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Old Oct 20, 2009, 10:00 AM
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Extremely Twisted
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United States, NH, Epping
Joined Oct 2005
2,661 Posts
Digital servos buzz when there is any load on them at all. It is natural for the control surfaces in any airplane to have light resistance towards the extreme end of their movement.

I would try this: First, make sure that the distances between the holes on the rudder servo horn and the holes on the rudder horn are equal. Set the EPA or DR so that the rudder will see about five or ten degrees more than it sees right now (if you are currently at 100%, this might be 120-130%). That will make a big difference. Now hold the rudder stick hard over and apply light pressure with your finger to the rudder in the same direction as it is moved (ie if it is deflected to the left, push it further to the left). If light pressure makes the buzzing go away, you'll be fine. It it requires lots of pressure, or it the rudder itself deflects significantly before the buzzing goes away, then you need to check your geometry and find what is binding.

But definitely try to use more than 100% of the servo's throw if possible. You will have more torque and more resolution, at the expense of some speed, but that servo is really fast so you probably won't notice it.
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