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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsFutaba CGY › Another head wobble on the cgy750
03-02-2012 05:14 PM  9 years ago
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The Doktor

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ireland

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Another head wobble on the cgy750
Hi all, Long time reader first time poster...

Im haveing some issues since updating my cgy to v1.2. Im geting a slow cyclic wobble while in a hover. Ive read a fair bit and tried lots of settings but cant seem to get the wobble to go away. It usually seems to happen after a slight stick input, and seems to be all ok during ff until I come to a stop into a hover.
Some info on settings and set up:

Trex 500, i2 head, s9650 servos. Head speed 2500 to 2800. AFR Ail 61% at 8 degrees, Ele 63% at 8 degrees. Ail and ele TX gain from 50 to 90%. Ive tried D gain from 0 up to 100, and I gain from 15 up to about 60.

Ive also checked sensor mounting, all mechanical stuff including replacing even slightly suspect bearings but it doesnt look to be a vibration issue as it was ok with the previous softwear.

Anybody an ideas where I should be looking?

Thanks a million
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03-02-2012 05:49 PM  9 years ago
Dr.Ben

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Richmond, VA, USA

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Increase the head response from 2 to 3 and tell me if that helps.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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03-02-2012 05:51 PM  9 years ago
DougV

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Miramar, Florida - USA (Ft. Lauderdale)

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I had the same wobble after upgrading the software, all I did to get rid of it was to drop the D gain to 40% and up the I gain to 65% on both the elevator and aileron.

Doug
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03-02-2012 06:07 PM  9 years ago
The Doktor

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ireland

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Dr Ben, I already had head response at 3, so I put it up to 4. It certainly seems a whole lot better. Just tried one pack in the garden and it doesnt seem to do the low freq wobble nearly as much. (d gain at 0 and I gain at 30)

Doug, Ive dropped the D gain as low as 0% and it made no difference.

Thanks a lot guys
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03-02-2012 06:26 PM  9 years ago
Fnity

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Denver, CO

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Same wobble here on a new unit with the latest firmware. Was setup like my other CGY still running the firmware prior to this latest and made the suggested adjustments last week.

Have not had time to take it back out since, and hope it fixes it.

Weird slow wobble on a machine that was running fine on a different fbl system with no other changes made. I admit I had not kept up with the firmware update and recommended adjustments but after a bit of reading I dropped the D gain and increased the head response as noted above.

Cant wait to take it back out as Im sure its going to ROCK
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03-03-2012 11:23 PM  9 years ago
Fnity

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Denver, CO

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Got a few flights on the 700E/CGY...

No more wobble I dropped the D gain and set the head response at 2. Its amazing now, my fault for not doing the research before taking it out the first time.
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03-03-2012 11:31 PM  9 years ago
The Doktor

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ireland

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Hi finity,
out of interest, as I have a 700E that ill be getting back in the air next week, what did you end up having your D gain set to? (i know it may be different for my set up, but it gives me a ball park figure)
Thanks a million
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03-03-2012 11:58 PM  9 years ago
Fnity

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Denver, CO

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D gain at 50, Head resp. 2
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03-08-2012 02:55 AM  9 years ago
Band1086

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Kennewick, Wa. USA

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I put together a new Whiplash with a CGY750 on it, and it had a wobble which looked like it would shiver for a couple of seconds every few seconds. Turned the D gain on ail down to 100 and it stopped. It really flies extremely well... I wonder why they set it at 200 at the factory?
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03-08-2012 04:34 AM  9 years ago
Dr.Ben

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Richmond, VA, USA

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The 200 value was based on original version firmware. The need to run the D gain lower came about after 1.2 firmware was released and the wobble showed up in certain models and set ups. I would suspect that whenever a future firmware version is released, the default D gain will be adjsted to a value that will work for most set ups from the start.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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03-27-2012 07:47 PM  9 years ago
The Doktor

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ireland

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Ok, talking about the Trex 500 here. I know its been a few weeks but this was the first chance to fly properly after getting advice from Ben.
After increasing the head response from 3 to 4 there is a great improvement. I still have the D gains at 0%, though upped these to 10% and got wobble after the heli comes to a stop while giving cyclic input, so these are back at 0. I was also able to bring the transmitter gains up to 80 and 75%. I gains are at 30%.

The heli has gone from scary to fly to being lovely (for my style of flying which is a long way from 3d!).

So Dr. Ben, thank you for your help.. next time youre in Dublin, I owe you a pint
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03-28-2012 04:39 AM  9 years ago
Dr.Ben

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Richmond, VA, USA

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My pleasure.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsFutaba CGY › Another head wobble on the cgy750
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