Well i took out the dihedral in my superstar 40 (RIP), and it was a very good flyer. It was almost like flying the ultra stick, like 2slow mentioned. After taking out the dihedral it did some rather axial rolls instead of the barrel rolls it used too. I used it for just a throw around plane, until i dumb thumbed it in the ground after a low inverted pass. (flat bottomed wings are not good for loooong inverted flight)