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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Spektrum DSM › Bad engine bearings causing glitches with DSM2 receivers
07-24-2012 11:02 AM  8 years ago
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RLHeli

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Auckland - New Zealand

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Bad engine bearings causing glitches with DSM2 receivers
Hi group,
My Vibe 90 SG has been plauged with glitches for about 1 year and half. It started with heli doing "shaking" on its own, cured with replacing RD1221 with AR9000. But soon progressed to going into safe mode for a split of a second every 4 ~ 5 mins, resolved/masked with replacing ar9000 with RD921. Then this time, it was complete glitching when engine was running. I swapped satellite RX/RX, regulators, back to NiMh, remove gyro, remove gov and nothing helped until I dropped engine and checked bearings.
The bearings were worn but really not that bad. I had worse rear crankshaft bearing in OS50 on my 600N without any issue until the bearing noise got so loud that could not be ignored any further. With bearings replaced, the glitches were gone too but I have a feeling that issue is still there but just not powerful enough to cause glitch. So I am looking at dropping the engine, pulling it apart, replacing bearings every 40 flights! When I cannot even pick up a bit of the grinding noise made by worn bearing?
So my question is how many of you have the same experience as me? I thought 2.4G shall be quite tolerate to this kind of noise? There seems to be something on my mechanic that is amplifying this noise. What this can be? I am very keen to switch brand when this issue surface again next time.
Any thoughts/comments/critics welcomed.

Best,
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07-24-2012 11:45 AM  8 years ago
JuanRodriguez

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The Villages, Florida

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My best guess is that it's not the engine causing the issue but something else....Been there, done that and old enough to know better.....
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07-24-2012 12:51 PM  8 years ago
BarracudaHockey

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Jacksonville FL

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I really doubt bearing noise is glitching a 2.4 (any 2.4) system.Andy
AMA 77227
http://www.jaxrc.com
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07-24-2012 12:57 PM  8 years ago
RLHeli

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Auckland - New Zealand

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Agree. Although running engine is also electrically noisy, DSM2 RXs shall be able to handle these. However, these glitches only happens while engine is running (all throttle range). I even tried removing the plug and cranked the engine but there was no glitch.
These glitches happen at idle too and with different SAT / RX as well as different locations. The last thing I tried before dropping engine was installing a brand new RD721 and idled in my garage but didn't help at all, same sort of glitches.
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07-24-2012 12:59 PM  8 years ago
BarracudaHockey

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Jacksonville FL

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Vibration causing a loose connection somewhere would by my guessAndy
AMA 77227
http://www.jaxrc.com
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07-24-2012 01:13 PM  8 years ago
RLHeli

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Auckland - New Zealand

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Nothing unusual logged in Data Logger...
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07-24-2012 01:13 PM  8 years ago
adamsz06

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Geilenkirchen Germany

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Or a servo wire rubbed through touching the frame...R.I.P. Roman
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07-24-2012 01:18 PM  8 years ago
RLHeli

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Auckland - New Zealand

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Servos have been checked by JR and all wires have sleeves. No defeats visible examing the sleeves. Will do open air flying tomorrow.
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07-24-2012 01:41 PM  8 years ago
KevinB

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Earth

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I would tend to agree on vibration being the problem on some electrical component rather than the bearings themselves causing the interference.

You mentioned changing receivers and sats....did you also change the extensions between the RX and sats at the same time? I've seen those leads go bad.

Dropping the engine helped but was it moving things to drop/replace the engine, OR the actual changing of the bearings? Do you have any wiring running through the engine area that was moved or disconnected for the engine work ? If so, have a REALLY close look at that, and replace if have a spare lying around.

I almost balled up my Fury Extreme last month because the ground wire in my right cyclic servo lead broke INSIDE THE INSULATION just where it exits the servo case. It had wire protection on the lead and the lead showed no damage on the outside. It just showed up when I moved the wiring around....and when the engine was running it showed up as glitches. Luckily it failed completely just as I was getting light on the skids and I was able to drop the heli back down and see the servo not working or I would be still looking for the cause of the glitches ( which are gone now btw ).

