ORIGINAL: cruzomatic
I'm building an Extra 300s and the manual states to put positive dihedral into the wings. That means the wing tips are higher than the root right?
The P40 Warhawk has dihedral. You can also call it positive dihedral.
The Cheap $40 trainer has anhedral. You can also call it negative dihedral.
Typically, purely aerobatic designs have very little dihedral. The most modern ones have none.