I ask you to build tractors, but you build rockets?

The next day started with the space agency's new-generation manned spacecraft experimental ship, which has now completed basic design and begun trial production.

As a manned spacecraft with a maximum take-off weight of 21 tons and a capacity of 6 people, it was very similar to the solution provided by the system, and Lin Ju finally became interested.

The national team’s display ends here, and it’s finally the private team’s turn.

I don’t know if it was intentional, but Xinyuan Aerospace was ranked last. The first two people just registered this year, so they really could only talk about PPT.

However, there was neither Hyperbola nor Ceres in Lin Ju's memory. Instead, the projects they exhibited were very similar to the current rockets of Xinyuan 1 and Kongcha, which seemed to be affected by the butterfly effect.

Finally, Androv received the reminder and prepared to take the stage.

Lin Ju, who had been sitting in the front row, finally had the opportunity to turn his head and observe everyone's reaction. Sure enough, they all focused their attention, and he didn't know whether it was good or bad.

Because it is an exchange meeting, there will be a question-and-answer process after part of the explanation. It is conceivable that Androv will receive a lot of questions.

"...I am Androv, the chief designer of the Xianyuan 1 modification, Xianyuan 2, Xianyuan 3, and Xinyuan 4 series rockets. I am also the deputy president of the H1 and H2 space shuttles. Designer; I will introduce to you Xinyuan’s future aerospace plan:

Xinyuan No. 2...

Xinyuan No. 3...

Finally, there is the super giant rocket we have prepared for Mars and deep space targets, Xinyuan 4:

The rocket body diameter of Xinyuan 4 is the same as that of Xinyuan 3, but the first stage will be changed to 27 240-ton oxygen-rich staged combustion liquid oxygen and liquid hydrogen engines, placed in a three-circle layout of 17+9+1. Bundled with 4 four-stage solid boosters, each has a thrust of 2,800 tons, a take-off thrust of 17,680 tons, and a take-off weight of 15,500 tons! "

Speaking of Xinyuan-2, a heavy rocket with a take-off thrust of 1,600 tons, the audience was quiet;

Speaking of Xinyuan-3, a super-heavy rocket with a take-off thrust of 7,000 tons, the audience was quiet;

But when Xinyuan No. 4 was put out, no one could sit still. There was a murmur, and it lasted for a full minute before it was suppressed.

Because the boss on the stage was drinking water just now, and he was choking on this data and was covering his neck to breathe.

"Ahem, be quiet! Listen...ahem Chief Androv continues to explain!"

The big boss who had slowed down also felt like a beast was running through his mind. Xinyuan 2 and 3 had corresponding plans; Xinyuan Niu, it’s not surprising that you have a plan, but what kind of monster is Xinyuan 4? Is the take-off weight comparable to two guided missile destroyers? !

Androv was not affected at all and continued to draw his amazing pie:

"Xinyuan 4's low-Earth orbit transport capacity will reach an unprecedented 800 tons, and its Mars orbit transport capacity is 200 tons. Two rockets can send a 300-ton combined spacecraft to Mars!

Well, okay, now it's question time. "

Uh-huh.

As far as the eye could see, there were all raised palms, like a palm bush.

Androv raised his hand casually, but he didn’t know anyone.

Stand up a young man:

"Chief Commander Androv, according to your three launch vehicle designs, it will be applied to four engines: methane engine, kerosene engine, hydrogen and oxygen engine, and solid engine. The thrust of the liquid engine ranges from 80 to 380 tons, single-stage The thrust of the solid rocket motor must be 700 tons to meet the target requirements.

How much money and manpower does Xinyuan plan to use to simultaneously carry out research on four types of giant rocket engines with five thrusts? "

This question directly raised the voice of everyone present. It takes almost 10 years to design and perfect a high-thrust engine. Xinyuan has launched so many projects at the same time. It is bragging that there is no draft!

"Your question involves our company's trade secrets, but what I can tell you is that the liquid oxygen methane engine code-named M220 has completed prototype testing on Xinyuan's test bed five days ago, with a test thrust of 223 tons; and The 380-ton kerosene machine K380 and the 240-ton hydrogen-oxygen machine H240 are also about to enter the prototype trial production stage."

"What!"

As soon as Androv finished speaking, there was an exclamation from the seat near the front, but Tang Weitian was pinned down on the chair by two people and prevented him from standing up.

