djiuser_7brXYWkAs3La
lvl.1
Czechia
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Tl;dr
I've lost my drone. RTH hasn't worked as expected. Contacted support, so far I've got 30% discount on the drone which I consider insufficient.
Last minute of recorded flight: https://www.dropbox.com/s/87kkc8dflfkkhmz/2020_07_01_16_04_40_Cache.mp4?dl=0
I was flying my Mavic Mini over the path, slightly uphill over the forests with pretty regular trees up to 10m height. There was no wind. When I was around 400m away, I lost my signal. Normally the drone should activate the Return Home function and after a few seconds when the drone is closer and signal gets stronger I shall be able to take over the control.
I was waiting, however no reconnection happened. I've waited around 3 minutes, however the drone hasn't returned to the Home Point location. I wasn't able to use the "Find my drone" function, as my remote didn't have a connection with the drone, so I decided to run to the area where the signal was lost.
After another minute or so, the DJI app stopped showing the drone view, it returned to home view, where I could only use the "Connect Aircraft" function, as if it was a new flight.
After around 3-4 minutes in total I was on the site where I've lost connection with the drone. I've searched the surroundings, path, trees and branches to make sure the drone hasn't crashed there, but there wasn't any sign of the drone. I kept using the "Connect Aircraft" function, so I could reconnect to my drone if I was anywhere close to it. I wasn't sure what's the range of "Connect Aircraft" function. I've returned to the Home Point location again to make sure the drone isn't there. I've then decided to search drone in the line of Lost Connection and Home Point locations. The area was really steep and almost inaccessible, so I wasn't able to search it carefully.
After a few hours of searching I've given up, not sure what has happened.
Home point is on the path (left side image).
The last contact point is the corner (right side image)
The aircraft Relative Height during last contact was H=60,3m, whereas the RTH altitude was set to 30m. In which case it was expected to fly in a straight line to the Home Point (blue line on my drawing) after losing a signal. There is also red line which is the aircraft flight path according to the video saved in cache (https://www.dropbox.com/s/87kkc8dflfkkhmz/2020_07_01_16_04_40_Cache.mp4?dl=0).
It is noticeable that the return path (which is the right hand side on the video, marked blue on the drawing) doesn't have any obstacles which aircraft could hit. From the Home Point I was flying uphill, the return path is the valley, no obstacles.
I suspect that the RTH hasn't worked correctly. Clearly if drone would fly over the blue line and would maintain its height it then wouldn't collide with anything, in which case I would be able to take over the controls or drone would return to my position.
Since drone hasn't returned to its Home Point given the above details, I suspect that there had to be malfunction with the drone altitude measurement causing it not to maintain its altitude and crash early after RTH, even before signal was restored.
This situation made me skeptical when it comes to safety features and RTH.
Flight logs: https://www.phantomhelp.com/LogViewer/7UFQ6C1UGY6SR9O8O2WU
What are your thoughts? Have you came across into any RTH or altitude malfunction?
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