Dear Gheghis
In my opinion it may not be as simple as it sounds. The helicopter design philoshy is based on its intended use (performance envelope). It has been observed in most of the helicopters which I had flown that there was sudden deterioration in the performance when reaching at the edge of its flight envelope. This was either because of the engine design(thermal/power margin) or because of some airframe related(Rudder/control margins).
regards and happy hovering