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.

A standard 250 cubic foot cylinder pressurized to 2,500 PSIG can become a rocket attaining a speed of over 30 miles per hour in a fraction of a second after venting from the broken cylinder connection ...

four valves per cylinder Compression Ratio While its 163 lb-ft gut-wrenching torque is a hook solid enough, the Triumph Rocket 3 221 Special Edition has a few more tricks up its sleeve.

Sometimes after liftoff a SpaceX Falcon 9 rocket displays a “jellyfish” effect in the sky. The jellyfish effect typically happens during late-night or early morning SpaceX rocket launches ...