Need help on PID Tuning / Big X8

Hello,
I've just finished my X8 build and flew it the first time yesterday.
While hovering I got slow oscillations which look like my Roll/Pitch P is too low. On any control input I get overshooting which nearly leads to a crash.
I also tried autotuning but that wasn't successfull either, as you can see on the Video.

My config:
Motors: Sunnysky x4108s 380kv

Props: 16x5.5 Carbon
ESC: Hobbywing X-Rotor 40A
FC: Pixhawk with APM:Copter 3.3 RC1 (Tried 3.2.1 before but with the same problem)
GPS/Mag: Drotek M8N
Battery: 2x 5000mah 4S 20C

Flightlog: attached


Video of the flight: https://www.youtube.com/watch?v=1TzVRG7ujk8

Can you give me some advice on tuning it so I can at least run AutoTuning?

Thank you!

2015-04-18 19-27-10.log

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Replies

  • try raise up your rate_p  of  roll and pitch

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