Lego Fun Friday: Balloon Powered Car Building Challenge

It’s time for Lego Fun Friday!  Lego Fun Friday is a twice-a-month feature on Frugal Fun for Boys.  Each time, I share a Lego building challenge for kids and give you the opportunity to link up your Lego posts.  If you don’t have a blog (or don’t blog about Legos) and your kids want to share photos of their Lego challenge creations, you can share photos on the Frugal Fun for Boys Facebook page.

The challenge for this week was to build a balloon powered Lego car.  Thank you to The Crafty Mummy for the inspiration for this building challenge!

Lego Fun Friday:  Balloon Powered Car Challenge

We did our challenge this week as a playdate with friends, and it worked very well.  We invited another family of four boys to join us, so that made EIGHT boys at our house!  (It was really not that loud, in case you’re wondering!  Just a lot of burping :-) )

Before our friends came, we separated out our wheels and flat pieces so that it would be easy to find parts without everyone having to dig through the same tub.

This was the basic design that the boys used:

Lego Fun Friday:  Balloon Powered Car ChallengeWe had a little trouble with the cars getting rolling on our bumpy tile, so we put down a Thomas the train playboard to start them on.  Then most cars rolled off the board and onto the floor!

It was hilarious watching them blow up the balloon attached to the car!

Lego Fun Friday:  Balloon Powered Car ChallengeAnd racing the cars was fun!

Lego Fun Friday:  Balloon Powered Car ChallengeWe had boys age 4 years old through 11 years old at our house, and everyone had fun building cars.  Our four year old friend was very focused on getting his car just right!

Lego Fun Friday:  Balloon Powered Car Challenge

What we learned:

The farthest distance traveled by a balloon powered car was 12 feet 3 inches!

The boys discovered that the design of the car needed to hold the balloon up high enough that it did not touch the wheels.  Otherwise, the balloon rubbing against the wheels created too much friction.

The best designs had a good balance of stability and light weight, as the heavier cars had a harder time getting started.

Some of the cars did hilarious tricks – like driving on the back two wheels or going in a circle.  By the end, the boys said their cheeks hurt – from so much laughing and so much blowing up balloons!

Now it’s your turn!

Link up your Lego post, or share your kid’s Lego photos on the Frugal Fun for Boys Facebook page.

But first, the next Lego Fun Friday will be April 26th, and the challenge will be to build a sea creature.  Since we’ve done a few “engineering” type challenges lately, my imaginative child requested a chance to build animals.  So sea creatures it is!


  1. Karyn says

    Man! You have so many good ideas on your site. I love every post I look at.i need to remember to stop by more often! I have a linky party going on & would love for you to stop by & share some of your ideas if you have the chance. Thanks :)

  2. Josephine says

    I had found the idea randomly on Pinterest and my kindergarten son chose this as his project for the “Learrning Fair”! My husband, son and I spent hours Friday night experimenting, building, & documenting our observations. We ended our crazy Friday night with 5 cars, and now my son wants to experiment with various balloon sizes/shapes! I think we have “learned” a ton, so mission accomplished 😉 thanks for sharing your results!!!

    • SarahDees says

      That’s awesome! I’m so glad he had fun and learned so much! Experimenting with different balloons is a great idea.

    • SarahDees says

      Gail, We have several sets. We bought a couple of basic bricks sets, but where the boys got a bunch of their wheels was from a “brick wall” at a Lego store in our area. They paid a set price for a tub of bricks from the brick wall, and Aidan loaded up on wheels!

  3. Renee says

    Thank you for the idea! My son just had a Lego themed party and the kids all made Lego balloon cars. It kept them busy for about an hour! Actually more since they went back to designing and testing cars after we had cake! Age range of kids was 4 to 17! All of them had fun!


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