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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]
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.
Below: a lower deck of the ship. [1] Belowdecks: inside or into a ship, or down to a lower deck. [13] Bilge: the underwater part of a ship between the flat of the bottom and the vertical topsides [14] Bottom: the lowest part of the ship's hull. Bow: front of a ship (opposite of "stern") [1]
The purpose of a load line is to ensure that a ship has sufficient freeboard (the height from the waterline 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 ...
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.
An example of such an application is the lengthening of ships. In some cases a ship is actually cut in two while still in the water, and a new section of ship is floated in to lengthen the ship. The cutting of the hull is done inside a cofferdam attached directly to the hull of the ship; the cofferdam is then detached before the hull sections ...
Retrieved from "https://en.wikipedia.org/w/index.php?title=Freeboard_(ship)&oldid=302763000"This page was last edited on 18 July 2009, at 12:35
Model of a French 74-gun ship from 1755 showing tumblehome as its hull narrows rising to the upper deck. Tumblehome or tumble home is the narrowing of a hull above the waterline, giving less beam at the level of the main deck. The opposite of tumblehome is flare.