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. The ...

Start pumping gently and steadily, keeping the bottle lined up as best you can ... that if you change the design, you also need to consider extra safety precautions. Rockets work by ejecting ...