Dual-Propelled Model Plane Uses Jet and Rubber Band
July 1946 Popular Mechanics

May 1968 Popular Mechanics
May 1968 Popular Mechanics - RF Cafe[Table of Contents]

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Dual-Propelled Model Plane Uses Jet and Rubber Band

Dual propulsion - rubber bands plus jet action supplied by carbon dioxide cartridges-is the latest development in model planes. With the cartridge attached to the plane, a wooden launching gun equipped with a strong rubber band and a needle-pointed plunger sends the miniature aircraft zooming into the air. The rubber band releases the plunger which breaks a small hole in the cartridge to expel the carbon dioxide gas and provide the jet power. Planes with propellers have the added power supplied by "wound-up" props. The person launching a dual-propelled ship winds the prop, positions the plane on the cartridge-holding launching gun and releases the trigger and prop at the same time. Designed by engineers of Aircraft Products Company at West Chester, Pa., the planes are available in various models, including a miniature replica of the Ryan Fireball. Scientific principles of flight, weight and air control were followed. For example, the weight change that occurs due to carbon dioxide discharge does not unbalance the plane since the cartridge is prepositioned to maintain its proper center of gravity. The carbon dioxide cartridge-the same type used in siphon bottles-is powerful enough to give a plane a fast lift but is not dangerous to use, the manufacturer explains, and contains no fire or explosives. Carbon dioxide was decided on after experiments showed powder was difficult to handle and sometimes dangerous.