Being evenly matched in speed and manueverability helps cut down on midairs. The most important thing to do to reduce the chance of midairs is to limit the planes' speed and fly close enough in so that you can judge where your plane is better. Any RC combat that I've ever flown above .15 sized is just idiotic high speed jousting where the question isn't IF but WHEN is the midair gonna happen? The lighter and slower planes do less damage to each other and to themselves in either a midair or a crash. So called SSC planes still miss the mark for what true SSC combat can be like. 40 ozs of plane acts like a piledriver on those poor little engines if you go in hard. I haven't tried electic power yet, but those pusher prop planes with the spongy foam parts look like great combat machines. I like .15 PAW diesels on old 48" control line foamies that I retrofit with a pair of fins and elevons. It is a simple conversion and the performance is just barely good enough to allow these planes to attack well, without building up excessive speed. 1/2A combat with either balsa or foam planes is very easy on equipment, very cheap, and the balsa planes are easily repaired at the field with CA and clear packing tape. The 1/2A planes can be built to weigh between 14 and 18 ozs very easily. I fly over 1200 minutes of combat with planes like these every year and do very little behind the scenes work to keep them going.