Science Project Experiments Catapult Kit - S.P.E.C.K. (tm) The Ultimate Science Project Experimenter's Catapult Kit! It's fully adjustable, multi-configurable and repeatable. Now made from top-quality Engineered solid-oak plywood.
   $59.00  more info

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The Science Project Experiments Catapult Kit The Ultimate Science Project Experimenter's Catapult Kit! It's fully adjustable, multi-configurable and repeatable. Now made from top-quality Engineered hardwood plywood.
   $59.00  more info

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TK3 Model Trebuchet, Hobbyist Version The TK3 Trebuchet Model Kit is an ideal science project machine! Use the hanging counterweight bucket for variable weights, or convert it to a fixed counterweight machine, wheels, or no wheels. The choice is yours!
   $69.00  more info