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Problems with 1 motor

I've got a serious problem with my rear motor.

 

Firstly I'm running ArduPirates code v1.0  I'm running telemetry with Configurator 1.22 to monitor the pre-flight.  I'm using the ESC and motor 850KV motors from the kit.

 

Front, left and right motors functioning as expected after arming the motors.

 

Left roll, right motor increases

Right roll, left motor increases

Back stick, front motor and rear motor increases, However according to the configurator just the front motor increases.

Throttle up all motors increase

 

Forward stick nothing happens. However according to the configurator rear motor increases

I disarm the motors and a few seconds later the rear motor by itself powers up and then goes full throttle!!!!  Sending a disarm command stops the rear motor.  This happen 3 times now.

 

So I've got a spare 880KV motor, I remove the 850 from the rear, and recalibrate the ESC on the rear.

 

Same problem, except this time on disarm the rear motor doesn't decide to go full throttle.

 

Anyone got any ideas?  I've only go 5 mins til I have to go with the wife on an island holiday for 5 days, so I won't be able to try and fixes til I get back.

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