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jburg · 01-11-2017, 03:08 PM

Looking for some suggestions on finding the source of head vibration on a generic 450 heli I have been playing with. As I'm throttling up the head shakes like crazy and is giving the FBL controller fits. Appears to smooth out some at full RPM, but I'm sure its still there. I've weighed and balanced the blades, it has a new straight main shaft. Its a new FBL head (not Align).
Funny, I have another generic 450 that I've crashed the piss out of learning to fly, frame is bent.....but It's the best flying 450 I have!! But this newer version just shakes, rattles, and rolls.
Suggestion?

don batman · 01-11-2017, 06:27 PM

Main Shaft bearings could be worn , allowing the main shaft to wobble.
Just went through this on my old EXI 450.
New bearings helped quite a bit with my head vibration.

RaisedByWolves · 01-12-2017, 09:18 AM

Did you actually check the new shaft is straight?

Double check that and the feathering shaft as well as the blade grip assemblies for proper assembly.

jburg · 01-12-2017, 06:37 PM

This machine barely has an hour on it so I hope the bearing are still good. They seem tight and smooth. I always check the flatness of the shaft. But I have not investigated the feathering shaft, that I will work on next.

Thanks.

PilotPin · 02-03-2017, 08:06 PM

Don't have the blades overly tight . Check that the main bearing have a good fit on the shaft and there holder.

01-11-2017, 03:08 PM	#1 (permalink)
jburg Registered Users Join Date: Aug 2011	Generic 450 vibration Looking for some suggestions on finding the source of head vibration on a generic 450 heli I have been playing with. As I'm throttling up the head shakes like crazy and is giving the FBL controller fits. Appears to smooth out some at full RPM, but I'm sure its still there. I've weighed and balanced the blades, it has a new straight main shaft. Its a new FBL head (not Align). Funny, I have another generic 450 that I've crashed the piss out of learning to fly, frame is bent.....but It's the best flying 450 I have!! But this newer version just shakes, rattles, and rolls. Suggestion?

01-11-2017, 06:27 PM	#2 (permalink)
don batman Registered Users Join Date: Nov 2015	Worn Bearings ? Main Shaft bearings could be worn , allowing the main shaft to wobble. Just went through this on my old EXI 450. New bearings helped quite a bit with my head vibration.

01-12-2017, 09:18 AM	#3 (permalink)
RaisedByWolves Registered Users Join Date: Nov 2015	Did you actually check the new shaft is straight? Double check that and the feathering shaft as well as the blade grip assemblies for proper assembly. __________________ Sponsored by Team Gravity!! Keeping replacement parts vendors in business since July 2016.

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01-12-2017, 06:37 PM	#4 (permalink)
jburg Registered Users Thread Starter Join Date: Aug 2011	This machine barely has an hour on it so I hope the bearing are still good. They seem tight and smooth. I always check the flatness of the shaft. But I have not investigated the feathering shaft, that I will work on next. Thanks.

02-03-2017, 08:06 PM	#5 (permalink)
PilotPin Registered Users Join Date: Dec 2015 Location: Indiana	Don't have the blades overly tight . Check that the main bearing have a good fit on the shaft and there holder.

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