Working Catapult or Onager

This is a small but fully functional catapult that works the same way real historical catapults did — by twisting rope or string, not by using springs or rubber bands. When you pull the arm back, the rope twists and stores energy. Let it go, and that stored energy snaps the arm forward and launches the projectile. It’s simple, clever, and very satisfying to watch. You can actually see the physics happening, which makes it a great hands-on way to understand how ancient siege engines worked. It’s designed to be fun first, but it also quietly teaches a lot: how torsion works, how energy is stored and released, and why this design was used for centuries. Whether you’re testing different strings, adjusting the twist, or just seeing how far you can launch, experimenting is part of the fun. This model is perfect as a desk toy, an educational project, or a build-and-play model for anyone who enjoys history, mechanics, or just launching tiny things across the room. It’s not just a model to look