This modest part pack is designed to provide some new rocket engines that run on Liquid Hydrogen and Oxidizer. There are six models provided, two in each of the 1.25, 2.5 and 3.75m sizes. These engines have better fuel efficiency than the KSP 1.0 stock engines, up to 455s, but beware! They're more expensive and produce less thrust per unit weight. In addition, liquid hydrogen is less dense than liquid fuel, so for the same Delta-V, you will need more tanks.
Check the images section for screenshots
To store your liquid hydrogen fuels, I've provided ModuleManager/InterstellarFuelSwitch configs that allow you to change the contents of stock tanks between LF/O, LH2/O, LF, O and LH2. These should work with most mod tanks, but no promises.
This pack bundles InterstellarFuelSwitch by FreeThinker, distributed under its own license, BDAnimationModules, distributed under its own license, ModuleManager, distributed under its own license, and CommunityResourcePack by RoverDude, also under its own license.