make your own catapult Videos
| Description This weekend, get some PVC and build a human powered catapult. Bre Pettis joins forces with Bill Gurstelle, seige weapon builder extraordinaire! Fetchez La Vaca! |
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| Related keywords: | bill gurstelle bre pettis catapult trebuchet waterballoons kingoffling diy howto make makezine instructions electronics gadgets oreilly science technology art |
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