Crash during Autotune: CUAV X7+ Flip & Vibration Log Analysis

ArduCopter Copter 4.6
1

I experienced a crash while performing Autotune on a CUAV X7+ running the latest firmware. The drone flipped unexpectedly. Could you please help me analyze the logs to determine if this was caused by gyro noise or another issue?https://drive.google.com/drive/u/0/folders/1eebj3bch4JSViWDy0sU-W9vDCCtcuNRa

2

Remove the access requirement for the link.

3

Also tell us what components you’re using. Motors, props, ESC, Frame. Etc.

4
  1. Motors: T-Motor MN501-S 300KV
  2. ESC: Hobbywing 40A
  3. Propellers: 24-inch foldable
  4. Flight Controller: CUAV X7+
  5. Total Weight: 5600g (5.6 kg)
5

Looks like motor 4 failed.

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Check the motor, ESC, wires, prop.

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6

Suggest you get current logging working.

7

@dkemxr @Allister thank you for the reply.

Post-crash diagnostics involved a comprehensive motor spin-up test and ESC signal verification; all actuators were confirmed and to be operating nominally. Analysis indicates that a mechanical or electrical failure of Motor 4 would typically trigger a ‘Potential Thrust Loss’ error within the flight controller logs or in messages. However, the data reflects no such anomaly, suggesting the motor was responsive up to the moment of impact.

8

I’m not sure what the trigger is, but we don’t always see the “thrust lost” message.

Consider the possibility of a desync, or intermittent problem such as a bad solder joint or connection.

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