The second day began with the Space Agency's new-generation manned spacecraft experimental vessel, which has now completed its 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 is very similar to the scheme provided by the system, which finally made Lin Ju interested.

This is the end of the presentation of the national team, and it is finally the turn of the private team.

I don't know if it's deliberate, Xinyuan Aerospace was ranked last, and the first two were just registered this year, so you can really only talk about PPT.

However, Lin Ju's memory does not have hyperbola and Ceres, but the projects they exhibit are very similar to the active rockets of Xinyuan-1 and empty forks, which seem to be affected by the butterfly effect.

Finally, Anderov received a reminder and was ready to go to power.

Lin Ju, who had been sitting in the first row, finally had the opportunity to turn his head and observe everyone's reactions, and sure enough, he focused his attention, and he didn't know whether it was good or bad.

Because it is an exchange meeting, there will be a question process after explaining a part, and it is conceivable that Anderov will receive no fewer questions.

“…… I am Anderov, the chief designer of the Xinyuan-1 modification, Xinyuan-2, Xinyuan-3, and Xinyuan-4 series rockets, and the deputy chief designer of the H1 and H2 space shuttles. I would like to introduce you to Xinyuan's future space planning:

Xinyuan No. 2 ......

Xinyuan No. 3 ......

Finally, we have prepared a super giant rocket for Mars and deep space targets, Xinyuan-4:

The diameter of the rocket body of Xinyuan No. 4 is the same as that of Xinyuan No. 3, but the first stage will be changed to 27 240-ton oxygen-rich class-rich combustion liquid oxygen and liquid hydrogen engines, which will be placed in a three-circle layout of 17+9+1, and at the same time, 4 four-stage solid boosters will be bundled, each with 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 is quiet;

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

But when Xinyuan No. 4 came out, no one sat still, and suddenly a whisper sounded, and it lasted for a whole minute before being suppressed.

Because the big guy on the stage was drinking water just now, he was choked by this data and was covering his neck.

"Ahem, quiet! Listen...... Ahem, Chief Anderov continues to explain! ”

The big guy who has slowed down is also a divine beast in his heart, and Xinyuan No. 2 and No. 3 have corresponding plans; It's not surprising that you Xinyuan Niu have a plan, but what kind of monster is Xinyuan Four? The take-off weight is comparable to two missile destroyers ?!

Anderov was not affected at all and continued to paint his amazing pie:

"The low-earth orbit capacity of Xinyuan-4 will reach an unprecedented 800 tons, and the Mars orbit capacity will reach 200 tons, and two rockets will be able to send a 300-ton combined spacecraft to Mars!

Well, okay, now it's question time. ”

Swish.

As far as the eye can see, it is all erect palms, as if they are a palm bush.

Anderov casually stretched out his hand and pointed, he didn't know anyone anyway.

Stand up a young man:

"Chief Engineer Anderov, 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, and the thrust of liquid engines varies from 80 to 380 tons, and the thrust of single-stage solid rocket engines must be 700 tons to meet the target requirements.

How much money and manpower does Xinyuan plan to use to carry out research on four types and five thrust giant rocket engines at the same time? ”

This question directly asked the voices of everyone present, a high-thrust engine takes almost 10 years to design and perfect, Xinyuan has launched so many projects at the same time, and it doesn't brag about it!

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

"What!"

As soon as Anderov's words fell, an exclamation came from the seat in front of him, but he saw Tang Weitian being pressed on the chair by two people to prevent him from standing up.

The person sitting next to him clearly heard Tang Weitian's words:

"The 220-ton single-combustion chamber methane machine is off the assembly line, and we still have a fart!"

"Calm down, calm down, Chief Engineer Tang."

"I can't calm down, ahhh......h

Not only did it directly make the Sixth Academy crazy, but the successful test run of the 220-ton methane engine successfully caused a riot in the audience, and even the top superior asked the gray-haired chief engineer next to him:

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

"We want four nozzles, they only need one, and the thrust of a single combustion chamber is twice as high as ours."

"Can we do that?"

"This ...... We need financial support, and we haven't made a methane machine, so we can do it by 2025. ”

“……”

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

In the first round, Anderov won completely.

Followed by the second person, this time Lin Ju knew everyone, and was the deputy chief engineer of the future heavy manned rocket.

"Hello Anderov, I see that you have a large number of first-stage engines of the rocket, reaching 9, 19 and 27, all tightly packed in a circle, and as many as 27 engines working together will bring strong vibration and extremely high risk to the rocket body.

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? You must know that the precedent of the N1 rocket has clearly told us the danger of multiple launches in parallel. ”

In fact, if it is a PPT drawn by someone else, the audience in the audience will not care whether your cowhide will be broken, only Xinyuan is too outrageous, and the previous performance will cause everyone to seize the opportunity to target.

Moreover, it is very representative to take the N1 rocket, 30 NK15 liquid oxygen kerosene engines are installed on the first stage of the N1, and as a result, four rockets were blown up in a row, which has become a well-known counterexample in the aerospace industry.

But Anderov did not panic at all, because he until the parameters of the system are absolutely reliable, so there is no need to worry about the design.

"I would like to correct that 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 think about it differently:

The control system of the Xinyuan-4 rocket allows up to four engines to be turned off, at which point the other engines will correct their course by yaw and output at least 6,000 tons of thrust at 108% of the power, relying on redundant fuel to still complete the mission.

The probability of at least 26 of the 27 engines working normally is 94%, and the probability of at least 25 working normally is more than 96%, and now we only require it to have at least 23 units that can be used, which is close to the reliability of a single engine. ”

After Anderov finished speaking, the audience fell silent, and then someone turned on the computer and began to calculate.

The deputy chief engineer who asked the question was also shocked, and the first thing he thought was: Can the rocket still play like this?

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

It is common sense that the fuel of each stage of the rocket is overfilled, so that there is a certain range of adjustment in case of unexpected situations.

The short-term overpower operation of the rocket engine is the norm, and the output of 108% can only be said to be generally not too exaggerated.

So think about it the other way around: the control system doesn't need to work hard to ensure that all 27 engines work perfectly, only more than 23 engines need to complete the task.

The probability of one engine failure is 0.01, and the probability of four failures at the same time is indeed negligible.

IT CAN BE SAID THAT AS LONG AS THE ROCKET DOES NOT BANG AND EXPLODE INTO A BIG FIREWORK, IT IS ALMOST GUARANTEED THAT THE MISSION WILL BE ABSOLUTELY SUCCESSFUL.

It's not half a century ago, when the N1 rocket didn't have today's powerful control system, and the production quality of the alliance was always worrying, and the idea of Xinyuan-4 was completely feasible.

Nu's efforts to improve the reliability of the rocket engine to 99 percent are much easier than having all 27 engines work well.

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

A rocket with 27 engines will be more reliable than a rocket with a small number of engines!

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

Only Lin Ju knows that the H240 is based on the improvement of the H500 giant hydrogen-oxygen engine given by the system, and the reliability of the latter is not 9

99 percent, but 99.2 percent.

Although the first ignition of this series of engines on Earth has not yet been carried out, in fact it has been successfully used thousands of times, and has undergone countless improvements, almost the ultimate optimized design of the hydrogen-oxygen engine.