Water Rockets: Build your own rockets, parachutes and launcher, take aerial photographs with it and try out the Water Rocket Computer Model to download and HTML Help in four different languages to download. A computer model that will predict the height that a water rocket will fly, its time aloft and if there are any peculiarities about the flight (amongst many other things). You can use it to optimise your flight by looking at nozzle diameters, mass of water and so on - includes files to get you started, tips on what to do, 3D graphs with automatic optimisation searching to make it all easier (you still have to build the real thing for youself though :-). Have a look at how the model works. This is a Postcardware program that you can download or you can e-mail me if you want to receive a copy as an attachment. New - updated computer model - now two stage as well. If you have visited this water rocket site before, you can look at the What's New page.