As a kid, I did most of my science fair projects on model related stuff. You might as well have fun in school- right?

I like sloan's idea.

To piggyback off Paul's idea, you could do a project on the effect of CG on your plane. By attaching weights to the fuse, you could measure something about the flight characteristics..... such as wobble(stability) in a harrier (nasa is studying High Alpha flight too), ability to hover hands off...., stall speed....(might need a cop with a radar gun to help with that), etc.

When you get done, post your results! (whatever project you do).