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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.
The sail area-displacement ratio ( SA/D) is a calculation used to express how much sail a boat carries relative to its weight. [1] In the first equation, the denominator in pounds is divided by 64 to convert it to cubic feet (because 1 cubic foot of salt water weights 64 pounds).
17 mar 2011 · Assuming as an example a hypothetical 12,000-pound boat with a sail area of 650 square feet, you would calculate its SA/D ratio by first dividing 12,000 by 64 to find its displacement in cubic feet (12,000 ÷ 64 = 187.5).
Full planing boats seem to favor a range of from .65 to .70. Planing is more easily achieved with a higher prismatic (displacement distributed toward the ends). For planing boats many of the same considerations apply as for displacement hulls.
There are several methods and tools available to accurately determine the distance traveled while boating. GPS Technology: Global Positioning System (GPS) devices have become a standard tool for boaters. GPS receivers use signals from satellites to calculate your exact position and track your movement in real-time.
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SA/D Calculator. This calculation indicates the power of the sailplan relative to the displacement of the boat, regardless of length. Caution & Warning.... Oh the ways we can deceive. As with the D/L ratio, the displacement figure used must reflect the real-world weight of the boat in the water.
