Hello, I’ve been building a hexacopter with my team. We’ve crashed a lot of times becuse this is our first time building a drone. This forum and some others were useful for us to solve our problems so far. But this time I couldn’t find a similar crash/problem. Here are some information about our setup;
Ardupilot version - 3.6.11
Frame Type - Hexacopter X
Flight Controller - Navio2 + Raspberry Pi 3B+
Escs - Skywalker 50A - UBEC
Propellers - T1155 - 11x5.5 T-Motor Style Carbon Propeller
Battery - 7000mah 4S Lipo
Wight - 3.5 Kg
Other crashes before the last crash;
We have tried to fly the drone severaly times in both stabilize and alttitude hold mode. The only reason of these crashes was that while flying drone suddenly tilted a random way and kept flying until I disarm the motors in the air.
What we thought the problem was;
We reduced the PID values in the first couple of flights because the drone was too sensitive to the inputs. I reduced them from Mission Planner/Config/Basic Tuning. We thought these low PID values was our problem and set all the PID values to default before the last crash.
Exactly what happend in the last crash;
We prepared the hexacopter for another flight. Tried to take off slowly in altitude hold mode. The drone took off in altitude hold mode again, I raised the drone about 3 meters from the ground. It was pretty stable and I started the Autotune process. About 2 and a half minutes everything was fine. Suddenly drone went to right very fast, I tried to bring it back, the drone stopped about 2 seconds later, it did a 45 degree ccw yaw and 3-4 seconds later it went crazy and moved forward upside down until it crashed to the ground.
Common problem of these crashes;
Drone rolls/pitches towards random position 45 - 135 degree.
What we’re asking for;
We aren’t sure about why drone crashed last time after 2-3 min flight and we need help about that.
Note: Power distribution board is just beneath the Navio2/Raspberry pi, this causes magnetic inference and we did a compass motor calibration. This might be our problem but we aren’t sure.
2020-09-05 17-08-24.tlog (2.2 MB)
Picture of the drone;