Class 4 (4th Engineer) SC&S 📅 Mar 2023

Exam Question

(a) Explain, with reference to moments about the centreline, how the list may be removed (6)

(b) A ship of 12250 tonnes displacement, has KM = 8 meters, KB = 3.8 meters, KG = 8 meters and is floating upright. Find the list if a weight of 2 tonnes, already on board, is shifted transversely through a horizontal distance of 12 meters assuming that the ship is wall-sided (10)

Reference Answer

### (a) Removal of List with Reference to Moments about the Centreline
A ship develops a list when the centre of gravity (G) is not on the centreline. This creates a heeling moment that causes the ship to incline to a static angle. The list can be removed by creating an equal and opposite moment, known as a correcting moment, which brings the centre of gravity back to the centreline.
**1. Principle of Moments:**
* **Heeling Moment:** When a weight 'w' is positioned at a transverse distance 'd' from the centreline, it creates a heeling moment. This moment is the product of the force (weight) and the perpendicular distance (lever) from the centreline.

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