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.

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 ...

To get the rocket to work properly, we have to get the right amount of water in the bottle. Not as easy as it sounds. Try experimenting yourself with different volumes of water. Attach one end of ...