This water rocket launcher lets you ... a compressor and some empty 2-liter bottles you might also pick up some extra PVC to make this pressurized water cannon.

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 is a stable chemical ... of the blast to be more effectively transferred to the rocket body. With this in place, the cannon is capable of firing small paper rockets in excess of 20 feet.

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.