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Old 04-25-2015, 07:02 PM
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Leave the spring in place. Tests have shown it takes very little more than idle current for the servo to hold against the spring. Metal gears probably a good idea but not 100% necessary if a good quality servo is used. In general, I'd recommend the same type of servo you are using on the control surfaces .... the throttle is as important as any function on the airplane. Just be sure you don't stall the throttle servo linkage against the stops on the carburetor or you can damage the servo.