CO2 Crumple Zone Eggmobile

by Shacksandbeans, published

CO2 Crumple Zone Eggmobile by Shacksandbeans Dec 7, 2016
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428Views 109Downloads Found in Physics & Astronomy


This CO2-powered crash test car lets you design and iterate crumple zone bumpers in order to protect a passenger egg from injury. Use a CO2 car launcher from someone like Pitsco or Kelvin, wheels from a Lego Technic motorcycle (I got mine on eBay), and create a flat wall for the car to crash into (I put a board against paint cans). The car is guided by monofilament, and I put the wood wall at 50' from the launcher. At that distance, a 12 gram CO2 cartridge will shoot the car fast enough to break an egg without a well-designed crumple zone. Use a slo-motion camera app to capture and analyze the destruction. See "CO2-Powered Eggmobile" on YouTube for my 2 min. video. https://www.youtube.com/watch?v=liyXWWYGgdg My students copied and tinkered "Bumper Posts" in Tinkercad. This way, the connection to the car is consistent and correct, but the crumple zone element is their own invention.

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Ultimaker 2








The axles need rafts, but not the other components. I use an exacto blade make the axle shafts round where they will contact the car body, and I shave down the ends so they fit into the Technic wheels properly. Also, the axle rings are important in order to reduce friction between the wheels and car body. They also help reduce play between the wheels and body.

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What an awesome class project! Thank you for sharing the idea and examples. Great video too

Thanks! A lot went into it, so I appreciate your feedback. My fifth graders are enjoying the crumple zone challenge.