Problem with alt hold and loiter

Posted by Michael Lagler on May 31, 2015 at 5:20am
Hi guys.When I engage alt hold and loiter mode my hex accelerates and deaccelerates does not hold position. It work perfectly until I added new motors, esc and props. The vibrations look fine just can't get it right any help please?

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Replies

  • Moderator
    Nathaniel Caner May 31, 2015 at 8:14am

    Do you have a log file from an affected flight?

    Regards,

    Nathaniel ~KD2DEY

    • Michael Lagler > Nathaniel Caner June 1, 2015 at 2:11am

      Hi Nathaniel i have attached the files.

      Thank you very much.

      2015-05-31 12-48-30.log

    • Moderator
      Nathaniel Caner > Michael Lagler June 1, 2015 at 3:59pm

      Hi Michael,

      Unfortunately, the log doesn't reveal much. The logging level is at the minimum Default. I would suggest changing this to Default+IMU at least to be able to rule out vibration as a contributing factor. With respect to mounting method you mention using gel and double sided foam tape, it is possible to use too much mounting material. In any case it should just be four small squares, one in each corner.

      When you say the quad accelerates, do you mean in forward flight or do the motors pulse?

      Regards,

      Nathaniel ~KD2DEY

    • Michael Lagler > Nathaniel Caner June 1, 2015 at 10:19pm

      Hi Nathaniel

      I shall do that thanks.

      The motors pulse.

  • Tim Pritts May 31, 2015 at 8:07am
    I would recalibrate your ESC's. I would also try lowering the gains on your PID settings.
    What are the specs of your hex?
    • Michael Lagler > Tim Pritts June 1, 2015 at 2:09am

      Hi Tim I will try recalibrate the ESC's i have already tried lowering the gains on the The Altitude Hold P, The Throttle Accel PID gains to P to 0.5, I to 1.0. Its a F550 frame with sunny sky 980Kv motors and 10x3.8 props.

  • 3D Robotics
    Chris Anderson May 31, 2015 at 8:03am
    This is almost always due to vibration. Are you mounting the autopilot on the recommended foam?
    • Michael Lagler > Chris Anderson June 1, 2015 at 2:06am

      Hi Chris it was all working 100% until i changed the motors and props.

      The flight controller is mounted on gel and foam double sided tape.

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