Wonder if any of you experts can help.

I've been "volunteered" by my club to set up some combat days early in the New Year. This is a new idea for our club, and we don't have anyone with any real experience of combat. We've had a few trial flights using SPAD models, 3 or 4 of us have built different designs and had some "dogfights" using crepe paper streamers, (damn hard to cut the streamers isn't it) but now we're going to do this as an organised event we're wondering if we need to set up some proper rules.

Our thinking is max engine size of 30 and then free design as to what to build and fly. Can anyone offer any advice or pointers?

Or any of you experts fancy a trip over here to the UK to show us how it's done? And no, we're not paying your expenses