Stablize Mode - Crash

Posted by Daniel Estes on June 27, 2014 at 7:01pm

I have been trying to get an APM 2.6 in working order.  Unfortunately, this time the copter crashed from 12 feet in the air and destroyed three Graupner props and a 8000 mAh lipo.  Note:  This is not my first UAV build.    

I have flashed, erased and update/reloaded the firmware, and calibrated many times.  I did the firmware and calibrations manually, and tried the Wizard and all of the setups displayed no errors.  Also, I have the Arming Check enabled.

This was a school project for my students, but it has become my project due to the unstable flight tests.   

I attached the (crash) tlog for review.

Thanks,

Dan

2014-06-27 15-18-15.tlog

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Replies

  • criro1999 June 30, 2014 at 5:17am

    I am not an expert in logs, but.

    It looks as a mechanical issue for me. From the graph you will see the pitch and roll are acting weird just before the altitude start to drop.

    Try to analyse the 'log' instead of 'tlog', it gives you more details. 

    3701771224?profile=original

    https://storage.ning.com/topology/rest/1.0/file/get/3701771224?profile=original
    • Daniel Estes > criro1999 June 30, 2014 at 6:24am

      Thanks for the reply.

      - Can not find the log.  I'm not sure why.  

      I assume if it is a mechanical problem, one of the following items could be a problem.

      1.  APM 2.6 - (- has been re-flashed and the firmware updated (many times) and calibrated (many times).

      2. ESC/s - The initial powering of the copter indicates no problem with the ESCs. All motors start and end at the same time when throttled.  Note:  After flights, non of the ESCs seem to be warmer/hotter than the others.  - all seem to be the same. 

      3. Motor/s - Checked okay.  Pre-flight tests (variable speeds up to full throttle)  

      4. Power Module - I had to change the Male connector on the PM.  It was defective and would not connect/power all lipo batteries.  - was very loose.  Could there be something else going on with the PM?  Although the battery current and voltages seems to be normal reviewing the tlog.

      5. Solder connection/s - Still testing.

      Note:  When the copter would twitch, it would roll (twitch) to the left and back (me - behind the copter).

      I need some more suggestions/recommendations.

      Thanks again.

    • Daniel Estes > Daniel Estes July 1, 2014 at 2:11pm

      Due to not finding a solution, 3DRobotics has been gracious to send a RMA for me to return and replace the APM 2.6.

  • Daniel Estes June 28, 2014 at 7:21pm

    Is there anyone that can look at my tlog who is more experienced in interpreting the graphs?  Based upon the Wiki I seem to be within the parameters, but I may be looking over something.  If so, I would greatly appreciate some assistance.

    Thanks.

     

    • Daniel Estes > Daniel Estes June 30, 2014 at 4:48am

      Has anyone reviewed my log?

      Thanks.

This reply was deleted.