balloon powered boat

STEM Experiment for Kids: Build a Balloon Powered Boat

Here’s another fun summer STEM project that gets kids excited to go outside. But first, start inside with that big pile of LEGOs you’re always stepping over! Today we’re showing you how to build a balloon powered boat from LEGOs. There’s no right or wrong way to build this boat so try different designs and experiment with which boat travels on the water-powered by its balloon.




lego needed for self propelled boat

How to Make a Balloon Powered Boat

  1. Begin by building what will be the base of the boat. The base works well if it’s a flat thin LEGO, but experiment with different bases because there’s no one way to do this project!
  2. Next, build upon your boat. Should the boat have sides to keep the water out? If it has a low front will the water flow right over the boat causing it to sink when you release the air from the balloon?
  3. Lastly, add the balloon to the back of the boat. You can do this by securing it between a gap in the LEGOs. If the balloon falls off the boat when you release the air try securing part of the balloon with a clothespin or clip.

children making a balloon powered boat

balloon powered boat next step

lego boat

Did your balloon travel on water? Try experimenting with the amount of air you put in the balloon, and the size and shapes of your balloon boats.

self propelled balloon boat

self propelled boat on the water

So if you liked this balloon powered boat, you’ll like these others too:


Robot Chimes

You can also find projects like this on our Instagram page!


Join Green Kid Crafts today!

Like to build? Try our Robot Discovery Box! Our Robot Workshop Discovery Box contains FIVE award-winning Creativity and STEM Science Kits! Your pint-sized robotic engineers will design and create their own Artbot to make artistic swirls, make a Magnetbot and “teach” it to go through a maze, construct a Glidebot and watch it fly, and create habitats for their own Hexbug Nano pet! This Discovery Box celebrates thinking, questioning and original creation with fun and creative projects that will have everyone tinkering and playing long afterwards.

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