Not only 4 on one but flying three AAs tied together (there is a pic of it somewhere) - you take the lower wings off the three planes. Use one plane in the center and glue the top wing of it into the lower wing slots of the other two (one on each side obviously). Doesn't tend to fly so good without more fussing balence and such. BUt is sad to sound like a swarm of bees. I wonder about leaving the lower wing on the outside of the two outside planes?

Goto the forum wattflyer.com and to "Indoor and Micro Electirc planes" and to "Aero Ace Mods" page 2 post#39