M4P lost connection and felt out of the sky

[Baronner]

My MP4 suddenly lost connection with M4P and seemed to felt out of the sky.

Facts:
- 119, height and 110m distance of homepoint (= also controller position).
- Full connection strength.
- No obstacles between motion controller 2 and the M4P. (Home Point (H) is visable below the swimmig pools)
- All batteries at > 75%.
- 22 satellites
- Goggles 2 and controller looses suddenly connection at a speed of 8.6m/s
- M4P didn't return to home

NB: prior to take off I was asked for a battery firmware update, which I did. Rebooted drone afterwards.

See link below for the camera view before loss (recorded from the Goggles 2). I do not have black box logs, since DJI Fly App was not connected at time of the loss

Video: MP4 connection lost & felt out of the sky (video was recorded from goggles)
Airdata: Airdata Logs

What could be the cause of this loss?

 

[Yorkshire_Pud]

the log on PH DJI Flight Log Viewer - PhantomHelp.com

 

[Yorkshire_Pud]

Uum I am getting a virus warning from firefox for the downloaded csv.

 

[Baronner]

Here no virus warnings and a perfect readable CSV. But the content is abacadabra to me ;-)

 

[slup]

...What could be the cause of this loss?

The loss of connection was most probably not the root cause, instead a consequence of the incident.

All attitude telemetry + battery data doesn't indicate anything abnormal just there in the end of the log, you had just started to apply a full command for forward flight (stick mode 3)... & then 4sec later the log ends with your mini still airborne.

All this strongly indicate a power loss, either battery related or due to some electronical fault. This stopped the motors, ended all connections & stopped the log recording... & your drone fell like a rock.

 

[Baronner]

Thank for your analysis. That's what I was thinking, and now the telemetry is supporting that version. Sunday, I started a Fly Away Case on the DJI website. No response so far, but I'll hope they support this analysis and will sent me a free replacement. Thanks again for helping me!

 

[mreco99]

That’s the worst nightmare, did you retrieve it ? Did controller tell you where it was?
And let us know what happens

 

[Baronner]

Didn't retrieve it. I sent in a fly away case at DJI. No progress on that case since last sunday.