If you make the object to hit each others' planes, then you will be spending 10 times the amount of your free time fixing planes, than you do actually flying. If you want to play with EPP slope soarer planes, they take the most abuse, but they aren't dirt cheap either. The best way to go would be with SLOW STICK type planes that are towing little streamers, if I was to get involved with electric combat. These planes aren't very cheap either, when you consider what you are getting, so I would build copies out of kite shop material, carbon tubing and rip stop fabric for the wing. TYVEK building paper works for wing cloth too.