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 ...

Eco-friendly alternatives to fossil fuels are venturing beyond Earth—and into space.

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.

Water gets pushed down, bottle flies up. Done? Oh no! The first step into more sophistication is the aerodynamics. But honestly, if you make something vaguely rocket-shaped with fins, it’ll ...

We’ve got to say the force with which the jaws close around the bottle flange is a bit scary ... Perhaps it could even launch a two-stage water rocket?

In the video, the friend's air pump fills the bottom of the bottle with air. After the rocket is filled with water, the air pressure increases, causing the rocket to shoot directly into the sky.

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.