Spaceworks
A construction guide for rockets and a launcher, links, and software.
Water Rocket Index
Many tips on safety, building water rockets, fins, recovery systems, aerial photographs, building a launcher, T-shirt design, and a computer model free download.
Water Rockets at the Ghent University
Hydroaeropropulsion Rocket Research Labs AKA The Most Unspeakable Project Of The Department. The water rocket craze hits again ...