Troubleshoot an unstable quad?

We just built a quad here at the QC Co-Lab, but we can't figure out why it won't stabilize.  The left/right axis is stable but the front back axis either seems unresponsive or actually backwards (When you tip it forward the back engine sometimes does nothing, or some times actually speeds up). 

If we try and take off from the table the quad pitches forward every time. If we put the quad in simple mode it piches backwards every time. If we give it just enough juice to almost take off it will drag itself in clockwise yaw on the table.


Our motors are all spinning the proper direction and responding to the motors testing command as described on http://code.google.com/p/arducopter/wiki/AC2_Props_2.   We also went through everything on here http://code.google.com/p/arducopter/wiki/AC2_Troubleshooting

Any idea what we can do to troubleshoot this problem? 

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  • When I'm holding it it feels very much like it's responding backwards, with the the engines speeding up to accelerate the flip rather than trying to resist it.  The more I tip it, the harder the engine tries to pull it over.

    You've got your motors wire wrong! Heres a link to my little quad pod. I had the motors wired wrong.

    Eg. when the gyro rolled left, it tried to compensate with the left motors, but it was wire to the right motors.

    Ergo, instant flip...

  • Confirm that the correct motors are going to the correct connections on the APM.

    E.G. If you have the right motor plugged into the left motor connection, the quad will bank left and compensate left instead of right.

    Also, what orientation are you flying in? X or +? Remember to point the APM in line with your direction of flight!

    :)

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