Hello, new member. I have searched the site a lot about this without any luck. I'm using apm2 in a Great Planes Stick 60 airplane. The software version is very recent, no more than a week or so old ( you can assume early July 2012 version on everything). Stabilize mode seems to work fine. FBW A seems ok as well. My problem is with the achieving and maintaining the altitude settings in AUTO mode.
In auto mode the aircraft does not seem to attain the height it has been set for in the mission planner. When switched into auto mode the airplane does a shallow dive and the motor (nitro motor) throttles down to a very low idle setting. At that speed the airplane can barely maintain altitude and it is certainly not the altitude I have set it for..it flies at around 80 feet even though the mission is set for 200 feet for all legs. I have to bail out into manual mode after about 30 seconds to avoid a crash.
The APM2 is inside the airplane. Do you think that the barometer sensor is not able to make good readings or is there something else I should try? Should I consider using the GPM to control the altitude?
Any help or advice is greatly appreciated!
I have the same issue in my tests with APM 2.4, When goes to AUTO the engine (electric) goes to 0. I reset the APM several times until i get the desired answer on AUTO.
Tomorrow is the next test day. Should I update to 2.5 ?
problem solved. throttle was reversed. I must have done 20 flights in auto mode with it reversed, trying to understand why the throttle was going as low as it could. Of course it did, it thought that it was increasing the power! In fairness, how else do you tell if your throttle is reversed? Before each flight, I check the airplane in stabilize mode to make sure the flight controls move the right way, but how do you check throttle? However, it was a real pleasure to see the plane fly its mission successfully this evening. Hope this helps someone. If you read my July 29th reply, now I'm not sure why the throttle seemed to work when it was loitering around the home position during that flight.