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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 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.
SOME BASIC FORMULAS Area of Waterplane = L x B x CW …. L = Length of vessel …. B = Breadth of vessel ...CW = Co-efficient of Waterplane Volume of Displacement = L x B x d x CB …. d = depth of vessel ….CB = Block co-efficient Volume (V) = L x B x d Displacement (W) = L x B x d x R.D ...
define boat dimensions and calculate boat parameters. explain factors interacting stability. evaluate stability of a sail boat using Dellenbaugh method. explain and estimate elements of sail boat performance. estimate boat speed and power requirements. explain structure and content of lines drawing. prepare a proposal concept design.
displacement. Assuming that the hydrodynamic effects are proportional to the relative velocity and acceleration the equation of motion in waves becomes: 𝑧= − (𝑧̈−ϛ̈) − ̈(𝑧̇−ϛ̇) − (𝑧−ϛ) (6-5) Or
Draw the transverse and longitudinal wave patterns when a displacement ship moves through the water. 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:
