Built two F450's now I'm trying an F550 but it tips over on takeoff attempt

I’m new to using DataFlash logs, I could use a little help :slight_smile:

Log File C:\Users\jimpi\AppData\Local\Temp\tmpFA6A.tmp.log
Size (kb) 1408.0205078125
No of lines 17887
Duration 0:00:51
Vehicletype ArduCopter
Firmware Version V4.0.3
Firmware Hash ffd08628
Hardware Type
Free Mem 0
Skipped Lines 0
Test: Autotune = UNKNOWN - No ATUN log data
Test: Brownout = GOOD -
Test: Compass = GOOD - mag_field interference within limits (1.97%)

Test: Dupe Log Data = GOOD -
Test: Empty = FAIL - Empty log? Throttle never above 20%
Test: Event/Failsafe = GOOD -
Test: GPS = GOOD -
Test: IMU Mismatch = GOOD - (Mismatch: 0.09, WARN: 0.75, FAIL: 1.50)
Test: Motor Balance = GOOD - Motor channel averages = [1305, 1279, 1284, 1298, 1292, 1287]
Average motor output = 1290
Difference between min and max motor averages = 26
Test: NaNs = FAIL - Found NaN in CTUN.TAlt
Found NaN in CTUN.DSAlt

Test: OpticalFlow = FAIL - FAIL: no optical flow data

Test: Parameters = FAIL - ‘MAG_ENABLE’ not found
Test: PM = GOOD -
Test: Pitch/Roll = GOOD -
Test: Thrust = GOOD -
Test: VCC = UNKNOWN - No CURR log data

Post a link to the .bin log file for help, Auto Analysis is not up to date. Did you perform a Motor Test in Mission Planner to determine if the motor order and direction are correct?

I was SO certain that I had the motors in the correct order (based on a diagram for F550 at DJI site) but I think you may have solved the problem! It appears that I have motors in the wrong order. Thank you very much for the quick reply!

The Ardu community is pretty awesome, I hope to gain enough experience to help someone someday :slight_smile:

Yeah the DJI motor order and rotation are different to Ardupilot.
Just mentioning it so others can see if they run into the same problem.

You beat me to it, I was going to post those graphics :slight_smile: I just went for a successful maiden flight! Thanks again everyone!