Deck General · Angle of Loll
A vessel's GZ curve shows GZ = 0 at 0 degrees, GZ negative at 5-10 degrees, then GZ positive again beyond 15 degrees. This curve is characteristic of a vessel:
- AWith a large positive GM and excellent initial stability
- BIn a state of loll — negative GM upright, with the stable equilibrium at the loll angle where GZ returns to zero✓ Correct
- COverloaded below the load line with positive GM throughout
- DExperiencing free surface effect in a single slack tank
Explanation
A GZ curve that starts at zero, dips negative (below the x-axis), then rises positive again crossing zero at some angle describes a vessel with negative initial GM. The crossing point on the way up is the angle of loll — where the vessel finds stable equilibrium. The negative region between 0 and the loll angle represents the range over which the vessel is unstable.
Authority: Stability & Trim (USCG deck topic)
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