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The Ship
Published in David House, Seamanship Techniques, 2019
The displacement of a vessel is the weight of water it displaces, i.e. the weight of the vessel and all it contains. It is the immersed volume of the ship in cubic metres × density of the water, expressed in tonnes per cubic metre. It is normal practice to regard the ship’s displacement as being that displacement when at her load draught (load displacement).
Stability and Trim—Tonnage, Safety of Life at Sea, Maritime Organizations, and Sea Change
Published in George A. Maul, The Oceanographer's Companion, 2017
In the aforementioned example, the research vessel is listed as 500 tons. This is displacement tonnage given in long tons (2240 lbs per long ton), the mass of water displaced by the vessel. Oceanographers and ocean engineers usually think of mass in terms of density. Seawater density is typically cited as 1025 kg/m3. To convert: 1025 kg/m3 × 2.2046 lbs/kg × 1/(3.2808 ft/m3) = 64 lbs/ft3. Similarly, for fresh water the factor is 64 lbs/ft3 × (1000/1025) = 62.43 lbs/ft3, which is often rounded to 62.5 lbs/ft3. The 500-ton vessel would displace: 500tons×2240(lbs/ton)×164 lbs/ft3=17,500ft3. For a typical research vessel, the volume displaced would be length × beam × draft × block coefficient, where the block coefficient for such a ship is about 0.58. A little arithmetic will show that this 500-ton ship could have dimensions of 100-foot long, 30-foot beam, and a 10-foot draft.
The ship
Published in Alan E. Branch, Michael Robarts, Branch's Elements of Shipping, 2014
Alan E. Branch, Michael Robarts
Displacement of a vessel is the weight in tons, each of 2,240 lb, of the ship and its contents. It is the weight of water the ship displaces. Displacement light is the weight of the vessel without stores, bunker fuel or cargo. Displacement loaded is the weight of the vessel plus cargo, passengers, fuel and stores.
The value of jumboization in transportation ships: A real options approach
Published in IISE Transactions, 2021
Fikri Kucuksayacigil, K. Jo Min
Sen and Yang (1998) express power as follows: where is the gravitational constant (m/s2) and and are coefficients (recall that is speed). Equation (2) is subject to the constraints and stemming from mechanical principles. (They also represent boundaries of empiricism because Equation (2) is an empirical relationship. See the Supplemental Online Materials for more explanation.) For example, increasing the length causes a greater chance of rolling down. In addition to mechanical constraints, topological barriers of routes require ships not to exceed certain levels in these dimensions. Note that the power expressed in Equation (2) represents the maximum power (often called installed power) required to propel the ship, because by definition, is the maximum number of tonnes that a ship can carry. Equation (2) captures many realities. For example, at constant displacement, if the length of the ship increases, then the maximum power required in moving it decreases; this supports the fact that a longer hull creates less resistance and leads to a smaller power requirement.