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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsFutaba CGY › Please help, I am having some issues with wobble
03-31-2012 08:25 PM  7 years ago
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robi1kenobi

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Zagreb, Croatia

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Please help, I am having some issues with wobble
Hey guys!

My setup is as follows:

Outrage Velocity 50 (version 1)
YS 56 SR
R6208SB Rx (high-speed mode, 5.3V regulated)
BLS 451 on cyclic (6.4 volts regulated)
BLS 251 tail (5.3 volts regulated)
Sensor is mounted on top of aileron and pitch servo (on tray of course)
Using supplied Futaba gyro pad (tried others, didn't help)
Firmware in CGY is v1.2

My fuel tank is kinda foaming up, so maybe the problem is in high-freq vibrations, don't know so I'm asking here where to start.

I only got few tanks through the engine, so it's still a bit rich, but I started to lean it out (when it was really rich, wobble was even higher)

My gains are:
73% rudder
46% aileron (if I lower AIL gain, heli wobbles less, but is really sluggish)
60% elevator

Headspeed is about 1800 (still not running governor)

When the helicopter lifts off and I add some collective, in transition it really wobbles hard (sometimes just for second or two, sometimes much longer, looks like skids are going to rip apart)
I don't know where to look at, should I sort out vibrations (it's new heli, but my fan could be the source of vibrations, or even clutch bell - long story ) or should I look at CGY750 expert settings?
My dampers are lubed nicely, it's newly built heli so I guess nothing is bent (but it could be of course). My tracking is perfect. Please help, if you need any more info, let me know

Robert

EDIT: BTW heli is drifting a bit, but it could be my head setup, didn't have swash leveler, was a bit better after trimming, but it was really windy today, so I couldn't get it dialed in. Will redo my head setup, but that's not what concerns me, it's the wobble
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03-31-2012 08:38 PM  7 years ago
Dr.Ben

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Richmond, VA, USA

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Have you Read the V1.2 consolidated tips thread?

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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03-31-2012 08:41 PM  7 years ago
robi1kenobi

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Zagreb, Croatia

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I glanced through it, IIRC I should lower my D gain on AIL in Expert menu?
BTW is it normal for fuel to foam up in the tank?
I'll read the whole thread now, sorry for opening this

Thanks

Robert
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03-31-2012 08:59 PM  7 years ago
JPhillips

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Waco, TX

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Don't be sorry, its a valid question but probably been answered in the thread that Ben referenced. On that note, where are your swash AFRs? If they're too low (sub 50) the 750 won't perform as well as it can and should. Also, how far out are the balls on your servos?

Good luck and hope you get it sorted.
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03-31-2012 09:45 PM  7 years ago
robi1kenobi

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Zagreb, Croatia

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Thanks for your response
My swash AFRs are left default (50% I guess?)
Balls on servo horns are 14.5 mm off center (29 mm apart from each other, round servo horns) - per Outrage manual
I bought servos used and the heli they were on looked pretty much used, maybe they're faulty? :/
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03-31-2012 10:10 PM  7 years ago
JPhillips

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Waco, TX

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You didn't adjust your swash AFRs? How do you know how much collective and cyclic pitch you have? Did you set up this below or did you get it already set up? You adjust the swash AFRs to get your desired pitch range but I'd imagine they're pretty low with as much throw as you have in your system. Sounds to me like you've got too much mechanical gain in the system. Have you experimented with moving the balls inwards closer to center? I'm running 8mm from center everywhere and my AFRs are mid 50's. I too had too much mechanical gain because I was out over 10mm and my AFRs were too low to allow the 750 to perform well.

I don't know the Velocity 50, but I know someone on the team with a 750 that I've flown and it flies really well, I'll ask him how far out he is.

-Jason
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03-31-2012 10:28 PM  7 years ago
robi1kenobi

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Zagreb, Croatia

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I measured my collective and cyclic pitch with pitch gauge after initial setup, it was looking pretty good and I left it that way
My collective pitch is +/- 13.5°, and my cyclic pitch is +/- 10°, no binding at all.
Really didn't want to crank it up more
As I read the Consolidated tips thread, I guess I should lower D gains and increase Head Response. We'll see. Dr. Ben, what do you say?
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04-01-2012 04:37 AM  7 years ago
Dr.Ben

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Richmond, VA, USA

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You are too far out on the servo arms. Go in so you have 8 degrees at 50-60% swash AFR, then follow the notes for tuning the system as per the thread's opening verbage. For now, keep the head response at 2 on AIL and ELE, but be prepared to go to 4 on the AIL head response if the usual tips in the opening verbage of my tips don't help. Servo choice plays a big part in how all of this works, but do the listed things, and then let me know how it does. I'll work with you from there.

Ben Minor
Peak Aircraft/Team Minicopter Team Futaba Team Kontronik USA
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04-01-2012 05:42 PM  7 years ago
robi1kenobi

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Zagreb, Croatia

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Thank you very much Dr. Ben, you actually solved my problem

Here is what I did:

I gain on AIL and ELE set to 30%
D gain on AIL and ELE set to 50%
Head response set to 3 on both
AVCS.DMP set to 100% on AIL and ELE
Rate constant set at 150% on both
AIL and ELE control feel set to 7

Heli now flies great (now I'll get balls on servo horns few millimeters closer) without wobble
My gains are 70% rudder, 65% aileron and elevator and I think I could go even higher

Now I am very happy CGY750 user - GREAT device!
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HomeRC & Power✈️Aircraft🚁HelicopterFlybarless Rotor Head SystemsFutaba CGY › Please help, I am having some issues with wobble
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