RUBBER BAND POWERED WITH TWIN PROPELLERS. Wing span 19"(490mm), length 20"(500mm), and height 6". This large-scale plane assembles in about 40 minutes and then the fun really begins. A unique ball bearing propulsion mechanism is powered by heavy-duty rubber bands wound by a special electric winder. Flights can reach the same distance as the original- about 120 feet(36M). 4 AA batteries required for Electric Winder.