While certified airplanes have to meet Part 23 requirements for positive dihedral, amateur-built airplanes are exempt. Ed Kolano looks into the details of dihedral, and how you can use it to your airborne advantage.
Stall flutter is the result of the elastic axis of a wings surface being aft of the aerodynamic center, resulting in instability. A vicious cycle of lift, twist, stall and lift may ensue.