η_H = (1 − t) / (1 − w). Usually 1.05–1.15 for single-screw full-form hulls - the wake gain outweighs thrust deduction.
Formula
$$ \eta_H = \frac{1 - t}{1 - w} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $t$ | Thrust deduction fraction | - | wake-thrust calculator |
| $w$ | Taylor wake fraction | - | wake-thrust calculator |
| $\eta_H$ | Hull efficiency | - | result |
Sources
- Harvald - Resistance and Propulsion of Ships.