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 ...

Instead carefully drive the pump's needle through the cork so you can add air ... Once the bottle is empty of water, its flight starts to slow. If the rocket doesn't fly at all, check two things ...

This water rocket launcher lets you do just that. Built using the frame from an old grill, a soda bottle takes its place on the upturned PVC pipe. There’s a connection for your garden hose ...