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T-REX 450 › Low speed vibrations
03-18-2009 03:34 AM  8 years agoPost 1
Melnic

rrElite Veteran

Columbia, MD,USA

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I have a heli that was giving me low speed vibrations around 2200-2400RPM.
I had it in a Heliartist 500D fuse and it shook the darn thing to pieces. Cracked the canopy.

I decided I did not like the cheap fiberglass blades I put into it and looked at the balance, the blades were balanced on a teter totter type balancer. I purchased an align balancer and did the finless bob method of balancing the CG first, then the blades. The blancing came out a little bit different.

Flew the heli about 4 flights and could not reproduce the balance issue but not sure if it would show up w/o the heavy fuse on it.
I then pulled the blade grips back off to inspect my thrust bearing assembly after the first crash it had. I found that one of my thrust bearings was assembled incorrectly. I had the bigger end of the thrust bearing on the outside of the blade grip instead of the inside.

I know blade balancing plays a huge part in vibrations but could the thrust bearing assembly have made any difference in a low speed type vibration?

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T-REX 450 › Low speed vibrations
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