I had a bad maiden flight yesterday. Gear list:
- Custom frame, very similar in layout/size/design as the DJI S1000
- DJI e1200 Pro propulsion (motor/esc/prop combo). These ESCs require manually setting the MOT_PWM_MIN MOT_PWM_MAX PWM range [1050, 2000].
- Pixhawk w/ AC 3.4.4
The maiden flight was done in loiter mode, with the intent that this would be more stabilized than AltHold or Stabilize modes. Should maiden flights always be performed in Stabilize mode? By going straight to loiter, did I prevent the system from auto-learning something?
The flight was short (30 sec total?):
- Immediately started rapid toilet bowling: maybe 0.5 to 1 revolution a second. The copter spun in this manner all the way through to crash.
- Copter kept increasing in altitude, despite me cutting out throttle entirely.
- Copter eventually inverted and quickly descended with a hard impact.
- Flight path was an arc, almost like a rainbow in shape.
- Compass cali was done just prior to flight, using onboard cali.
- Accel cali was done in the shop
- Confirmed correct motor order in shop (using MP motor test)
- Confirmed motor rotation and prop directionality just prior to flight
- Prior to lift off, I rev'ed up the motors but not enough for lift off; I examined those logs and everything looks normal. (happy to upload this log as well).
Looking at the logs and auto-analysis, it looks like the primary cause was magnetic interference with the compass. Can I get a second set of eyes?
What could I have done to prevented or mitigated the outcome of this flight?
- I've heard of some people having a kill switch on their radio.
- How can I test magnetic interference prior to maiden flight?
2017-02-17 16-36-15.bin (583.7 KB)
autoanalysis.txt (1 KB)