Download the Water bottle Rockets ... And most bottles aren't a great shape for smooth flight. There are many other, more advanced, rocket designs. Some people compete in national competitions.

The problem with a lot of these water bottle rocket projects is that they leak where the bottle meets the launcher. In most cases this is a good thing as it’s almost impossible to build up ...

Download the Water bottle Rockets ... And most bottles aren't a great shape for smooth flight. There are many other, more advanced, rocket designs. Some people compete in national competitions.