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Thunder Tiger Electric Helis Mini Titan E325, Raptor E550 and E620 SE Helicopters


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Old 07-05-2012, 08:59 PM   #1
scottward
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Default Mixer Arm bearings

Hi Guys,

Just wondering, those little bearings in the lower and upper mixing arms, they'd be getting a pretty good workout wouldn't they?

I doubt any maintenance is really required on them (e.g. oiling), better to just replace them when required?

But, how to know when required?

I'm thinking that the best way to check these little bearings would be to remove the mixer arm from the heli, and put a firm fitting shaft of some sort into the bearing, then give the bearings a tilt on the shaft to see if there is any play. If there is play, they need replacement.

The reason I ask is that last year my heli starting wobbling a bit, intermittenly.

I put new mixer arms on last year (platic to metal) and the problem went away.

Just recently the same issue has cropped up again, and although nothing else has changed, no crashes etc etc, I'm suspecting that perhaps it's these little mixer arm bearings???

Also, I recall some discussions about gluing the outside of the bearings into the mixer arms (perhaps only relevant to plastic)?

Thoughts?

Scott.
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Thunder Tiger Mini-Titan V1
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Futaba GY401 + S9257
Scorpion 2221-8 V2 motor, Castle Creations Ice 50 ESC
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Old 07-09-2012, 03:00 AM   #2
scottward
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Any takers?
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Thunder Tiger Mini-Titan V1
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Futaba GY401 + S9257
Scorpion 2221-8 V2 motor, Castle Creations Ice 50 ESC
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Old 07-09-2012, 06:39 AM   #3
B335
 

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You could check for play in the mixer arms by just manipulating them with your fingers. These should be on your pre-flight checks anyway (check all items for slop).

I'm on mixer arms that have been on there 2yrs+ with no play.
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Old 07-09-2012, 09:05 PM   #4
scottward
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There should be absolutely no play whatsoever correct?

If there was play here, this could cause in flight wobbles?

Thanks for the help.
Scott.
__________________
Thunder Tiger Mini-Titan V1
Futaba 2.4G 7C, Futaba S3153 cyclics
Futaba GY401 + S9257
Scorpion 2221-8 V2 motor, Castle Creations Ice 50 ESC
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Old 07-10-2012, 05:50 AM   #5
B335
 

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Correct, no slop/play on any parts. Tracking would be one issue, yes.
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Old 07-11-2012, 05:26 AM   #6
scottward
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Cheers B335, I will check it out......
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Thunder Tiger Mini-Titan V1
Futaba 2.4G 7C, Futaba S3153 cyclics
Futaba GY401 + S9257
Scorpion 2221-8 V2 motor, Castle Creations Ice 50 ESC
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Thunder Tiger Electric Helis Mini Titan E325, Raptor E550 and E620 SE Helicopters

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