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Loiter mode with AC3.1.2

Posted by Yap on March 31, 2014 at 7:13am

Hi All,

 

I'm trying to fly my quad with loiter mode with its default setting. It can't stay at the position and tends to increase its speed and went out of control.  Do I need to tune my PID in order to achieve a stable loiter flight mode? Please advise me.

 

 

Thanks.

Yap

 

 

 

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Replies

  • T3
    Richard Boyhan March 31, 2014 at 6:36pm
    How is your altitude hold? If your copter can't maintain altitude hold, don't bother with loiter till you fix altitude hold. Loiter relies on altitude hold to work. Actually most of the advanced flight modes rely on altitude hold to work. Did you do compassmot test? What were the results? Did you check vibration? What were the results? How many sats are you getting? Did you run autotune? Try reading the wiki online manual it's actually pretty good. Good luck and fly safe.
    • Pedals2Paddles > Richard Boyhan March 31, 2014 at 6:48pm

      Good point on the compass mot. I haven't done that yet either on mine and I need to.

  • Pedals2Paddles March 31, 2014 at 7:51am

    Well the direct answer to your question is sort of.  It is not that simple.

    First of all, if you're drifting in loiter, that is probably a lot more to do with vibrations or GPS errors than tuning. If you have high GPS HDOP, or lacking a 3D GPS fix, it's going to have a hard time holding a position.  And without vibration dampening, it will never be able to hold position.  Vibration: http://copter.ardupilot.com/wiki/ac_measuringvibration/

    Secondly, yes you absolutely need to tune your aircraft. The defaults will not provide stable, useful, safe flight in any mode.  You need to follow the tuning guides before you try to fly anything anywhere.  And you need address the vibrations before you can even bother tuning it.  Tuning: http://copter.ardupilot.com/wiki/tuning/

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