motorized catapult 3d model

My proposed design is a motorized, spring-driven catapult featuring an integrated, synchronized autoloading mechanism that mounts non-destructively to the ELEGOO car chassis. The system utilizes a high-torque servo motor to pull back the main catapult arm, stretching a metal tension spring to fulfill the stored mechanical energy requirement. As the motor retracts the arm into its firing position, the arm physically engages a trigger that tilts a parallel autoloading lever of matched length. This synchronized action releases exactly one ping pong ball from a gravity-fed wooden hopper directly into the catapult cup, satisfying the mandatory autoloader function without requiring a secondary motor. Once the vehicle autonomously navigates and stops at the designated drop zone, the servo releases the arm, allowing the spring to snap forward and launch the payload. This automated cycle repeats consecutively to accurately deliver all three emergency supply payloads , ensuring rapid cycle times while keeping the entir