Tanker Notes ||
Container Ship Operations ||
Ocean Navigation ||
Maintaining good positive GoM in Container Stowage Plan
Maintaining a good positive GoM is very important but it is not the only criterion for a stable ship.
Dynamic stability of the vessel is equally important and is indicated by the area under the curve of statical stability (GZ curve).
A ship with a small GM will be "tender" - have a long roll period - a low GM increases the risk of a ship capsizing in rough weather and more likely to develop "synchronized rolling".
If a ship with low GM is damaged and partially flooded the metacentric height will be reduced further and make it even less stable.
On the other hand, a too large metacentric height can cause a vessel to be too "stiff"; excessive stability is uncomfortable for persons on board because it quickly snaps back upright after a wave or wind gust which heeled it over has passed.
An overly stiff vessel rolls with a short period and high amplitude.
This can lead to damage to the ship and cause cargo lashing to loosen or break.
Draft, Trim and Heel affecting Hull Strength and Stability of containership
IMO Intact Stability Criterion for containership
Severe Wind and Rolling criterion affecting Hull Strength and Stability of containership
Visibility from Bridge affecting navigation of containership
Propeller immersion affecting navigation of containership
Shearing forces, Bending moments and Torsional moment affecting Hull Strength and Stability of containership
Other factors affecting Hull Strength and Stability as necessary
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