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Example Formula. The primary formula used to calculate the displacement of a ship is based on its physical dimensions and block coefficient. The block coefficient is a dimensionless number that describes how closely the shape of a ship resembles a rectangular block. Displacement = Length × Breadth × Draft × Block Coefficient. Where:
Calculation. Shipboard stability computer programs can be used to calculate a vessel's displacement. The process of determining a vessel's displacement begins with measuring its draft. [3] . This is accomplished by means of its "draft marks".
14 lis 2006 · The usual calculation for displacement is determined by the areas of underwater sections (normally divided into 10 equal sections along the waterline length.) These numbers are punched into a formula called Simpsons Rule (just google it) which has long been the method for displacement calculation.
Power Boats: Power and Range Calcs. At the very least, this takes the displacement, the waterline length, quantity of fuel, horsepower available, and the various vessel speeds, and gives a table or graph of expected range and power usage at different vessel speeds. What to Expect...
Use 6.0 to 6.5 as a target for LDR in a glass-sandwich built cruising catamaran. To adjust LDR and fully loaded displacement mLDC, change the length/beam ratio of hull, LBR. We can now estimate our empty boat displacement (kg): mLCC := 0.7 ⋅ mLDC. mLCC = 4995.
By Archimedes' principle, displacement mass is equal to displacement volume multiplied by the density of the water (nominally 1000 kg/m 3 or 62.4 lb/ft 3 for fresh water, 1025 kg/m 3 or 64 lb/ft 3 for seawater). This is the figure that should be used for all performance ratios and comparisons.
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.
