The weight of the ship (W) acts vertically downwards through the centre of gravity (G). The centre of buoyancy has moved from B to B1 parallel to gg1, and the force of buoyancy (W) acts vertically upwards through B1. The moment is referred to as the moment of statical stability and may be defined as the moment to return the ship to the initial position when inclined by an external force.Ī ship which has been inclined by an external force is shown in picture below. These two equal and opposite forces produce a moment or couple which may tend to right or capsize the ship. The force of buoyancy is considered to act vertically upwards through the centre of buoyancy.The weight of the ship is considered to act vertically downwards through the centre of gravity. When a ship is inclined by an external force, such as wind and wave action, the centre of buoyancy moves out to the low side, parallel to the shift of the centre of gravity of the immersed and emerged wedges, to the new centre of gravity of the under-water volume.
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