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Control surfaces work, artificial horizon pitch is backwards.

Posted by Justin Wolford on December 4, 2011 at 4:47pm

When I go to Flight Data the artificial horizon roll corresponds to the aircraft roll but the pitch is reverse of the aircraft pitch.

I suspect this is because the ArduPilot hardware is mounted upside down. The pins still face back and the GPS plug is forward, but the oilpan is on the bottom. When I switch to stabalize mode and test it, the control surfaces deflect as they should to stabilize the plane.

Is it possible to mount the oilpan and ArduPilot upside down like this? Is there an option to reverse the pitch for navigation? I can reverse the servos but that does not seem to be the issue here.

Thanks

Justin

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Replies

  • Developer
    Michael Oborne December 6, 2011 at 2:04pm

    to archinve what you are describing you would need to change the sensor directions for some gyros and accelerometer. otherwise the imu solution will never be correct.

  • Steve December 6, 2011 at 9:04am

    Do you have some physical constraint where you just can't flip the board over ??? The APM pitch and roll direction are set and I believe you can't change it unless you directly edit the code.

  • Developer
    Michael Oborne December 6, 2011 at 5:02am

    you answered the question yourself.... if the apm is upside down, then what else would it do?

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