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

Exam Question

(a) With aid of a simple sketch, show the normal positions of centre of gravity of a stable ship relative to keel, centre of buoyancy and meta centre (6)

(b) A ship has 300 t of cargo in the hold, 24 m forward of the midships. The displacement of the vessel is 6000 t and its centre of gravity is 1.2 m forward of midships. Find the new position of the centre of gravity if this cargo is moved to an after hold, 40 m from midships. (10)

Reference Answer

### Part (a): Positions of Centre of Gravity, Buoyancy, and Metacentre
For a ship to be in stable equilibrium, the relative positions of its Keel (K), Centre of Buoyancy (B), Centre of Gravity (G), and Metacentre (M) are critical. The sketch would illustrate these points on a transverse section of a ship's hull in the upright condition.
**1. Key Definitions:**
* **Keel (K):** The structural baseline of the ship, typically the lowest point of the hull structure on the centreline.

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