Development Trend of Liquid Hydrogen-Fueled Rocket Engines (Part 1: Performance and Operation)

SpaceX's successful development of reusable rockets and the realization low-cost operations have significantly impacted space industry, institutions, companies. Price competitiveness has become a hot topic for launch vehicle development. A hydrogen-fueled rocket engine can be its solution. The developed countries are attempting to improve performance reliability engines using hydrogen-fuel. This paper summarizes operation trends countries. It provides fundamental data development, which is expected helpful in future