Turning moment generated by a tug pulling at a given position - used to evaluate effectiveness of stern / bow tugs during manoeuvring.
Formula
$$ M = F \cdot d \cdot \cos\alpha $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $F$ | Tug pulling force | kN | bollard pull |
| $d$ | Distance from pivot | m | tug configuration |
| $\alpha$ | Line angle from perpendicular | deg | ship-handling |
Sources
- Hensen - Tug Use in Port.