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The metacentric height (GM) is a measurement of the initial static stability of a floating body. [1] It is calculated as the distance between the centre of gravity of a ship and its metacentre . A larger metacentric height implies greater initial stability against overturning.
At design combat displacement, the ships' (GM) metacentric height was 9.26 ft (2.82 m). [30] They also have excellent maneuverability in the open water for their size, while seakeeping is described as good, but not outstanding.
Generally these Coast Guard rules concern a minimum metacentric height or a minimum righting moment. Because different countries may have different requirements for the minimum metacentric height, most ships are now fitted with stability computers that calculate this distance on the fly based on the cargo or crew loading.
The metacentric height (GM), which dominates stability, can be estimated from the design, but an accurate value must be determined by an inclining test. The inclining test is usually done inshore in calm weather, in still water, and free of mooring restraints to achieve accuracy.
Her metacentric height increased to 1.93 meters (6 ft 4 in) from her designed 1.76 meters (5 ft 9 in) mainly because she now carried much of her fuel in her double bottom rather than in coal bunkers high on the sides of the ship. More weight was added to her before World War II, including an increase in the thickness of her turret roofs to 152 ...
The ship's metacentric height at deep load was 2.35 meters (7 ft 9 in). [6] In November 1944, the tops of Nagato ' s mainmast and funnel were removed to improve the effective arcs of fire for her anti-aircraft guns.
Angle of loll is the state of a ship that is unstable when upright (i.e. has a negative metacentric height) and therefore takes on an angle of heel to either port or starboard. When a vessel has negative metacentric height (GM) i.e. , is in unstable equilibrium, any external force applied to the vessel will cause it to start heeling.
The vessel is in normal operational configuration. The hull is not breached in any compartment. The vessel will be expected to meet various stability criteria such as GMt (metacentric height), area under the GZ (righting lever) curve, range of stability, trim, etc.