Building this launcher is simple if you already have a mill ... The problem with a lot of these water bottle rocket projects is that they leak where the bottle meets the launcher.

Practise and challenge your friends! Download the Water bottle Rockets PDF(378 Kb). Adobe Acrobat is required. SAFETY: This rocket uses air pressure to fling a bottle at high speed 20–50 metres.

Easy to assemble metal water rocket launcher with a 125 PSI safety valve. Rocket will NOT fly straight without an aerodynamic nose cone made from a second soda bottle and use only 1 cup (200 ml ...

This piece of engineering is so simple and elegant, you’ll want to build a pretty serious water ... of your rocket. The main portion of the build is made out of plastic soda bottles (2 liter ...