It seems to me that the selection of an airfoil section is just the first step of a design process. These sections are generally presented (on airfoil websites) at what they consider a zero angle of attack. The section is seldom (maybe never) actually put into an application at zero AoA. It would first be set to the "design" angle and THEN the wing DESIGN process starts. In other words, using the section at the DESIGN angle, the rest of the wing is designed, with dihedral, washout, etc. THEN established.
The assumption that a wing "section" should be assumed from the start to be at zero is flawed.
Last edited by allanflowers; 09-14-2018 at 12:56 PM.