Differential Geometry
last updated 3-9-2006

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In the left column you see the servo versus control lever move in a linear amount. The column on the right shows that the servo arm moves a different amount then the control lever. With the arm/lever in opposing directions some of the control movement is lost in sideways motion. The feel of this type setup is a *negative exponential meaning more sensative around the middle and less sensative toward the end points.
*some radios have an opposite meaning to this. Futaba is one such brand, the effect would be termed positive expo with that radio.