Drone flipping mid-flight in the air while flying stable.

Hardware Pixhawk family
1

Hello,

I’m a student and my hexacopter - X is facing an issue while flying. It suddenly flips completely mid-flight.

image right before.

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the flip.

My setup is:

  1. Radiolink pixhawk with fmuv 3 and hardware:2.4.8 with dampner as well.

  2. Radiolink M8N GPS SE100 Module

  3. Radiolink power module 5.45V 2.5A

  4. Safety Switch

  5. Buzzer and microSd card

  6. 3S LiPo battery - 5200 mAh 40C 11.1 V

  7. 30A ESCs * 6 plus 1000Kv BLDC motors

  8. Flysky transmitter and receiver with PPM

The FC also reboots when crashed (is it supposed to?). I have changed the motors, ESCs, and uploaded new firmware again. There is no external load as of now. Propeller direction has to be correct, or else lift could not have been achieved at all. All calibration has been successful, and no issues are arising during arming. The positive wires from the ESCs to the Pixhawk have been removed to reduce electromagnetic interference, and there is no back supply to the Pixhawk. There are no soldering issues as well. Not able to figure out the reason behind the flips. Logs - Drone logs - Hexacopter - Google Drive

2

Update to latest stable ardupilot, 4.2 is too old.

Check FC power supply, there is unexpected voltage drop.

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You need to follow a manual to perform initial configuration, use AMC or official docs.

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3

You need battery logging to perhaps explain why the power to the Flight Controller was way below Brown-out voltage resulting in the FC shutting down. Before that happened the outputs were oscillating badly from some default Vertical Acceleration Controller parameters.

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