1/2A is the easiest to do and probably most durable form of RC Combat. The trick to flying all day with no mid airs is to build them light, slow and identical. I built a batch of 36x9 balsa flying wings about 5 years ago and have retired very few of them due to crashes. When the hay is chest high, these planes usually don't even reach the ground after a mishap or for refueling. A .061 AP Wasp, 2 oz Hayes tank and a pair of HS-81 servos do the job tank after tank. Prop the planes to suit your tastes, 6x3s will net about 35 mph, 5x3s will get you maybe 45-50 mph.
Streamers are crepe paper rolls that have been band sawn down the middle, 3 or 4 arm lengths with 10-15 foot string leader. There is a flimsy and easy to break yarn that is the best for leaders.
This is the type of combat that is best flown real close in, the planes weigh 13-14 OZs RTF and have pretty good vertical. This is real dog fighting instead of high speed jousting.
Some scrap spar material, packing tape and CA glue are nice to bring along, but I have flown several all dayers were we did nothing more than gas them up and tie on fresh streamers.
Have fun.