and even hybrid rocket engines are becoming passé. We’ve never seen a liquid-fuel rocket build before, so that’s what this roundup evolved into. First up is [Robert Watzlavick], who has been ...

Last April, we caught wind of a very impressive rocket engine ... the engine using alcohol fuel and LOX pressurized by Helium, but that plan was changed to use Nitrogen as the pressurant.

The A-5 ran on a mixture of gasoline and liquid oxygen, with nitrogen pressurizing the fuel. The key innovation in the A-5 was its gyroscopic stabilization. Gyroscopes mounted near the rocket's ...

For nearly a year, SpaceX has been trying out something new: super-cooling the liquid oxygen (LOX) which is a key ingredient in rocket fuel. It's called deep-cryo LOX, and the idea has been around ...