Hello, I had to get in on this one. I understand what Crashnburn is going thru. I have scratched em for years but just now decided to scale up a few and having a heck of a time making a decision on the rib thicknes. The one that I'm scaleling up is by chance a Cunningham bird.

It's a normal 60 in. wing and I'm taking it to 100 or 120 in. That would make the rib or wing thinckness over 4". I just don't think this would be good. It would be quite draggy. Does anyone have a rule of thumb for this one? Thanks Hooker53