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04-02-2013 01:54 PM  6 years ago
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KevinB

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Earth

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Static question
Hello.

I just finished doing a boom stretch conversion on an Embla450. On the initial test flight I had a massive glitch on all the controls at once halfway through the flight. When I checked the Vbar log, it showed Sensor connection broken, Elevator sensor out of range, Aileron sensor out of range, Tail sensor shows no signal, Governor signal shows glitches. When bench testing (with no blades on), I could occasionally replicate the incident and the log entries.

It's a full size Vbar, so I first tried a different sensor, and it still glitched on the bench after running for a while. Then I tried a new main unit and sensor....same thing.
The upgrade involved a carbon boom and the Embla has a plastic boom block and carbon frames. I installed a ground wire between the boom and the carbon frame and so far, have not been able to replicate the problem again on the bench.

Can static discharge alone create the kinds of log entries listed above? I was lucky to save it the first time so I want to make sure I've found the problem before the next fight.

Thanks!

KevinB
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04-02-2013 01:59 PM  6 years ago
Ronald Thomas

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Gainesville, Fl, USA

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Yes it can, go from the rear of the boom/tail case --->to the front of the boom-----> motor mount. Also make sure your connections to the VBAR are solid......RonTeam MikadoUSA 480XXTreme, 550SX, 600SX, 700XXTreme, 800XXTreme!!
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04-02-2013 08:48 PM  6 years ago
BobOD

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New York- USA

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Can static discharge alone create the kinds of log entries listed above?
I beleive so, yes. I've also seen those entries result from metal to metal rubing. In that case probably rf noise rather than static but similar issue.
It does surprize me that you're not getting checksum errors though. Not having checksums may not say it's not static but it raises some question so check everything thoroughly.
Team POP Secret
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04-03-2013 01:02 AM  6 years ago
KevinB

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Earth

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BobOD,
I had a few checksum errors during one round of bench testing before I added the grounding strap. I didn't have any checksum errors during the flight with the big glitch. Just complete loss of control .
The sensor is mounted on the boom block and it's wire is fastened to the frame. I'm guessing the static dicharge travelled this route and wiped out so much of the sensor signal that it thought the sensor was disconnected. It didn't even try to do a checksum test as there wasn't any meaningful data to test on??

laughingstill,
The heli is mostly metal and quality carbon. Just by adding the one "jumper" to get across the plastic boom block, I have full continuity (using a multi meter) from the rear spacer of the tail rotor output box to the shaft of the motor. Since I added the static strap, I've run it through three batteries on the bench and have seen zero errors in the logs. I'll run through three more and if it's still completely error free, I'll do another test flight.
Personally, I think I've solved it, but after the wild ride of the last flight, it's going to take a little flight time until I trust it again.

Thanks for the feedback guys.

KevinB
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04-03-2013 01:29 AM  6 years ago
BobOD

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New York- USA

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It sounds like you got it.Team POP Secret
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04-03-2013 04:23 PM  6 years ago
cudaboy_71

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sacramento, ca, u.s.

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My 600SE required this:
http://www.readyheli.com/MIK4358-Mi...et_p_37134.html

Before it would fly glitch free. Same issues as you with sensors out of range, etc. Static is very much a real issue.
if it ain't broke, break it.
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