CO2 Crumple Zone Eggmobile

thingiverse

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. My students copied "Bumper Posts" in Tinkercad, making the connection to the car consistent and correct, but adding their own unique crumple zone element. Kelvin launcher: http://kelvin.com/kelvina-hotshot-raceway-a-co2-dragster-launcher-1-lane/ Pitsco launcher: https://www.pitsco.com/EZ-Start-Gate Print Settings Printer Brand: Ultimaker Printer: Ultimaker 2 Rafts: Yes Supports: No Infill: 20% Notes: The axles need brim, but not the other components. I use an exacto blade to make axle shafts round where they contact the car body and shave down ends so they fit properly into Technic wheels. Axle rings are essential in reducing friction between wheels and car body, also helping reduce play between them.