Kewl.....

It's always good to hear from someone who knows.

If I understand what you're saying, reflexing both of them up actually give the airplane "literal" aileron differential. Good deal. There had to be a reason. In practice you get a differential aileron effect.

But why not simply rig the servo/connectorrod/horns to give differential. Seems it's easy enough to get "real" differential if that's what you want. I guess I don't understand why it would be better to get a differential effect that way, when its' simple to get it directly and keep the airfoil shape "pure".

I've been helping a buddy fly his 120 four star. He has an 80 on it. He needs a BIG airplane to be able to see the model, and needs a slower flying model as well. And I wind up getting to fly it a fair amount of time. It really shows how the design handles around the bottom of the envelope. We've recently had reason to recover the wing and in the process needed to setup the ailerons all over again. We wound up having them both rigged down and both rigged up. (obviously, at different occassions ) And with both those riggings, that big old thing flew like a pig. I got no idea how it would have flown with decent power, but I do know the design didn't seem to benefit from either rigging. Truth is, after reading your posts and knowing the quality of the info, I'd really like to fly that big thing with a 120 on it now. And I plan to suggest to him that we rig 'em up a bit and see how it flies.