ORIGINAL: wings
Can free flight planes do loops? hmm not the last time I checked, lol.
Got to Wal-Mart... get one of the 4.5 ft foam hand toss gliders. Set the elevatro as shown in the instructions for loops. One proper toss... it'll do up to 4 loops. ($5... put a radio in it later.. they are fun for a demo-derby slope combat.

Lots of pieces of foam when you get done

bring the packing tape.)