Transport & Manufacturing
Marine Admiralty Coefficient Engine Power vs Speed Sizer
Calculate marine admiralty coefficient engine power vs speed using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Marine Admiralty Coefficient Engine Power vs Speed 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
Ac = Δ^(2/3) × V³ ÷ P
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
- • Admiralty coefficient Ac=displacement^(2/3)×speed³/power, with the exact tonne/ton, knot and kW/hp conventions stated and retained in every comparison.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • This empirical coefficient is unit-dependent, not dimensionless. Identify shaft/brake/effective power consistently; coefficients on different power bases are not interchangeable. Use similar hulls/loading and relevant speeds only; do not treat Ac as a universal constant or extrapolate to all operating conditions.
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 | Displacement (t) | Speed (kt) | Shaft power (kW) | Admiralty coefficient |
|---|---|---|---|---|
| Worked example | 5,000 | 15 | 4,000 | 246.714 |
| Half the amounts | 2,500 | 7.5 | 2,000 | 38.855 |
| Double the amounts | 10,000 | 30 | 8,000 | 1,566.5362 |
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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