Transport & Manufacturing
Marine Vessel Hull Speed ($1.34 \times \sqrt{LWL}$) Displacement Sizer
Calculate marine vessel hull speed ($1.34 \times \sqrt{lwl}$) displacement using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Marine Vessel Hull Speed ($1.34 \times \sqrt{LWL}$) Displacement Sizer using the formula verified against the cited source.
What your result means
An estimate from the inputs you enter, within the scope stated below — not advice.
Formula
Hull speed = 1.34 × √(LWL in ft)
The step-by-step working for your own numbers appears with the result above and in the PDF report.
Frequently asked questions
Symbols and assumptions
- Inputs
- The values entered in the fields above
- • Conventional displacement hull-speed estimate knots≈1.34√[waterline length ft]. It follows from deep-water gravity-wave c=√(gλ/2π) with wavelength λ≈LWL and unit conversion.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • Derived wave-speed heuristic, not an absolute vessel speed limit. Use waterline length, not overall length; output is knots. Hull slenderness, planing, multihulls, water depth and propulsion change actual speed/resistance, so this does not size an engine or predict top speed.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
Quick reference
| Scenario | Waterline length (ft) | Hull speed |
|---|---|---|
| Worked example | 32 | 7.5802 kt |
| Half the amounts | 16 | 5.36 kt |
| Double the amounts | 64 | 10.72 kt |
Need the full picture? Get the detailed PDF report with charts, tables, formulas and working steps.
Reviewed 2026-10-18 · Next review 2027-04-18
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