Moppy wrote: ↑
Therefore either activating a black globe in orbit results in gravity negation, which means you leave orbit, so you have made a manoeuer under black globe - ...
You did not make any manoeuvre, you continue on you present course (vector) as the planet accelerates away from you under the influence of gravity. There is no contradiction.
Moppy wrote: ↑
I admit one of the points was badly written but it’s difficult to write clearly about magic.
Try quantum mechanics sometime, it's far more magical than black globes, but can still be precisely described, at least in mathematics.
Moppy wrote: ↑
What I meant is that, does the black globe negate gravity by absorbing gravitional energy (whatever that is)? If so, it places a timer on the operation of the device, since it must eventually fill.
Ah, I understand.
Well, apparently not. Gravity is not radiated energy, it's considered a force (Newton) or geometry (Einstein). Like a rope it can be used to drag an object and let both ends of the rope exchange energy state, but it is not energy radiation like a photon (as far as we know, pending finding the graviton).
Moppy wrote: ↑
Why would a black globe stop permanently when it collided with an object? It will distintegrate what it touches, and then you can move it again.
It absorbs energy, not matter. If an object hits a globe there is an inelastic collision and the globe can absorb the object's kinetic energy (its speed).
Moppy wrote: ↑
The generator is able to operate while moving (a ship is always moving with with respect to something) and should be movable from inside the field by picking it up, so long as you don’t use a gravitational drive.
Agreed, there is no absolute reference for position, and hence no absolute reference for movement.
You can move in space, but not while the globe is trapped in a planet's surface.
Moppy wrote: ↑
Edit: but obviously the rules for magic take preference, just wanted to say the device rules are inconsistent but that’s ok. They’re supposed to be.
There is no inconsistency or magic in it's operation, as far as I can see.