Hull-roughness correlation allowance ΔC_F per ITTC 1978 performance prediction - added to flat-plate C_F in ship extrapolation.
Formula
$$ \Delta C_F = 0.044 \left(\frac{k_s}{L}\right)^{1/3} + 0.000125 $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $k_s$ | Hull roughness | µm | BMT roughness gauge |
| $L$ | Waterline length | m | LWL |
Sources
- ITTC 1978 Performance Prediction.