KevinB
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07-24-2012 02:51 PM  8 years ago
Four Stroker

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Atlanta

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Switch ?
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07-24-2012 03:38 PM  8 years ago
Stephen Born

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USA

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I recently had a glitch while flying. The heli "jumped" while in hover. Went over the machine and found the satellite wire connecting to the FBL unit was not to specs. One of the three wires had come loose in the connector. It was going in and out of failsafe, as this was causing the heli to jump.

Hope you find the cause.
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07-24-2012 05:31 PM  8 years ago
aerocal

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Central California

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I would lean towards the vibration and loose/dirty connection somewhere.
I would pull each connection apart and clean with contact cleaner.If they dont seem to plug in tightly I pull the individual wires from the plug end and give them a slight squeeze with the needlenose to tighten them up.They do get loose over time and repeated plugging/unplugging.
2.4 is much more immune to outside RF noise but I found it is much more unforgiving to a marginal connector.
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07-24-2012 10:04 PM  8 years ago
RLHeli

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Auckland - New Zealand

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Thank you all guys for sharing. I was so lost and frustrated, your messages brought me back in focus and give me new directions.

To answer a few questions, the bearings in YS 91 SR were replaced. There is one long SAT extension that's been routed through engine bay to the rear of the frame. During the engine work, no wire got disconnected except onboard glow driver leads.

But general senses agreed that vibration and bad connection are the main culprits to this issue. My YS just unfortunately added that required vibrations.

Then again, during the peak of this glitch when even just at idle would send the heli twitching like a piglet, l removed all devices and down to 1 brand new rd721 with SAT, 4 servos (3 cyclics and 1 throttle, strange that tail did not seem to be affected) that just come back from JR bit more than half a year ago, holding rd721 in hand or securing to rx tray but did not help at all.

Shall the issue surfaces again, I will first target the 4 servos that were left untouched. Maybe it is where the bug is hiding.

Once again, thank you all.
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08-03-2012 01:16 AM  8 years ago
RLHeli

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Auckland - New Zealand

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My... My... Another 2 week+ and I think I finally have it nailed. It is the connector pins on one of the SAT that has come undone. Not sure if it is due to engine vibs or it came with dry solders but since I touched up those 3 pins the heli have been running smoothly and connected for 6 flights. Phew...
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08-03-2012 01:37 AM  8 years ago
Stephen Born

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USA

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The pins on the sat. or sat. wires?
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08-03-2012 08:57 AM  8 years ago
RLHeli

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Auckland - New Zealand

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Pins on the SAT pcb, though a lot have commented about the extension wires too.
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08-03-2012 03:05 PM  8 years ago
Stephen Born

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USA

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Yep, same problem as I had.

Here is my thread and findings.

https://rc.runryder.com/t703096p1/
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08-08-2012 11:53 PM  8 years ago
RLHeli

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Auckland - New Zealand

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Yes. Had that same thing happened to one of my Spektrum SAT extension wire too
The wires of Spektrum SAT extension are brittle. JR ones are thinner and more flexible. Nevertheless, this connector and its seat is just not vibration proof enough to be used on nitro engine by my reckoning. A good goop of hot glue has now been applied to these connection points
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08-09-2012 01:40 AM  8 years ago
Discharger

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Perth, Western Australia

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"a lot have commented about the extension wires too."

The micro connector plug and socket contacts on the satellite cables in my opinion should be gold plated to prevent corrosion. I've experienced quite a few intermittent problems with these connectors requiring unplugging and cleaning.
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08-09-2012 01:50 AM  8 years ago
Stephen Born

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USA

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Amazing the satellite wires and connectors are so fragile. If you lose signal you lose the bird.

A lot is riding on them.
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HomeRC & Power✈️Aircraft🚁HelicopterRadio - Spektrum DSM › Bad engine bearings causing glitches with DSM2 receivers
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