Old Thread I know. But I struggled a little with the aileron wobble as well and finally understand and corrected it. Pretty much the same as everyone else. Wobbles in a hover, goes away in forward flight. Hoping this will help with anyone experiencing the same.
I was running stock setup. Black dampeners outer, orange inner. 766 rail blades with head speeds 1660, 1860, 1960. Always got a wobble that started around 1800 and got worse with increased head speed. (I almost always fly 1860rpm) I spent the weekend rebuilding the head into a few different dampener configurations and testing at different head speed.
swapping Orange Outer, Black inner. - The softer on the outer moved the harmonic up to around 1900 head speed. No wobbles below that. But wobbles above 1900.
All 4 Orange - These 80 durometer dampeners fly smooth up to 2060. No vibs, no wobbles. However, they are a little slow off center for my liking. I'm not a smack pilot by any means but I like the connected feel with the stiffer head.
Now that I finally understood what people were telling me, and understanding how stiff the head really is in the 766, I started backwards and playing with cyclic gain. In the Vbar NEO control manager, I had the following set when the dampeners were set up stock (black outer, orange inner) and wobbles.
(OLD Values)
Style 90
Agility 90
Gyro Gain 90
When setting up the cyclic gyro gain initially, I did what I always do; Slowly increase it, perform fast aileron and elevator stops and look for overshoot in the control loop by observing oscillations on the stops. The 766 basically never would do this. So I kept cranking in the gain and at some point decided that 90 was enough. The only hint Vbar manager gives you is a pointer to around 70 for a "TDR". My Logo 700Extreme used 57. (Those should have been a hint)
I want the head stiff so it performs off center, the only thing I can do is adjust the gain back down, test response, and check for wobbles. I could have left it with Orange dampeners on the outer, but decided almost everyone else is flying with the blacks outer by the manual with no issues so I would stick with that setup. I initially backed cyclic gyro gain down 10 at a time until I noticed how sloppy the heli felt on stops. This was around 50. But absolutely no wobble at any head speed with this reduced gain. The span on this setting is 40-120. So 90 down to 50 is significant. Then trial and error back up until I found the perfect match between no wobble and crisp cyclic. The value ended up being 61. ( Funny as 62 wobbles and 60 feels a little slow. It really is that close.) In order to compensate for the slightly slower loop, I increased agility a little. My final Values on the Vbar NEO are:
(New Values)
Style 90
Agility 102
Gyro Gain 61
I can't really comment on other FBL controllers. I have flown a few but only the Spartan Vortex and the VBAR NEO on the 766. Hopefully that information will help someone else that has the wobbles.
Mark
