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Wondering if any log file analysers can help with with this.
Standard drone flight (2nd of the day), perfectly normal behaviour for the first 10mins of the flight, light winds, remote area with no interference.
Just taking a normal video when the drone starts moving increasingly rapidly full left (flight direction, not yaw). I correct with yaw but no matter where the nose is pointing it continues to fly 90 degrees or so left. No errors show on screen. I point the nose back to the launch boat (180 degree roughly from direction of filming) and the left horizon is visibly tilted some 30degrees on the screen and still showing large left sideways flight.
I manage to crab it back towards the boat and descend (in case it was wind but the 180 degree heading change and still full left drift hints no), eventually the roll stops somewhat and am eventually able to hand catch it but for a 45 second or so period it was nearly totally out of control requiring large inputs just to stop it flying off.
The video is here where it started (problem persists until about 55 seconds):
https://youtu.be/YzO9M-cTHIs
The .TXT file log is here:- https://www.dropbox.com/s/qi2hzwvh16pg9n3/DJIFlightRecord_2019-03-26_%5B16-37-21%5D.txt?dl=0
The .DAT file log is here:-
https://www.dropbox.com/s/vcogyorgiqj532w/19-03-26-09-59-41_FLY023.DAT?dl=0
AirData flight log:- https://app.airdata.com/share/nxCcQG
There are some not enough power ESC errors at roughly the time it started (nothing showed on screen that i could see) and these vanished. Look at record numbers roughly 6200 to 6500 onwards for the onset of the problem. There is a high wind warning later in the event but im suspecting this is more of a false report due to the problem than actual wind.
A few points:- - Compass was calibrated the day previously - Compass and IMU showed all green and low errors prior to take off - Second flight of the day within a few miles of that location - I dont think it was wind because the direction of travel was always left even when the nose was pointed in a completely different direction - There was a Mavic Pro in the air within a few hundred metres at all time and that didn't log any odd flight behaviour or wind warnings - Winds were low (observed) and low according to AirData (in the single figures MPH range and no gusts) - Props are all undamaged, drone hasnt been crashed etc - Compass looks fine as there was no yaw associated with this event at all - A new flight was conducted the next day near to that location and that had no issues at all
So, any ideas what the hell happened there? I very nearly lost the drone due to proximity of cliffs and not being about to initially get it heading back.
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Second Officer
Captain
