Depends on how big, and what you are best equipped to work with. Toy (can hold in one hand) popsicle sticks, paper clips, rubber bands, straws, pencils, etc. read more
The most accurate catapult is the trebuchet, which uses a wooden frame, a long beam that acts as a throwing arm, and a counterweight that outweighs the payload. The payload is placed in a pouch on a sling that releases from a ring at the end of the arm. read more
How to Build a Strong Catapult Four Parts: Preparing to Build Forming the Base Forming the Arm Lacing the Arm Community Q&A The strength of a catapult could refer either to the sturdiness of the catapult frame and its ability to withstand use, or it could refer to the force with which the catapult launches projectiles. read more