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Understanding and calculating marine displacement is essential for the design and operation of ships. This tutorial delves into the formulas and calculations associated with marine displacement, focusing on length, breadth, draft, and block coefficient.
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle , by first calculating the volume of water displaced by the ship, then converting that value into weight.
14 lis 2006 · One small question: how is the hull displacement calculated? You need to know waterline length, waterline beam, and body draught amidships (just body, not total draught under the keel). Then you need the "Block coefficient" which may vary a lot depending on hull forms.
8 lis 2013 · You can roughly calculate you displacement by multiplying your water plane by it's hull only midship draft and employing a qualifier. Of course, this only tells you what you've drawn, not the boat's actually displacement.
A boat's displacement is defined as the weight of the volume of water displaced by it when afloat. It's normally described in long tons (1 ton = 2,240 lbs) but it can also be stated in cubic feet, with 1 ft3 = 64lb.
The prismatic coefficient is the ratio of actual underbody volume to the volume of a prism having a length equal to the DWL, and a section equal to the boat's maximum sectional area. The prismatic coefficient provides an indication of the distribution of displacement.
HULL FORM AND GEOMETRY. Be familiar with ship classifications. Explain the difference between aerostatic, hydrostatic, and hydrodynamic support. Be familiar with the following types of marine vehicles: displacement ships, catamarans, planing vessels, hydrofoil, hovercraft, SWATH, and submarines.
