For a few years now I have been building water rockets out of soft-drink bottles. For their simplicity these perform remarkably well. These pages detail my rocket setup.
There is also a lot of other information on the internet - just do a search for 'water rockets'.
Here are a couple of my favorite sites:
http://ourworld.compuserve.com/homepages/pagrosse/h2oRocketindex.htm
http://www.aircommandrockets.com
Launchers
Version 2 - 'Launcher in-a-box'
Version 3 - 'Quick-Fill Launcher'
For more of my projects, go to clayton.isnotcrazy.com
