Heres a vid of my first flight with my pbf. The biggest coroplast i could find was 18in. Its 18x18, OS Max-S 35, 9x6 prop, 3ch throttle, rudder, elevator. It flies great but i got over confident and tried to come into a hover and crashed it. BTW this is my first nitro plane flight also
http://www.youtube.com/watch?v=gipbJJosOZQ