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John Sager Middle School EXPECT MUCH...achieve for a lifetime! 1755 S. College Ave. • College Place, WA 99324 |
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CAD & CO2 Cars

In GEAR UP's Computer Assisted Design program, students begin by learning and practicing with the high end CAD program called ProDESKTOP, since updated to ProEngineer. Once they have a basic mastery of the software, they begin to create possible designs for a CO2 race car. After choosing their best design, it is printed and paired with a racing kit, which includes one wooden car body blank (essentially a small block of wood). The pattern is attached to the wood block, and the CAD instructor cuts it out using a band saw. Then, students spend time with wood files and sandpaper as they shape and perfect their models.
The models are painted, and outfitted with axels, wheels, and other decorations. Then the real fun begins. The race track is constructed, and can vary in length, but includes a starting mechanism and finish line. Between the two is strung two lengths of 50 lb. test monofilament line to which the cars are attached when racing. The race cars are powered by a single 8 gram CO2 cartridge, inserted in the back of the car. When the starting light hits green, students press the start buttons and the CO2 cylinders are punctured, propelling the cars down the track. A connecting laptop computes student reaction time, elapsed race car time, and miles per hour. The fastest car in the 2008 group topped 43 mph.

