Aileron setup

Aileron horns and pushrod are basically the same as in elevator halves.
Horns are from balsa-CF composite and they are glued to control surfaces with Cascol PU glue.
Pushrods are 4 mm CF tube with 2 mm treaded steel ends glued with Super Epoxy. There are ball links in both ends to minimize slop.
I will use Futaba S9101 servos as I have them. I do not have special low profile wing servos so I had to lay servos on side.
It may surprise someone but the horn setup shown in the picture does produce very equal deflection on both sides with absolutely no differential.
I will program differential with the transmitter if it is needed. It is alot easier to do that way.
The horns are as long as reasonably feasible to reduce slop and decrease both slop and actuating forces. That helps to get accurate feel.

 

Click to see a larger picture Aileron horns cut of from balsa-CF plate.
Click to see a larger picture Horns already in place.
Click to see a larger picture The same from another angle.
Click to see a larger picture Servo is mounted on a detachable plywood shelf. There is a plywood plate glued directly on foam
with expanding PU glue. The shelf is bolted on this plywood plate. With decent lightening holes the shelf
and plate weigh 8 g and the pushrod with end 3 g. Note that servo side is flush with wing surface.
It would be relative easy to add a balancing weight if necessary.
Click to see a larger picture I might consider a transparent cover to show off a bit. We'll see.
Click to see a larger picture Aileron fully deflected. Even though the horn is leaning forward there is no differential at all. Also the servo
horn is leaning forward in neutral position. This is needed because aileron horn is 43 mm and servo horn
16.5 mm long. If you are using a wing or any other servo in upright position be sure to install aileron in
90 degrees angle with the plane where servo horn moves..
Click to see a larger picture Servo lying in its cavity. I will not put any balsa on the sides as that does not bring any value to the installation
I will only paint it with a paint that does not attack foam. Balsa sheeting is 1 mm reinforced with thin fiber glass.
The bottom plate is glued on foam and sits there very firmly.