Fromt he Futaba website

3. What is Exponential and how do I set it?

Exponential is an adjustment to the actual curve of how the inputs are given to the servo in relation to how the stick is moved. Without expo, the servo gets exactly the same amount of movement command per millimeter of movement of the gimbal regardless of the gimbal's position (center, or extremes, for example). Many modelers use expo to soften the feel of the model's response around center to avoid over correcting. It is also recommended to add additional negative expo to high rates so that the high and low rates give similar distance of travel around center. This is helpful to avoid overcontrolling in panic situations or when changing rates.

Exponential is set independently for your 'high rate' and 'low rate' (called dual rate), by flipping the switch, just as you did setting the two dual rates.



Set up depends on which radio you have