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 Post subject: [Solved] High Vibrations
PostPosted: Sat 26. Mar 2016 15:47:13 
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Joined: Sat 05. Mar 2016 18:14:50
Posts: 8
Hello,

I have a Goblin 380 and the Spirit FBL and I haven't been able to sort out some tail wag that I have no matter what headspeed/tail gain I run, even with the speed up tail pulley.

So today I did some tinkering with the Spectrum Analyzer and found something interesting. My tail (Z Axis) is showing massive vibrations (316-350), and vibrations of about 63 on my X Elevator axis, with 9-15 on my Y Aileron but when I disconnect the tail belt from the main shaft it goes below 20 on all three axis.

Attachment:
File comment: This is the Z (Rudder) axis running as "normal."
Z axis.png
Z axis.png [ 96.51 KiB | Viewed 793 times ]


So I'm pretty sure the vibrations are in the tail, but I wanted to check with you guys and see how you would proceed and what I should be looking for.

Steps I've taken:
1) Remove tail blade grips - No change
2) Remove Pitch slider - No change

Because of how this heli is designed, if I remove the tail shaft I can't rule out bearings, the supports that hold the bearings, or the tail pulley.

My guess is that it is the tail shaft, but I just want to make sure I'm on the right track and the figure out the best way to trouble shoot the problem.

Thanks,
Nathan


Attachments:
File comment: This is the Elevator with the tail belt still attached.
x Elevator.png
x Elevator.png [ 39.52 KiB | Viewed 793 times ]
File comment: This is the Z (Rudder) axis with the tail belt detached from the main gear.
Z axis no Tail.png
Z axis no Tail.png [ 20.92 KiB | Viewed 793 times ]


Last edited by Swift Phantom on Sat 26. Mar 2016 18:17:26, edited 1 time in total.
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 Post subject: Re: High Vibrations
PostPosted: Sat 26. Mar 2016 18:16:59 
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Joined: Sat 05. Mar 2016 18:14:50
Posts: 8
I found the issue. I had installed SAB's belt tensioner and while spooling up I was looking over the heli and noticed that the tensioner was jumping around a bunch, so I took it off and everything is below 20 on the whole heli.

Even though it's been a lot of trial and error, I'm really enjoying the Spirit. Can't wait to get it fully tuned!


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PostPosted: Sat 26. Mar 2016 23:44:15 
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Joined: Mon 29. Apr 2013 16:06:44
Posts: 12442
Perfect you have found it.

In case of any question feel free to ask.

_________________
Spirit System developer


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