Ail shake in Elevator Tic-Tocs

[eluminous]

Sorry if the heading is misleading, I realized after I posted I should have made it clearer that this was a question not a solution to the issue I am dealing with...

The Situation:
I have updated all 3 of my CGY750's to version 1.4 and I am getting the above mentioned issue. The heli's are: 1. Trex600N,
2. Synergy N7
3. Whiplash Gas on TRM 275v2 and tuned pipe.
This issue happens on all 3 to a varying degree.

On heli 1, it has become even more pronounced than with v1.31 and v1.2 which is odd as with this latest update I completely fine tuned the head with the "linkage comp" section to make it even more consistent at all cyclic/collective throws. I have set static cyclic at 11 degrees, and tried changing stability gain down to 4 and 3 with no change. I also dropped gains down from 84 to 60 but this only made the heli feel more "soggy" with no change to the wobble.

Heli 2 is the most locked in and has a really consistent feel, however when pushing the collective stops quite hard the wobble is still visible. Just not as pronounced. Aside from this, heli 3 fly's very consistently through all moves and behaves really well and overall I'm loving the 750 on this machine.

Heli 3 is the worst of all 3 and has a very obvious fast wobble at the end of stops. I have wondered if using the Zeal material between the plate and the sensor is making the sensor move a bit with harder collective moves and then creating the oscillation. I have had the thinner Futaba foam on this machine before with no vibration probs but it still wobbled and did make me a little nervous as it's a gasser running fairly hard on a tuned pipe. Although realistically, very smooth for a gasser. To be honest, I can't really remember if there was any difference in the level of wobble between the harder and softer isolation mount system on v1.31 or not.

My other concern is that since the 1.4 update in heli 1, I am now getting the "nose pullup" in FFF as experienced by some other users doing this update. It seems in most other case this was due to insufficient static cyclic throw with the newer firmware, however I have set approx 11 degrees of static cyclic but the condition still exists whether it's in nose first flight inverted and upright, and both into and with the wind. It doesn't happen all the time, but still often enough. I did test fly on both windy and calm days to see if it made any difference.

Does anyone has some useful suggestions that would be worth trying? Dr Ben do you have any further suggestions? Could/should I try increasing/decreasing D gain on Aileron?

I have researched and researched to see if I could find a possible trigger for this but with no luck for my particular case. And It is possible that this issue is exaggerated by the inherent geometry of the head setup on heli 1 and 3 more than 2. Although I have seen another Trex 600 on a vbar that doesn't exhibit this behavior. Not the same machine although still the same geometry nonetheless.

Overall this firmware update is feeling the best the CGY750 has ever felt in terms of consistent flight performance, just need to sort this issue.

Cheers

[MikeG4936]

Have you tried turning up the D gain on your elevator? That pretty much eliminated the issue for me..