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negative metacentric height

Metacentric height — Ship Stability diagram showing centre of gravity (G), centre of buoyancy (B), and metacentre (M) with ship upright and heeled over to one side. Note that for small angles, G and M are fixed, while B moves as the ship heels, and for big angles B… … Wikipedia
Center of mass — In physics, the center of mass of a system of particles is a specific point at which, for many purposes, the system s mass behaves as if it were concentrated. The center of mass is a function only of the positions and masses of the particles that … Wikipedia
Angle of loll — is a term used to describe the state of a ship which is unstable when upright (ie: has a negative GMt) and therefore takes on an angle of heel to either port or starboard. [Kemp, The Oxford Companion to Ships and the Sea , 1976, p. 494] [cite web … Wikipedia