ANGLE OF LOLL: When a Ship Leans for a Reason

A ship that suddenly heels without any obvious weight shift may not simply have a list—it could be experiencing an Angle of Loll, a condition caused by negative metacentric height (GM) and a loss of initial stability.

Understanding the difference is critical. An Angle of Loll is corrected by restoring stability (increasing GM), not by forcing the ship upright. Improper corrective actions can make the situation even more dangerous.

Key Takeaways:

• Negative GM causes the vessel to seek a new equilibrium angle.
• High KG, free surface effect, and poor ballast management are common causes.
• Confirm the cause before taking corrective action.
• Stabilize first, then straighten.

Knowledge of ship stability saves lives, protects cargo, and keeps vessels operating safely at sea.