Pass/fail summary of the IS Code 2008 Part A §2.2 general intact-stability criteria: area under GZ to 30°, 40°, 30-40°, GZ at 30°, angle of max GZ, and initial GM.
Formula
$$ A_{30} \geq 0.055, \ A_{40} \geq 0.09, \ A_{30-40} \geq 0.03, \ GZ_{30} \geq 0.2, \ \theta_{max} \geq 25°, \ GM_0 \geq 0.15 $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $A_{30}$ | Area under GZ to 30° | m·rad | stability booklet |
| $GZ_{30}$ | Righting arm at 30° | m | GZ curve |
| $\theta_{max}$ | Angle of maximum GZ | deg | GZ curve |
| $GM_0$ | Initial metacentric height (fluid) | m | inclining / KN-KG |
Sources
- IMO 2008 IS Code Part A §2.2.