Reducing dihedral to a point on a high wing cabin type is OK but totally flat will result in a poor flying airplane. When the wing is on the table I would go no less than one inch at each tip. Now if you go past flat into droop (anhedral, the airplane will once agine become a pleasant flyer and impart nice roll charactistics.


Doing anhedral on a high wing cabin type will put the airplane closer to that totally neutral roll stability point (the point most refer to as the stays where you put it feel). This is the reason most low wing aerobatics types have slight dihedral to acheive that neutral point, its the opposite of high wing cabin types.

John