The fix was about the unwanted roll (aileron) movements during pitch (elevator) inputs and vice-versa (on some mounting positions). It's not about the older yaw coupling (horizon drift) . Are you sure you are getting unwanted roll movements when you go forth or back (elevator input), or unwanted pitch movements when you fly sideways (aileron input)? Also, you can test this on the bench (motors off). I've bench tested it and the pitch / roll coupling is definitely gone with fw 1.9 rev2.
Originally Posted by Daloaf
Just did a few flights in the backyard to test out HF firmware 1.9 v2 and there is still some roll coupling going on. It's hard to tell because of my small flying space, but it seems to be less then before, but still there. I'll test it out more this weekend when I go out flying.