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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. [1] In commercial vessels, the latter criterion measured relative to the ship's load line, regardless of deck arrangements, is the mandated and regulated meaning. [2]
Except for the timber winter North Atlantic freeboard, the other freeboards are less than the standard freeboards. This allows these ships to carry additional timber as deck cargo, but with the facility to jettison this cargo. The letters on the timber load line marks have the following meanings: LTF – timber tropical fresh water
It is the lowest deck in a ship. [6] Poop deck: The deck forming the roof of a poop or poop cabin, built on the upper deck and extending from the mizzenmast aft. Promenade deck: A "wrap-around porch" found on passenger ships and riverboats encircling the superstructure. This can have open railings or be enclosed in glass, or a combination.
The assignment of freeboard (and therefore applicable load line) is dependent on the: type of ship [1] structure of the ship [1] areas and seasons the ship trades in, eg winter North Atlantic [1] other safety measures for special conditions, including certain cargoes. [1] Ships are also categorised as either a type A ship or a type B ship.
Lightweight displacement – LWD – The weight or mass of the ship excluding cargo, fuel, ballast, stores, passengers, and crew, but with water in the boilers to steaming level. Loadline displacement – The weight or mass of the ship loaded to the load line or plimsoll mark. Deadweight tonnage (DWT) is a measure of how much weight a ship can ...
A ship will sink if the transverse bulkheads are so far apart that flooding a single compartment would consume all the ship's reserve buoyancy. Aside from the possible protection of machinery, or areas most susceptible to damage, such a ship would be no better than a ship without watertight subdivision, and is called a one-compartment ship.
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Fairlead: a deck fitting for redirecting a line and minimizing chafe. Fiddle (or fiddle rail). a low rail on a counter, stove, or table for preventing items from sliding off when the boat is heeled at sea. Catamarans have less need than monohulls for fiddles. Freeboard: the part of the hull between the waterline and deck of a vessel.