Tony, thanks for the response. Maybe I should have mentioned it's a plane not a heli. I gave up on helicopters a while ago. Anyway, I'm starting out with the basics, a Harrier. Michael Wargo seems to feel that at maximum deflection, with no expo, your plane will fly erratic. So I think he feels that expo will smooth out the maneuvers. Not sure. It's like my Rare Bear. At 100mph, any stick movement you can see it react. I gave a little down elevator, very little, and nearly put it in the dirt.