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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsV-Bar › Vbar problem , pls help! (weird floaty behavior)
04-03-2013 03:58 AM  6 years ago
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orentClass

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new york, NY

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Vbar problem , pls help! (weird floaty behavior)
Well tried asking this in HF forums with no luck. Perhaps you guys could give me some insight.

Been having this weird issue with my vbar silverline. Heli flies perfect when issue is not there but once in a while I get a weird behavior. I'm flying fusion 50 with ds610's on cyclics. Sometimes while hovering I would give aileron or elevator input, the heli would start to tilt in that direction. I would let go of the sticks but the heli would continue in that direction. So I would have to compensate in the opositw direction and same thing would happen. Gives a feeling as if te heli is floaty from side to side or as if it's rocking around. I would then have to land and restart the vbar and the problem would go away. Well lately the problem started appearing more and more and would stay there after the restart. Very frustrating as I would expect the heli to hold it's position in hover. When you give a command and let go of the stick the heli should stop tilting in that direction. Here with this issue it won't stop until I would compensate in the other direction.
Please let me know if you ever had this with vbar. I'm using spectrum satelittes with JR 9503 radio and thought perhaps this could be some spectrum glitch.
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04-03-2013 01:57 PM  6 years ago
bkervaski

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Birmingham, AL, USA

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Very frustrating as I would expect the heli to hold it's position in hover.
Definitely won't do that, the VBar isn't an autopilot type system, it's just a 3 axis gyro (with a really refined control loop), the heli will move around.

When you release the sticks from a right aileron the heli may come back to center but it will need an opposite correction to get it to stop and into a stable hover.

With that said, vibrations will contribute to the heli moving around more on its own. If the sensor is moving because of a resonance (bad bearing, something out of balance, etc) the VBar will think a correction is needed and feed a tiny input. So check all your bearings, check for loose parts, check to make sure your motor bearings are smooth as can be, check for wire chafing, etc.

Also, very important, check your CG.

Lastly, isolate your sensor wire away from EVERYTHING, at least for troubleshooting purposes. The SilverLine sensor is much better at handling vibrations but Mikado switched to a much smaller gauge wire which may be more susceptible to EMI (usually generated by bad bearings).
Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels
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04-03-2013 04:07 PM  6 years ago
orentClass

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new york, NY

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i know its not a stabilization unit, i explained that part wrong. What i meant is when you give heli the commands and the heli tilts along the commanded axes as you would let go of the sticks the heli should stop to tilt, thats what i meant. In my case as I let go of the sticks the heli continues to tilt along the axes until i have to compensate in the other direction and so it would start to go the other way until i have to compensate again, it doesnt hold.

As soon as its starts to do that I have to immediately land and restart the vbar then the problem goes away, but lately it would still be there even after restart.
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04-03-2013 04:10 PM  6 years ago
3dgimble

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Rochester

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Could be vibes, or may have to start setup all over because servo drifted in frames.
Better yet, get a Skookum 540
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04-03-2013 04:58 PM  6 years ago
bkervaski

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Birmingham, AL, USA

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I figured as much.

I think your going to find its vibration or high frequency resonance from something like a bad bearing .. also, isolate that sensor wire and double check your CG.

I doubt it could be servo related if it's CCPM and digital servos.

Edit: could also be static, is static a problem on the fusion 50?
Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels
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04-03-2013 08:33 PM  6 years ago
orentClass

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new york, NY

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lol on the skokoom , im faithful to my mikado brothers...however if sk540 had a vib analyzer i would prob consider trading one of my vbars for it.

fusion 50 doesnt have much static since its TT and i usually lube the gears, however the wire is next to bec power wires and servo wires, here take a look....maybe it would help to isolate it but would be tricky

im just wondering am i the first one to ever experience this ?
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04-03-2013 08:39 PM  6 years ago
bkervaski

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Birmingham, AL, USA

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Nope, not the first, my first two silverlines had tail drift .. I had to re-route my sensor wire to get it solid, was too close to my torque tube transmission (Synergy E7).

Two different helis, only change was blueline to silverline, so I naturally blamed the smaller gauge wire.

The good thing about the silverline though is that you can crank the gains WAY up, its definitely a better sensor.
Team Synergy Factory Specialist / Scorpion / Thunder Power / Byron's Fuels
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04-03-2013 08:47 PM  6 years ago
orentClass

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new york, NY

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oh yes i had a tail drift too which was the new CF tail blades i put on but i fixed it some what however this aileron/elevator axes movement after sticks are let go off seems to be not a very common thing..at least i havent yet heard or found anyone who had the same issue

but your absolutely right, i realized this before as well, silverline senosr does use a smaller gauge wire
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