Neurotex,
i had coreldraw running just now i so i measured the amount of wing area on the fling plans, and it came out to be around 15sq inches, not counting the upper wing, and thats only the 7" version. how slow do you want the plane to go would be the question, a 10" span version would give almost 30sq in of area, if you keep the AUW to around 15 grams, you'd have a wingloading of around 2.5oz sq/ft, so she could probably move about relatively slow, but still be able to rip. of course, if its heavier, she'll just move a little quicker i'd start somewhere in the 10-12 inch range, if you want it faster, you could just trim some of the trailing edge off!

where are you mounting the motors?

nick