The people sitting next to him clearly heard Tang Weitian’s words:

"The 220-ton single-combustion chamber methane generator is offline, and we are still doing nothing!"

"Calm down, calm down, Mr. Tang."

"I can't calm down..."

Not only did it directly make the Sixth Institute go crazy, but the successful test run of the 220-ton methane engine caused a commotion in the entire place. Even the superior at the top asked the gray-haired chief engineer next to him:

"Isn't this 220-ton engine lagging behind our YF480?"

"Ours requires four nozzles, but they only need one nozzle, and the thrust of a single combustion chamber is twice that of ours."

"Then can we do it?"

"This... needs financial support, and we have never built a methane generator. We can complete it before 2025."

"..."

The superior understood and sat back with a straight face without saying a word.

In the first round, Androv won completely.

Then came the second person. This time the person was known to Lin Ju. He was the deputy chief engineer of the future heavy-duty manned rocket.

"Hello Androv, I saw that your rocket has a large number of first-stage engines, reaching 9, 19 and 27, all tightly packed in a circle. As many as 27 engines working together will bring the rocket body strong vibrations and extremely high risks.

If the reliability of a single engine is 98%, then the overall reliability will drop to 58%. How do you ensure the reliability of the rocket? We must know that the precedent of the N1 rocket has clearly told us the dangers of multiple parallel engines. "

In fact, if the PPT was drawn by someone else, the audience in the audience will not care whether your reputation is broken or not. Only Xinyuan's outrageousness and previous performance caused everyone to seize the opportunity to target it.

Moreover, the N1 rocket is very representative. The first stage of N1 was equipped with 30 NK15 liquid oxygen and kerosene engines. As a result, four rockets exploded in a row, which has become a well-known counterexample in the aerospace industry.

But Androv didn't panic at all, because he knew that the parameters of the system were absolutely reliable, so there was no need to worry when designing.

"I want to correct you. The reliability of the H240 is not 98%, but 99%, so the overall reliability of the rocket is 76%, but this is not important. Let's change our thinking:

The control system of the Xinyuan-4 rocket allows up to four engines to be shut down. At this time, the other engines will correct the course through deflection and output at least 6,000 tons of thrust at 108% power. The mission can still be completed by relying on redundant fuel.

The probability that at least 26 of the 27 engines are working properly is 94%, and the probability that at least 25 engines are working properly is already over 96%. Now we only require that at least 23 of them can be used, which is close to a single engine. The reliability of the engine has been improved. "

After Androv finished speaking, the whole place fell into silence, and then people kept turning on their computers and starting calculations.

The deputy general manager who asked the question was also shocked. His first thought was: Can the Rockets still play like this?

But it seems like it can really be played like this.

The fuel of each stage of the rocket is overfilled, so that there is a certain adjustment range when encountering unexpected situations. This is common sense.

It is normal for rocket engines to operate at super power for a short period of time. An output of 108% can only be said to be generally not an exaggeration.

So think about it the other way around: the control system does not need to work hard to ensure that all 27 engines work perfectly, it only needs 23 or more engines to complete the task.

The probability of one engine failing is 0.01, and the probability of four failing at the same time is indeed so low that it can be ignored.

It can be said that as long as the rocket does not BANG and explode into huge fireworks, the mission is almost guaranteed to be an absolute success.

This is no longer half a century ago. At that time, N1's rocket did not have the powerful control system it has today, and the alliance's production quality was always worrying. The Xinyuan 4 idea was completely feasible.

Working hard to improve the rocket engine to 99% reliability is much simpler than making all 27 engines work well.

Everyone else was also an elite, and they all quickly came to this incredible result:

A rocket with 27 engines will be more reliable than a rocket with fewer engines!

I don’t know who took the lead in applauding, and then more and more people applauded. The doubts about Androv turned into admiration at this moment.

Only Lin Ju knew that the H240 was improved based on the H500 giant hydrogen-oxygen engine provided by the system, and the reliability of the latter was not 9

99%, but 99.2%.

Although the first ignition of this series of engines on Earth has not yet taken place, it has actually been successfully used thousands of times and has undergone countless improvements. It is almost the ultimate optimized design of a hydrogen-oxygen engine.

When the computer is not around, I will send it via mobile phone, and monthly tickets and reward thanks will be sent later.

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