its all about balance of forces and definitions. At the end of the day, centre of gravity is static moment distribution on the aircraft……i.e. it is where you put your fulcrum and the thing balances. From an aircraft viewpoint, you can have a longitudinal CofG and a lateral CofG…..not much interested in z axes CofG (unless you are into rockets and motor vehicles and anything that could topple).
When we add aerodynamic forces into the equation you are moving into different territory.
It became obvious to me, at the beginning of my career, that you should keep things as simple as you can……..move to helicopters and it all becomes more and more complex.
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