Check out Kiteman's version as well. http://www.instructable,com/id/How-to-Make-a-Desktop-Viking-Catapult-with-a-bonu/
Thanks to everyone who voted for me in the Office Supply Contest!
Here's a video of it firing:
Firing.mov1 MB
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Signing UpStep 1: What You Need:
- 2 pens
- A plastic bottle cap
- At least 14 elastics
- A craft knife or pair of scissors











































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http://www.instructables.com/id/office-supply-catapult/