kpjb said:
"Positive G's are OVER 1g. 1G= 1 times the force of gravity, i.e. normal. Avoiding negative G's is acceptable if there are places with ZERO G's... that's the absence of gravity --- air time.
Negative isn't necessary."
That all depends on what your definition of airtime is. Any amount of G's between +1 and 0 mean that the force on your body is still downward, but just less than what you normally feel from the earth. You kind of get a light feeling when you're in the +1-0 range, you float at 0, and you get pushed upward below 0. You could float around at 0, but to get ejector airtime, I believe you have to be below zero.
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Mamba--One of the Tallest, Longest, Fastest Roller Coasters in the World
Adam Rentchler