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HomeAircraftHelicopterThunder TigerOther › rx interference from failing bearing
02-10-2006 05:06 AM  12 years agoPost 1
BJames111

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San Diego, California

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Is it possible for a pcm lockout to occur due to a failing bearing? I am having major issues with my 90SE, in that when the engine is running, the servos will "lock" in a certain position, but only for a moment, a short moment. It's enough that it could cause a crash. The weird thing is, it just started all of a sudden...why?

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02-10-2006 05:15 AM  12 years agoPost 2
Invrted1

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Cincinnati, Ohio

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Bad bearings can cause severe RF interference, it would not suprise me to find you have one in there somewhere.

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02-10-2006 05:26 AM  12 years agoPost 3
BJames111

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looks like I'll be checking bearings then...

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02-10-2006 05:46 AM  12 years agoPost 4
Invrted1

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Cincinnati, Ohio

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When in Doubt, Change it Out!

Seriously though, this could be a power problem too, a voltwatch type thing can help diagnose that, and they make one now that counts glitches (won't matter with PCM) and records lowest voltage during the flight.

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02-10-2006 06:08 AM  12 years agoPost 5
BJames111

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San Diego, California

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I've got a volt watch, and i've been doing testing like 6 inches from the ground so I can watch the led's. Plus If I bang the sticks around, voltage doesn't drop...I can see voltage on my gy611.

change it out? what do i do, change them all? if they feel fine, no notchyness, they're probably fine right? The bearings I mean.

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02-10-2006 06:28 PM  12 years agoPost 6
Tron

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Morgan Hill, CA

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I'd start with the bearings supporting the starter shaft. Then I'd look at the 1 way bearing in the clutch itself and see how the starter shaft fits. I had wear in the clutch one way and starter shaft fit that produced glitching. Changed out the clutch and the starter shaft and it went away.

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02-10-2006 06:29 PM  12 years agoPost 7
BJames111

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San Diego, California

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thanks tron...

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02-10-2006 06:36 PM  12 years agoPost 8
Doug

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Port Saint Luice Florida....

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I would swap in an known good receiver as a first step. as a "bad board/edge connector will give the symptom's you describe.

First member of Member of Bearings Anonymous

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02-10-2006 08:24 PM  12 years agoPost 9
lightningrc

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UK

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Yes ive fitted 2 sets of the bearings supporting the starter shaft and clutch bell .
We need an upgrade for this with different bearings and a better starter system

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02-11-2006 12:24 AM  12 years agoPost 10
zipphreak

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Attleboro, MA

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If you happen to have any servos with metal gears, over time they tend to get sloppy and can cause some interference as well. One of my flying buddies at the field had a 90se with severe interference ghosts, he pinpointed it to one of his servos. He went through lots of new parts trying to figure it out.

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02-11-2006 03:27 AM  12 years agoPost 11
Sign Guy

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Las Vegas, NV

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We had a guy go in at our field from what appeared to be bearing harmonics causing lockout

Better to have tried and failed than to never have tried at all!!

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02-11-2006 05:21 AM  12 years agoPost 12
BJames111

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San Diego, California

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I'll try a different rx this week.

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02-11-2006 01:05 PM  12 years agoPost 13
3dmon

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Sebastian, Florida USA

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Heres another idea.

I had the same sorta problem. I found out my battery had a bad weld joint, and the vibrations were hitting the battery and making that little tab go back and forth which gave me terrible glitches.

I replaced all sorts of stuff just to find out it was the battery.

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02-11-2006 01:19 PM  12 years agoPost 14
Itsindilas

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Greece-Athens

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I faced suc an experience in the past. It was due to a faulty bearing in the R50s clutch bell. Fortunately, a RR member advised me to check it, eventually e specified what to check.


Cheers

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02-11-2006 04:30 PM  12 years agoPost 15
BJames111

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San Diego, California

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I think the clutch bell bearing is the most famous culprit. I'll change that out first, (it should arrive monday), and go from there.

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02-11-2006 06:37 PM  12 years agoPost 16
Itsindilas

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Greece-Athens

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Go step by step. At first change the clutchbell bearing and then test it. In the past I had a GPH346 and I faced major glitching due to static current. Finally I grounded tail boom with main frames and glitches stopped. It was a belt driven tail. In your case, if you use a carbon tork tube for your tail, you may have to ground tail boom as well. Check the block whre boom enters the main helicopter. In case it's a metal one, you may not need to ground it. In case it's made from plastic you may have to gorund it.

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02-11-2006 07:58 PM  12 years agoPost 17
w.pasman

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Netherlands

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Anything metal vibrating against metal can cause radio noise. Bearings no exception. But also check for other loose metal parts and screws.

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02-12-2006 01:49 AM  12 years agoPost 18
BJames111

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San Diego, California

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I got my new bearings, I'm going to change them out along with the starter shaft. I got some wood 680's and some plastic tail blades just incase i smash it in while testing tomorrow.

Wish me luck

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02-12-2006 03:48 AM  12 years agoPost 19
BJames111

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San Diego, California

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well, I changed out the bearings and the starter shaft. The bearings were REALLY dry. I hope this is the issue. I HATE dorking it in because of stuff like this.

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02-12-2006 08:27 PM  12 years agoPost 20
BJames111

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San Diego, California

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problem seems to be gone. 2 successful flights, no lockouts.!!!

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