Yeah don't get me wrong, I'm keeping the fins. I was just making the point that there's something about the KF airfoil that supposedly makes them yaw stable all on their own. So I figure my current fins might be good to go if that's the case. I may still play around with them, possibly enlarge the fins on the ducted-fan too. I could model this in X-Plane & see for sure I guess. My feeling is the design is good to go but a couple of people have commented on the fins now so yeah maybe I'll look at that some more.

Weight is an interesting subject. I'm actually leaning towards ballasting the heck out of this. I'm not interested in a light-air floater here. I want something that'll rip when the winds up, something that'll have a good amount of stored inertia to carry her through some big maneuvers. If you've flown the Plank fully ballasted in PicaSim, that's what I'm looking for here. So yeah I'm liking the new double CF spars, foam-board/cloroplast laminate design. I think at only 40" long that'll produce a bullet-proof little wing for sure. I like some of your ideas too, as you said, infinite solutions.

Yeap Scott, the fuselage will be glassed. I'm planning to carve a foam plug of the fuselage then fiber-glass/carbon-fiber/kevlar that, cut out a canopy/battery hatch & then remove the foam. That'll leave me with a nice strong fuselage for those not so perfect landing areas at the slope. I've been meaning to give that technique a try so this is a good opportunity to play with that.

Hope to get the build started soon, fun fun.