Moderator

Yet another crash log needs analysis help - AP2.76

Normally I'm fairly OK with log analysis but I'm not sure what I'm seeing here.

Had a crash this morning where I appeared to lose radio contact with the model while in Loiter and it crashed a few seconds later.

My failsafe is setup correctly and works 100% and even works now on the recovered model yet I don't see failsafe occuring and the logs look odd after the crash. The battery remained in the aircraft with the receiver and telemetry still working.
Everything looks happy until the crash and then everything flat-lines except Vcc:

3691088095?profile=originalThe log file looks odd but recovery took over an hour so not sure if that had an effect but it is attached in case as well as the tlog.

My last command was full up elevator a but the aircraft seemed to not respond, almost as if the APM had frozen, I still had radio signal though:

3691087967?profile=original

Any ideas?

2014-01-04 06-39-37SaturdayCrashTB.tlog

2014-01-04 16-11 47.log

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  • very strange, the log is a mess.  That would be interesting.

    do you use_air_speed ? (check parameter)

    Anyway - the log looped around and overwrote what was there before, but it's a very strange mess.

    To at least try to eliminate hardware failure:

    try to make a .log for few minutes, then check if it's sane, - then leave the plane logging for a few hours , let the log loop around, check then again.

    I wonder if the defective log can be a sign of hardware issues...

  • Please describe the crash, did it go bad from the moment rtl was engaged, or before ?
  • strange... the dataflash logs are all messed up.
    Is there an issue with MP 1.2.92 or is the dataflash chip on your board corrupted?

  • Ive been watching your recent struggles for a while now and I'm really surprised you aren't getting more attention. Especially for all the trouble you are having across the board with 2.76. I wish I could help you, but I'm trying to learn from your tribulations.
  • Moderator

    Interesting, from the logs the plane crashed at around 75km/h and suffered -20G deceleration!

    I think the telemetry radio signal got blocked by the crash site so that's why the lines go flat, still not sure why the crash though. This plane has had literally hundreds of trouble-free flights!

    Damage is surprisingly minimal and has now been repaired but I would really like to know the cause? Anyone?

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