Angle of loll
Angle of loll is the state of a ship that is
When a vessel has negative metacentric height (GM) i.e., is in unstable equilibrium, any external force applied to the vessel will cause it to start heeling. As it heels, the
At some angle of heel (say 10°), KM will increase sufficiently equal to KG (distance from the keel to the centre of gravity), thus making GM of vessel equal to zero. When this occurs, the vessel goes to neutral equilibrium, and the angle of heel at which it happens is called angle of loll. In other words, when an unstable vessel heels over towards a progressively increasing angle of heel, at a certain angle of heel, the centre of buoyancy (B) may fall vertically below the centre of gravity (G). Angle of
Although a vessel at angle of loll does display features of stable equilibrium, this is a dangerous situation and rapid remedial action is required to prevent the vessel from capsizing.[1][2][3][4]
It is often caused by the influence of a large
See also
- Angle of list
- Capsizing
- Fluid statics
- Kayak roll
- Limit of Positive Stability
- Naval architecture
- Ship stability
- Turtling
- Weight distribution
References
- ^ Kemp, "The Oxford Companion to Ships and the Sea", 1976, p. 494
- ^ "Stability Calculations - Estimating Centre of Gravity". Maritime & Coastguard Agency. Retrieved 2007-01-24.
- ^ "Definition - angle of loll". Maritime Dictionary. Archived from the original on 2010-12-29. Retrieved 2007-01-24.
- ^ "Stability Definitions". MCA Orals. Archived from the original on 26 January 2007. Retrieved 2007-01-24.