Hi All, what might be the reason for this crash? It was a tarot 690 with TMotor MN4006 KV380 paired with EMAX bullet series 35A ESC. It was on a BVLOS mission of 100m altitude during crash. I found that PWM of C1 motor raised to max while C2 motor dropped to minimum. I have attached the bin for your reference.
Thrust loss on Motor 1, Motor 2 dropped to stabilize and down it goes.
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Hi, thank you for your response. After the crash, we tested each motor and ESC individually, and all were functioning correctly. Additionally, the propellers remained intact and attached to the motors. However, we observed that one of the wires connecting ESC to Motor 1 was found disconnected. We’re uncertain whether this disconnection caused a thrust loss during flight, or if the wire became detached as a result of the crash.
Bad solder joint or bullet connectors?
That’s easy to determine. Add Barometer altitude to the Rcout graph. Where was it when thrust was lost?
That answers your question. Thrust loss on Motor 1, Motor 2 dropped to stabilize and down it goes.
It was directly soldered to the ESC pads and no bullet connectors were used. To mention, motors came with a single core solid conductor. Even the soldering was good without any cold joint. The wire broke between the solder pad and the wire sleeve. We assume it may be due to cyclic fatigue. Have a look - https://www.youtube.com/shorts/uBWI4NnA7EQ