Xijing, Xifei Industry.

In the Yun 20 project department, in the huge assembly workshop, nearly 100 people are working overtime around a fat girl.

In fact, this is only the final assembly link, and in the major parts manufacturing workshops, there are more than ten times more engineers who are working overtime to participate in this 'competition'.

Dong Jun's goal is to complete the entire fuselage manufacturing process within two months, that is, before April 18, including the preliminary design inspection of the Y-20S, the model wind tunnel test and the actual manufacturing.

Now almost 25 days have passed, and the manufacturing progress of the fuselage is almost one-third complete.

Looking at the Yun-20S, which has begun to take shape, Dong Jun can't help but feel a little proud of the efficiency of his team.

In fact, if he wants to build it as quickly as possible, he can just get the drawings and just don't care about anything, just transform a Y-20 that has been almost built.

This can save at least 20 days.

But the pride and self-confidence in his bones made him disdain to win this competition by any opportunistic means.

Although he admits that Kangchi is indeed powerful, the difficulty of building a new engine is not at the same level as building an aircraft that already has a relatively mature production line, even if it requires a lot of improvements.

If this is all opportunistic, then he himself will look down on himself.

Moreover, the basic professional ethics also drove him to strictly inspect and demonstrate the design plan in accordance with the normal aircraft manufacturing process, and manufactured a full-scale model for wind tunnel testing, and only after confirming that there were no problems, did he start the actual manufacturing from beginning to end.

"Looking at the current progress, we may not be able to build it in 60 days, and we don't know what the situation is on the Kangchi side......"

"Who knows about him!"

Every time he talked about this topic, his expression was a little resentful.

Originally, they thought that after Kangchi went back, they would devote themselves to the research and development of the engine like them, but what happened?

First of all, it was rumored that Datang Heavy Industry Technology invested in Hafei and Changhe, and began to carry out drastic reform and upgrading of the management and production lines of these two companies.

Then he went to Gangcheng, Pingjiang, Dongyang, Modu and other group subsidiaries to inspect a circle, and the movement was so loud that even they could hear it.

Finally, do you still want to be interviewed by the media?

All kinds of actions made Dong Jun feel that Kangchi was either very self-aware and chose to give up directly.

Or they just underestimate them and don't take them seriously at all......

In either case, it's enough to upset them.

"Leave him alone, let's just do ours."

"Hmm...... I heard that not only Mr. Cai attaches great importance to this matter, but even Chief Shen and even the Elders' House have inquired about it, so if he can't get the engine at that time, he will be embarrassed by himself......"

"The House of Elders knows everything?"

"Whoever made his cowhide blow to the sky......"

“……”

While the two were chatting, Pei Hengsheng's secretary suddenly ran over in a hurry and informed them of something.

"March 26th? Eagle Base?! He built the engine?! ”

Dong Jun and Ji Jinliang, who received the notice, were immediately stunned......

——

On March 26, the Eagle test flight base.

Although it was noon, the weather today was not very good, although the sand and dust were not so big that the plane could not take off, but the yellow sand in the air still made the sky look a little dark yellow, and some cold wind also blew people's faces painfully.

Even so, from time to time, someone couldn't help but run out of the hangar, looking up at the sky in the distance, obviously a little impatient for what was about to appear.

"Didn't you say you'll be there in five minutes, why haven't you come yet?"

"It's only been two minutes, okay?"

"Only two minutes? How do I feel like ten minutes haven't been that long......"

Seeing Dong Jun and Ji Jinliang, whose expressions were both nervous and expectant, whispering while looking out from time to time, Cai Yaobin couldn't help but feel a little funny.

He can completely understand their feelings, on the one hand, if Kangchi really gets it out so quickly, they will lose this game, and they will have to shout that shameful word in front of everyone later......

But compared to this shame, as an aviation worker, they are looking forward to the emergence of domestic high-thrust engines more than anyone else.

It's quite contradictory anyway.

In fact, Cai Yaobin's complicated mood at this time is not much worse, but he is a leader after all, no matter how anxious he is, he still has the demeanor he should have, right?

What's more, the people standing next to him still came to visit Chief Shen and Chief Lu for this test run.

Reckless in front of the military bigwigs and the bigwigs of the Ministry of Science and Technology, how bad the impact is.

