There is a thread here in the beginners forum about two elevator servo's. There are a couple of posts that suggest putting the two servo's on, one on each side, using the up vertical servo arm for one elevator side and the down servo arm for the other elevator side.

I'm sure people like RC Ken, Bruce, and MinnFlyer (Mike) (and, not to slight others, but I'm sure there are more) have done this at least once in their RC career.. and has something to say about this.

My question is this: Will this cause some sort of differential in the operation of the elevator, favoring the up side of the servo arm with more movement than the down side? (consider the angle that the control rod from the servo hits the control horn)

Dick.