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.

For the first N-1 launch, the rocket was powered by 30 of these closed-cycle engines, each running at about ... Thanks for the tip, [M]! Retrotechtacular is a column featuring hacks, technology ...