While everyone was anxiously waiting, the roar of the engine finally came faintly in the sky, and after hearing the sound, even the expressions of Chief Shen and Chief Lu couldn't help but change slightly.

"It's coming!"

Li Xiangnan, who used to be a test pilot of the Silver Crane, also pointed to the sky with some excitement.

The two chiefs walked a few steps outside, followed Li Xiangnan's hand, and sure enough, they saw a small black dot, as the engine sound became louder and louder, under the dark yellow canopy, a Y-20 got bigger and bigger, and slowly landed on the runway, until under the guidance of the ground staff, slowly slid into the parking garage.

This is the second time Kangchi has come to the Eagle test flight base, the last time he came to test the Yinhe, and he didn't know much about the test flight, so he only came alone.

But this time it was an engine test, so Kangchi directly brought the technical team of Datang Heavy Industries.

The core of this team has 108 people, per capita postdoctoral, is Kangchi in recent years to use money ability to save the family foundation, although not everyone has Yan Hui's level, but it will not be too bad, as long as the technology and tasks are separated, they can basically help Kangchi complete it very efficiently.

If it weren't for them, even if Kangchi had the drawings and technology, many things would not have been created so quickly.

However, this time there were only 36 people who came to the Soaring Base, all of whom were elite talents in the fields of mechanical equipment engineering, and they also participated in the production and manufacturing of the turbofan 30, and even the detailed test plan was directly handed over to them to formulate.

When he set off from Dongyang, when the pilot heard that there were 36 scientific research leaders on his plane, he really sweated in his heart, and even couldn't help but ask if he wanted to call a few more planes and transport them in batches......

If you're not afraid, you're afraid of 10,000,

If this is served in a pot, it will be nailed to the pillar of shame for a thousand years!

However, Kangchi knows the Yun 20 very well, although the performance is slightly less than the C17, but the stability is absolutely fine, so I think it is completely unnecessary......

After the crew opened the front cabin door, Kangchi couldn't help but show a surprised expression when he saw the two old people led by him.

The appearance of Chief Shen, a military boss, is understandable, but Chief Lu also came, which surprised Kang Chi.

Speaking of which, the two haven't seen each other for a while.

Kang Chi smiled and beckoned to them, then led Yan Hui and them off the plane, and began to greet everyone one by one, and briefly introduced Yan Hui and them by the way.

With this introduction, everyone knows that unconsciously, there are so many awesome scientific research talents gathered under the banner of Kangchi, even if there is no Kangchi, they can be regarded as the top R&D team in Huaguo.

However, there is no such luxury plastic surgery team in China, but it can produce results as intensively as Kangchi, and each of them is heavyweight, but no one can be found.

Not to mention domestic, you can't find a ...... in the world

So everyone was only slightly surprised, and then quickly turned their attention to the ground crew who was opening the chubby girl's ass.

As the crew carefully untied the rope, a rectangular container slowly slid out of the cabin through a pulley on the floor, and was steadily caught by a huge trailer.

Everyone immediately followed the trailer and began to transfer to the test workshop, and then after the staff unpacked the container, they finally saw what the engine looked like.

Why does it look so small?

This was Dong Jun's first feeling after seeing this engine.

The diameter of this engine is only about four meters, which is even smaller than the diameter of the turbofan 20 four meters four that Fat Niu is now carrying, and the diameter of the blades of the air intake is about 2 meters, and the shape is obviously different from that of traditional aircraft engines.

It's like a half-open umbrella with the top facing inwards embedded in the engine.

What is this design?

Dong Jun's heart was suddenly full of doubts.

It stands to reason that if you want to obtain greater thrust for an engine with a large bypass ratio, it is the most direct and effective way to increase the suction volume of the engine by making the outer bypass of the engine larger.

Judging from the size of the Kangchi engine alone, it doesn't look like it can reach 50 tons of thrust......

Is there something magical about this design of blades?

Dong Jun simulated this shape of blade in his mind, what was so special, but he still felt that this would not only fail to increase the air intake, but also lose a lot of air intake.

And that's not all that makes him strange,

Generally speaking, the engine test is a test of the core machine, but the Kangchi engine is even equipped with the shell.

And the shell of this engine is also very special.

