Maxwell writes:

Clueless as usual.

A zero-G parabola is a ballistic trajectory; it always involves acceleration
towards the ground (in the direction of gravity) at exactly 1.0 G. That's how
it produces the "zero-G" effect.

This being so, you cannot change the acceleration of the aircraft along the
vertical axis without losing the zero-G effect.

Essentially, if you fire a cannonball next to the aircraft, your aircraft
needs to follow the same path as the cannonball in order to become
"weightless."

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