WeDo Catapult Build Instructions You don’t have to use this build. You can create and build your own design or use this one.

Catapult on Baseplate with Purple Pompom to Launch

Another view of “loaded” catapult

Side view

Different angle on catapult

All the pieces you need for the catapult

Attach the two small red and gray cross axle brick to the 5-hole beam

Attach the flat white pieces to the sides of the shorter red beams so they look like the next slide

Snap the shorter red beams onto the sides of the long red beam Snap the shorter red beams onto the sides of the long red beam. See next slide for how it looks when done.

Press the small red pieces on the long center beam. The slanted ends of the pieces point away from the center of the beam and toward the ends of the beam.

Insert the axle.

Attach the axle unit to the arm of the catapult. The next slide shows how it looks.

Wrap the yellow pulley around the red beams twice to give a bit of extra support to your catapult arm

Add a little gray bushing on either side of the axle for support/stability during catapult swimg

Add a couple of LEGO bricks on either side of the base to raise the baseplate. You’ll add two pieces of gaffer’s tape on the bottom of those bricks to secure the catapult baseplate to the table when you’re running the catapult.

Pieces for “legs” on baseplate.

Pieces assembled.

Motor mount – two yellow blocks in the middle of the base plate and along the right edge. See next 2 slides.

Completed base and motor mount.

Attach catapult arm by inserting axle in motor

Add pompom and Scratch programming and launch!

Scratch programming Code for the PomPom Ball

Code for the Catapult

Stage/Background code for music

Have fun! Make changes! I know you can make a better catapult build than mine! Please email me your designs and I can add them to this website with your first name. jo.vanvliet@gmail.com