I would think this plane's take-off roll to be so short, there would never be a need to take off cross-wind!

From what has been stated here, the wing failure appears to occure at the polyhedral break. I have built a 1/8th inch thick plywood diehedral sheer brace which runs through the polyhedral break in the spars. This plywood sheer brace runs between the last rib bay on the center section and the first rib bay on the outer section. I am going to continue balsa sheer webbing out to W-8 or W-9 on the outer panel, also.