I recently got a fy690s frame and put it together. I got it to fly ok with a 2.5 board (but not great) and I switched the board out for one with the compass trace cut and an external compass installed. I tried to fly it today and it sort of took off ok then just seemed to not be able to stabilize and flipped. I'm attaching the log for the flight so hopefully someone can help me out. I've got copters flying with APM before, but I'm not sure what is wrong with the copter this time. Let me know if any more info is necessary.
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I've determined the source of the problem. It seems that the default PID's were WAY too high for this copter and caused it to oscillate a lot. I think it has to do with the fact that this is a 6S setup and has tons of power. I havled the rate roll/pitch values and dropped the throttle rate P value from 6 to 3. This is much better than before and now I should be able to autotune as soon as the wind allows. I followed instructions here on tuning http://copter.ardupilot.com/wiki/tuning/