ORIGINAL: dbacque
The plans don't show the dihedral but the instructions state "turn the wing panels upside down and move the root ribs of both panels together. With the spar at the tip rib down on the building board, block the center of each wing panel up 3/8" of an inch."
Yes, it says 3/8" of an inch.
Dave
It's been over 30 years since I built the last dirty birty. Memory isn't what it used to be but heck, I was pretty close, eh?