Deck General · Righting Arm & GZ Curve
On a curve of statical stability, the angle at which GZ first reaches zero after the peak is called the:
- AAngle of vanishing stability✓ Correct
- BAngle of loll
- CMetacentric angle
- DAngle of contraflexure
Explanation
The angle of vanishing stability (AVS) is the heel angle at which the righting arm GZ returns to zero on the downward slope of the GZ curve. Beyond this angle the righting moment becomes negative and capsize follows unless external restoring force is applied.
Authority: Stability & Trim (USCG deck topic)
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