This is a catapult made by CJ. My thanks go to him for letting me know about it. He used the Wyvern catapult plans that I have and he made some terrific modifications including adding wheels and using paracord for the torsion. He also used a 2/3 for the swing arm which gives is a more oompf!

Here is my tutorial on how to make the Wyvern Torsion Catapult

550lb. Type III Paracord 100' Black

550lb Nylon 100 Foot Black Cord - 100% Heavy Duty Nylon Material. Made By A Certified Us Government Contractor. 550 Pound Tested - 7 Strand Core. Made In USA. 5/32" Diameter.ß Type III Commercial Paracord. 100% Nylon.

Amazon.com Has Catapults

Catapult Kit Lay Siege To The Doghouse! Right after you build your own working medieval catapult. All you'll need is glue, scissors and a steady hand to construct this wooden, Canadian-made siege engine kit. The finished catapult stands 6" tall x 5" wide x 10" long and will toss assorted stuff (meatballs?) 15 feet or further, depending upon the stuff. Comes with detailed instructions.

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