Beagle,
Couldn't agree more. A text-book barrel roll has a level axis. At low level the axis must be inclined (upwards!). Almost learned that the hard way. Look what happened to the guy (incipient alzheimers forgotten his name - probably a good thing) who got it wrong in an Invader at Biggin way back in time. I have always thought the barrel roll to be the most dangerous manoeuvre at low level. Just slightly ahead of a real Derry turn.