Well I don't get it guys. I've been flying 3D for a while. My last model was a H9 27% Cap and it never rocked the wings like my Yak is doing, and is a Cap!! As a matter of fact, that Cap was very easy to Harrier and move around the runway, inches from the ground. I purchased the Yak thinking that it would be even easier with it.

I don't think correcting is going to do it, the rocking is too violent and if it was controllable I think I would have handled it by now. My Cap rocked the wing very little and yes it was totally predictable.

Lateral balance is not likely either. The airplane is pretty much "trim less". Perfect uplines, perfect downlines, very little trim required when inverted, and very explosive on high rates. I can Flatspin this sucker without loosing any altitude. I have mixes for Knife Edge and Idle to 1% downtrim. No coupling issues so far. Rolls are as axial as could be.

Could anyone tell me if my prop size seems right? The model is 30% scale, DA50, BME 22x10. My gutt tells me to move to a 23x8, or a 24x8. I'm thinking I may not have enough prop wash over the ailerons.

Did I mention that the wings will rock side to side? Not just left or right.

Thanks for your help guys, keep it coming.