RC3 not neutral

ArduCopter
1

When using sprung centred RC system there is always prearm error that to keep the RC3 to low position when trying to autotakeoff from GCS.

How to avoid this keep rc3 to low position for auto takeoff from GCS…is there any parameters available for this to do ?

2

There is a bit for that in RC_OPTIONS parameter

bit 5: Arming check throttle for 0 input

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3

You should use
PILOT_THR_BHV,1
with a spring-centered throttle. I use 7 for that parameter.
See if that helps.

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