My Problem is, that my big Arducopter don't stay in Loiter Mode. It flyes away in one direction with more an more speed. GPS has a 3D fix. Same Problem in RTL. It don't gets its Position and hides away.
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If you have the GPS/Compass module pointing the wrong way, it will fly off out of control in different directions. Also, if you have the compass orientation parameter set incorrectly, it will no be able to maintain a heading. The declination as described can also hose you.
http://copter.ardupilot.com/wiki/common-installing-3dr-ublox-gps-co...
That was also my Problem!
Please post a flash log of your loiter and rtl flight and I'll send you some gains that will work. You most likely have many of them too high with your extra thrust.
Jason
If you're not using the standard 3DR platform, you'll need to tune your settings for your copter. Check out the animated guide here.
I have the same problem with my Tricopter if I turn on RTL it comes back in my direction but it doesn`t stop it goes right past me until I nearly lose sight of it and have to bring it back myself, and in loiter mode, well I dont think that loiter mode does anything, it just drifts off..
Parameters are standard and in Stable Mode its ok but Loiter or RTL the copter want to commit suicide. Any idea?