Build a mini air cannon!
This is one of the 48 projects for our Instructables: Made In Your Mind (IMIYM) exhibition at the Children's Museum of Houston showing from May 26, 2012 - November 4, 2012. Produced in partnership with Instructables, IMIYM is an exhibit where families work together to build different fun, toy-like projects that help construct knowledge and skills related to science, technology, engineering, and mathematics while instilling a “do-it-yourself” attitude in kids so they feel empowered to explore, tinker, and try to make things themselves. To learn more, check out the article here.
For this project, we've taken an Instructable created by someone else and modified it for use in the Museum. This specific project is based on the Paper Cup Air Cannon project by MaddHatter, but there may be others on Instructables that are also similar. Often, we have to change the materials and/or process due to the large number of visitors (we see over 800,000 annually) and the need to ensure safety in a mostly non-facilitated environment. So, yes, many of these projects have room for improvement in both materials and methodology, which is PRECISELY what we want to encourage the kids to do. So please do share your ideas for improvement and modifications!
Using the lowest line on the cup as a guide, cut off and remove the bottom of the cup. Keep the edge as straight as possible.
Using roughly 1” pieces of tape, tape the CD to the bottom of the cup. Make sure to completely seal the cup to the CD.
Cut off the straight part of the balloon. You only need the round part.
Stretch the balloon completely over the top of the cup, keeping it as tight as possible. Pre-stretching the balloon may help get it on more easily.
Optional - Use tape to secure the balloon to the cup. We find that some kids pull a little too hard and pull off their balloons.
Aim the hole at a piece of paper (or other target), pull back on the balloon and let go!
Remember that the cup isn’t empty – it is full of air which is made of matter and therefore can exert a force. We see the force of air whenever wind blows things around. In the case of the Airzooka, when you pull the balloon back and release it, the balloon pushes some of the air inside the cup out through the hole in the other end. There is enough force in that traveling air to move other matter that’s pretty lightweight, like scraps of paper.
Could I make one on a larger scale?
My dad has a rig similar to this (the grabage can one) that he uses to blow out candles. Very nicely done!
Thanks so much! I'll likely be posting my trashcan and 5 gallon bucket versions. I'm sure others may have already posted so I will take a little search before I post anything so I can try to give credit where credit is due.
I tie a knot in the neck of the balloon and cut a small hole in the other end. Put the hole end on the end of the cup, and then you have the knot to hang on to when you pull on the balloon to shoot the cannon. Thanks for the CD improvement. I do this one for the Webelos Cub Scout Scientist Activity Badge. Thank you.
I like that idea of using the other end. We'll give it a try!
Drop a chunk of dry ice in it and some warm water, then shoot it. Epic smoke rings!
Cool (literally and figuratively) idea! Thanks!
We did it in my applied science class, then later on on a huge scale wit ha garbage can.
This is a great, kid-friendly project! Sure, there are other guides for making air cannons, but this one takes into consideration safety AND learning. Awesome work, and now I want to make some for a more monitor-safe version of intra-office warfare.