Transport & Manufacturing
Marine Propeller Pitch, Slip Ratio & Theoretical Boat Speed Sizer
Calculate marine propeller pitch, slip ratio & theoretical boat speed using the stated engineering or scientific relationship and adjustable field inputs.
Preparing your result…
What this calculator does
Calculates Marine Propeller Pitch, Slip Ratio & Theoretical Boat 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
No-slip speed (mph) = pitch (in) × engine RPM ÷ (gear ratio × 1,056); estimated speed = no-slip speed × (1 − slip); prop RPM = engine RPM ÷ gear ratio
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
- • No-slip advance speed mph=pitch(in)×engine RPM/[gear reduction×1056]. Estimated speed with supplied apparent slip fraction=speed_no-slip×(1−slip). Propeller RPM=engine RPM/gear reduction.
Sources and review
Reviewed 2026-10-18 · Next review 2027-04-18
- • The original labels slip-corrected speed as theoretical and omits conversion to conventional speed units. Define ratio as engine:propeller, slip percent/fraction and water-referenced speed. This evaluates a supplied slip value; it does not predict slip or equal propulsive efficiency.
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 | Propeller pitch (in) | Engine RPM (RPM) | Gear ratio (engine : propeller) | Estimated boat speed (with slip) |
|---|---|---|---|---|
| Worked example | 19 | 5,500 | 2 | 44.5313 mph |
| Half the amounts | 9.5 | 2,750 | 1 | 23.5026 mph |
| Double the amounts | 38 | 10,000 | 4 | 71.9697 mph |
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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