Marc,
You did a fantastic job on the UCD review! Contgratulations!
But my UCD was already built and flying before your review was posted.

I agree 100% about using 4-40 pushrods on the ailerons. I never even bothered to try the 2-56 pushrods because of the distance between the servo and the aileron horn.

Just like you, I also used the 2-56 pushrods for the elevator and they haven't been a problem. But I mounted both of the elevator servos 180 degrees from yours in order to keep the pushrod geometry more symmetrical.

With that large of a rudder, I skipped the rudder pushrod and went with a pull-pull with the servo mounted on the bottom of the fuselage.

Today is the first Sunday in three weeks that it hasn't rained so I can finally resume flight testing of several different mousse cans to try to get more power out of the ST 90 while reducing the weight. I've been tempted to put a TT 120 in the nose since it weighs exactly the same as an OS 108. But so far the extra 1/2 pound of dead weight and the already-too-nose-heavy issue have stopped me.