Launch of U.S. moon landing rocket delayed again

The U.S. new-generation lunar rocket "Artemis 1" was originally scheduled to launch on the 27th, because a tropical storm may have passed the launch site that day. Several attempts to launch Artemis 1 failed due to engine failure and fuel leaks.


  The cancellation of the Sept. 27 launch marked the fourth delay in the planned U.S. lunar rocket launch. On August 29, NASA's first attempt to launch "Artemis 1" was cancelled due to an engine failure. On September 3, the launch was postponed again due to the leakage of liquid hydrogen. After experiencing multiple fuel leak problems, on September 21, NASA finally successfully completed a fuel test of the rocket. The third launch, which was supposed to take place on September 23, was delayed to the 27th due to various preparation issues.


  NASA decided to cancel the launch after a meeting early on the 24th. The NASA website announced that it will decide whether to transport Artemis 1 back to the final assembly building depending on the weather conditions on the 25th. The Associated Press reported that if the rocket is transported back to the final assembly building, the launch attempt may not be attempted until November at the earliest.


  According to the weather forecast, Tropical Storm "Ian", currently in the Caribbean Sea, may develop into a hurricane by the 26th and reach the Florida coast by the 29th. The entire state of Florida, including the Kennedy Space Center, is on the likely path of the eye of the storm.


  According to the report, this is the first time the United States has carried out another moon landing plan in half a century. The Associated Press quoted NASA senior test director Jeffs Poulding as saying that the moon landing team has been overcoming technical problems with fuel leaks for the past few months.


  According to the Associated Press, on April 1 this year, NASA began a two-day critical test of its Space Launch System (SLS) heavy rocket and a simulated countdown. But a leak of hydrogen fuel interrupted the "dress rehearsal" and NASA carried out "extensive repair work". In 2 tests conducted in June, there were still leaks of hydrogen fuel.


  It is understood that the rocket used in this lunar landing plan is 98 meters high and weighs about 2,495 tons when filled with propellant. It is the "most powerful rocket" NASA has ever built, "even more than half a century ago. used 'Saturn V' rocket".


  The U.S. says if its mission goes well, astronauts will land on the moon in 2024, and two people will land on the moon in 2025. Prior to this, the "Space Launch System" carried the "Orion" spacecraft to carry out an unmanned flight test code-named "Artemis 1" around the moon. After the success of this mission, the "Artemis 2" manned flight test will be carried out.


  "Artemis 1" unmanned flight around the moon for 42 days. The Orion spacecraft will fly as close as 60 miles above the moon, and a major focus of the test mission is to study the risks posed by radiation to astronauts.


  Orion was originally scheduled to return to Earth on October 10, landing on the coast of California. If all goes well, NASA says the U.S. will send manned spacecraft to the moon within the next few years. However, officials have also warned that the mission is high-risk and the mission time may be shortened.

According to industry insiders, the progress of the U.S. moon landing rocket has not been smooth. The first is unrealistic planning. In 2005, the United States formulated a plan to land on the moon. The plan was to use this launch vehicle, which has been repeatedly delayed, and the investment in development costs is bottomless. Its R&D planning is very unscientific and imprecise. $30 billion has been invested before and after, and a lot of money is still needed.


  The second is technically contrary to science. This SLS rocket has three engines, namely solid booster, core-level main engine, and core-level secondary engine: the solid booster is the main booster, and the booster recovered after it was used in the past is still in use; The core-level main engine is a low-temperature hydrogen-oxygen engine, but it is not coordinated with other components; the core-level secondary engine was developed and manufactured in the 1960s, and its technology and materials have long since aged.


  Furthermore, they are structurally incompatible with each other. The engine of this rocket is located at the right rear of the combination, carrying both the combustion agent and the oxidizer; after the rocket is ignited, the two agents enter the combustion chamber at the same time, and the gas flow is ejected from the tail to form the rocket thrust. In modern times, there are new technologies such as extrusion cycle, gas generator cycle, electric pump cycle, staged combustion cycle, closed and open expansion cycle, etc., but they still use the old structure; the current high-performance rockets in developed countries are also at the same time. The two-agent is pressurized, but in order to prevent incomplete combustion, a staged combustion cycle is often used. American nozzles are heavy and uncoordinated, and their regulating valves repeatedly fail due to aging components and repeated use.


  Beijing Business Daily comprehensive report

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