I agree to Jon and Thinn as others stated.

I followed through the thread, but I don't think anyone actually said diving problem during inverted flight. Did I miss something??

Of all the planes other than 3D planes, pattern planes dive the least during inverted flight. With a slight push on the elevator, most plane should stay level unless the wing has lots of incidence and/or semi-symmetrical or flat bottom airfoils.

Electric version Osmose 70 has removable two piece wing. I am waiting for one to build next year.

Ihncheol