What is Angle of Loll?

A ship is in an unstable condition if, when heeled by an external force in still water to a small angle, it continues to heel further when the external force is removed.

Consider a ship that is floating upright in still water with G and B as shown. The initial transverse metacentre (M) is below G.

i.e. KM – KG = GM; which has a negative value

The ship now heels to a small angle of inclination.

Consider the lines of action of W_f and B_f. They are acting in such a way to cause the ship to heel further over. GZ is a capsizing lever!

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