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Recently, the three-stage liquid hydrogen and liquid oxygen engine of the new generation manned carrier rocket that will be used for manned lunar landing in the future completed a long-range test in a high-altitude simulated environment, verifying the feasibility of the engine to work for a long time in space. The test was a complete success.

The test was conducted on my country's newly built vertical high-altitude simulation test bench, which is currently the world's longest high-altitude simulation test bench for hydrogen-oxygen engines. The success of this long-range high-altitude test indicates that my country's high-altitude simulation test capability for liquid hydrogen and liquid oxygen engines has reached the level of thousands of seconds, greatly improving my country's high-altitude test capability for liquid rocket engines, and will strongly support the smooth implementation of my country's manned lunar exploration project.

Engine testing is an important part of the rocket development process. From a valve to a complete engine, all parts must be ignited on the test bench to verify the rationality of the design and process reliability. There are dozens of types of tests, which will run through all stages before and after the rocket development. Each stage of the test has different significance, and the ignition time ranges from a few seconds to thousands of seconds.