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Many of the catapults built by Team Tormentum have equivalents that can be purchased as kits from Ron Tom's family of websites, or you can buy the plans.
Plans for a wide range of trebuchets featured at http://www.trebuchet.com.
Plans for a wide range of onagers and ballista featured at http://www.onager.com.
This CD includes a range of manuscripts, some plans and simulators for trebuchets to help you tune your own trebuchet designs.
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