Dave.....

Let me expand on what DB said. Yes, both the servos move in the same direction. But you generally install wing servos either surface or on a plate. Surface mount, the servo arms would come off opposite sides of the servos. So when one arm moves foward, the other moves back. With plate mounted servos, they're generally mounted either facing each other or away from each other. Same deal as with surface mounts. The only time the servos would ever be mounted pointing in the same direction, or with the arms coming off the same side, would be for flaps. Sorry if this dosen't seem to make much sense. As soon as you look at an airplane with dual alieron servos it will fall into place.


Andy