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

Exam Question

(a) Describe how the distribution of mass within the ship affects the rolling period. (6)

(b) The righting moments of a ship at angles of heel of 0, 15°, 30°, 45° and 60° are 0, 1690, 5430, 9360 and 9140 kNm respectively. Calculate the dynamical stability at 60°. (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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