ORIGINAL: UpnAt0m
Okay i will double check that when home from work, thanks britbrat. I only have about 2 clicks of aileron trim and about 3 of elevator from memory.
So is it caused by just the motion of the plane with a out of trim rudder? or propwash over the out of trim rudder?
With that kind of set-up error, the control surfaces are essentially fighting each other & there is a fair bit of vortex-shedding from the offset controls. As vortices break away & re-form/re-attach the oscillatory motion results.
That is not necessarily your problem, but it is a possibility.