When the third child heard this, his face turned red and nodded in response.

The little goldfish laughed and cheered and joked, and the third child waved in disgust to shut them up.

Seeing them laughing, Zhou Jimin said again:

"That's right, I'm going back to the capital in the afternoon, and I'll come back in two days, and you'll look at ......them in the past two days."

"Okay, big brother, don't worry."

Anyway, it's not the first time, of course Zhou Jimin is relieved.

In the afternoon, Zhou Jimin left the small city of June Fourth and stayed in the capital for two days.

The current situation of the little fat pig is slightly better, but it is also limited.

At the age of more than a year, he still has to be supported to walk, trembling slightly and stumbling, much worse than his older brothers and sisters.

Zhou Jimin checked the little guy as usual and confirmed that there was nothing wrong with his body, which made him feel a lot more relieved.

This child is the child he and Ding Qiunan are most worried about, and they have put too much effort into it.

But he is like nine out of ten tricks, he doesn't know anything, whether it's talking or walking, it's like this, it's really heartbreaking.

"When he's two years old, I'll feed him the space spring water and see if it will improve."

Thinking silently in his heart, Zhou Jimin put this matter aside.

He has many children, and his hope for them is to grow up healthy and happy.

Whether it is the child born to Ding Qiunan or the child born to Qin Jingru, he treats them equally.

Only the little fat pig, from birth to the present, really worries him.

It is said that the three-year-old looks eighty, and in the current situation of the little fat pig, if it does not return to normal before the age of three, Zhou Jimin is really anxious.

Among the babies and toddlers born all over the world, there will always be some children who are contaminated with some strange diseases.

Although the little fat pig looks very healthy, for now, he should have those so-called hidden diseases.

Alas!

After staying in the capital for two days, Zhou Jimin returned to the small city of June Fourth and continued to be reckless.

The engine is still in the wind tunnel laboratory, and there is no way to carry out the next step of research at the moment, so let's tinker with the missile propulsion system.

This time, he didn't use the new material.

Bai Yi alloy materials are too expensive, and he doesn't dare to use them on missiles.

Besides, it may not be appropriate.

Intercontinental missiles, also known as ballistic missiles, usually consist of a propulsion system, a warhead, a missile body structure, and a guidance system.

At the moment there are no other types of ICBMs, there is only one, and that is land-based ICBMs.

The research and development of the propulsion system of land-based intercontinental missiles has actually involved rocket launch thrusters.

After all, the maximum speed of the future ICBM will be Mach 27.

At present, the ICBMs of the two countries, the polar bear and the bald eagle, have a maximum speed of more than Mach 20.

However, in fact, it is useless to be fast, it is too restrictive.

In addition, the error of precision strikes is very large, generally around 2.5 kilometers to 5 kilometers, and the deviation is extremely large.

Of course, even if the deviation is large, the nuclear warhead of an intercontinental missile is quite powerful.

Due to the reference materials, when Zhou Jimin participated in this project, he proposed that the power of missiles should not be improved simply by relying on large yields, but should be carried out in terms of precision strikes, maneuverability, and miniaturization.

In particular, it is necessary to develop advanced technologies such as starlight guidance and radar guidance for the guidance system, and to develop a quick-burning engine that can automatically shut down and fly missiles at an altitude of 80 km.

Spray anti-laser materials or other protective materials on the surface of the missile to improve its own protection ability, etc.

These ideas put forward by him have been unanimously appreciated by the experts of the overall project team.

After all, precision strikes and mobility capabilities are what are most needed on the battlefield.

If it is the Polar Bear and the Bald Eagle and their current land-based missiles, once they are discovered by satellites, then one ICBM will pass, and the entire missile launch base will be scrapped.

However, vehicle-mounted ICBMs with ultra-high mobility are not afraid of these at all, and coupled with the ability to strike accurately, this is the enemy's nightmare.

Since the establishment of the project, the overall project has been progressing quite quickly.

62 Town also participated, after all, the guidance system still needs their participation.

Other missile propulsion systems, such as the quick-ignition engine, are in charge of the propulsion system.

At present, the progress on Zhou Jimin's side can be said to be completely no progress.

The quick-ignition engine was put to the end by him, and at the moment he needs to deal with the rocket engine.

The rocket satellite developed by the small town of June Fourth only reached Mach 17 in terms of speed, and it was useless to just copy it and improve it, and it was useless to use it as a missile propulsion system.

First, the rocket satellite is still too large, and its launch and take-off propulsion weight is in the 100-ton range.

The weight of vehicle-mounted missiles is generally less than 100 tons, and more than 40 or 50 tons.

In other words, its propulsion system will be more advanced, faster, and the fuel weight of the propulsion will be lighter.

The weight of the propulsion system has already reached seventy or eighty tons, and the weight left for the other warheads, missile body structures and guidance systems is only twenty tons, right?

Even then, such a missile is quite bloated, and the requirements will be very high for a vehicle that carries a missile on its maneuver.

After all, generally speaking, the load of large trucks is about ten tons, and the fuel consumption per kilometer of super-heavy trucks transporting 100-ton tons will be very amazing.

