I made a PVC pneumatic rocket launcher about 10 years ago for my son. You make rockets out of construction paper and masking tape.
A bicycle pump is used to put compressed air into the chamber. We usually use between 40 and 75 psi.
see http://makezine.com/15/airrocket/
Make Magazine's rocket uses a template.
We just wrap a piece of construction paper around a one inch PVC pipe, seal the seam with masking tape, pinch the top shut and tape it with masking tape and folded tape for fins.
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