Sounds like fun... One good hit kills the engine, and both the "winner" and "loser" go spiraling to the ground. I know I love chasing down crashed airplanes...

I'm truly afraid of what this kind of activity is going to do to combat in general for AMA members at least. To the casual observer, this is going to look like "smashing up airplanes," a misconception that proponents of R/C combat of all types have been working hard to eliminate.

The AMA almost put a specific rule prohibiting full-contact combat into the Safety Code last year. This would mean no insurance coverage in the event your PBF went haywire and hit someone/something. With the way you're intentionally trying to bash each other out of the sky, and all primary systems out in the open where they can easily be damaged, this is not a terribly remote possibility.