As for the vehicle-mounted missile, the maneuverability is more important, so under the condition of ensuring the power of the missile, try to reduce the weight of the missile itself, so as to ensure its mobility.

A few days later, the wind tunnel laboratory was completed, and Zhou Jimin began to inspect the engine.

An improved high-speed ramjet engine made of a new type of white alloy material has no problems at all.

The tests in the indoor wind tunnel laboratory have been completed, and the next step is the outdoor wind tunnel laboratory.

All steps must be taken according to the plan, and no step should be missed.

Zhou Jimin still spares his life, although he has space, it is almost difficult to encounter danger.

But who knows?

Rebirth has happened, how can he guarantee that nothing will happen?

The little life is his own, not someone else's.

"Dad, is there something happy about it? Would you like to share it with us? ”

While the laboratory was conducting tests, Zhou Jimin walked out of the study and came outside to relax.

Recently, except for the two days he spent in the capital, the rest of the time was in continuous rotation, and he almost never stopped.

I finally went out for a walk today, and the children were playing in the yard on the weekend.

Seeing their father smiling and wandering around, they all came over and surrounded him.

"Well, Dad did have a happy encounter because Dad solved a big problem......."

The kids didn't ask, and pulled him along to play games.

Compared to the capital, here in the small city of June Fourth, there are more games they can play.

Especially those toys at home, every time they invite their friends to play at home, they can always get the exclamation of their friends.

In exchange for these toys, some of them have foreign friends who invite them to play some games of their own.

There are many different ways to play children's songs, playing newspaper games, card games, and catching singles or not doubles.

After playing with the little children for more than an hour, Zhou Jimin left the house and went to the satellite communication office.

"Xiao Yan, isn't Lao Zeng here?"

Here in the communication office, Yan Ziyue was busy with his head down, and he didn't look up when he heard the sound of Dika coming from the door.

It wasn't until Zhou Jimin's voice sounded that he saw that it was Zhou Jimin.

"Hello Boss Panda, it's like this, Director Zeng is on the research institute's side, and he is not here."

Yan Ziyue hurriedly stood up and said respectfully.

"It's okay, Lao Dong is inside, right?"

"Yes, Team Leader Dong is in the office inside."

"Okay, you're busy, I'll go over by myself."

Zhou Jimin nodded and didn't say much to the other party.

After all, his identity is different, and an ordinary researcher like Yan Ziyue will still be somewhat nervous when facing him.

Coming to the office inside, Zhou Jimin simply told Dong Chuanan.

The latter is the leader of the project team of the Satellite Communications Office, and is one of the responsible persons of the entire Communications Office except for Zeng Qingfeng and a few others.

When I came to see this person today, I naturally didn't come to talk about it, but to ask about the satellite communication system.

According to Dong Chuan'an, the seven satellites in space are currently working well, and from the previous tests, they can basically communicate across the country.

However, it is currently difficult to test in other parts of the world, so it is basically limited to the mainland.

"No problem, next time I will go to a different place to assist you in the test, by the way, there should be no problem with the North and South Poles, right?"

When Dong Chuan'an heard this, he was stunned for a moment, and then shook his head, "The communication between the two poles is theoretically no problem, but the signal may not be so strong......

You know, the north and south poles are the places where the earth's magnetic field interferes the most.

Therefore, even if it is satellite communication, it is not so easy to achieve communication between the north and south poles.

Of course, there is no need to go to the North and South Poles to conduct scientific research activities now, so it doesn't matter if you can talk on the phone or not.

After the problem of satellite communication is solved, the next step is the navigation system.

As we all know, a satellite navigation and positioning system requires at least four satellites to determine the user's three-dimensional position information, i.e., longitude, latitude and altitude.

In other words, the navigation system has actually been solved.

It is possible to share a satellite between navigation and communication, and there is no need to launch additional satellites.

Of course, if you want to get more accurate navigation information, then just four satellites are not enough.

A minimum of forty-five is also needed, just like the Beidou navigation system.

However, in the current June Fourth town, there is money but no one, and many materials are not so easy to obtain.

So, if you want to launch the next satellite quickly, wait slowly.

After learning about it, Zhou Jimin left.

Then he went to the Aircraft Research Institute and stayed with Xu Lei for a long time before going home for dinner.

Not to mention, at present, the aircraft research institute has become more and more standardized, and the innovation ability is getting stronger and stronger.

It's just that they are still diligently pursuing technologies such as vertical take-off and landing, but Zhou Jimin is holding on to it.

Send them away in one sentence, the manufacturing capacity is too poor.

Every time Xu Lei, they want to ask, what's wrong?

As a result, Zhou Jimin directly asked: Can you make high-temperature resistant materials that can withstand tens of thousands of degrees of heat?

Hiss!

It's just such a question, and I stopped them directly.

It is clear that in addition to this high-temperature resistant material, there must be other thresholds for this material.

It's been more than three years since the establishment of their aircraft research institute, but they are still trying to increase the speed of their engines from Mach 1.05 to Mach 1.1.

On the contrary, Zhou Jimin built a supersonic aircraft early.

It is no secret that the speed of the six-five supersonic aircraft is within the aircraft research institute.

