A simple question from a mere support numpty. Does it matter anymore, at all ? It's gone, grounded, never to fly again. The manoeuvre was apparently not done as part of a public display, possibly a salute to Mr Falks initial introduction of the aircraft, way back then. It's a damn shame that so many are so litigious, and PC about what was once conceived as professional and controlled enthusiasm. I always thought that a barrel roll involved a maximum 1G through the procedure. I'm no professional aviator, so please don't waste a post jumping on me, I merely offer an opinion from someone who once enjoyed our military aviation fraternity, though the sarcasm and self righteousness is becoming fairly tedious.
Smudge