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http://www.zheng3.com/2012/05/15/the-penny-catapult/
Here's a basic torsion catapult. It uses one or more elastic bands to launch a U.S. penny if you print it at 1:1 scale. You probably won't get enough torque to be impressive with fewer than 3 bands.
Penny not included!
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Zheng3 Penny Catapult
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You can distribute, remix, adapt, and build upon the material in any medium or format, as long as attribution is given and your contributions are under the same license.
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Free download - login required
Downloaded: 952 times
Downloaded: 952 times
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