How to Make a Lego Catapult with Bricks You Already Have
This LEGO catapult design uses common LEGO pieces that you have already or could substitute a similar block. Kids of all ages can use the simple LEGO catapult idea and make working catapults at home or in the classroom. This simple STEM project is playful learning at its best!
Homemade Catapult DEsign
Last week my family visited a Genghis Khan Exhibit and saw a real life size trebuchet that they could put their hands on (and shoot some ping pong balls across the museum). At home, they have been all about creating catapults out of everything.
Related: 15 more ideas how to make a catapult
This LEGO catapult design was created by my 10 year old using just the bricks we already have.
The boys own one of the Lego Castle sets that includes a catapult. Many of the pieces used were from that set. He has modified that a little to increase projectile distance.
As with all things Lego, modify these instructions to use pieces that you might have at home!
How to Make a Lego Catapult
Construct the base. The base platform and the catapult foundation consist of these pieces:
Add Lego blocks that allow for arm movement.
The base built from pieces pictured above are on the left. The pieces used for the arm movement base are pictured on the right:
The base is now complete.
You can see that the two small 2 x 1 stud bricks in between the gold caps are on a rod and can be rotated 360 degrees at this point. This is where the moving arm will attach:
Build the catapult’s moving arm with the pieces shown here or similar:
Finish the arm and attach it to the 2 x 1 bricks mentioned above:
Attach a rubber band.
Launch projectiles across the living room.
Catapult vs. Trebuchet
The exhibit was calling this type of catapult a trebuchet.
We were wondering what the difference between the two weapons were and after a little internet search which included Wikipedia, this is what I understand to be true:
- Catapult: A catapult is a mechanical device used to hurl objects. It is a general term and there are many types of catapults.
- Trebuchet: A trebuchet is a type of catapult. The early models were called traction trebuchets and used manpower and ropes to launch a projectile. Later models used pulleys and counterweights and improved the accuracy of aim significantly.
The type of catapult we just built out of Legos could be described as a traction trebuchet if you imagined the rubber band to be men pulling on ropes.
Looking for more trebuchet and catapult building ideas?
MORE CATAPULT MAKING FUN For Kids of All Ages
- How to make a catapult out of popsicle sticks
- Simple DIY catapult design
- Larger launching catapult design using wooden spoon
- Make a Tinker Toy catapult
More LEGO Fun from Kids Activities Blog
- Our favorite LEGO ideas for kids…and beyond!
- Best LEGO storage ideas for organizing and storing the little bricks.
- Become a LEGO master builder. It is a real job!
- How to build a Lego table…I ended up building three of these and they lasted for YEARS of LEGO building fun.
- What to do with used legos.
- Make your own LEGO travel case for fun…
- Where are legos made?
- If you liked making a lego trebuchet, then check out how to make a scale out of lego bricks!
- Here are 5 fun ideas to do your own lego challenges for kids.
How did your lego catapult turn out? How far can you launch projectiles across the room?
This is so cool! Way to go, Ryan.
He did a wonderful job.
Very cool! My kids would probably use it to throw things at each other. lol
ryan ……….. nice intelligent, hopefully Ryan can make more than the past …. ok
What a great idea and thank you for making it so simple to follow the directions. I’m going to show this to my son later tonight and see what kind of embellishments he adds to the catapult. I know I’ll be finding more little Lego pieces in the carpet after the catapult session.
Chief Fun Officer
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This is made of awesome. My daughter is going to go nuts for it when I show her tomorrow. Way to go Ryan!
My kids will love this! They are Lego maniacs! Can’t wait to show them. Thanks for sharing.
How fun! We made a catapult with boxes earlier this year, and lego one would be a great follow-up. I am excited to show my kids.
Oh that’ is awesome! I hope we have all the parts to make this, I know my son is totally going to want to do this!
My boys will LOVE this. I’m not sure if I should show them or not, I’m having visions of lego fights and legos flying all over the house. 🙂 Great idea, Ryan!
Oh so cool… and we have all the bits to make this!
What a great idea. My children love building out of lego, I’m sure they’ll want to give this a go.
This is awesome! My son just made a catapult at scouts day camp, but I think he would love to have this one too!
ha! this is so cute! Found you on TT&J.
I would love for you to link this up at my weekend Link Party, Once Upon a Weekend. This weekend is my first-ever party, and I am so hoping people will participate! 🙂
Here's the link if you're interested:
Also, if you have a list of favorite link parties, I ™d love to be included on Fridays. Thanks a ton!