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Aerobatics in helos in general should be left to the bar talk. Doing this stuff without a test pilot and a good insurance policy is not too bright, definately illegal, and not conducive to longevity (to paraphrase Bomber Harris).
Brings to mind the bloke in the ENG MD600 (LA?), last words were something like "watch this" as he attempted to roll the ac in front of friends alongside in a R44.
They got to watch as the ac chopped the tail off mid manouvre, plummeted to earth killing pilot + cameraman.
Kinda ruined everyone's day