Measurement
The metacentric height is normally estimated during the design of a ship but can be determined by an inclining test once it has been built. This can also be done when a ship or offshore floating platform is in service. It can be calculated by theoretical formulas based on the shape of the structure.
The angle(s) obtained during the inclining experiment are directly related to GM. Prior to the inclining experiment, an accounting of the 'as-built' centre of gravity is done; knowing KM and KG, the metacentric height (GM) can be calculated.
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“That’s the great danger of sectarian opinions, they always accept the formulas of past events as useful for the measurement of future events and they never are, if you have high standards of accuracy.”
—John Dos Passos (1896–1970)