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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:
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.
19 lut 2024 · The waterplane coefficient (Cw) is calculated by dividing the area of the waterplane by the area of a rectangle with the same length and breadth as the ship’s waterplane but with a constant depth equal to the ship’s draft. Cw = Area of water-plane. L * B. Area of water-plane = L * B * Cw.
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.
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.
27 lis 2019 · The formula for sail area to displacement: ratio = sail area (ft2) / (displacement) 2/3. Generally, if the displacement is measured in pounds, than it can be converted to cubic feet by dividing it by 64, which is how much the cubic foot of a seawater weighs.
The formula for calculating the Sail Area/Displacement Ratio is: SA/ (DISPL)0.67, where... SA is sail area in square feet, and. DISPL is boat displacement in cubic feet.
