Here’s a fun STEM project for kids that is perfect for warm weather – build a LEGO® water wheel and experiment with fluid dynamics.
It was actually not shockingly hot over the July 4th weekend (we live in Texas), and we enjoyed playing outside with LEGO®!
First, Aidan used duct tape to secure some base plates to our oil change tray. We bought this a few years ago in the automotive section at Walmart – it’s quite useful for playing with magnets among other things.
Then we started building!
We used a propeller brick to build a water wheel. We originally had the water wheel on the top of a tower of bricks, and it turned quite well when we poured water over it. But it was much more impressive with the hose aimed directly on it!
The water wheel will only turn in one direction, and it’s fun to have kids work out how to build it and which way the water should flow.
Want to see it in action?
Then we created a door that can open or close to either hold back water or let it flow. (The door stays open from the force of the water unless you physically close it.)
The door pivots on two axle bricks.
Aidan built barriers for the water to flow around:
And Owen wanted a pool for his crocodile at the bottom. We leaned the oil change tray on the edge of our patio to give it a little bit of a slope. The only problem was that the boys would lean on the tray which bent it… It did bend back but I wished we had something more solid to use for our work surface. If you have a board or something, use that instead!
LEGO® bricks and water – what a great way to cool off on a summer day!
LEGO® is a trademark of the LEGO® group of companies which does not sponsor. authorize, or endorse this site.
9 Comments
Michelle Jul 7, 2015
How have I never thought to combine Legos and water? That is so inspired! I love the oil change tray too. I also never would have thought of that, but it's such a good idea for so many different activities.
Fiona Dec 31, 2017
How does the water not leak through the Legos?
Legobuilderqaz Nov 6, 2020
The bricks are pushed down really tight.
The Reading Residence Jul 8, 2015
What a brilliant idea! One for the summer holidays, thanks for sharing
Christine Jul 8, 2015
Have you tried floating objects down the maze? Maybe a little boat or ping pong ball. Thanks for sharing this fun idea.
Jenni Jul 9, 2015
Can you post some instructions for the door and the wheel (or is that part of my challenge? ) Brilliant idea! X
Juliet Jul 11, 2015
Give it to your kids! My 7 year old managed to build the wheel and door by just looking at the pics.
Great idea, my kids both had fun with it (5 & 7yo)
Stef Aug 8, 2015
A great project! I should look for an oil change tray as it looks like a good starter for many projects. Thanks for sharing
Erin @Nourishing My Scholar Aug 15, 2015
This is totally awesome!
P.S. Jan 29, 2016
This is amazing. I was looking for a way to make a waterwheel and demonstrate some engineering principles to my two little girls, when I came across this site. We quickly constructed a water wheel using Lego parts scavenged from a 'Girls of Heart Lake City' set. The water-wheel is powered by the kitchen faucet and drives an elevator spool to lift up figurines. Works very nicely. My girls loved it. Thanks for the inspiration.
P.S. I would attach a picture of our project if this blog supported that feature.
Josie Lynn AWESOME Sep 29, 2017
AWESOME project!!! Super fun anytime!?!
cammy Apr 15, 2020
that is cool
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