The catapult is a great robot that uses many gears and has lots of power. The program is as follows:
Step 1: motor A (arm) on.
Step 2: When arm touches touch sensor 1, motor C (loader) on.
Step 3: When loader touches touch sensor 3, motor c rev. direction, on for 1.5 seconds.
Step 4: Motor A (arm) on.
Step 5: Keep on repeating steps 1-4.