I've gone over the data several times and can't find anywhere that teh drone's performance doesn't match the joystick inputs.Here is where things get confusing and this is just my recollection of the events leading to the crash. The drone did not seem to be responding to the left yaw input, or it was rotating very slowly, slower than I was accustomed to. I was in VLOS, and as far as I could tell connection to the drone was still strong. I estimate the drone rotated 50⁰-70⁰ to the left when I began inputting left stick to fly the drone back towards me sideways, while the left yaw completed the 180⁰ turn and I could just fly straight towards me. Very quickly after the left stick action, the drone seemed to bank and dive to the left. I tried to conteract this with back and right yaw, but it was too late.
It's not as easy as would be for most flights because the joystick inputs are so gentle and the speeds are very slow.
Added to this there were some complex combinations of joystick input.
Where you gave left yaw input appears to be from 1:36.2 and the drone appears to respond to the yaw input, slowly rotating from a heading of 225° to 207° at 1:41.6.
You also gradually increased elevator input from 1:38 and added aileron input from 1:40.4 and this caused the forward speed to gradually increase.
At the same time you applied gentle negative throttle and the height slowly reduced.
The drone seems to have been following the joystick inputs.
As the elevator and aileron inputs increased, so did the speed of the drone, which reached 14 mph at 1:46.0, after that you applied gentle negative elevator and moderate left aileron, while also adding positive throttle and moderate left yaw.
The aileron input kept the speed at around 11 mph and the drone crashed into something at 1:50.5 and fell.
Launching from reinforced concrete can cause problems, but I can't see any evidence that it did in this case.I really don't know what happened. I recently read that reinforced concrete can mess with the compass and on this flight I stayed close to the building. Any help or ideas would be appreciated.
If your drone had experienced a yaw error incident, it would have happened some time earlier in the flight, as there had been several large heading changes, which all matched the rudder inputs.
There was no unexplained increase in speed or direction.
It appears that the drone was under control when it was flown into part of the building.