Abrupt fail of all motors


I did 2 flights today and on the second flight suddenly all motors stopped and I had a total crash…

Can someone help me with reading the log file?

thx you very much for any help


Here is an Auto Analysis of your dataflash log:

Size (kb) 1990.798828125
No of lines 25870
Duration 0:01:26
Vehicletype APM:Copter
Firmware Version V3.3-rc5
Firmware Hash 43a3d0cd
Hardware Type
Free Mem 0
Skipped Lines 0

Test: Autotune = NA -
Test: Balance/Twist = NA -
Test: Brownout = FAIL - Truncated Log? Ends while armed at altitude 11.30m
Test: Compass = GOOD - mag_field interference within limits (7.73%)

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: 1.15, WARN: 0.75, FAIL: 1.50)
Test: Parameters = GOOD -
Test: PM = NA -
Test: Pitch/Roll = NA -
Test: Thrust = NA -
Test: VCC = GOOD -


Looks like a power failure, but the voltage in the log looks unusual.
Starts off at 17v, goes up to 19v when you increase throttle and goes up to 20v when you increase throttle further.

It looks like you asked for 100% just before the power failed?

Hi, no I did not ask for 100%, at least not myself cause I was in AltHold mode when suddenly the motors stopped…

I had to build everything new and I just changed the power module. We will see what happens…

thx for your first analysys