Class 4 (4th Engineer) SC&S 📅 Mar 2024

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 buoyaney 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

### (a) Relative Positions of K, B, G, and M for a Stable Ship
For a ship to be in stable equilibrium, the relative positions of the Keel (K), Centre of Buoyancy (B), Centre of Gravity (G), and the Metacentre (M) are critical. The following describes these points and their typical arrangement in an upright, stable vessel.
**1. Key Points of Stability:**
* **Keel (K):** This is the structural baseline of the ship, the lowest point of the hull structure on the centreline. It serves as the primary vertical datum (reference point) for all stability calculations (e.g., KB, KG, KM).

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