The position of the centre of buoyancy is largely beyond the control of the diver, though the cylinder ( s ) may be shifted in the harness by a small amount, and the volume distribution of the buoyancy compensator has a large influence when inflated.
12.
The position of the diver's centre of gravity is determined by the distribution of weight, and buoyancy is determined by the equipment in use, particularly the buoyancy compensator, which can significantly influence centre of buoyancy shifts as it is inflated and deflated.
13.
In almost all cases the centre of buoyancy of a diver with an inflated buoyancy compensator is nearer the head than the centre of gravity, and buoyancy compensators are all designed to provide this as the default condition, as an inverted diver floating at the surface is at risk of drowning.
14.
The stability of a buoyant object at the surface is more complex, and it may remain stable even if the centre of gravity is above the centre of buoyancy, provided that when disturbed from the equilibrium position, the centre of buoyancy moves further to the same side that the centre of gravity moves, thus providing a positive righting moment.
15.
The stability of a buoyant object at the surface is more complex, and it may remain stable even if the centre of gravity is above the centre of buoyancy, provided that when disturbed from the equilibrium position, the centre of buoyancy moves further to the same side that the centre of gravity moves, thus providing a positive righting moment.
16.
There can be a conflict between the requirements for good surface trim and large reserve of buoyancy, particularly with back inflation systems, where a large volume is more likely to move the centre of buoyancy further back than the centre of gravity, and moving the centre of gravity further back by shifting weights may compromise trim stability at neutral buoyancy.
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