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08-02-2012 03:29 AM  9 years ago
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rocket_33

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Mount Pleasant, Michigan USA

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Clicking Sound from Auto??
The other day I was flying my ENV and when I landed and it was spooling down, I thought I heard a clicking sound. When I took it back to the bench, I rotated the drive gear in reverse while holding the main blades and I could hear this clicking sound. It was very light but definitely could hear it. It reminded me of the old Schulter heli days where it used a pin and spring on a cam for its autorotation unit instead of a torrington bearing.

Anyone notice this before? It may have been there all along but just noticed it. Thoughts?
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08-02-2012 07:19 PM  9 years ago
OICU812

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Grande Prairie, Alberta, Canada

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Have you removed the OWB sleeve and either put retainer in or grinded a flat spot to the sleeve and grub screw? If not would suggest that, there are many stories of the OWB sleeve spinning and seen it myself, it's not a nice suprise but deal with it now and be done with it....Once upon a time there were Nitros, flybars and frequency pins...
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08-07-2012 03:11 PM  9 years ago
Sky Dancer

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Bryan, Texas

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I rotated the drive gear in reverse while holding the main blades and I could hear this clicking sound.
Yep, I've heard that same sound when using the 4525-520 motor. A couple of flights later the motor quit in flight.

It was the motor bearings coming apart....

Don C
Keep up your rotor speed !
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08-07-2012 03:16 PM  9 years ago
rocket_33

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Mount Pleasant, Michigan USA

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You know you are correct. I happened to notice that it wasn't the auto unit, it was one specific spot on the motor. In fact once I figured where it was, I could move the motor slightly back and forth in the area and hear the clicking.

Dang, better change the bearings out. Worst part is this motor (also a 4525-520) has....are you ready for this....2, yes 2 flights on it. and yes I oiled the bearings

And just when I thought I had everything ready to go to IRCHA. Well will have to look up the size and will replace it with ceramics.
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08-07-2012 03:25 PM  9 years ago
Ejeremy

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Bourbonnais,IL

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If you can't get new bearings by Ircha come find me I have a set of boca bearings for the 4525.

Jeremy
Team Futaba
Team Thunder Tiger
Team Radix
VP Powermaster Fuels
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08-07-2012 11:14 PM  9 years ago
rocket_33

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Mount Pleasant, Michigan USA

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Great thanks. We will be set up at our MMRCHA tent (will see the banner) and you will prob see our snazzy shirts from our May Fun Fly so will be easy to spot me
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08-08-2012 12:24 AM  9 years ago
Sky Dancer

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Bryan, Texas

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Glad you found it....

Sometimes I've noticed a slight tight spot in the gear lash between the main gear and pinion. That, along with the kind of raw power were getting with the 520, can also damage motor bearings pretty quick.

Don C
Keep up your rotor speed !
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