Observer is overspeeding on descent

[heliplt]

Ok this may sound stupid but here it goes, I use a Bergen Observer for my AP business and the thing flies very smooth with no vibes at all but one thing has been bugging me about it. When I descend from shooting altitude, say 100 feet or more the head sounds like it is over speeding .
At the same time you can also hear the engine RPM come up almost like the clutch is still engaged .

Any advice would be appreciated

[cbergen]

Adjust your pitch and throttle curves to reduce this.

What is happening is you're reducing the pitch faster, or more than, the throttle. Reduce the throttle in the descent, leaving the pitch up a little bit.

When you descend with overspeed, you're also "unloading" the head and the engine, which will give you vibrations during the descent. What you want to do is to keep the head and the engine "loaded" at all times, even while descending.

[heliplt]

Thanks for the heads up Chris, I'll tweek it this week end and let you know how it goes.
Now that I think about it that idea makes perfect sence :noteworthy

[cbergen]

Wish I could lay claim to this little tidbit of info, but this is my take on it from listening to people like Bill Meador, Gary Travis, and my father.

[heliplt]

Thanks ......again for all of your help Chris.

Oh , nice muffler , sounds like a 60 size glow heli now..... Very quiet . :smokin: