Open-Water Efficiency η_O
η_O = (J · KT) / (2π · KQ). Peak open-water efficiency of a typical merchant propeller 0.60–0.72.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Advance ratio | ||
| Thrust coefficient | ||
| Torque coefficient | ||
| Open-water efficiency |
Source: Carlton - Marine Propellers and Propulsion
In short
\u03b7_O = (J \u00b7 KT) / (2\u03c0 \u00b7 KQ).