Go do a bit of research at the RCCA web site for events close to you, I believe there is one in MN this weekend, it would be worth the effort to drive there and see it first hand! Guys there would be more than happy to answer questions and show you the equipment.

Short version, its all about chasing streamers, 30' of streamer on the tail of the plane and you try to remove the competitions without hitting them preferably. Its a lot of fun.