The rocket is part filled with water, and air is pumped in with a foot pump. When the rocket is released from the launcher, the high pressure inside the bottle equalizes with the air outside ...

The basic idea is to use several chambers on the water rocket, one which provides an initial short “boost” phase of high acceleration, followed by a longer “sustain” level of acceleration ...

When NASA sends up a rocket, one of the most dramatic visual aspects is the enormous quantity of water sprayed on the launchpad. This sight is not aesthetic; it's an important tool to guarantee safety ...

But now a teacher has gone and ruined all that by making an air-water rocket launching pad for his STEM students. Just kidding — [Robert Hart] must be the coolest teacher in Australia when ...