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The property of a modern radio control transmitter by which the amount of servo movement is varied with regards to the position of the control stick. Total throw is constant, but amount of throw can be varied such that a small stick movement produces very little servo movement, but moving the stick to its limit produces a larger proportional movement of the servo. Expo is used to tame "twitchy" or sensitive aircraft and help with precision flying.

To reduce ('soften') the servo movement around the center of servo travel requires positive exponential on JR and Spektrum transmitters, and negative on Futaba.

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