Instructables: exploring - play - trebuchet - mini - featured http://www.instructables.com Fri, 18 Apr 2014 15:04:11 PDT BLOX v1.01 Mini Siege Engines http://www.instructables.com/id/Mini-Siege-Engines/
Mini Siege Engines - More DIY How To Projects]]> http://cdn.instructables.com/FZC/PA0N/H19RT1K9/FZCPA0NH19RT1K9.SQUARE2.jpg http://cdn.instructables.com/FZC/PA0N/H19RT1K9/FZCPA0NH19RT1K9.SQUARE.jpg http://cdn.instructables.com/FZC/PA0N/H19RT1K9/FZCPA0NH19RT1K9.SMALL.jpg WYE_Lance Ah catapults - a classic and exciting engineering project that introduces students to some fundamental ideas in physics and engineering. Stored energy, trajectory, the value of density in projectiles, and of course firing stuff across the room! Lesson Plan: Grade range: 3-5 Prep: 1/5 Setup: 2/...
By: WYE_Lance

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Mon, 30 Apr 2012 11:54:36 PDT
Launch It: Torsion Spring Catapult http://www.instructables.com/id/Launch-It%3a-Torsion-Spring-Catapult/
Launch It: Torsion Spring Catapult - More DIY How To Projects]]> http://cdn.instructables.com/FU4/PURA/F54HJ9RD/FU4PURAF54HJ9RD.SQUARE2.jpg http://cdn.instructables.com/FU4/PURA/F54HJ9RD/FU4PURAF54HJ9RD.SQUARE.jpg http://cdn.instructables.com/FU4/PURA/F54HJ9RD/FU4PURAF54HJ9RD.SMALL.jpg i make shooting things True catapult that uses a extremely tightly wound string to power it, it fits in the palm of your hand, it cost under $20. all supplies can be purchased at Michaels. fires small foam objects 40 feet aprox 1053 feet to scale, about 7.5FPS when firing a 14g weight (twice the weight of the catapult its...
By: i make shooting things

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Thu, 16 Aug 2007 10:31:55 PDT