Balloon Cars for Modular Engineering in STEM
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Modular balloon cars move with thrust from an inflated balloon or from another wind source.
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- Printables
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- Physics & Astronomy
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- Creative Commons — Attribution — Noncommercial — Share Alike
This is a 3D printed balloon car I made with some of my (now) colleagues for teaching physics content (balanced/unbalanced forces) to elementary-aged children. This same car could easily be adapted for physics instruction at higher levels.
The cars are fully 3D printed save the balloon, the bamboo skewer axles, and the axle bushing straw, which was donated by Taco Bell.
My colleagues and I wrote a paper on this car, for which the target audience was elementary teachers. You can access the paper here: https://scholarworks.iu.edu/journals/index.php/thst/article/view/38832
The idea of the paper is that students (grades 1-3) were able to use these to test balanced and unbalanced forces with balloon propulsion, changing nose geometry, and principles of wind resistance. This was part of a semi-constrained modular engineering unit and took place under intense time constraints.
Some other notes that are note included in the paper.
The wheels on this page are sized to fit the bamboo skewers I picked up in the grocery store, which can be inconsistently sized. You may need to scale the wheels in your slicer and guess/check until you have the right size.
The wheels are designed as a replacement for Pitsco wheels, which make a lot more sense to buy if you are using more than a few of them. Those wheels work on a 1/8 inch axle, usually made from aluminum rod. This model is sized for the 1/8 inch Pitsco axles, again, only worth 3D printing in small quantities: https://www.printables.com/model/212307-paper-and-co2-dragster-wheels
The paper describes wrapping the pin on the car with some vinyl electrical tape to get a good fit with the nose cones. I think I have this updated model worked out so that a compression fit should work reliably without the tape.
This page includes four "Flow Constraint" parts, which drop into the chimney. The idea with these was to let students experiment with constraining the rate at which the air is allowed to exit the balloon. I have never tested this feature in a classroom setting.