National Geographic Da Vinci's Battalion 3-Model STEM Kit

Build three working wooden models inspired by historical siege machinery: a ballista, bombard, and catapult. Assemble the mechanisms, then use the included targets and projectiles to investigate construction, force, and trajectory.

Educational specifications

• Subjects: Engineering, physics, and historical technology
• Format: Three-model wooden building kit with instructions
• Includes: Laser-cut wooden components, rubber bands, sandpaper, 15 projectiles, and six paper targets, according to the imported listing
• Estimated build time: 1–3 hours per model according to the imported listing
• Brand: National Geographic; imported copy identifies Blue Marble as product developer

Follow the included assembly and projectile-use instructions. The kit is a model-building introduction to historical machinery, not a claim that all three models are documented Leonardo da Vinci inventions.