J2 Rocket Engine

This is a 1/10 scale model of the J2 rocket engine by Rocketdyne that powered Stage 2 and 3 of the Saturn V rocket. While the F1 engine was the workhorse of the missions and provided an unprecedented 1.5 million pounds of thrust each (7.5 million pounds of thrust total!), the J2 was amazing in its own right and had the unique responsibility of needing to restart in a vacuum, thereby getting the vehicle into lunar orbit, and ultimately returning it to Earth.

Background
I became interested in this project because my father Roger was a test manager for the J2 in SACTO and at the AEDC test facility in Tullahoma, Tennessee in the 60s. We have had an ongoing love of the project, but recently I became aware of Paul Fischer’s incredible scale model of the [Saturn V Rocket and Gantry](https://www.thingiverse.com/thing:911891). Thus, my dad and I embarked on a 5 month build. Around the time that we were building the small version of the J2 engine, he mentioned that he would love to have a la