Does the name Denis Kenyon ring a bell anywhere?
Those of us who have been around the UK rotary world over the last 15 or so yrs will know of this extraordinary man and the even more extraordinary things he can make an standard piston Enstrom do (don't laugh, it's one of the strongest and most agile machines around).
His displays at Helitech are a mind boggling series of impossible low altitude maneuvres that make the military displays look utterly tame.
Aerobatic is, I believe, defined as over 30' roll or pitch which is pretty ornery, the magnificent Whales (bigger and greyer than Sharks) ripped that definition up in a 3 ship formation in the early '80s. DK's displays (solo) go at least 3 times over those parameters, I never saw a military helo pitch to 110' nose down at 200'agl and roll 360' in the vertical before pulling out at zip feet agl to pitch right into a vertical torque turn....up and down...
Aeros in helicopters? You'd better believe it!
I never got anywhere close to those attitudes in Hughes 500 and Gazelle and God knows I tried, at a safe altitde. There are still Giants walking this Earth!!