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SPEED TO LENGTH RATIO For a displacement boat, speed is a function of waterline length. The maximum theoretical speed is ordinarily assumed to be 1.34 times the square root of the LWL. Speed to Length Ratio = Velocity in Knots Waterline Length = V LWL
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.
RESISTANCE AND POWERING OF SHIPS. Define effective horsepower (EHP) conceptually and mathematically. State the relationship between velocity and total resistance, and velocity and effective horsepower. Write an equation for total hull resistance as a sum of viscous resistance, wave making resistance and correlation resistance.
– 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.
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".
13 gru 2015 · The first of these, the Displacement-Length Ratio (D/L) is a nondimensional expression of how heavy a boat is relative to its waterline length. A D/L ratio is calculated by dividing a boat’s displacement in long tons (2,240 pounds) by one one-hundredth of the waterline length (in feet) cubed.
