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HomeAircraftHelicopterAlignT-REX 600N › Vibration/wobble on spool up Trex 600
02-25-2016 01:34 AM  34 months agoPost 1
ttaylor63

rrApprentice

Floresville,Tx

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Ok i have an older Trex 600LE thats been converted to flybarless. Its been flybarless for 3 years or so now. Motor is a OS 55 Hyper. Align servo's. Total G controller.

When i go to apply power the motor seems to speed up but the blades don't seem to be spinning as much. Also i have a vibration / wobble when blades do get to rpm rite before liftoff. When in air there is some slight vibs in tailboom. I just replaced the tail gear bearings and replaced bearings in motor as well. Blades are new. Hasn't been crashed in a while or so. I'm just a sport flyer no 3D. My dilemma is what is causing the vibration and why the motor isn't spinning the blades on spool up... Any help appreciated..

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02-25-2016 02:08 AM  34 months agoPost 2
artimus

rrKey Veteran

Buckley WA

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I would check your clutch....engine rev up and blades dont spinup with the motor your clutch is slipping you may also have a broken clutch shoe or a wore out clutch liner. If you hear a matialic ringing sound its the liner is gone. Which would also cause the vibrations.

Fly Hard......Team Viagra

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02-25-2016 05:07 PM  34 months agoPost 3
ticedoff8

rrKey Veteran

Morgan Hill, CA. USA

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I agree: Check your clutch / liner / clutch bell first.
The liner does wear out
You may have noticed while flying that a full collective climbout resulted in what may hove sounded like the motor over-reving.
If you run a throttle curve, that was the clutch slipping because the liner is worn out.
If you run a gov, then the motor will not over rev, but you may see that the blades are visibly slowing down while under a heavy cyclic or collective load.

But, I am not sure it is related to the tail vibration.

I would start with the tail rotor hub and work your way forward on the heli.
It is easy to tap the tail blade on the grass and that will tweak the tail rotor hub - they are cheap to replace.
Also, is this is a torque tube, check the TT bearing inside the boom. They wear out too.
Then, the usual suspects: The autorotation gear, the front tail rotor drive gear, the umbrella gears (if TT).

As for the hula dance at takeoff - that could be loose blades (the blade bolt isn't tight enough), the head dampers are worn (allowing the feathering shaft to shift) or a bent main mast.

It could also be the FBL gyro reacting to the vibration.
Any vibration on the airframe is transmitted to the gyro.
And, if the gyro's gain is set too high, and there is a new vibration, it starts to react in a way you haven't seen before.
One area I always look at is the servo wire bundle that leads to the gyro.
If you did a neat and tidy job of routing the wires into a neat a tidy bundle as it connects to the gyro, you have set yourself up for a vibration induced oscillation in the gyro.
The bundle starts to vibrate and transmit that vibration into the gyros case.
I learned that the hard way.

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

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02-25-2016 07:57 PM  34 months agoPost 4
ttaylor63

rrApprentice

Floresville,Tx

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Pulled the clutch bell and there was a lot of play in it. This is the original liner from when I built he kit 5 yrs ago. I remover the old liner. What's a good liner to go back with. The align one blue one. Or is there a better option.

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02-27-2016 03:34 PM  34 months agoPost 5
artimus

rrKey Veteran

Buckley WA

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The align will be the proper size...go with that one

Fly Hard......Team Viagra

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05-12-2016 04:32 PM  31 months agoPost 6
wickedindian

rrApprentice

NY

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motor speed up and blades not reaching rpm

(1) check your clutch bell, clutch liner needs to be change because its not grabbing and you are putting too much strain on your clutch.

(2) the wobble is because u don't have enough headspeed, and that is because of part (1)

If it Ain't Broke........Don't Fix it..

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06-13-2016 02:18 PM  30 months agoPost 7
Richardmid1

rrProfessor

Leeds, England

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After replacing the clutch liner check blade balance and tracking, main shaft, head block loose on main shaft, etc.

60% of the time, it works every time!

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