Hey Craig,

I'll take a straight edge and check the plane of motion between the arm and horn. Just eyeballing it, they sure look to move in-plane. A ball link may introduce an offset, as you suggest.

I think you guys are right about the buzz being related to the resting load of the flap on the servo, especially since I can reduce or even eliminate the buzz when hold a little 'up' pressure to help the servo out, so to speak. I do want to know this amp draw, but it will be a few days before my meter shows up. Even if it turns out the buzz is nothing to worry about, it sure is annoying. I end up dropping the flaps to MID just to shut 'em up while I'm tinkering with other things

RC

=========== EDIT =============

Ok, here's the latest with what I found: I carefully measured the servo arm travel plane and the flap control horn plane, and they are not in-line, or even parallel. Then, using the horn as a baseline, the offset of the horn rotation plane from the servo arm grew/diverged at the arm as the servo/flap moved to flaps full-down. After some head scratching, I decided to try a ball link at the servo arm.

Well, the servo buzzing is much less pronounced, or even sometimes none at all. I definitely think what buzzing there is now is due to the weight of the flap itself. It seems clear now that some of the buzzing was from the servo working against the resistance in the clevis/linkage due to the misalignment between the horn and servo arm. When the amp meter gets here, I'll know for sure if the draw is minor now and not a worry.

Speaking of that, what is a "minor" current draw? What amount would be cause for concern?

Thanks.