Engineered with an open counterweight cabinet, the Stirling trebuchet allows you to vary the weight for range and trajectory adjustment. Fire with an empty counterweight for indoor use, or add weight (nuts, bolts, scrap lead, iron or steel, sand, or small rocks) for increased range.

Uses common, inexpensive and easy to find building materials, available at your local hardware store or home center. Basic woodworking skills and tools are required, but the straight forward design requires no complicated layout or joinery. Perfect for demonstrating medieval warfare and technology and the physics of leverage and projectile motion.

This siege engine plans package includes a complete shopping list of materials,  measured drawings of all parts, step-by-step assembly drawings and instructions, as well as firing and tuning instructions.