwater fin called a centreboard, daggerboard, or leeboard; larger sailing boats have a fixed (or sometimes canting) keel. As a general rule, the former are called dinghies, the latter keelboats. However, up until the adoption of the Racing Rules of Sailing, any vessel racing under sail was considered a yacht, be it a multi-masted ship-rigged vessel (such as a sailing frigate), a sailboard (more commonly referred to as a windsurfer) or remote-controlled boat, or anything in between. (See Dinghy sailing.)

Multihulls use flotation and/or weight positioned away from the centre line of the sailboat to counter the force of the wind. This is in contrast to heavy ballast that can account for up to 90% (in extreme cases like AC boats) of the weight of a monohull sailboat. In the case of a standard catamaran there are two similarly-sized and -shaped slender hulls connected by beams, which are sometimes overlaid by a deck superstructure. Another catamaran variation is the proa. In the case of trimarans, which have an unballasted centre hull similar to a monohull, two smaller amas are situated parallel to the centre hull to resist the sideways force of the wind. The advantage of multihulled sailboats is that they do not suffer the performance penalty of having to carry heavy ballast, and their relatively lesser draft reduces the amount of drag, caused by friction and inertia, when moving through the water.

One of the most common dinghy hulls in the world is the Laser hull. It was designed by Bruce Kirby in 1971 and unveiled at the New York boat show (1971) It was designed with speed and simplicity in mind. The Laser is 13 feet 10.5 inches long and a 12.5 foot water line and 76 square feet (7.1 m2) of sail.

Read more about this topic:  Sailing

Famous quotes containing the words sailing, hulls and/or shapes:

    O western orb sailing the heaven,
    Now I know what you must have meant as a month since I walked,
    As I walked in silence the transparent shadowy night,
    Walt Whitman (1819–1892)

    To anybody who can hold the Present at its worth without being inappreciative of the Past, it may be forgiven, if to such an one the solitary old hulk at Portsmouth, Nelson’s Victory, seems to float there, not alone as the decaying monument of a fame incorruptible, but also as a poetic approach, softened by its picturesqueness, to the Monitors and yet mightier hulls of the European ironclads.
    Herman Melville (1819–1891)

    Incarnate devil in a talking snake,
    The central plains of Asia in his garden,
    In shaping-time the circle stung awake,
    In shapes of sin forked out the bearded apple....
    Dylan Thomas (1914–1953)