SAFETY: This rocket uses air pressure to fling a bottle ... Keep pumping until the cork pops and the bottle flies away. Here's a simpler design using a pump that has a needle for inflating things ...

The bottle rocket challenge: faces from across the BBC ... The pressure build up, until the cork pops out. Dr Maggie Aderin-Pocock: When the bottle is the other way around, the downward force ...

It’s an automatic parachute deployment system that you build into the nose-cone of your rocket. The main portion of the build is made out of plastic soda bottles (2 liter size) to end up with a ...