Hull Efficiency η_H
η_H = (1 − t) / (1 − w). Usually 1.05–1.15 for single-screw full-form hulls - the wake gain outweighs thrust deduction.
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Formula, assumptions, and limits
| Symbol | Meaning | Unit |
|---|---|---|
| Thrust deduction fraction | ||
| Taylor wake fraction | ||
| Hull efficiency |
Source: Harvald - Resistance and Propulsion of Ships
In short
\u03b7_H = (1 \u2212 t) / (1 \u2212 w).