I built this Edge from 3 and 5mm Depron. Span is 70 cm, weighs 320g, 3s lipo, GWS 2208/18T with GWS 9x4,7 prop. Wing has hollow symmetrical airfoil.

Edge 540 (2 min 54 sec)

At the end of a rainy day, I had a lot of fun with my Pup:

Sopwith Pup 3D (3 min 34 sec)