Originally Posted by gums
We are talking about the aircraft reference frame for one gee. That's down from your brain thru your butt if you are not at Creech AFB flying a Predator drone 10,000 miles away, heh heh.
If your plane is not "level" that could lead to a 1g through the butt accelerating auger in situation. (Although you'd be going gosh almighty fast pretty quickly.) Nose down and accelerating could end up feeling like one g through butt.
(And I'm only mildly surprised the Predator pilots don't have motion base chairs to simulate what the plane feels. One industry I do work for dotes on that sort of stuff as means of separating rubes from dollars. It's convention is in Orlando just before Thanksgiving.)