Compute metacentric height from a controlled weight shift and pendulum deflection - the lightship inclining test at delivery and every 5 years.
Formula
$$ GM = \frac{w \cdot d \cdot L_\text{pend}}{\Delta \cdot \text{deflection}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $w$ | Each inclining weight moved | t | test equipment |
| $d$ | Transverse shift distance | m | test setup |
| $L_\text{pend}$ | Pendulum length | m | measurement |
| $Deflection$ | Pendulum horizontal movement | m | scale reading |
| $Δ$ | Ship displacement at test | t | hydrostatic table |
| $GM$ | Metacentric height | m | result |
Sources
- IMO IS Code MSC.267(85) Part B Ch.7.
- Derrett & Barrass Ch.17.