ORIGINAL: honghui
I have the same problem. FYI, I am using 3 HS-65 MG on the cyclic, very solid no play at all. The tail servo is a HS-56, I will upgrade it if necessary. The wobble is obvious in hover, but not so obvious (or present) in forward flight. Idle-up is more solid. It becomes the worst when the battery dies down towards the end. I am suspecting that servos don't have enough holding power when voltage drops? I am really not sure. Please help. Thanks.
Again, same question is it nose bobbing up and down, or tail wobble side to side? When the battery gets to the end if you are using Align ESC, it is normal for it to surge for 10-15 seconds when batt low warning kicks in. If it is a tail wag, or tail moving from side to side, try turning down the gain on the gyro.
Pete