Making the dihedral of the wings (which is polyhedron) and the rudders.
I always start by the middle of the wing, I'll even break some fibers warping step ca ai ai and let dry again ca.
The rudders are at right angles as it is harder to break down some fiber, so sometimes I have to for a few props, this case did.
[/URL][/img]
[/URL][/img]
[/URL][/img]