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Using servo for heat valve control

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I have a full scale airplane that I am finishing and it uses a small HVAC butterfly valve to control the hot air coming in to the cabin. This could easily be controlled with one of my RC servos. I found some plans for a voltage regulator 12-5vdc. I thought a RC Servo tester with a POT on it would be perfect to open and close the valve.

This would mount in my center console much like a temp control in a car.

I would rather buy one, but do not know where to look and wonder if some of the more fragile RC testers would hold up?

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