We need a little more info to help you out. I am not familiar with airsoft other than it is similar to paint ball and is kind of like capture the flag.

What do you want this UAV to do, Drop Something on your enemy, Aerial Surveilance, what???? That will help us narrow down what you need.

You say you fly Helis, why not use one of those for a UAV.

Have you ever flown a fixed wing RC aircraft? As you can guess it is very different from helis.