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Drone lands during Autotuning process, what could be the issue?

Posted by Sj on April 6, 2016 at 9:03pm

Hello, 

I was testing out the Autotune feature with my drone, which has a Pixhawk with ArduCopter 3.2.1 on it. I have autotuned before with another drone and didn't have any issues on that one. The battery was at 65% after it landed.

I am attaching the log file. Could anyone please help with this?30.BIN

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Tags: 321, arducopter, autotune
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Replies

  • Andre K. April 7, 2016 at 8:26am

    you have no power logging (vbatt/current)  - so it's hard to tell you the battery performs, but it's apperently hovering at 73% throttle, and while falling it's going to 100%

    so it needs much more thrust.

    plot CTUL.ThrOut  to see for yourself, the official maximum is 70% , , but I'd say it should be below 60 at most.

    • Sj > Andre K. April 8, 2016 at 7:45am
      I will try to set up power logging and cross check. Thank you.
  • Michael Burmeister April 7, 2016 at 2:56am

    Without a battery monitor it's hard to tell but the motors went to max and it still lost altitude so I would say it ran out of power coming from the battery.  Possibly a weak battery.

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