Running a quad with APM 2.5.... I've always noticed some left/right drift that seems to occur during flight - not consistently though. It is good after an autotune, but I start having to compensate with some left or right stick at times during the flight. I always figured this was wind or some other external issue.
However, now that I have OSD on my FPV, I can see the artificial horizon (which starts level with the horizon) becoming extremely angled (compared to true horizon) at times during the flight (but not the entire time). Sometimes as much as 45 degrees off horizon. I assume this is why the quad is requiring stick in the opposite direction to stay level.
I redid the accellerometer calibration but this didn't help any.
Is this a vibration issue? Doesn't information about roll come from the gyros, not the accellerometer? I assume compass interference wouldn't cause this issue, correct?
Thanks!
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Here is a video of it:
https://www.youtube.com/watch?v=-ONnXLVRTpo&feature=youtu.be
Compare the angle of the artificial horizon to the actual horizon at 1:59 (where there is a significant difference) to other places, like 4:29 where it is matching pretty well. When the horizon matches I don't have to correct roll as much.