C-130 Dihedral

In response to a discussion about C-130 wing dihedral:

The outboard wing panel had 2.5 degrees of dihedral, probably measured at the trailing edge.

 Note that this drawing is from a Lockheed C-130 (no revision letter) so it shows an outboard location for the external fuel tank.

As a result, the wing was not flat across the top as shown by the red line in the front view above and by comparison of the airfoils on the side view here, at least statically when there was no fuel load:

Some say that when the airplane was fueled (all of it was in the wing, most in the outboard wing panels) that the wing was flat across the top.