Which point is defined as the intersection of buoyancy lines as the hull heels through small angles?

• A. Metacenter
• B. Center of Buoyancy
• C. Center of Gravity
• D. Baseline reference point

Answer: (A)

As a hull heels slightly, the submerged shape changes and the buoyant force shifts to a new center of buoyancy. The lines of action of buoyancy for small heel angles intersect at a single fixed point, which is called the metacenter. This point is important because the stability of the vessel is determined by the metacentric height, the distance between the center of gravity and the metacenter. If the center of gravity lies below the metacenter, the ship tends to right itself; if it lies above, it tends to capsize; if it sits at the metacenter, the stability is neutral.