This is a great project to make for the kids. It shoots paper rockets with ease and does not require any compressed air. It is powered by hitting a 2-liter bottle with your hand. So easy a child could do it, and that is why you should make one for your kids.
Just remember that PVC is only a form of hard plastic. It can and will break if too much weight or force is applied and injuries can occur. Please use caution when using anything made from pvc.
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If you would like to make even smaller paper rockets that shoot using a straw, then follow this link: www.youtube.com/watch