Enstrom 280 Uncontrollable Yawing

[Skyfox37]

I downloaded the Enstrom 280FX from Simviation and installed it according to directions. On takeoff, the helo gyrates uncontrollably in a 30 degree yaw back and forth. The only way to stop the yawing is to reach 0 knots at altitude.

I am a real life pilot whose first flight was in an Enstrom F-28. I have 30 years experience with Flight Simulator (I have Flight Simulator 2, 2002. 2004. and FSX) and have several helicopters in all of the last three FS versions.

Has anyone else encountered uncontrollable yawing in this Enstrom? If so, how did you correct the problem?