Generally, the shell of the engine will be made relatively smooth and flat in order to reduce wind resistance, but the shell of this engine is like wearing striped clothes, as if the stripes of material were welded......

Not enough craftsmanship?

No, the process of the shell is much simpler than the core machine, and it makes no sense that even the shell can't be built, so the engine is built......

Except for the people of Datang Heavy Industries, all the people who see this engine for the first time now are as puzzled as Dong Jun.

"Mr. Kang, you engine...... Can it really reach 50 tons of thrust? Finally, someone couldn't help but ask, "It looks smaller than the turbofan 20, right?" ”

Kang Chi looked at Cai Yaobin, who was the first to ask the question, and nodded: "At present, the diameter of the entire engine is 4.4 meters, which is 0.2 meters smaller than the turbofan 20, but it can definitely burst out more than 50 tons of thrust. ”

"More than 50 tons?"

"Extreme thrust."

"Oh......"

The so-called ultimate thrust is the limit when the maximum throttle limit is lifted, without considering the life of the engine at all.

This is the same as CPU overclocking, although the maximum frequency of the CPU may only be 4GHZ, but directly increase the voltage, and may even be overclocked to 5-6GHZ, and in this extreme overclocking state, although the performance is higher, but the stability is sharply reduced, and the CPU may be burned out at any time.

Even if it doesn't burn out, it will greatly reduce its service life.

In the ground bench test of GE90-115B, the maximum thrust of 56.9 tons obtained belongs to the ultimate thrust, but in fact, it can be seen from the model parameters of its 115B that its maximum thrust under normal conditions is actually 11500IBF, which is converted into KGF is 52.16, which is often said to be 52 tons of thrust.

Although Kangchi's expression was full of confidence, the people on the scene were still a little unconvinced, and when Yan Hui and they began to load the engine on the test bench and make preparations before the test, Cai Yaobin asked Kangchi about why the engine design was so strange.

In order to leave a suspense for the test, Kangchi just smiled and said that he would know when the test was done, which made their hearts itch suddenly.

The reason why Kangchi came to the Eagle test flight base to test the engine is mainly to use the wind tunnel here, and only in the case of a wind tunnel can the performance of the engine at different speeds be tested more realistically.

If you find a random open space, the speed of air replenishment in front of the engine may be far from keeping up with the speed of engine inhalation, and the measured data will often be much lower.

Even more so for those engines that require supersonic flight.

Therefore, in the modern aviation industry, the wind tunnel is basically the pre-technology of aircraft design and manufacturing, and it is difficult to build a good aircraft without a wind tunnel.

The Wright brothers also conducted wind tunnel simulations before testing the world's first aircraft, which was powered by a twin-cylinder gas engine, and with the development of the aircraft, an axial wind tunnel that could simulate speeds of up to Mach 1.2 appeared.

Later, in order to meet the needs of higher speed aircraft, there was a compression wind tunnel that uses a compressor to press air into the air tank, which can simulate the air flow of up to Mach 5, and if a container is added downstream of the wind tunnel to inhale, it can even simulate the air flow of Mach 10.

The wind tunnel of the soaring test flight base is this kind of wind tunnel that blows up and sucks down, which is completely more than enough for this test.

However, if Kangchi comes up with a rotary detonation ramjet engine in the future, it may not be satisfied here.

You'll have to go to Huairou to find the JF22 Shock Wave Wind Tunnel, which can blow up to Mach 30 winds, and it is currently the strongest wind tunnel on the surface.

Sturdy and far ahead!

With the cooperation of the staff of the Soaring Wind Tunnel and the Kangchi team, the engine was quickly loaded onto the test platform, which was already equipped with various test instruments and pipelines.

Unlike the previous test engine, which was directly fixed on the test bench, this time according to the requirements put forward by Kangchi, they prepared a special test bench in advance, which is like a gantry, which hangs the engine upside down and is closer to the state of the engine mounted on the wing.

Soon after, Yan Hui, who was wearing a light blue overalls, took a document and handed it to Kang Chi and said: "Mr. Kang, the pre-test preparations for the turbofan 30 engine have all been completed, and the test can start at any time." ”

Kang Chi took the document, signed his name on it and returned it to him, and then said to everyone at the scene: "The official test is about to begin, please move to the control room." ”

(End of chapter)