Definitions for "Centre of gravity"
The point at which the weight of a component acts.
The spot where the mass or weight of an aeroplane may be said to centre. The position of the centre of gravity of a model aircraft will determine how stable the aircraft is in flight. As the centre of gravity moves rearward (towards the tail) the aircraft will become more and more unstable. In models powered by internal combustion engines with fuel tanks situated in front of the centre of gravity it is important that the centre of gravity is set with the fuel tank empty. Otherwise, as the fuel is used the aircraft will become unstable. The centre of gravity may be assessed by balancing the aircraft on two finger tips placed either side of the fuselage.
the point within something at which gravity can be considered to act; in uniform gravity it is equal to the center of mass
Keywords:  gyration, radius
The radius of gyration