Class 4 (4th Engineer) SC&S 📅 Aug 2025

Exam Question

(a) Define angle of loll (6)

(b) A box barge 60 m long and 10m wide floats at an even keel draught of 4 m. It has a compartment amidships 12 m long.

Calculate the new draught if this compartment is laid open to the sea when: (10)

(i) µ is 100%

(iii) µ is 85%

(iii) µ is 60%

Reference Answer

### (a) Angle of Loll (6 Marks)
The angle of loll is the angle of heel to port or starboard, at which a vessel with a negative initial metacentric height (GM < 0) will come to rest in still water. It is a state of equilibrium, but one that arises from initial instability.
**Key Characteristics and Mechanism:**
1. **Condition for Occurrence**: The fundamental precondition for the angle of loll is that the vessel's centre of gravity (G) is higher than its initial transverse metacenter (M) when upright. This results in a negative GM value.

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