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Encyclopedia > Hull (watercraft)

A hull is the body or frame of a ship or boat. It is a central concept in water vessels. The hull is essentially what keeps the water from entering the boat and acts as the walls and floor of the vessel. A ship is a large, usually decked watercraft. ... A boat is a watercraft, usually smaller than most ships. ... Water (from the Anglo-Saxon and Low German wæter) is a colourless, tasteless, and odourless substance that is essential to all known forms of life and is the most universal solvent. ... Vessel can refer to any of the following: Objects Vessel (French vaissel, from a rare Latin vascellum, diminuitive of vas, vase, or urn), a word of somewhat wide application for many objects, the meaning common to them being capacity to hold or contain something. ... A wall is a usually solid structure that defines and sometimes protects space. ... A hardwood floor (parquet) is a popular feature in many houses. ...

Nearly all watercraft, from small boats to the largest ships adhere to one general class of hull shapes that serve the needs of stability and efficient propulsion: horizontal cross-sections that have narrow, usually pointed, fronts (at the bow), smooth widening from the bow until roughly the middle (the beam), and often narrowing smoothly but usually significantly to the extreme end (the stern), whose width may range from a large to an insignificant fraction of the beam width. Vertical cross-sections perpendicular to the beam tend to be open on small boats, or flat-decked (with various superstructures) on large boats or on ships; below that level, they may widen to some extent, but almost always narrow smoothly to either a relatively flat bottom or to an angled joint at the center, which may feature a keel or retractable centerboard. Nevertheless, other general shapes are feasible; the coracle is a relatively extreme example, and many cargo barges, with all cross-sections close to rectangular, are a radical departure from both the coracle and the tapered hulls described above. Large ships have a bulbous bow to increase fuel efficiency. A boat is a watercraft, usually smaller than most ships. ... A ship is a large, usually decked watercraft. ... A keel is a large beam around which the hull of a ship is built. ... A centreboard is a form of removable keel on a small sailing boat or dinghy which can be removed to lower the draught (or depth) of the vessel. ... The bulbous bow of the U.S. Navy carrier USS Ronald Reagan is clearly visible in this photograph. ...

In hulls constructed from materials that are denser than water, such as steel, the hull traps a volume of air that lowers the overall density of the boat providing buoyancy so that the boat floats. Hulls constructed of materials that are less dense than water, such as some types of wood, may float even when full of water. Density (symbol: ρ - Greek: rho) is a measure of mass per unit of volume. ... In physics, buoyancy is an upward force on an object immersed in a fluid (i. ... A tree trunk as found at the Veluwe, The Netherlands Wood is a organic material found as the primary content of the stems of woody plants, especially trees, but also shrubs. ...

The very first hull is thought to have consisted of a hollowed out tree bole and was a Stone Age invention--in effect the first canoe. Hull construction then proceeded to keeled hulls, including ballast and on to modern double steel hulls with waterproof sections. The coniferous Coast Redwood, the tallest tree species on earth A tree can be defined as a large, perennial, woody plant. ... Stone Age fishing hook. ... Canoe at El Nido, Philippines A canoe is a relatively small human-powered boat. ... A keel is a large beam around which the hull of a ship is built. ... Ballast may mean: track ballast: gravel or cinders forming the railroad or railway track-bed on which sleepers (ties) and track is laid, for proper drainage ships ballast: water, sand, rocks, or bricks used to weight a ship down when it has very little cargo (though water may contain... Steel framework Steel is a metal alloy whose major component is iron, with carbon being the primary alloying material. ...

Hull construction is usually performed in a dry dock or on dry land. In the very latest sailing ships, hulls are often made of layers of foam and plastic, forming composite hulls, with a minimum of weight. Variations on the single hull can be found with outriggers, and craft with more than one hull, called multihulls. U.S. Navy submarine USS Greeneville in dry dock following collision with a fishing boat. ... The term plastics covers a range of synthetic or semi-synthetic polymerization products. ... Composite materials (or composites for short) are engineering materials made from two or more components. ... In a canoe or bangca, an outrigger is a thin, long, solid, hull used to stabilise an inherently unstable main hull. ... A multihull is a sailing ship with more than one hull. ...

Breakdown of a sailing ship
Parts of a sailing ship
Anchor | Bilgeboard | Capstan | Centreboard | Daggerboard | Deck | Figurehead | Forecastle | Gunwale | Hull | Jackline | Leeboard | Mast | Poop deck | Rudder | Ship's wheel | Stern | Tiller | Winch

  Results from FactBites:
Recreational semi-displacement hull watercraft - Patent 4660490 (6263 words)
A watercraft as in claim 1 wherein the longitudinal profile of the hull has a substantial rise in the keel line from the middle section to the bow and a smaller rise in the keel line from the middle section to the stern.
The skin friction of the hull is caused by the tendency of water to stick to the sides of a moving hull and to be dragged along with it.
The semi-displacement hulls of this invention are generally characterized by a ratio of the maximum beam of the hull to the maximum depth of the hull of 2.5:1 or greater.
The planing hull according to claim 8 further comprising a means for connecting said power source to said means for accelerating water sternward, a means for steering said planing hull and a throttle means operatively connected to said power source and controllable by an operator of said planing hull.
A watercraft as in claim 36 wherein the width of the aft portion is approximately one-half the width of the maximum width of the fore portion.
A watercraft as in claim 37 further comprising a lower hull formed continuously through the fore and aft portions configured in a V-shape and a T-shaped planing surface formed of the lower hull portion of the aft portion and the lower hull portion at the point of maximum width of the fore portion.
  More results at FactBites »



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