Well, Paul. That don't work. Last night, mentioning this to a friend last night, he found an old book by Commander Whitehead of the U.K. on how to set up the differential throws. This has been known for perhaps twenty years now, but I never saw it in print or diagram. Part of your idea is correct, but the remainder is otherwise infeasible.

The situation of placing the pivots on the near side (or interior side) of the servo is correct. However, what you have shown is only applicable to one servo and for one aileron. What would be needed to be located is a beam arm of included angle of about 130-140 degrees. Not 180 as most commonly available today. The angle between the pivots and the center rotation spot, must be less than 180 degrees to obtain ANY amount of differential. It is this interior Vee angle which give the differential to BOTH push rods, not just one. There are so many servos on the market today, that even if there was such a thing as a Vee shaped beam aftermarket arm, it would be obsolete next month. Read original note.

Furthermore, in the caption from the book, it indicates that the connector link (wire) from the servo MUST be at an angle greater than 90 degrees for this principle to work. The push away from neutral and the pull to from neutral is known, nd only way to add more or less differential is to make the movement at an angle. Leaning over the torque arm will emphasize the movement even more. Your diagram is drawn near perpendicular, which makes the fore-aft movement exactly equal to that of the servo displacement.

Wish I would have located that book earlier.


Wm.