Rodney,
I'd challenge you to fly my Cub and NOT use opposite aileron once in the turn, but I don't want to lose the plane.

LouW,
Thanks. I've flown a lot though and always coordinate rudder. I start my turn with a bit of aileron (into the turn), then almost simultaneously) apply a little rudder to keep the tail in line with the turn, releasing both once the turn is established. Both controls are now at neutral. The Cub's turn will continue to tighten (into the roll/turn) unless I apply opposite aileron to prevent it. Not a lot if done early enough, but necessary throughout the turn.

It may well be inherent in this plane only (it's an 80" Thunder Tiger ARF that I bought from an RC magazine reviewer), or it may be something with the Thunder Tiger, but it is a real phenomenon. It's my first Cub, so I presumed it was more common than it now seems.

For those who are considering the causes, I can rule out sticking control surfaces, bad servos, or binding linkage for you. The plane is also "perfectly" straight, vertical stab and rudder are perpendicular to the horizontal stab, and the stab is in line with the wing.

I would believe that there's increased drag in the low wing which slows it further, thus tightening the turn, but the reduced lift on the high wing should prevent that. Oh, and there is aileron differential (more up than down), although maybe more would help.

One other thing; the wing does not appear to have a twist to it, and the affect is the same when turning in either direction.

Thoughts?
Dennis-