10+1 Steps to Building a Trebuchet

Step 1: Cut all of the wood pieces into the correct sizes. 

Step 2: Drill the wood pieces together to form the rectangular base.

Step 3: Drill the holes for the dowel in the side pieces and the lever arm.

Step 4: Drill the side pieces onto the base and then attach the triangles for extra support.

Step 5: Slide the dowel through the side arms and the lever arm.

Step 6: Create a sling attached to the lever arm on one end, with a loop on the other end to connect to the release nail.

Step 7: Attach the weights to the short side of the lever arm, and attach the sling to the other side. Bend the nail to a desired angle and then test its position through trial and error to determine the best angle for your sling's length.

Step 8: Attach a flat board to smooth the sling’s flight.

Step 9: Test your catapult! You may have to make minor adjustments to the angle of the nail, the length of the sling, or the amount of weight attached to the lever arm.

Step 10: Create a trigger mechanism for your trebuchet using a piece of nylon rope, half of a shish kabob skewer (or some other item that can be used as a pin) and eye-hole screws.

You’re DONE! :)

Optional final step: Paint your trebuchet!