[1.12.x] Cryogenic Engines: Liquid Hydrogen and Methane Rockets! (Jan 22, 2022)
KSP 1.12.x
Cryogenic Engines [2.0.6] Last Updated January 22, 2022
This modest part pack is designed to provide some new rocket engines that run either Liquid Hydrogen and Oxidizer or Liquid Methane and Oxidizer.
Liquid Hydrogen Engines
There are nine models provided, two in each of the 1.25, 1.875, 2.5 and 3.75m sizes and one in the 0.625,. These engines have better fuel efficiency than the KSP stock engines, up to 460s of Isp, but beware! They're
They need tanks with a higher volume, not mass, around 4x more, and 8x more with you are using only LH2 (for nuclear engines).
Look at this infographic of Saturn V, the first stage make around 50% of the rocket volume, but have around 80% the weight. That's because it uses Kerosene and O2 (what the Liquid Fuel and Oxidizer in KSP best represents), and the upper stages uses mostly LH2 and O2, having a lower density.
Another example is the Shuttle. The orange tank (with LH2 and O2) weig
