When I got into combat...every way concievable to strengthen a balsa plane was being tried...C/F, Kevlar, even thin metal strips inside the L/E..you name it, against another balsa plane it was devistating. Then along came the Battle Floyd (Foam)...and once again, with the proper use of fiberglass/CF/Kevlar/RSN/etc... any balsa plane no matter how well armored was toast. Then along came Spads built from Coroplast (US Aircore type construction) and they enjoyed a wonderfull couple years of dominance turning Floyds, Raptors, and anything balsa into nothing but land fill. If you don't know about Spads, just think of US Air Core and how tough they are. Today's combat planes will fly right through one without even coughing. The only difference would be that a Coroplast combat plane only breaks into 3 or 4 pieces...a Balsa combat plane, no matter how well it's reinforced or what materials are used, will EXPLODE into a million pieces. It's really cool to watch.