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ACADEMY 18137 Da Vinci Series Catapult Mechanical Model Kit Tap - 2-56 Atlas 20001715 HO Scale PairedACADEMY 18137 Da Vinci Series Catapult Mechanical Model Kit In da Vinci's original drawings, this stone throwing siege catapult showed gears, a release mechanism, and a solid wood base. His catapult's force was acquired from the tension stored in two flexible, wood limbs. The designers at Academy followed the basic drawing to capture the workings of a mechanical masterpiece. FEATURES: Easy to build Once assembled, this rubber band powered catapult kit