Class 2 (2nd Engineer) SC&S 📅 Dec 2025

Exam Question

(a) Explain how the distribution of masses affects rolling and pitching. (6)

(b) A ship turns in a circle of radius 100 metres at a speed of 15 knots. The GM is 2/3 metres and BG is 1 metre. If g = 981 cm/sec² and 1 knot is equal to 1.8532 Km/hour, find the heel due to turning. (10)

Reference Answer

(a) The rolling period is influenced by the ship's metacentric height (GM) and radius of gyration (K) , which are determined by the location of the masses onboard.
Masses at the bottom:
The centre of gravity (G) moves down.
Metacentric height (GM) increases , resulting in greater stability.

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