SASless,
Doing anything but straight and level with moderate turns in a teetering rotor is taking a chance. The control is so very much dependant on maintaining positive G that any screw-up makes the situation a real catastrophe.
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).
Nick
