Hi there,
Although my quadcopter flies great in Stabilise mode, it drifts up and down when in AltHold or Loiter mode. I have made sure all my vibrations are within acceptable limits.
The following plot is from the attached log. I have graphed GPS.RelAlt and CTUN.BarAlt. Should BarAlt be fluctuating so widely?
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This graph may be more useful - it shows how Altitude tracks Desired Altitude (not very well!)
Click on the image to get a much better, more detailed version.