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In my sketch I show two cables going from servo to rudder. The bottom cable travels in a straight line, and is as short as it can be. The top cable takes a path around four pulleys, then on to the rudder. As you can see it makes no difference how long the upper cable is compared to the bottom cable. If the servo arm moves 1/2 inch, the whole cable will also move 1/2 inch, therefor the rudder horn will move 1/2 inch. The geometry doesn't lie.


Lm