Wetted-surface estimate for displacement hulls from LWL, T and displacement. Used for quick resistance estimates when offsets are unavailable.
Formula
$$ S = 1.7 \cdot L \cdot T + \frac{\nabla}{T} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $L$ | Waterline length | m | ship particulars |
| $T$ | Draft | m | hydrostatics |
| $\nabla$ | Displacement volume | m³ | hydrostatics |
| $S$ | Wetted surface | m² | result |
Sources
- Mumford quoted in SNAME PNA Vol II Ch.5.