We are fascinated by the hybrid rocket engine which [Ben Krasnow] built and tested in his shop. It is actually using a hollow cylinder of acrylic as the fuel, with gaseous oxygen as an oxidizer.

Hybrid rocket engines offer perks from both worlds, with simple solid fuel and the ability to throttle down by regulating oxidizer flow ... get to a flight ready engine. His previous experiments ...

Engine design optimization ... and implementation of hybrid rocket propulsion systems. These include addressing low-frequency instability, managing the shift in oxidizer-to-fuel ratio during ...

The panel of inquiry has arrived at the conclusion that the oxidizer tank of the third-stage engine was ripped open ... measures to be taken at space rocket industry enterprises to guarantee ...