I had a crash with my Tarot Ironman 650 with an APM 2.5.2 control board and APM:Copter firmware version 3.1.5. I flew about 9 minutes switching between "stabilize" and "loiter" mode. Everything worked well and the copter flew as stable as always although the copter was not correctly balanced without the camera gimbal.
The copter was in "Loiter" mode when suddenly he made a role and crashed into the ground. I checked the motors and ESCs and all connections. Everything was fine.
When I searched the telemetry and flash logs, I couldn't find the reason for the crash.
It would be great when some experts could have a look on my log files.
Thank you in advance.