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


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Old 11-10-2019, 06:37 PM   #1 (permalink)
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Default Wiggle during tic tocs

So I've been trying to tune this little quirk out for quite a while.

Basically, when doing tail down tic tocs, the helicopter will have an aileron wiggle on the stops. I've tried reducing the gain, which seems to help, but hasn't eliminated it completely.

Helicopter setup:
3-blade Goblin 700
Rotortech 690 blades
JR 8917HV servos on HV
Headspeed 1850
Mini vbar w/5.3 pro

Style 77
Agility 118
Gain 20 (reduced from 24, tried 18, didn't help)

Elevator Precomp 25
Paddle Simulation 12
Control loop, 59 on both elevator and aileron

The helicopter flies pretty damned well otherwise.
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Old 11-10-2019, 10:37 PM   #2 (permalink)
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With a three bladed head you can lower the default main rotor gains, but it could be that the damping is too hard for your chosen rpm.

Mode 2 flyers can also have a tendency to input aileron on fast elevator changes. Does your other helicopters do the same? Then it could be this.

Swash plate phasing on multi bladed heads can also be out slightly, easy to check, move the one blade over the nose, give only aileron input and it should not change pitch, to check for elevator do the same with one blade at 90 deg to helicopter.
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Old 11-11-2019, 12:20 AM   #3 (permalink)
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Hmm, I'll turn up the headspeed and try it out just to see if it makes a difference.

Gains are already way down.

And nope, this is the only helicopter in my fleet that exhibits the behavior.

Phasing is all good as well.
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Old 12-30-2019, 01:16 PM   #4 (permalink)
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Your head damping is too stiff. I had the exact same behaviors on my X3, NEO Vlink and Vcontrol. Tried every setting imaginable with Pro software. I shaved down the stock washer about 1mm and one flight to the next with the exact same settings, the wobbles disappeared.
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Old 12-30-2019, 06:23 PM   #5 (permalink)
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Quote:
Originally Posted by RappyTappy View Post
Your head damping is too stiff. I had the exact same behaviors on my X3, NEO Vlink and Vcontrol. Tried every setting imaginable with Pro software. I shaved down the stock washer about 1mm and one flight to the next with the exact same settings, the wobbles disappeared.
Never considered this. I have shims on the grips and not sure how many. I'll try removing them and see what happens.

I'll report back what I find.

Thanks!
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Old 12-31-2019, 05:59 AM   #6 (permalink)
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Quote:
Originally Posted by RappyTappy View Post
Your head damping is too stiff. I had the exact same behaviors on my X3, NEO Vlink and Vcontrol. Tried every setting imaginable with Pro software. I shaved down the stock washer about 1mm and one flight to the next with the exact same settings, the wobbles disappeared.

Please, which washer are you talking about?

Thanks!
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Old 12-31-2019, 02:38 PM   #7 (permalink)
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The CNC'd washer with the built in lip that contacts the blade grip bearing race. I ground down that lip and then used a ultra thin washer to contact the bearing race. The blade grips were a little notchy before when it had the wobbles and after, the blade grips were smooth when assembled.

So far, I've been able to get it down to 2300rpms with no wobbling anymore. I went down this path after one time when rebuilding the head because I cracked a blade grip, I thought maybe the damping was too loose so I added a extra shim and the wobbles and wiggles became way worse despite any vbar settings I tried.
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