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In sailing and boating, a vessel's freeboard is the distance from the waterline to the upper deck level, measured at the lowest point of sheer where water can enter the boat or ship. In commercial vessels, the latter criterion measured relative to the ship's load line , regardless of deck arrangements, is the mandated and regulated meaning.
Freeboard: a higher-sided boat stays drier in rough water. The advantage of high sides is extra weight, extra wind resistance , [43] and increased susceptibility to cross-winds. Stability and immersed bottom shape: the hull can be optimized for initial stability (the boat feels steady when it sits flat on the water) or final stability ...
Freeboard deck: assigned by a classification society to determine the ship's freeboard; usually the highest continuous deck, i.e. equivalent to the main deck. Gun deck: on a multi-decked vessel, a deck below the upper deck where the ships' cannon were carried.
The purpose of a load line is to ensure that a ship has sufficient freeboard (the height from the water line to the main deck) and thus sufficient reserve buoyancy. The freeboard of commercial vessels is measured between the lowest point of the uppermost continuous deck at side and the waterline and this must not be less than the freeboard ...
A 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 ...
A bulk carrier or bulker is a merchant ship specially designed to transport unpackaged bulk cargo —such as grain, coal, ore, steel coils, and cement—in its cargo holds. Since the first specialized bulk carrier was built in 1852, economic forces have led to increased size and sophistication of these ships. Today's bulk carriers are specially ...
The landing craft, vehicle, personnel (LCVP) or Higgins boat was a landing craft used extensively by the Allied forces in amphibious landings in World War II.Typically constructed from plywood, this shallow-draft, barge-like boat could ferry a roughly platoon-sized complement of 36 men to shore at 12 knots (14 mph; 22 km/h).
The height and the weight of superstructure on board a ship or a boat also affects the amount of freeboard that such a vessel requires along its sides, down to her waterline. In broad terms, the more and heavier superstructure that a ship possesses (as a fraction of her length), the less the freeboard that is needed.
Capsizing or keeling over occurs when a boat or ship is rolled on its side or further by wave action, instability or wind force beyond the angle of positive static stability or it is upside down in the water.
Freeboard (FB) is depth plus the height of the keel structure minus draft. Length at the waterline ( LWL ) is the length from the forwardmost point of the waterline measured in profile to the stern-most point of the waterline.