Displacement–length ratio
The displacement–length ratio (DLR or D/L ratio) is a calculation used to express how heavy a boat is relative to its waterline length. (Rousmaniere, 1999)
A DLR is calculated by dividing a boat's displacement in long tons (2,240 pounds) by the cube of one one-hundredth of the waterline length (in feet):
- <math>\mathit{DLR} = \frac{\mathit{displacement}(\mathrm{lb}) ~/~ 2240} {(0.01 \times \mathit{LWL}(\mathrm{ft}))^3}.</math>
The DLR can be used to compare the relative mass of various boats no matter what their length. A DLR less than 200 is indicative of a racing boat, while a DLR greater than 300 or so is indicative of a heavy cruising boat.
References[edit]
- Rousmaniere, J, The Annapolis Book of Seamanship Simon & Schuster, New York, New York, Chapter 1: The boat p26-35, 1999. ISBN 0-684-85420-1
- http://www.sailingusa.info/design_winds.htm
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