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So practicalities to make the boat useable force the compromise. To answer CT's question, boats are paid for primarily by length--purchase price, taxes, insurance, marina fees, etc. Therefore, if you can pack more accommodation into the boat for a given length (at otherwise constant ownership cost), the depth and beam have to be larger.


If a boat is going to spend most of its time in a marina or at anchor, relatively low L/B implies a larger, more spacious interior and increased carrying capacity when compared to slimmer competitors of the same length. For a boat that must entertain guests at the dock but will rarely be used in rough weather or at high speeds, this may be a ...


The beam of a ship is its width at the widest point as measured at the ship's nominal waterline.The beam is a bearing projected at right-angles from the fore and aft line, outwards from the widest part of ship. Beam may also be used to define the maximum width of a ship's hull, or maximum width including superstructure overhangs.


The Golden Ratio, represented by the Greek letter phi, is an irrational number that is approximately equal to 1.618033. This ratio is commonly used in design to form anything for a robust structure to one of pure beauty. For instance, the ratio of...


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.


This is a handy rule whereby boat speed in knots (V) is compared to hull waterline length in feet (L) where V divided by the square root of L = the speed/length ratio or S/LR. By way of example a boat 30 feet on the waterline at 6 knots has a S/LR of: 6 / 5.48 = 1.095.


The displacement/length ratio (or D/L ratio) is the tool yacht designers have created to do this. To find a boat’s D/L ratio, you first calculate its displacement in long tons (DLT), with 1 long ton equaling 2,240 pounds. Then take the boat’s load waterline length (LWL), multiply it by 0.01, and cube the result.


The ratios of some of the hull dimensions - Length, Breadth, Depth, Draught (Draft) have an effect on the vessel in terms of stability, manoeuvring, speed, power, steel weight etc. These are described below: L/B (Length-Breadth Ratio) This proportion is kept nearly same or within a small range for most vessels of the particular type.


SAIL AREA RATIOS Below are a few sail area calculations to consider. Naturally, opinion varies re: what is adequate sail area. These ratios therefore merely yield an approximate range. They are an attempt to take empirical feedback from sailmakers, boat owners, racers, cruisers, designers, and come up with a rule of thumb.


How To Measure Your Boat. ... Performance: The ratio of length to beam indicates how well a vessel performs. A larger length to width ratio shows a high-speed boat since it has less wave resistance. Loading capacity: The loading capacity of a boat is calculated by its length multiplied by its beam. A larger area makes a hull take more weight.