How to build a Trebuchet (Catapult) - Wilderness Arena Survival
Floating Arm Trebuchet : 7 Steps (with Pictures) - Instructables
Lisa Riley on Twitter: "My 6 yo #maker made this Da Vinci catapult this weekend. #girlswithtoys #STEAM #STEM @smrtgrls http://t.co/SQh7LexcYf" / Twitter
Review: Tabletop Trebuchet kit
Patent Pending Blog - Patents and the History of Technology: The Medieval Trebuchet