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