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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.
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.
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.
Explain each of these resistive terms. Draw and explain the flow of water around a moving ship showing the laminar flow region, turbulent flow region, and separated flow region. Draw the transverse and longitudinal wave patterns when a displacement ship moves through the water.
– Calculate the speed and power for displacement boats by Gerr’s formula. – Calculate power to displacement ratios to the table. – Compare and comment. Kymenlaakso UAS/Terho Halme
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.
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.
