I know it's a bit late to say this now, but during the loop it would have been cool if you had had a G-meter (there are doubtless many free smartphone apps that do it) in shot, to show the normal 1G in level flight, then dipping as the pilot dived and increasing through the loop.  The bottle of water trick is doing the same thing but a G-meter has the advantage of showing magnitude as well as direction.<br><br>Also, totally with you on how unpleasant low-G manoeuvres feel :),(reply>), @Bruce Duncan Ah- I wasn't expecting that response!  I see it now, though it's hard to pick out if you don't know where to look.  Also, 4G is more than I was expecting (and explains why Tom reacts quite so strongly),(reply>), +PKMartin We did have a g-meter. It's on the lower right of the instrument panel, just below the camera. The loop peaked at around 4 G.