Building this launcher is simple if you already have a mill. It does a remarkable job of pressurizing and launching soda bottles which are partially filled with water. The main component of this ...

Make a launchpad that holds the bottle with the neck downwards, lets you attach the pump and stand behind the bottle. One good method is to plant a spade or garden fork in the ground at a low angle ...

Making a hole through the cork using a drill ... Oh, and an apple may have fallen on his head. The water bottle rocket demonstrates two of his laws. Every action has an equal and opposite reaction.