I went through this a while back. I didn't save the links because they are so easy to find.

Go to www.google.com and enter in.... "flying wing" model.... (without the periods) and you'll come up with lots of stuff.

Things to look for, Martin Hepperle's site has some good stuff on designing flying wings. And watch for, or do a search for, Panknin twist spreadsheet. This is an EXCELL file that you can download that calculates the twist required for a swept flying wing. It can also be tricked to provide the balance point for a plank type flying wing that uses a positive pitching moment airfoil.

Topica groups also has a discussion group for wings. It runs hot and cold but I drop by now and then to see a few new posts.

Oops, I seem to have lost the link during my last computer upgrade. Try www.topica.com and search for rcwings.

Good luck.