The metacentric height (GM) is calculated as the distance between the center of gravity (G) and the metacenter (M) of a ship[1][4]. The formula for calculating the metacentric height is GM = KM - KG, where KM is the height of the metacenter above the keel and KG is the height of the center of gravity above the keel[4]. The metacentric height can also be calculated by dividing the metacentric radius by the roll or pitch angle[2]. The metacentric radius is the distance between the center of buoyancy and the metacenter[2]. The metacentric height is an approximation for the vessel stability at a small angle (0-15 degrees) of heel[1]. The height of the intersection above the base (YZ), when measured on the GZ scale, will give the initial metacentric height[6]. The formula for calculating the metacentric radius is BM = I / V, where I is the moment of inertia of the waterplane area of the ship around the axis of rotation under consideration, and V is the volume of the underwater part of the ship[5].
Citations:
[1] Metacentric height - Wikipedia https://en.wikipedia.org/wiki/Metacentric_height
[2] How do you calculate the metacentric height of a ship with a complex hull shape? - LinkedIn https://www.linkedin.com/advice/1/how-do-you-calculate-metacentric-height-ship
[3] Determination of Metacentric Height of a Floating Body - The Constructor https://theconstructor.org/practical-guide/metacentric-height-floating-body/30000/?amp=1
[4] LESSON TOPIC: 4 https://man.fas.org/dod-101/navy/docs/swos/dca/stg4-01.html
[5] Formula of metacentric height - Physics Forums https://www.physicsforums.com/threads/formula-of-metacentric-height.860585/
[6] Initial Metacentric Height - an overview | ScienceDirect Topics https://www.sciencedirect.com/topics/engineering/initial-metacentric-height
By Perplexity at https://www.perplexity.ai/search/42cd622a-5dfe-4aa4-8c25-bfe03c2bb0bc?s=m
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