How to Make a Far Throwing LEGO Catapult

Written by adelaide tresor
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How to Make a Far Throwing LEGO Catapult
Architects of all ages will enjoy constructing LEGO catapults. (Jupiterimages/Goodshoot/Getty Images)

Building a LEGO catapult is a rewarding experience for all children who love to construct. If the necessary blocks are not already in your possession, they are available at any local store that carries children's toys. Catapults constructed from LEGOs are durable and can launch objects several feet away. LEGO catapults can provide hours of entertainment with friends and family. Catapult architects will enjoy competing against each other to see who can launch objects the greatest distance.

Skill level:
Moderately Easy

Things you need

  • LEGO base
  • LEGO struts with holes
  • LEGO pins
  • LEGO axle
  • LEGO single and two-prong pieces
  • Lead fishing weight
  • Copper wire
  • Scissors
  • T-shirt
  • Needle
  • Thread
  • 3-inch long elastic line
  • Key ring
  • Marshmallows

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  1. 1

    Create a base using three layers of one-prong-wide LEGO strips on a flat 8-inch by 8-inch LEGO base plate. Set the base walls parallel to each other with four rows of prongs between them, each row an equal distance in from the edges of the plate.

  2. 2

    Construct two A-frames using two 2-inch-long single-prong LEGO struts with holes connected with an arm pin at the top and another 2-inch strut at the base to make a triangle. Connect another 2-inch strut at each base corner of the triangle and secure with pins to make the "A" shape. Mount the A-frames to the three-layer walls created in the previous step with pins.

  3. 3

    Attach two single-prong LEGO struts with holes to each end of a two-prong by 16-prong plate to create the catapult arm. Secure with an additional two-prong by 16-prong plate underneath to sandwich the struts.

  4. 4

    Attach a lead fishing weight to one end of the LEGO catapult arm by threading copper wire through the outermost strut holes. On the opposite end of the arm, thread a 3-inch piece of elastic string through the strut holes and tie a key ring to the loose end of the string.

  5. 5

    Cut a small strip of T-shirt, approximately 3 inches long and 1 inch wide. Stitch one end together so the T-shirt becomes a cuplike pouch to hold the projectile. Wrap the sewn end around the key ring and stitch in place.

  6. 6

    Slide the end of the catapult arm closest to the fishing weight onto a LEGO axle through the strut holes closest to the long plate. Insert the axle through the pinnacle of the A-frames to complete assembly of the catapult.

    How to Make a Far Throwing LEGO Catapult
    Launch marshmallows and other soft objects with a LEGO catapult. (Jupiterimages/BananaStock/Getty Images)
  7. 7

    Pull the T-shirt scrap away from the catapult, stretching the elastic line and raising the lead weight. Load the T-shirt with a marshmallow, pull back tightly and release to launch the marshmallow up to 30 feet.

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