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Underwater hull cleaning to remove fouling organisms which increase drag, and therefore reduce top speed and increase fuel consumption. Such cleaning may be of the entire hull or parts thereof, particularly propellers, shafts and thrusters. The underwater hull may be inspected prior to cleaning, and the amount of cleaning done may depend on the ...
In-water cleaning, also known as in-water surface cleaning, is a collection of methods for removing unwanted material in-situ from the underwater surface of a structure.. This often refers to removing marine fouling growth from ship hulls, but also has applications on civil engineering structures, pipeline intakes and similar components which are impossible or inconvenient to remove from the ...
It is used for cleaning or repairing the hull. Before ship's hulls were protected from marine growth by fastening copper sheets over the surface of the hull, fouling by this growth would seriously affect the sailing qualities of a ship, causing a large amount of drag. [1]: 164 As this growth was underwater, removing it was difficult. Beaching ...
Also accommodation hull. A ship or hull used as housing, generally when there is a lack of quarters available ashore. An operational ship can be used, but more commonly a hull modified for accommodation is used. Act of Grace Act of Pardon A letter from a state or power authorising action by a privateer. See also letter of marque. action stations
Woodcut illustrating keelhauling, from the Tudor period (1485–1603). Keelhauling (Dutch kielhalen; [1] "to drag along the keel") is a form of punishment and potential execution once meted out to sailors at sea.
The breadth of the hull lines at the widest point, normally at midships and measured inside the hull planking or plating. Used in some systems of tonnage measurement. [18] moulded depth The distance between the horizontal plane of the top of the keel and the top of the main deck beams at the edge of the hull. Compare with freeboard depth. [4]
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New ship being prepared for launch, showing fresh anti-fouling paint Ship hull being cleaned of fouling in drydock. Anti-fouling paint is a specialized category of coatings applied as the outer (outboard) layer to the hull of a ship or boat, to slow the growth of and facilitate detachment of subaquatic organisms that attach to the hull and can affect a vessel's performance and durability.