That 'crest the hill inverted' trick is insane... They do it because following the contour of the hill while flying right sire up would result in too many negat

That 'crest the hill inverted' trick is insane... They do it because following the contour of the hill while flying right sire up would result in too many negative g's. By flipping inverted, the g-force is now 'down' (relative to the pilot) and they can pull a lot harder (since the body is much better at dealing with g-foreces in that direction).