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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.
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 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.
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 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.
These changes increased her overall length to 224.94 m (738 ft), her beam to 34.6 m (113 ft 6 in) and her draft to 9.49 meters (31 ft 2 in). Her displacement increased over 7,000 metric tons (6,900 long tons) to 46,690 metric tons (45,950 long tons) at deep load. The ship's metacentric height at deep load was 2.35 meters (7 ft 9 in). [6]
Metacentric may refer to: Metacentric height, the distance between the center of gravity of a ship and its metacenter; Metacentric centromere, ...
Air draft is the minimum height a ship needs to pass under, while standard draft is the minimum depth a ship needs to float over. Length between perpendiculars – The distance between where the forward part cuts the waterline and the rudder post of the ship.