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" The creators of spud guns, trebuchets, gliders and other mechano-toys take pride in their work, and tend to have a sort of open-source mentality. In other words, they&amp;#039;re happy to share their plans, and their home videos. This is spudgun advice by Joel Surprise, who also sells spudguns through the Web, and here&amp;#039;s a rough diagram of a solid, basic model for you to download. (And here&amp;#039;s video of one of his more monstrous creations.) Major caveat: Spud guns are dangerous. Our article contains a number of safety tips; among the most obvious but most critical: Never look down the barrel of a spud gun that is or could be loaded. Treat these items like a firearm. Additionally: Spudguns may be illegal where you live; you should find out before building or shooting one. Trebuchet tips and video are courtesy of Kevin A. Geiselman. Here&amp;#039;s some useful glider information at a site created by Eric Brasseur. Download this pdf to see a useful set of plans, at a site run by the Westchester Radio Aero Modelers. There&amp;#039;s a lot of great information on kite aerial photography, including galleries and details about photo contests. Sam Barros maintains powerlabs.org, which is sort of a living monument to his inspiring, and scary, experiments with all things explosive, fast, overpowered, and rocket powered. This  rocket car is relatively simple and safe, but we stress the word &amp;quot;relatively&amp;quot; since it uses soda bottles in ways the engineers never anticipated. This video shows a relatively low-powered (and not totally reliable) alternative. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/adventure/sports/a849/3886757/>