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Differential control is used in many areas of radio control. In modern digital radio systems it is a standard function. However, it may be generated to some extent by expediant use of the control arms on a servo.
The following diagram shows that at the centre of the arms travel the distance moved by the control rod for a given angular change in the servo output arm is greater than at the end of the travel:
Off-setting the starting of the output arm on the servo will allow this differential movement to be used to advantage for ailerons where more upward movement to downward movement is required and also for engine throttle control where small adjustments around the idle position are required.
See also: Servo.