Hypersonic speed of more than Mach 3, shocking and invincible.

Philip wanted Zhou Jimin to write down the relevant requirements of the material, so that they could find or study such materials.

In this regard, Zhou Jimin said that it is useless for you to twist together the materials science experts, chemistry experts, physics and mathematics experts in the small city of June Fourth.

Can't take it out!

Why?

Because the material of the 65 supersonic aircraft is a white alloy material that fuses gray and white metal, this thing is only available to him.

At present, the only countries on the earth that can make such materials are polar bears and bald eagles.

But it is not possible to build an airplane with qualified materials.

Therefore, the manufacturing industry that Zhou Jimin has been emphasizing is not good, but it is not a joke.

And how can it be so simple to create a high-temperature resistant material that can withstand ultra-high temperatures of 10,000 degrees?

Reaching such a level of factory means that the manufacturing level of the whole industry has reached an extremely high level.

Anyway, for now, it's Earth.

The next day, Zhou Jimin did not go out, but stayed in the study and tossed the missile propulsion system.

Miniaturized propulsion systems mean that missile engines will have to be smaller, but they will have to be faster.

It's a bit of a brain-burner!

It's not just the material that's limited, it's the fuel.

After two days of tossing, in the outdoor wind tunnel laboratory, four engines have completed testing, and there are no problems at present.

Finally, it's assembled.

At this point, Zhou Jimin was also excited.

Once assembled, it's tested in an outdoor wind tunnel lab, and once it's done, it's ready to go.

It's an exciting time.

It took two days for the outside world and ten days for space to complete the assembly, and then Zhou Jimin put the aircraft in the outdoor wind tunnel laboratory for testing.

This new hypersonic aircraft, first of all, is similar in appearance to the 65 aircraft, but it is much smaller, but it is more sci-fi.

And the tail fin, wings, etc. have been greatly improved to avoid radar scanning.

As we all know, the working principle of radar is very simple, that is, the principle of electromagnetic wave coherence is used to complete the search, tracking and measurement of targets by radar.

In the past, the wings and tail were easily tracked by radar electromagnetic waves and fed back signals to the radar receiver.

After the improvement, the radar system is equal to blindness, that is, the invisible purpose is achieved from the monitoring system.

The second is that there are only twenty-eight seats, and the location is relatively compact, and there is no lounge at the back.

In other words, there are really only twenty-eight passengers.

In order to make the plane invisible, the plane sacrificed a lot of entertainment facilities.

In the end, the aircraft has four engines, which can be described as quite powerful in terms of power.

Let's put it this way, according to the speed of laboratory tests, the ultimate speed of this aircraft can reach Mach 12.5.

Even if only one auxiliary engine is flying, the flight speed can easily exceed Mach 3 when the main engine is turned off.

That's the awesomeness of these four engines.

Simple superimposition will increase the speed, but in fact, if the aircraft materials and overall system are not good, they cannot be superimposed at all.

After all, the flight speed of Mach 12.5 is simply terrifying.

This speed, anywhere in the world, can basically be achieved in an hour.

However, whether it can be like a 65 supersonic aircraft is not completely certain.

Waiting for the test was very painful.

Zhou Jimin did not continue to stay in the space, but came outside, went to the medical research institute outside, and started research with others.

Zhang Fei is sitting in the clinic, and he goes to work on time and gets off work on time every day.

Seeing Zhou Jimin coming in, he smiled and nodded to say hello, and then continued to ask for a consultation.

For Zhou Jimin, Zhang Fei is very grateful.

But only in gratitude, for him, where to work is not work?

Not long after, the consultation ended, and Zhang Fei chatted with Zhou Jimin.

Everyone is a busy person, although they are also in the small city of June Fourth, but it is rare to chat.

Of course, Zhou Jimin is not chatting, but talking about medical matters.

Earlier, he had asked Zhang Fei about the little fat pig, but after Zhang Fei read it, he also said that he couldn't do anything.

Because the little fat pig is not sick, or he is not sick at the moment.

Preterm birth involves more aspects of medical knowledge and requires a large amount of data to support it.

With the current level of technology, it is difficult to publish it.

However, Zhou Jimin did not come today to consult about the little fat pig, but simply asked for some medical knowledge, and simply wanted to change his brain.

After chatting for a long time, he returned satisfied.

Back at home, Xiaoxian and the others were also out of school, and he took the children to cook together.

Zhou Qingxian, who is more than eight years old, has long been able to cook.

It's just that the height is not too high, and the third and fourth are all there, so the task of cooking is naturally not Xiaoxian.

In the next few days, Zhou Jimin spent such a relaxed life.

Philip and the others were happy, and pulled Zhou Jimin to run to the Aircraft Research Institute, hoping that he would help solve some of the current problems.

However, the research and development of aircraft engines, to put it mildly, is still a competition between manpower and manufacturing level.

Therefore, it is unlikely to rely solely on Zhou Jimin's words.

Unless Zhou Jimin opens directly, but this kind of thing, it is useless for him to open and hang, and the level of manufacturing industry has to be comprehensively improved.

A few days later, the tests of the aircraft were finally completed.