The Eurocopter BO-105 CBS 4 twin engine helicopter with a Rigid Rotor system can do some amazing aerobatics. Stock model with a Rigid Rotor system, the fixed rotor is why it can do aerobatics.
"This is an unnatural way to fly a helicopter. The pilot... Chuck Aaron, built 2-3 Cobra helicopters from pieces and parts and now flies for Red Bull. He sez there is more $$ in acrobatic flying than rebuilding aircraft. I think he just got tired of the rebuilding hassles."
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