Interesting White Paper to Read!
I recently wrote a White Paper (a nontechnical one) called "HIWR.PDF" which you can get here: High Impact Water Rocketry
which talks about a new way to shoot water or compressed air rockets loaded with commercial payloads. There is an instructable on this, search around and you will find it, but the white paper, tho it has no images, is still more comprehensive and more detailed. You certainly will like it.
Oh, and, if you do like it, please donate $5 USD to [mailto://email@example.com Nathan Zhang via Paypal] so I can continue my research and write more articles. Thanks!