CO₂ dragster

CO₂ dragsters are cars used as miniature racing cars which are propelled by a carbon dioxide cartridge, pierced to start the release of the gas, and which race on a typically 60 feet (18 metres) track. They are frequently used to demonstrate mechanical principles such as mass, force, acceleration, and aerodynamics. Two hooks (eyelets or screw eyes) linked to a string (usually monofilament fishing line) on the bottom of the car prevent the vehicle from losing control during launch. In a race, a laser scanner records the speed of the car at the end of its run. Often, the dragster is carved out of balsa wood because of its light weight and cheapness.[1][2]

Rear view of a "rail"-style dragster, with external wheels. The hollow container for the carbon dioxide cartridge can be seen towards the rear of the car.

CO₂ cars are a part of engineering curricula in parts of the world such as Australia, New Zealand[1] and the United States.[2] In the United States, classroom projects and competitions can operate under the aegis of the Technology Student Association at middle school and high school levels.[3][4] Competitions are sometimes featured in local newspapers.[5] Students learn about the forces of gravity, drag, wind resistance, and the motion of air as a fluid. The projects mainly test the aerodynamic, mass and friction properties of a car. These forces can influence performance in a race, so it is vital to take them into account when building.

An unfinished "shell" dragster, with wheels enclosed within its body