Hello Luddite
I agree that stepper motors would be ideal and better than my suggestion of geared motors, I had envisaged such a system being operated via the 'flap' switch on the transmitter but a turning knob would give a greater range of turn.
Happy New Year John
Paul (Industrialist)
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Ash
Even better if the barrels rise and fall as the turrets turn…an easy thing to atchieve by using a cam but what do I know
Back to my playpen whilst the grown ups have serious discussions.
Paul 
Edited By Paul T on 03/01/2017 16:35:56