Displacement/Length Ratio: weight for length
D/L relates displacement to waterline length.
Conventional formula
D/L = (displacement_lb / 2240) / (0.01 × LWL_ft)³In plain language
The conventional formula uses displacement in long tons and LWL in feet. One long ton equals 2,240 lb. The application converts units before calculation.
How to interpret it
A higher value suggests more weight relative to LWL. That context can help discuss inertia and acceleration but does not independently predict motion or speed.
Why it matters
It helps compare design approaches among similar monohulls.
Limitations
Loading, overhangs and stated LWL affect the result. It is neither a seaworthiness classification nor a universal comfort scale.
In practice
Always compare the value alongside its inputs, configuration and sources.
Sources & reading
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