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Mikado V-BAR Mikado V-Stabi/V-BAR Flybarless System Software and Hardware Support


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Old 04-26-2013, 01:53 PM   #1 (permalink)
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Default Serious problems... Please see my log!

My Raptor G4 suddenly started twitching on the cyclic today, and when I autoed it down and landed, the sensor light was constant red...
Rebooted and flew fine the next flight...

Please see my log. I think it must be on page 12.

I also got gov issues and a lot more NEED HELP!!!
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Old 04-26-2013, 02:49 PM   #2 (permalink)
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after page 12 you still has had many problems, like a brownout and several ''extreme vibration level''.
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Old 04-26-2013, 03:07 PM   #3 (permalink)
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Yes, lots of problems here...

The G4 is new, and only got 6 flights on it, but the V-Bar has been used for almost a year in my TRex 700N. I had on one occation this winter the same issue with the 700N. Suddenly mid flight the swash servos startes twitching, and I had to auto a twitching heli (luckily I managed to land with no damage) after landing, the servos was twitching until I unplugged power. When I plugged back in, no twitching.

What can cause this? And how can I search for the source for the failure?
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Old 04-26-2013, 06:30 PM   #4 (permalink)
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Default Re: Serious problems... Please see my log!

Looks like a possible brown out issue

Usually when u have a power issue your servos will randomly twitch. I've seen this a few times with power hungry servos like jr and savox.

You can try replicate this by pushing the swash down for 10 seconds (watch ur hands use a object if possible)

Another way is using a small plane bec powered by a 2 cell lipo.
If the sevos randomly twitch like you saw then you know your problem.

How do power your Vbar system?

If it were me personally I'd send it back to have the sensor be checked to be on the safe side,



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Old 04-27-2013, 01:35 AM   #5 (permalink)
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Thanks for the reply Phil!

Ill try pressing the swas like you said.

Im running BLS451s on unregulated LiPo, and my Spektrum telemetry sensor reads the RX pack. I still had like 7.8 volts or so, and minimum was 7.3, These values are still higher than a BEC running on 6 volts...
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Old 04-27-2013, 01:40 AM   #6 (permalink)
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Sending it back is not very tempting...I got a brand new Raptor and we have just got temperatures over freezeing point, so I want to fly!! Ill at least try to figure it out first.
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Old 04-27-2013, 02:10 AM   #7 (permalink)
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After pressing the swash down for 10 seconds, the elevator servo (back servo) died, and after another 10 seconds with VBar still under power, it suddenly snapped back to life... ?
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Old 04-27-2013, 02:20 AM   #8 (permalink)
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Default Re: Serious problems... Please see my log!

I had servos stop on the bench when using an esc's internal bec from pitch pumping. The vbar was still active.
Added a properly rated external bec and it's fine.
Doesn't sound like you're receiver pack is up to the job.
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Old 04-27-2013, 04:52 AM   #9 (permalink)
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I run straight 2s 3300mAh 25C CX g3 LiPo from Hyperion. Weird if they go below 4v just running some Futaba servos...
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Old 04-27-2013, 05:04 AM   #10 (permalink)
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I now switched one rx input port on the vbar from aileron to AUX, and could not get the servo to die after pressing the swash down for 10 seconds.

Ill take the chopper to the field today and fly safe and check the log when I get back.
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Old 04-27-2013, 08:05 AM   #11 (permalink)
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i'm not used to a battery energizing the electronics directly. how many amps can this battery provide in a peak? i'd try an external bec if i could and a bec cc pro would be a good choice to me. i'd feed it directly from the main battery (what isn't necessarily the safer way). i run a 2s battery on the bench while repairing the heli. sometimes i had the swash twitching as this battery was running out of power and in many cases the electronics blackouted completely. a blackout can happen to you in flight and you won't be able to do a thing after that.
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Old 04-29-2013, 05:50 PM   #12 (permalink)
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Ok, my RX pack looks to be worn out, hence the brownout.
My motor was way rich on a very windy day, propably reason for gov high message.
Switched from 2 layers of tape to PU Gel and zip tie.

G4 was amazing today

Will check log and report back soon.
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