ALTA death spiral and crash

Discussion in 'ALTA' started by Adam Varadi, Nov 26, 2015.

  1. Adam Varadi

    Adam Varadi Member

    Joined:
    May 3, 2014
    Messages:
    156
    Likes Received:
    17
    I was flying my ALTA on a shooting today, flew 4-5 flight without problem, then suddenly lost control, the copter started making very stragne noise (high vibration) and then started to yaw left and roll left and in a spiral it crashed.
    Temperature was 4 celsius, the gros weight was 12.5 kg.
    After crashing I could stop the motors, only when I teared off the batteries.

    Tried to contact Freefly, but no response yet.

    Is there any way to check the log files?
     
  2. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,377
    Likes Received:
    1,162
    Hi Adam:
    Sorry to hear about this. Today is a national holiday here in the USA (Thanksgiving), so FF is closed until the morning of Tuesday December 1st.

    Can you please remove the microSD card from the GPS unit (it's under the small rubber cover). You should see a .csv (Comma Separate Values) file that corresponds to the flight. Post it on the forum or email it directly to me at ajohnsonlaird AT me DOT com and I'll have a look at it.

    Certainly send an email to support@freeflysystems.com. Send the .csv file as an attachment if you can.

    If the .csv file is very large (e.g. > 2 megabytes) your email software may object. In that case use a Web based file transfer service like wetransfer.com (it's free) to email the file to me -- I can then get it to FF.

    Andy.
     
  3. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,377
    Likes Received:
    1,162
    Adam:
    Afterthought: Could you create a compressed ZIP file of *all* of the .csv files on the microSD card please and send that ZIP file to me. I'd like to be able to see if there was any evidence of an impending problem *before* the mishap flight.

    Thanks
    Andy
     
  4. Adam Varadi

    Adam Varadi Member

    Joined:
    May 3, 2014
    Messages:
    156
    Likes Received:
    17
  5. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,377
    Likes Received:
    1,162
    OK. Got the ZIP file. Thanks.

    Is this damaged file the most recently created? If so, that will be the one for the mishap flight, I'm afraid.

    If it is the mishap flight's file, then there is a chance that the data is on the microSD card, but just not in an easily accessible form.
    Let me know and we'll work from there.

    Andy
     
  6. Adam Varadi

    Adam Varadi Member

    Joined:
    May 3, 2014
    Messages:
    156
    Likes Received:
    17
    It is the last big one, there is only 1 file after this, but thats only 613 KB.Any idea how to recover/send this file?
     
  7. Adam Orens

    Adam Orens Member

    Joined:
    Oct 7, 2015
    Messages:
    60
    Likes Received:
    3
    :( Sorry to hear about your issues. Based on the logs, do you have the UTC time of the incident? Makes it a little easier. All the logs look normal so Im guessing that the corrupted log is the one that contains the culprit.
     
  8. Adam Varadi

    Adam Varadi Member

    Joined:
    May 3, 2014
    Messages:
    156
    Likes Received:
    17
    I think it was UTC 7am 58 min.
    In my time zone it was 8 am 58 min.
    Any idea how to send the damaged file?
     
  9. Adam Varadi

    Adam Varadi Member

    Joined:
    May 3, 2014
    Messages:
    156
    Likes Received:
    17
    I think I was able to recover the file. Any abnormal data in here?
     

    Attached Files:

  10. Adam Orens

    Adam Orens Member

    Joined:
    Oct 7, 2015
    Messages:
    60
    Likes Received:
    3
    Second to last log is at 08:57:41 and then jumps to 08:58:45 almost a full minute of no logs. Hmmmm. What were you powering with??
     
  11. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,377
    Likes Received:
    1,162
    Are you running a Mac or PC? We might be able to get you to create a forensic "image" of the entire microSD card and send that...

    Andy.
     
  12. Adam Orens

    Adam Orens Member

    Joined:
    Oct 7, 2015
    Messages:
    60
    Likes Received:
    3
    08:55:15 looks to be a normal log.....Are you sure?
     
  13. Adam Varadi

    Adam Varadi Member

    Joined:
    May 3, 2014
    Messages:
    156
    Likes Received:
    17
    There is two 10.000 6S TATTU batteries. They survived, the motors were still running before I disconnected the batteries.
     
  14. Adam Orens

    Adam Orens Member

    Joined:
    Oct 7, 2015
    Messages:
    60
    Likes Received:
    3
     
  15. Adam Orens

    Adam Orens Member

    Joined:
    Oct 7, 2015
    Messages:
    60
    Likes Received:
    3

    :)
     
  16. Adam Varadi

    Adam Varadi Member

    Joined:
    May 3, 2014
    Messages:
    156
    Likes Received:
    17
    I opened the propably damaged file with excel, and then exported it.
     
  17. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,377
    Likes Received:
    1,162
    The last log fiile, SYNLog-08-58-50.csv, shows a status of "Fail" going from 0 to 1 in data row 14.
    What I'm trying to figure out is whether the last two files, SYNLog-08-55-15.csv and SYNLog-08-58-50.csv are really from the same flight? There is data corruption in the first few rows of file SYNLog-08-58-50.csv that suggests that this file is a "continuation" of SYNLog-08-55-15.csv -- but that's something I've never seen before.

    Andy.
     
  18. Adam Orens

    Adam Orens Member

    Joined:
    Oct 7, 2015
    Messages:
    60
    Likes Received:
    3
    1 minute of missing logs somewhere.....:mad:
     
  19. Adam Orens

    Adam Orens Member

    Joined:
    Oct 7, 2015
    Messages:
    60
    Likes Received:
    3
    The last log appears to have the copter on the ground if Im correct.
     
  20. Adam Varadi

    Adam Varadi Member

    Joined:
    May 3, 2014
    Messages:
    156
    Likes Received:
    17
    I can make a video of how I copy and upload the files, or even let someone use remote desktop to check them.
    I really just want to figure out what happened. And by the way I really need this copter to work.
     

Share This Page