Fun bats are popular here for combat,
but you could make a decent boom type fun fly out of it by adding rudder, and bigger ailerons. You will probably want more than the 0.15 engine they use for combat. So long as you don't load it up with heavy servos and battery, a hot 36 or a light 40 and suitable prop might do the trick.

checkout the Stickit www.airflair.com it is well spoken of and would be a good guidepost to head tward.