Okay, I am confused/lost. The pictues show the normal dihedral for the Kadet Sr. w/ ailerons definately not a straight wing with "no" dihedral. Are you wanting more dihedral like the Kadet Sr. kit without ailerons? The 3 channel kit has all that dihedral so when the runnder is used the plane will have more roll coupling with rudder to make up for the lack of ailerons. That plane with more dihedral would fly awkwardly due to it having ailerons I think.