Flying a thrust-vectoring rocket can be a challenge, and even more so if you stack multiple stages and a minimalist flight computer on top of it all. But [Joe Barnard] is not one to shy away from ...

A diagram of ... with no benefits to thrust or efficiency. Unlike the experiment by the University of Central Florida, the Japanese effort involved launching an actual rocket.

This "propellant rod" is forced into the rocket engine where the two components are separated, vaporised, mixed and burned to create thrust. The engineers behind the new rocket say it would be ...