We made these nifty little rockets at the Library today. They were so much fun!
The best directions I have found are at the Exploratorium Website.
http://www.exploratorium.edu/math_explorer/tfl_BBO_leaderGuide.html
The only thing we did differently was that we added a couple of pieces of wire hanger on the end of the pvc pipe so it would stick down into the ground.
My girls are a little young to understand the science of the project, but with older kids you could really explore aerodynamics, as well as displacement of air, and the math of figuring out how high they went.
Hope you have fun!
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