So finally it remains questionable what _strange_ results are. For me, being a aeronautical engineer, commercial fixed-wing flight instructor and occasional helicopter student pilot, TOH's flight model is _completly_ strange. And, yes, X-Plane comes close to the real thing, FSX/FS9 is crap.
And a helicopter is a dynamically instable, but not chaotic system which can in its parametric form be solved with no difficulty on any computer... ;-)
Anyway, my goal was not to insult those who are happy with it. The OP just asked....
Best Regards
Kai