GLASGOW COLLEGE OF NAUTICAL STUDIES
SHIP STABILITY 1
D78A 34
TUTORIAL 5: Transverse Statical Stability
1. A ship displaces 12460 tonnes and is heeled by external forces to 6º. Calculate the moment of statical stability (righting moment) if the ship has a metacentric height (GM) of 0.46 m.
(599 t-m)
2. A ship has a displacement of 14360 t. Calculate the minimum GM necessary to ensure that the righting moment at 3º heel is 600 t-m.
(0.798 m)
3. Sketch a vessel heeled to a small angle of inclination by an external force that is in a stable condition. Clearly indicate and label the following: G; B for both the upright and heeled condition; M; angle of heel; GZ and lines of action of Wf and Bf.
3. Sketch a vessel heeled to a small angle of inclination by an external force that is in a neutral condition of stability. Clearly indicate and label the following: G; B for both the upright and heeled condition; M; angle of heel; GZ and lines of action of Wf and Bf.
4. Sketch a vessel heeled to a small angle of inclination by an external force that is in an unstable condition of stability. Clearly indicate and label the following: G; B for both the upright and heeled condition; M; angle of heel; GZ and lines of action of Wf and Bf.
5. Sketch a vessel that is lying at an angle of list. Clearly indicate and label the following: G; B for both the upright and listed condition; M; angle of list and lines of action of Wf and Bf.
6. (a) Sketch a vessel that is lying at an angle of loll. Clearly indicate
and label the following: G; B for both the upright and lolled condition; M; angle of loll and lines of action of Wf and Bf.
(b) Sketch the vessel in (a) after it has been heeled beyond the angle of loll by an external force. Clearly indicate and label the following: G; B for the heeled condition; M; angle of heel; GZ and lines of action of Wf and Bf.
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TUTORIAL 5 – Transverse Statical Stability (MAR Rev 18/11/03
dariusz.lipinski