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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:
The traditional way of weight classification is to divide the ship’s total displacement into lightship weight (WLS) and total deadweight (DWT). The lightship weight is defined s: = + + + 𝑟𝑔𝑖 (9.1) where : is the structural weight; is the propulsion machinery weight; represents the
Define Reynolds number with a mathematical formula and explain each parameter in the Reynolds equation with units. Be qualitatively familiar with the following sources of ship resistance: Steering Resistance Air and Wind Resistance Added Resistance due to Waves Increased Resistance in Shallow Water.
estimation of ship’s displacement weight ∆. For deadweight carriers, it is possible to estimate Δ for a given deadweight DWT, for instance, as the DWT is one of shipowner’s main requirements. Typical ways of estimating ∆ are the following: a. Using DWT/Δ ratios for various types of ships (see Table 2.1); b.
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.
So to convert displacement to cubic meters of sea water, divide the weight in metric tons by 1.025 which is the specific gravity of seawater = volume of displacement in cubic meters of sea water. We raise the volume of displacement to the 2/3rds power to convert it from cubic units to square units.
Those two topics are covered first. The manner to determine a boat hull maximum displacement by both tank testing and by mathematical means (aka Simpson’s Rule) is covered. An example mathematical calculation follows. Then the three steps in determining the capacities – 1. Establishing an upper limit for weight capacity - (from boat ...
