If that's the case, then that would be scenario 3 of the attempted dihedral description above for airfoil tapered symmetrical wings. The fact that the Phoenix series (most of them have swept wings I believe) seems to require additional dihedral from a flat top wing, makes me wonder whether this is due to the fact that the wings are swept back. A wing with a 1" gap under the center over a ~63" span is not a great deal but it still ends up being an anhedral wing when the model is flying inverted. I wonder how the P8 fares inverted in this respect.

Since there are few flying or soon to be flying P8's around and about, perhaps each builder could describe their wing and how the planes behave in flight. We've seen Kevin's P8 flying in videos and it looks like an excellent flyer!

David.