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

Exam Question

(a) Define 'light displacement' and load displacement' (6)

(b) A ship of 8000 tonne displacement has a metacentric height of 0.46 m, centre of gravity 6.6 m above the keel and the centre of buoyancy 3.6 m above the keel. Calculate the second moment of area of the water plane about the centre line of the ship. (10)

Reference Answer

### (a) Definitions
#### Light Displacement
Light Displacement, also known as 'Lightship Weight' or 'Lightweight', is the mass of the ship as it is delivered from the shipyard. It represents the weight of the ship itself, complete and ready for sea, but without any items that are consumed or vary during a voyage.
Specifically, it includes:

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