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130X Blade 130X Helicopters Information and Help


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Old 07-10-2019, 08:40 PM   #1 (permalink)
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Default How to tell which bearing is going south?

Testing a 130X after a few repairs, all seemed ok, when I developed a tail vibration literally,. midway through a test flight.

I cannot find any other obvious faults, so am guessing that I lunched a bearing. But which one? There are three bearings in the tailcase, plus the slider bearing.

Before I just start replacing parts, is there any way to tell which bearing is shot? Or does anyone have any other ideas what might be wrong?
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Old 07-11-2019, 12:24 PM   #2 (permalink)
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If I ever develop a tail vibe without a crash I always check the tail shaft collar first. If it moves even a little bit it will allow some play.
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Old 07-11-2019, 03:10 PM   #3 (permalink)
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Will investigate this.

Much appreciated.
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Last edited by Mrowka; 07-11-2019 at 03:22 PM..
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Old 07-11-2019, 08:32 PM   #4 (permalink)
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Quote:
Originally Posted by Chris1683 View Post
If I ever develop a tail vibe without a crash I always check the tail shaft collar first. If it moves even a little bit it will allow some play.
Shaft collar appears pretty tight, BTW.
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Old 07-12-2019, 02:18 PM   #5 (permalink)
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Also, I replaced the slider bearing and two of the three tailcase bearings, but this didn't fix the problem.
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Old 07-12-2019, 03:02 PM   #6 (permalink)
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To confirm, the vibration is during flight? Typically I’ve seen the vibrations on spool up and down if there are any. If it’s during mid-flight I would also check the tail blades and make sure the blade grip screws are tightened enough.
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Old 07-12-2019, 04:52 PM   #7 (permalink)
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Do you get a buzzing sound with the vibration ?
If so the torque shaft could be whipping inside the tailboom.


A slight bend or too much pressure due to too tight of gear mesh could be the culprit.


HW.
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Old 07-15-2019, 01:39 PM   #8 (permalink)
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Quote:
Originally Posted by Chris1683 View Post
To confirm, the vibration is during flight? Typically Iíve seen the vibrations on spool up and down if there are any. If itís during mid-flight I would also check the tail blades and make sure the blade grip screws are tightened enough.
Vibration is midflight.

Quote:
Originally Posted by Heliwhisperer View Post
Do you get a buzzing sound with the vibration ?
If so the torque shaft could be whipping inside the tailboom.


A slight bend or too much pressure due to too tight of gear mesh could be the culprit.


HW.
I don't recall a buzzing sound (other than the sound you normally get when the tail is vibrating) but will check.
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