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Lost Mavic

Discussion in 'Lost and Found' started by snowy23, Dec 18, 2017.

  1. snowy23

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    #1 snowy23, Dec 18, 2017
    Last edited: Dec 18, 2017
  2. sar104

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    That's not enough information. To share the flight log itself you need to enable that in AirData and/or upload the log to PhantomHelp:

    DJI Flight Log Viewer
     
  3. Meta4

    Meta4 Moderator
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    Healthydrones is the old name for Airdata. They are the same thing and neither is particularly useful for most incident investigations.
    The preferred way to share flight data is to go to DJI Flight Log Viewer
    Follow the instructions there to upload your flight record from your phone or tablet.
    Come back and post a link to the report it provides.

    However for this case, the cause is obvious without seeing proper flight data.
    The flight was doomed because the compass has been screwed up, probably from launching on a steel or reinforced concrete surface.
     
  4. LarBear360

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    OMG! compass error, yaw error, strong interference, no fly zone, weak GPS all within 9 feet of home. Poor little Mavick didn't stand a chance
     
  5. snowy23

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    Thanks for the info will have a go later today when i finish work it was a proper school boy error on my part
     
  6. sar104

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    As @Meta4 said, it clearly went into ATTI mode due to serious compass errors, possibly due to the takeoff location have magnetic interference. The good news is that the resulting drift was very consistent in speed and direction, and so it should have kept going until critical battery level initiated autolanding. Estimating by linear regression and extrapolation we get:

    DJIFlightRecord_2017-12-18_[15-26-04]_01.png

    That suggests it would have drifted out to around 2160 m from the home point. Plotting on GE:

    DJIFlightRecord_2017-12-18_[15-26-04].jpg

    I'd start looking around there. For what it's worth, error analysis at the 99% confidence level suggests a circle of radius 150 m, but that includes extrapolation assumptions regarding wind speed, direction, power use and autolanding battery level, so not to be taken as definitive. And if it autolanded at 10% instead of 15%, then that would put it around 2600 m and in the field the other side of the railway line.
     
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  7. Meta4

    Meta4 Moderator
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    snowy23 likes this.
  8. RodPad

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    To all,
    and Wow

    Since I'm not smart enough to view the remote control stick postions, did you or did he have any control or could have with this many errors.

    In other words he should still been able to control it in ATTi mode?

    Rod
     
  9. snowy23

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    Great thanks for the info will do a recon of that area and keep you posted
     
  10. sar104

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    Until the uplink was lost he would have had control, but for the latter part of the flight he did not provide any stick input.

    DJIFlightRecord_2017-12-18_[15-26-04]_03.png
     
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  11. snowy23

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    Flown from that location with my phantom advanced on many times first time with the mavic like i said earlier school boy error lots of compass errors to busy looking at tablet trying to figure out what was going on then looked up and gone lesson learned !
     
  12. snowy23

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    Thanks for the help with this data its well appreciated
     
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  13. gfieldsr

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    Sorry for your loss and I hope with the help provided you are able to locate it.

    On another note, there seems to be missing comments in this thread (or at least for me). So, I must admit, I had to read between the lines to what comments that I am able to read. Is this isolated to me or true to others as well?
     
  14. RodPad

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    Where did you get lost?

    Had you clicked on the links that were posted, like the first one?
    Airdata UAV - Flight Data Analysis for Drones

    Rod
     
  15. gfieldsr

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  16. gfieldsr

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    RodPad likes this.
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