Dual rates are commonly used to set up models for different flight performance.
Dual rates cannot increase surface travel. They only reduce travel. One rate setting
for a control surface normally allows for full travel. Other rate settings for that
surface reduce the travel available. For example, on an aerobatic model with large
control surfaces, high rates are used to deliver full control surface travel, which
is useful for extreme aerobatics. Low rates are used to reduce control travel, so
control response is reasonable for normal flight and landings.
Exponential affects control sensitivity around center but has no effect on overall
travel. Positive exponential decreases the sensitivity around the center of gimbal
movement. Use a small amount of positive expo to compensate for the rotation of the
servo horn, achieving a more linear surface movement. Adding more expo softens the
control response toward center stick, making smoother, more precise flight easier.
Program each control (rudder, elevator and aileron) individually.
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