KurtVD
Second Officer
Flight distance : 365299 ft
Switzerland
Offline
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Hi,
my Spark has the latest firmware 01.00.0900, DJI GO v 4.2.4 (iPhone 7 and iOS11.2.2), batteries and RC are also up-to-date, and just over 3 hrs of flight time.
Yesterday I had an experience that reminded me of some of the posts I have read here, usually they end with a lost drone (not in my case, luckily). I was flying for about 5-7 minutes with no problems whatsoever, in an open field with nothing nearby, just having fun, not recording. When I decided to bring it back and land it, it started "acting out" when it was pretty close, about 20-30 meters from me: all of a sudden, it flew over me and away from me at full speed. Of course I brought it back, but everytime when I released the stick on the RC, the aircraft would start flying away at full speed in a random direction again (I could clearly see it tilt and speed up). This happened about 3 or 4 times until I realised what it was doing and gained some control over it, and all of a sudden it reacted normally again, so I quickly brought it down and landed it. Once it was on the ground, I got error messages about the compass and IMU, but not while it was in the air. I was lucky that it was just high enough when it was doing its thing, otherwise it could easily have smashed into a tree.
Since I was standing near a farmer's shed with a large concrete structure, I thought I had experienced magnetic interference, so I went for a test flight to a place where I have been dozens of times, and the same thing happened again. Now I'm not sure if I dare flying again...
My question is: Is there a chance that my Spark's compass and/or IMU are faulty? It is still under warranty, how would I proceed to find out? I don't wanna lose it to confirm the problem...
Plus I have an observation: Several people have observed their Spark flying away in a random direction, at full speed, and there was no explanation for it. After what happened today, I have a theory: Maybe the module that controls the motors is receiving erratic navigation data (compass, GPS, IMU). Of course there's a failsafe and the AC is supposed to go into ATTI mode when that happens, but my theory is that there's an error somewhere and in certain circumstances, the software doesn't "know" yet that the navigation data has become erratic, so it is still being used to control the aircraft's speed and direction. Then it would "make sense" that it speeds of in a random direction.
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