@Jman841 wrote:
I am flying a plane that has been flown in the past without issues, is running an original 3DR Pixhawk and GPS, and this morning the first flight of the day was perfect. Firmware is Arduplane 3.5.3 and logs are below.
First flight was a basic take off, autocal for the airspeed sensor as the air in this location is much denser than where we initially calibrated it, already redid the compass calibration for this aircraft in the new location as well. First flight was a take off to 200 meters, RTL for 8 min, then a basic auto mission and auto landing and it flew absolutely perfect.
Landed, setup the camera on board, recalibrated the airspeed sensor, and took off again without cycling the power. The take off was fine and reached 200 meters as expected, then the plane turned toward the first waypoint and all was good. Once it got close to the first waypoint is when it started acting very weird, the plane would pitch up very sharply and try to turn. After seeing this I put the plane into RTL to get it back to land, however, it started doing a very tight loiter circle in a totally different location. From here I tried guided mode to get it back in comfortable sight, however again, it tried to pitch up and ended up stalling itself. I switched to manual, recovered the stall (simply giving throttle and pitching up) then switched to FBWA to get it back safely and landed. Only at one point in FBWA did the plane try and pitch up again, however, I was able to get it back and land safely.
I am very concerned as I have never seen this behavior before in Arduplane and have built quite a few planes without issues. Any help or suggestions would be greatly appreciated. I reviewed the log and there are no signs of mechanical issues as the desired pitch and roll seem to always match up.
tlog: https://drive.google.com/open?id=0B6BOzAnbw55QOGhiMHlXdmdheGs
Dataflash log: https://drive.google.com/open?id=0B6BOzAnbw55QS3JoZEZ6MUxUUDQ
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