There are other kinds of quack science, but in this area, anything that seems to contradict the basic laws of motion and/or conservation of energy is recognizably quack science. Especially when doing so experimentally first (instead of first coming up with a theoretical/mathematical framework). Even especiallier when using electrical effects in Earth's magnetic field and measuring minute effects.

Where did quantum mechanics come from [1]? Where did general relativity come from [2]? They came from _experiments_ and _observations_ that couldn't be explained by the current theories. You don't just take theories to produce experiments (though this can happen to verify or to gain accuracy) - usually it works the other way around. Experiments are done to power new theory. Except a growing number of people are becoming content as you are in the existing theories because it is costlier now to probe the edges of our theories than it used to be. There are major problems though even in established theory [3].

I'm not an expert in general relativity, but there are some major unknowns (and in fact known problems) with it and to assume that our current interpretation (because as far as I can tell, the issue is mostly with the interpretation of inertia rather than the actual formalization of gravity itself) is 'correct' is just so arrogant and counter-productive. Does that mean all fringe ideas should have money poured into them? Certainly not. But if we have no funding going into experiments differing from the 'consensus', that's the surest possible approach to guaranteeing the consensus never improves.

[1] https://en.wikipedia.org/wiki/Double-slit_experiment [2] https://en.wikipedia.org/wiki/Tests_of_general_relativity#Pe... [3] https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_p...