Originally Posted by
Goldenrivett
When inverted, the lift direction would have to be towards the belly (not the roof).
If you are in straight & level inverted flight, yes. But if you are pulling through (say, from the top of a loop) then you will have a *positive* AoA and pulling harder will lead you into buffet and even potentially flicking out of the loop.
If you do a round loop in a low-powered aeroplane (Tiger Moth, Stampe etc) then as the speed decays over the top of the loop you will be backing off the pull and may well get zero-G (or close to it). You will certainly get "reduced G", and that means that the stall-speed reduces accordingly. I've been in unstalled flight at 18kts (according to the ASI) through the top of a loop in a Stampe, but I wouldn'd want to try that as an approach speed...
