John Cole Posted December 31, 2011 Share Posted December 31, 2011 There is another (classic) reason for using an idler system: If the length of the servo arm between the 2 holes used is different from the distance between the 2 holes used in the control horn then the two wires are not parallel. If that's the case then when the servo arm rotates the tension in the closed-loop lines changes (increases) putting extra side-load on the servo. I tested this using a mock-up with very different length "arms" and pulled the (pretend) servo shaft (a nail) right out of the wood. It's pretty easy to work out from simple geometry that it's true, but I found seeing the nail come out was more convincing! This I believe was the original argument for using an idler arm, but note that the hole-hole separation on the idler arm and that on the control horn should be identical, and that the idler arm and control horn should be parallel. Quote Link to comment Share on other sites More sharing options...
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