Incredible High Pressure Water Rockets Reach Altitudes of 800 Feet
http://youtu.be/5V5FteVmdvc
Air Command Water Rockets is a group of hobbyist rocketeers, led by Australian George Katz, who build incredibly sophisticated high pressure water rockets constructed mainly from plastic soda bottles. Their most elaborate rockets have reached altitudes of more than 800 feet (video) and feature multiple stages, cameras, and parachute reentry systems.
via Make
photos via Air Command Water Rockets