I have been having a serious problem with my large . It appears to do the toilet bowling effect.
But cannot be sure. the drone did fly ok about 2 months ago.
We changed added some components (which were all not power during this test) and even reduced the weight .
I was under the impression that was due to compass. Today I was in AltHold (supposed to use only barometer and accelerometer) mode yet got a serious toilet bowling and crash.
I added a shielding material (which is about 4 cm away from the board, just above the plate the ESCs are laid. Could this be the issue? As 2 months ago when it flew ok, it did not have shielding.
here is a video
https://www.youtube.com/watch?v=YSPWS525z5w
<iframe width="560" height="315" src="https://www.youtube.com/embed/YSPWS525z5w" frameborder="0" allowfullscreen></iframe>
I have also attached the log data.
Please need help in diagnosing this issue! Its doing my head in.
Replies
Removed the Pixhawk on that drone today and put in on a small quadcopter and updated the firmware to a quadcopter.
Calibrated the accelerometer, compass and radio.
The quadcopter flew just fine.
Also on auto-analyzing the file, via mission planner
Below is the result.
Log File d:\Temp\tmpA1D9.tmp.log
Size (kb) 910.0595703125
No of lines 11519
Duration 0:16:41
Vehicletype ArduCopter
Firmware Version V3.4.4
Firmware Hash 8a196281
Hardware Type
Free Mem 0
Skipped Lines 0
Test: Autotune = NA -
Test: Brownout = GOOD -
Test: Compass = WARN - WARN: Large compass offset params (X:-230.00, Y:257.00, Z:-121.00)
WARN: Large compass offset in MAG data (X:-230.00, Y:257.00, Z:-121.00)
mag_field interference within limits (2.91%)
Test: Dupe Log Data = GOOD -
Test: Empty = FAIL - Empty log? Throttle never above 20%
Test: Event/Failsafe = GOOD -
Test: GPS = WARN - Min satellites: 5, Max HDop: 3.41
Test: IMU Mismatch = GOOD - (Mismatch: 0.22, WARN: 0.75, FAIL: 1.50)
Test: Motor Balance = GOOD - Motor channel averages = [1049, 1049, 1049, 1049, 1049, 1049]
Average motor output = 1049
Difference between min and max motor averages = 0
Test: Parameters = GOOD -
Test: PM = NA -
Test: Pitch/Roll = NA -
Test: Thrust = NA -
Test: VCC = UNKNOWN - No CURR log data
Need some help interpreting it.