Apparently, the model plane kit shown here, called the Stringless Wonder, can fly up to a mile and remain airborne for 5 minutes. A mile? 5 minutes? On rubber band power? It's hard to believe. I guess I can shell out the $10 and find out!
Available as the Stringless Wonder at Edmund Scientific and PP-4 STRINGLESS WONDER KITE at Amazon.com. For the lowest price ($7.95) check out the Stringless Wonder at SK Science Kits.