Intruder
While you might get pendantic about his use of the word "axes" in context, a proper barrel roll is done in 3 dimensions. The visual reference is a point/object at or slightly above the horizon approximately 45 deg left or right of the nose. The object is to keep that point stationary on the canopy/windscreen as you "roll around"
The first usable description of a true barrel roll. And now the 1g barrel roll people please explain, how you are going to do that with a constant 1 g.
Dont ask, i know how barrel rolls are flown, not in transport aircraft but in jets. I can count at least one thousand of them and either did all of them wrong as not a single one was a contant 1 g roll
or itīs just my old memory which plays tricks on me
Watch my smilies, its a funny discussion.
franzl