c-grain,

Yup, any airplane can be made to knife-edge, it's just easier with a taller fuse and a canopy up front.

Some of the new 3D models have a new feature, vertical fins on the wing ("side-force generators", I think they're called) for the same reason.

Hey, thanks for the tips on flapped airfoils, & the pix of your other original designs ... you're definitely thinking outside the box. Cool!