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.

Most any rocket engine you’d find on a spacecraft – save for solid or hybrid rockets – use an engine system that’s fairly complex. Because of the intense heat, the fuel is circulated ...

Read More Amazon CEO Jeff Bezos’ Blue Origin space venture opened the doors of its engine factory in America’s Rocket City today, and promised that next-generation BE-4 engines would be ...