![]() ![]() Deadweight tonne (DWT) - The total that the vessel can carry that is cargo, fuel, ballast, people and stores.ĭraft or draught (d) or (T) - The vertical distance from the bottom of the keel to the waterline. Loadline displacement - The weight or mass of the ship loaded to the load line or plimsoll mark. 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. To preserve secrecy, nations sometimes misstate a warship's displacement. Displacement is expressed in Tonne (metric unit) ship built for USA will be in imperial tons, Warships are shown in displacement tons or tonne. ( Merchant ships display gross tonnage see tonnage), deadweight and the number of items it can carry i.e. It is a measurement of capacity for cargoes such as grain, where the cargo flows to conform to the shape of the ship.ĭisplacement - A measurement of the weight or mass of the vessel, at a given draught. Grain Cube (or Grain Capacity)- The maximum space available for cargo measured in cubic metres or feet, the measurement being taken to the inside of the shell plating of the ship or to the outside of the frames and to the top of the beam or underside of the deck plating. It is a measurement of capacity for cargo in bales or pallets, etc, where the cargo does not conform to the shape of the ship. ![]() There are two common types:īale Cube (or Bale Capacity)- The space available for cargo measured in cubic metres or feet to the inside of the cargo battens, on the frames, and to the underside of the beams. For warships, the number of people assigned to a ship in peacetime may be considerably less than her full complement.Ĭube - The cargo carrying capacity of a ship, measured in cubic metres or feet. Includes officers and crew does not include passengers. The lower the ratio the greater the boat's stability.Ĭarlin - similar to a beam, except running in a fore and aft direction.Ĭomplement - The full number of people required to operate a ship. The ratio of LOA/BOC is used to estimate the stability of multihull vessels. This term in typically used in conjunction with LOA (Length overall see below). For a trimaran: the perpendicular distance between the centerline of the main hull and the centerline of either ama, measured at deck level. The BOC for vessels is measured as follows: For a catamaran: the perpendicular distance from the centerline of one hull to the centerline of the other hull, measured at deck level. Beam on Centerline (BOC) - Used for multihull vessels. There are two types:īeam, Overall (BOA), commonly referred to simply as Beam - The overall width of the ship measured at the widest point of the nominal waterline. Beam - A measure of the width of the ship. ![]()
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