A long time ago I read a book called “The Book of Truth”, by some psychic type guy.
He said UFO’s fly by negating gravity. When this is done, very little power is required for propulsion. And they had atmospheric resistant metals on the saucers.
But he said humans could not tolerate the high G accelerations, they would implode. The aliens have different anatomy.
FWIW.
Okey-dokey
I think that if you were to somehow negate gravity, you would negate inertia at the same time. In essence, you would be inside your own inertial field or bubble and feel no G force at all. What really intrigues me is the link between gravity and time. From my very naive understanding of it, if one were able to manipulate gravity you would also manipulate time to create a difference in the rate it passes between your separate inertial filed and that of another.