If you are confused from the previous posts about the siffeners and what they are used for, perhaps these last pics will help clarify. Here they are clecoed to the skin on one side. When the rudder is finished each side of the skin will have its own set of stiffeners. You can see how they taper to a small point or edge as they move further back towards the end if the rudder, and are wider at the front. The angle is used to counteract any torsion moments of the skin, and is the real reason why the term stiffener is used. If you simply applied a strip of aluminum without the angle to the inside of the skin, you would not get the same stiffening quality that is needed here. As more of the rudder comes together you will see how these parts interact with the rest of the structure.
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