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  1. WBN3

    Joined:
    Dec 28, 2016
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    Wow, that's interesting analysis... I just wonder if the flight controls were some way confused being at the boundary of the authorized zone. The log entries that I saw seemed to bounce back and forth like it was arguing with itself about what to do. That's an over-simplification, but my concern all along has been that the software didn't perform as we understood it should.

    When my son commanded a RTH, since the direction it turned was away from the authorized flight zone, I could see no reason for it to hesitate. It appeared to begin gaining altitude, then went back on its downward path and disconnected. The fact that it hovered at 20 meters for some time then began descending again is odd. Could the last little bit of time where the voltages went nuts been it coming into contact with a tree? In Google Earth 3D, the last elevation was close enough to the height of trees in the vicinity that it wouldn't surprise me. I know the 3D render is just an approximation based on the aerial photos it has available, so trees could've been taller, and altitude wouldn't be precise enough to exclude that possibility.

    Thanks for your efforts on this... we are not yet ready to test fly the P4 after this. I am pretty sure the firmware is in need of updating, so if anyone has words of advice or warning about which version to avoid, would appreciate that as well as feedback on DJI Go vs. DJI Go 4.
     
  2. BudWalker

    Joined:
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    Location:
    Santa Margarita, Ca
    Good question .Looking at the accelerometer and gyro data it does appear to have hit something.
    upload_2017-2-17_7-55-22.png
    upload_2017-2-17_7-55-28.png
    upload_2017-2-17_7-55-34.png
     
  3. BudWalker

    Joined:
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    Location:
    Santa Margarita, Ca
    And looking at the motor data it appears the props (particularly the the right back) got caught in something.
    upload_2017-2-17_8-0-26.png

    upload_2017-2-17_8-0-35.png
    upload_2017-2-17_8-0-44.png
     
  4. WBN3

    Joined:
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    The forensic capabilities of the .dat files is really something else. I have little doubt that the bird got caught in a tree top... my concern now is strictly with HOW it ended up getting there after being told to RTH. I'm reluctant to go flying again (or let my son go flying again) until I understand that better.
     
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