Is there something I've missed to pass through the throttle single from the receiver to the ESC?

The ESC beeps continuously when armed.

I'm using QGC 3.0.2 with the Flying Wing/Skywalker X5 Firmware 1.5.1dev.  The ESC calibration seems to work though QGC - 6 beeps which matches what the manual says ( 3 beeps for 3S battery + 3 beeps for ready).

The ESC is a Overlander XP2 40A SBEC.  

With the plane armed, the aileron servos work fine but the motor does not spin, just the very loud beeping from the ESC.

I've tried measuring the external battery voltage and recalculating the multiplier, changing the ESC connectors about and multiple different batteries with all the same symptoms.

According the the Overlander manual, continuous beeps mean that it's not getting a throttle signal.  The ESC is plugged in to pin 3, next to the servos. 

The transmitter is a FlySky i6 with an iA6B receiver using PPM.

Thanks, Tim

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