Crash log help

Was fighting the wind and the hexa just fell out of the sky.

Did auto-tune earlier in the flight and everything up until the crash was working without issue. … sp=sharing

Here is an Auto Analysis of your dataflash log:

Size (kb) 11023.90625
No of lines 159989
Duration 0:10:40
Vehicletype ArduCopter
Firmware Version V3.2.1
Firmware Hash 36b405fb
Hardware Type
Free Mem 0
Skipped Lines 0

Test: Autotune = GOOD - [+] Autotune 13034-57340

Test: Balance/Twist = GOOD -
Test: Brownout = FAIL - Truncated Log? Ends while armed at altitude 10.58m
Test: Compass = FAIL - WARN: Large compass offset params (X:-298.00, Y:-207.00, Z:48.00)
WARN: Large compass offset in MAG data (X:-298.00, Y:-207.00, Z:48.00)
Large change in mag_field (46.33%)
Max mag field length (616.80) > recommended (550.00)

Test: Dupe Log Data = GOOD -
Test: Empty = GOOD -
Test: Event/Failsafe = GOOD -
Test: GPS = GOOD -
Test: IMU Mismatch = WARN - Check vibration or accelerometer calibration. (Mismatch: 1.38, WARN: 0.75, FAIL: 1.50)
Test: Parameters = GOOD -
Test: PM = FAIL - 62 slow loop lines found, max 11.08% on line 54281
Test: Pitch/Roll = FAIL - Roll (153.84, line 159844) > maximum lean angle (45.00)
Test: Thrust = GOOD -
Test: VCC = GOOD -

Looks like you may have had a brownout due to a low LiPo battery?


I think the brown out was when batteries were ejected from it reaching the ground.

The Auto Analysis indicates that the brownout occurred about 10.58m in the air?

I think that may have been dude to baro drift because the log shows the drop down from ~50m

Here is a graph of all the alt plots. Please do not assume that I haven’t gone and tried to do my own detailed analysis of the logs, So far i think i have ruled out power issues, user error, and computer mishaps over telemetry (doesn’t look like anyone accidently hit disarm.) Were are trying to utilize this platform as a method of geological survey over inaccessible terrain and need to have a system that will remain reliable until it has managed a ROI. I need help with the FMA of this crash as I don’t have enough experience with analyzing the logs due to every other crash being an obvious cause.

Alt … sp=sharing
Voltage and curr … sp=sharing

Does this look like it may be an ESC failure? … sp=sharing