My Funstar also fishtails. It fishtails no matter what direction I'm flying with respect to the wind. This is not a fast, slick plane - it has a very thick, constant-cord wing. The fuselage is about medium sized for a 40-sized plane - maybe a little longer than most. My rudder pushrod setup has no slop. On its maiden flight it required very little trim of any kind to give me straight & level flight. I've seen other Funstars fly and they don't exhibit this fishtailing problem. I'll check whether I have ailerons working against rudder, but I doubt if that's the problem since so little trim was required. Anybody got any more ideas on what might cause an otherwise well-flying model airplane to fishtail on straight and level flight?

==Mike==