mcarleno,

Yeah, I typically think of full-scale aircraft when I think of structural design, and their ribs are beefier.

I also looked over my post again and neglected to mention that there is a shear stress in the shear web that runs spanwise, and at the center it's as much as the vertical shear stress.

But, I do agree that the ribs in a model are typically cut with the grain running horizontal and are very weak in the vertical axis. There shouldn't be a huge load in that direction, though....not with the primary load being that of bending of the wing.

In the case of my Eagle wing, the shear web didn't do a thing in the bending failure because it was vertically oriented.

I'll look into it further.

Maybe I'll just put some bi-directional fiberglass on the existing shear web at 45 degrees.

--Rich