Can any aerobatic aeroplane be flown upside-down or do you need +ve G manouvers thoughout
This bit seems to have been missed by most, though some of the answers have touched on it, yes you can fly any aerobatic aircraft inverted and indeed do negative g manouvers to a limited extent, though you
do need to take into account that the engine will stop producing power and will have no lubrication unless it has inverted fuel and oil systems - no inverted oil will be the main consideration here and how long you can stay upside down may well be laid down in the engine limitations - with no inverted fuel the time will be mainly limited by how much height you have spare!