help a/c rolls opposite ruder input

[osprey]

what is going on I'm at a total loss to figure it out ?
other than this bug it flys great

heres the problem with the plane
when it is given right rudder it rolls to the left
when given left rudder it rolls to the right
it dose not matter if I'm flying level or trying to knife edge

none of my other a/c do this
what in the world is going on

and what must be done to fix it ( and don't say to use coupling in the radio )

it is an ultra sport 40+
i did have the ultra spot 40 that did not do this ( lost it do to radio failure :( )
and it did not do it

[MCarlton]

Couple of options;

Saw the wing in half and increase the dihedral

Modify the rudder to add more area below the datum line

Either that or just practice until balancing the rudder with aileron becomes second nature

[JetPlaneFlyer]

Yeah, this is typical for a low wing model that has no dihedral. The solution would be to add a little dihedral. Easier said than done though :(

[Brandano]

you could add some dihedral in the form of winglets, I think. It will reduce the roll rate slightly, though, and make it more nervous in yaw

[vintage1]

Fly it upside down :D

[osprey]

upside down dint work ether does the same thing

[MCarlton]

Are you using a computer radio? If so, is it possible that you've accidentally programmed in some aileron with rudder?