Hybrid rockets, which date back to the 1930s, fall in between these two systems. They are inherently safe, use nontoxic, inexpensive fuels, and can be turned on and off. But scientists have been ...

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 rockets avoid some of the disadvantages of solid rockets like the dangers of propellant handling, while also avoiding some disadvantages of liquid rockets like their mechanical complexity.

For comparison, SpaceX's Falcon 9 rocket used over 900,000 ... been a growing interest in hybrid rocket propulsion, which ...

Strapped to a trailer and pulled by a pick-up truck along a runway once used by B-52 bombers ... first commercial launch of a rocket powered by bio-derived fuel. Sascha Deri, who invented the ...