So I maidened my DVa yesterday, had just about gotten it trimmed out when the wing folded. This was basically in straight and level flight 5-7mph breeze w/ 10mph gusts. I suspect the weak spot was the lower wing since there is a fair amount of overhang in the center section created by the fuselage which probably doesn’t get nearly as good layer adhesion as the straighter parts of the wing. Seems like adding space for a 3-5mm carbon tube would beef things up quite a bit. Disappointing as things are. 🙁