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HomeRC & PowerAircraftHelicopterFlybarless Rotor Head SystemsOther › 4.0 twitches
04-26-2009 12:15 AM  9 years agoPost 1
billybob

rrVeteran

Torrance, CA

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did not know if this was normal, but i downloaded 4.0 into my logo 600 silver sensor and when it is on the bench the servos will twitch and bump up and down intermitantly. the machine flys great with know issue's. just wondered if this is normal or is there something wrong with mine. thanks

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04-26-2009 12:33 AM  9 years agoPost 2
tchavei

rrProfessor

Portugal

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Let me guess... high end futaba system like a 14mz 12 or 12FG. On the top you're also using a high end reciever like a G3...?


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"Perfection and patience usually walk side by side..."

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04-26-2009 02:38 AM  9 years agoPost 3
wings19

rrKey Veteran

Tucson, AZ

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If so, I just had a similar problem with my 14MZ, new resistors and encoders is the fix Send 'er in! But, maybe you aren't running a 14 or 12 Futaba...

Nick
If the wings are traveling faster than the fuselage, it's probably a helicopter

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04-26-2009 06:46 AM  9 years agoPost 4
MrMel

rrProfessor

Gotland

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And if you run spektrum and it stops when receiver get connection it means you should rebind the transmitter (same thing when I upgraded)

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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04-26-2009 07:07 AM  9 years agoPost 5
billybob

rrVeteran

Torrance, CA

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actually it's a spektrum 9303, AND it does not stop after it connects. it flys fine, like i said just curious if others were doing it. did not know if this was something to do with 4.0 upgrade or being that it is the silver sensor

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04-26-2009 07:16 AM  9 years agoPost 6
MrMel

rrProfessor

Gotland

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Re-bind and its gone.

Gone fishing..or hunting..or something
My site: http://heli.dacsa.net - VBar videos and more

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04-26-2009 07:17 AM  9 years agoPost 7
billybob

rrVeteran

Torrance, CA

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ok, i will try it again, thanks

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04-26-2009 10:35 AM  9 years agoPost 8
tchavei

rrProfessor

Portugal

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Well actually I was asking because there is a known issue between the vbar and the way those radios send the impulse for each channel. on systems where the signals are sent to the servos in parallel, the vbar will make the servos jitter around center stick. There are several easy fixes so no big deal.

Tony


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"Perfection and patience usually walk side by side..."

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04-27-2009 12:11 AM  9 years agoPost 9
lifepak-1

rrApprentice

Edmonton

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Also experiencing this problem myself.

I am setting up an X90 using 4.0 Silver sensor, 7100R and 8717s. I have tried rebinding the 9303 but I still have the collective glitch. Weird thing is that when I bind my 9C Spectrum to it, then the glitching goes away.

What are the other easy fixes should I be considering if I want to use the 9303.

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04-27-2009 12:23 AM  9 years agoPost 10
tchavei

rrProfessor

Portugal

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I dont know if JR radios (or at least some of them) send signals out in parallel... however if thats the case, then you can either a) change the channel assignment on the Rx so that PIT,ELE and AIL are not in the same groups or, b) shift the center position of each channel so they aren't at the same impulse length. For example one would leave PIT at -100%,0,+100%; ELE at -101%, -1%, 99%; AIL at 99%,+1%,101%. This way travel would be still symmetrical but shifted 1% between axis.

Tony


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"Perfection and patience usually walk side by side..."

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04-27-2009 12:51 AM  9 years agoPost 11
kevlar11

rrApprentice

Edmonton

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4.0
Tony thanks for the info I'm using the same set up as lifepak. Except on a vibe 50.

KD

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04-27-2009 12:56 AM  9 years agoPost 12
tchavei

rrProfessor

Portugal

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Remember, I have no idea if JR radios work as the high end futaba ones (send signal in groups) and this should be only tried if your servos jitter at center stick. Jittering is not the same as buzzing... all servos buzz on the bench with the vbar when not in setup mode.

Tony

PS - This doesn't seem to happen on FASST systems. But there have been at least two reports of it happening with G3 receivers (which process signals in groups)


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"Perfection and patience usually walk side by side..."

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04-27-2009 03:32 AM  9 years agoPost 13
billybob

rrVeteran

Torrance, CA

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i tried binding it to a 12x today and it does the exact same thing, however i noticed as the 2s pack voltage came down(using a 2s for setup)the glitching started to go away. not really sure what to make of that, but it flys great and do not see anything in the air. i have my travels offset very slightly(ail=100,101,elev=99,100,etc). i'll just keep beating this thing to death, since 4.0 flys great.

anthony

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04-27-2009 05:56 PM  9 years agoPost 14
Flying Tivo

rrKey Veteran

Monterrey,NL,Mexico

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Deadband
You can also try increasing sensor/tx deadband.

Felipe

If life throws at you lemons......Squirt some lemon juice in the eye of your enemy!!!!

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04-28-2009 04:37 AM  9 years agoPost 15
lifepak-1

rrApprentice

Edmonton

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I tried adjusting the dead band up to +- 100 without success. I thought that might have been the ticket.

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04-28-2009 09:06 PM  9 years agoPost 16
lifepak-1

rrApprentice

Edmonton

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So after taking some advice on the Vstabi forum, my working solution is to mix the collective channel to Aux 2. Since Aux 2 is a 5.2V reg channel, keep the signal wire there and seperate the power wires from that channel and plug them back to the Aux 1 unregulated channel.

Hope that works for others with the same problem.

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