Class 4 (4th Engineer) SC&S 📅 Nov 2022

Exam Question

(a) Explain the term capsizing moment. (6)

(b) An oil tanker of 17000 tonne displacement has its centre of gravity 1 m aft of midships and has 250 tonne of oil fuel in its forward deep tank 75 m from midships. This fuel is transferred to the after oil fuel bunker whose centre is 50 m from midships. (10)

200 tonne of fuel from the after bunker is now burned.

Calculate the new position of the centre of gravity:

(a) after the oil has been transferred

(b) after the oil has been used.

Reference Answer

### (a) Capsizing Moment (6 Marks)
A capsizing moment is an external heeling moment acting upon a vessel that is of sufficient magnitude to overcome the vessel's inherent ability to return to an upright position, leading to it overturning or capsizing.
**Key Characteristics and Principles:**
1. **Origin**: Capsizing moments are generated by external forces, unlike an unstable condition caused by an internal negative Metacentric Height (GM). Common sources include:

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