I've been told by a couple of experienced designers to eliminate 80 to 100% of the dihedral. Having that much stock dihedral causes the ailerons to fight the wings. I was also told to make the ailerons(if not using strip ailerons) 25% of chord and about 25% of span. On a 48" spanned Kadet Jr I'm building(from plans, the kit has been discontinued[]), I have extended the span to 54" with 2.5X8 inch(approximate) ailerons. I also deleted ALL of the dihedral(1.75 inch), giving a continuous main spar from tip to tip. The wings will have individual aileron servos and be fully sheeted for added strength when finished as well.