Please help me identify the cause of a crash

My rig is the following:

DJI F450 frame

DJI E310 propulsion system

4S 5000 mah battery

AUW ~1600g

My quad suddenly jerked when I was about to start my final descent and fell off the sky from a moderate height.

I am attaching a copy of my .bin log. Thanks in advance



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  • Sorry, Alvaro, but you haven't given nearly enough information about your machine to make an intelligent guess as to what went wrong however, a quick auto-analysis of your log file in Mission Planner indicated the following:

    Log File Z:\tmp\tmpCBA.tmp.log

    Size (kb) 1172.853515625
    No of lines 15020
    Duration 0:00:46
    Vehicletype ArduCopter
    Firmware Version V3.3.3
    Firmware Hash acf2e10c
    Hardware Type
    Free Mem 0
    Skipped Lines 0

    Test: Autotune = NA -
    Test: Brownout = GOOD -
    Test: Compass = FAIL - Large change in mag_field (94.85%)

    Test: Dupe Log Data = GOOD -
    Test: Empty = GOOD -
    Test: Event/Failsafe = FAIL - ERR found: CRASH
    Test: GPS = GOOD -
    Test: IMU Mismatch = GOOD - (Mismatch: 0.40, WARN: 0.75, FAIL: 1.50)
    Test: Motor Balance = WARN - Motor channel averages = [1500, 1461, 1595, 1496]
    Average motor output = 1512
    Difference between min and max motor averages = 134
    Test: Parameters = GOOD -
    Test: PM = NA -
    Test: Pitch/Roll = NA -
    Test: Thrust = NA -
    Test: VCC = GOOD -

    A graph of your log revealed huge spikes in your compass mag X, Y and Z values immediately before your crash so I would say your compass (and electrical interference) would be a good place to start.  See 'Compass Interference' in the below:

    Good luck

    Diagnosing problems using Logs — Copter documentation
This reply was deleted.


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