Estimate tug bollard pull needed for a given displacement based on Henn & Dunlop empirical rule used in major ports.
Formula
$$ BP \approx 60 \cdot \tfrac{\Delta}{60000} + 0.2, \quad BP_\text{wind} = 1.5 \cdot \tfrac{F_\text{wind}}{g} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $Δ$ | Ship displacement | t | loading computer |
| $A$ | Exposed side area above water | m² | GA plan |
| $V$ | Design wind speed | m/s | port rules |
| $BP$ | Bollard pull required per tug | t | result |
Sources
- PIANC WG30 - Tugs and Marine Operations.
- Port of Rotterdam Tug Assistance Guidelines.