After spending way too much time looking at various water rocket sites on the web, I decided I had to build a water rocket launching system for my Chrysalis radiocontrolled hand launch glider. Thanks to Clifford Heaths Water Rocket Simulation web site I was able to calculate that an open nozzle 2 liter soda bottle would result in 50+ Gs of acceleration with my 10 oz glider strapped on the side. I knew that my poor plane wouldnt be able to handle it, so I decided to go with a reduced nozzle diameter. The most convenient way to do things was with the LEGO garden hose quick disconnect garden hose fittings you can find at your hardware store. Heres a picture of the whole assembly on the launch pad .

Website: http://www.charlesriverrc.org/media/1998/199812_kanskyrocket.html