The old cat stepped on the gangway, slowly descended, and looked up at the lander.

From a close distance, the Eagle spacecraft looks like a white tower standing in the desert, with smooth lines, after all, there is an atmosphere on Mars, so engineers had to add a fairing to it when designing the lander, and it could not be like the Apollo lunar module back then.

The sunlight on Mars is almost temperatureless, the twelve-meter-tall fuselage is milky white under diffuse reflection, and in fact the back of the Eagle spacecraft is made of a composite of silicone and PEEK, which is actually translucent when viewed up close.

"Old cat, how's your situation over there?" Tang Yue asked, "I just successfully figured out what VLBI means with the same beam. ”

"I'm checking for a downgrade." The old cat replied, and the sunlight cast a huge shadow on the lander.

"I still have more than 10,000 items to check on my side." Tang Yue shook his head, "I really doubt that it can really be done within two days." ”

"If you can't do it, you have to do it." The old cat said, "The Eagle is the last lifeboat, and without the supplies you sent, that little girl will definitely die...... But if you have enough confidence in this lander, then you can leave it unchecked. ”

"Is it really possible to leave it unchecked?"

The old cat nodded, "Anyway, this spaceship has been inspected on the earth, as long as you believe in the excellent quality of this spaceship, believe in the designers on the earth, believe in their ability and character, believe in the technology of Boeing, Loma and the Aerospace Science and Technology Group, and believe that they will not cheat you." ”

"Then I might as well trust God."

Tang Yue shook his head and continued to work.

The old cat descended to the bottom of the lander.

The lower half of the Eagle spacecraft is the descent stage, which includes a first-stage thrust reverser rocket and four stout landing pads, the thrust reverser of the Eagle lander is two Raptor 3D liquid oxygen methane engines connected in parallel, each engine has two combustion chambers and two nozzles, and the two engines have a total of four nozzles, which can produce more than 150 tons of thrust when started.

When the Eagle spacecraft landed vertically, it relied on the rocket engine of the descending stage to slow down, and the other four swimming engines were responsible for controlling the attitude, and at the last 50 meters above the ground, the lander opened the landing gear and finally landed safely.

The old cat stood under the lander, looking up at the huge nozzle of the Raptor engine.

The nozzle is embedded, big enough to drill into an adult, the bottom of the Eagle spacecraft has very obvious ablation marks, the shell around the nozzle is scorched black, and the temperature of the high-temperature gas ejected by the thrust reverser rocket can exceed two thousand degrees Celsius, which is a rather terrible number, there are not many materials in human hands that can withstand such a high temperature, so the shell around the engine nozzle is a high-temperature resistant zirconium carbide ceramic material.

The old cat scrutinized the engine's nozzle, the rocket engine's convergent diffusion nozzle was actually a very complex structure, it was not what most people imagined, just a simple conical funnel. The entire nozzle is made up of layers of thin tubes that are filled with liquid oxygen to cool down when the engine starts.

The old cat pulled out the wrench from the tool pocket on his chest.

It opened the casing of the lander, revealing the engine body and dense wiring in it.

In order to facilitate maintenance, the designers reserved a special maintenance window on the fairing of the Eagle spacecraft, and when you open the cover, you can directly see the situation inside.

"It's a turbopump...... Combustion chamber ......"

The old cat muttered to himself, while reaching out to pull the messy cable in the spacecraft, the Raptor 3D rocket is clearly an American man-made thing, it is a product of SpaceX, but for some reason this line has a strong hairy style.

The chaotic and violent aesthetic that the Russians admire, with their unrivalled ability to maneuver through the failing base plates, and finally twist them into a powerful whole, as was demonstrated when they made the MiG-25 out of nickel-based alloy steel.

What is nickel-based alloy steel called?

In human terms, it is stainless steel.

The Russians are the only ones in the world who use stainless steel to build airplanes.

“…… This is the tank, this is the gas generator...... No, the gas generator ...... here"

The old cat compares the engine in front of him with the design in his head, but it is clear that the design is a seller's show, clean and concise, and looks like a high-tech product of the future, while the thing in front of him is a buyer's show, as if it is an old antique from the last century.

The dense rows of wires are dazzling, and the old cat can't wait to poke his head in.

"It's a flow control valve...... What is that? Electro-hydraulic servo valves? Wrong...... The electro-hydraulic servo valve is here, that's the injector......"

The old cat patiently used a long stick to pull the lines one by one, and opened his eyes wide.

"This tube transports liquid oxygen ......"

"Huh? No, what is this line for? ”

"It's an oxidizer pump."

"Hmm...... Well? Why is this screw screwed backwards? Is the assembler a left-hander? ”

"Why are there two lines here?"

"Where does this line lead? That's not right...... Isn't it supposed to go through the throttle circle? Why did you come to the heat exchanger? Brother, you're in the wrong place, aren't you? ”

"There must be something wrong here, the turbine must overheat like this, it's a miracle that the rocket didn't blow up."

The old cat's head began to sweat.

"Huh?"

"Uh-huh?"

"Uh-huh, uh-huh?"

"No, that's not how it was drawn on the blueprints...... Wait, why is there still a word on this box? What to write...... Oh, Eliza...... Your ass is so sexy...... Damn, who wrote this? ”

The old cat's head began to catch fire.

"That's not right here."

"It's not right here either."

"It's not right here, it's not right, it's not right, it's not right, it's not right!"

"I'm leaning on, leaning on! This rocket was fucking bought on Pinduoduo! ”

The old cat was so irritable that he got up, angrily grabbed the messy and annoying lines in front of him, "tore and pulled", and pulled it away.

Suddenly it was much cleaner and fresher.

Much cleaner and fresher.

Much more refreshing.

Much cooler.

It's cool.

Old Cat: ......

"What's wrong?" Tang Yue asked, "Old cat, what's going on over there?" ”

The old cat was silent for a few seconds.

"Hmmm......"

"What's the matter, old cat? What went wrong? Tang Yue then asked.

"Question...... It's no problem, you go ahead with your job, don't worry about me, I'm fine here. ”

The old cat looked at the sky and whistled, pretending that nothing had happened, and silently hid a large handful of wires in the heart of his paws behind him.