mike regish writes:

Uhh..hate to burst your bubble again, but -1 g would have you straining at
your seatbelt with a force of 1 g.

+1 G plus -1 G equals 0 G. In the zero-G state, you're accelerating downward
at 1 G, thus -1 G vertically. Since the acceleration due to gravity is +1 G,
they cancel, and the result is weightlessness.

If you're not wearing one, you would be
exerting 1 g against the roof.

You'll want to heavily pad the entire cabin, anyway, since the return to the 1
G state (and often higher than that, since you must pull out of the parabola)
can be abrupt.

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