After a few minutes of silence, Grigorievich spoke first: "I see, but I still have a question. Pen "Fun" Pavilion www.biquge.info"

"Just ask," Chen Geng said, "No matter what you want, I know everything and say everything." ”

Grigorievich asked: "Well, why do you want to improve the NK-8 since your company has already obtained the technology of NK-44 and NK-56?" ”

"And I came up with two plans at one time," Vlasievich said: "Especially the one with a duct ratio of 3 to 4, although there are no detailed technical index requirements, but the overall performance index that comes out in the end should be about ...... NK-44."

So, with NK-44, why do you have to do such a thankless job? It's a waste of money!

Chen Geng thought for a while and did not answer directly, but asked Vlasievich: "Mr. Vlasievich, I have a question: NK-44 and NK-56 engines, what step has the Kuznetsov Design Bureau done?" Have you already done all the design work and are just waiting to start building the original prototype, or are you not even ready to complete the design work? ”

The Kuznetsov Design Bureau has already begun to hand over the original design data of the NK-44 and NK-56 engines to Runhua Industry, so there is nothing to be ambiguous about this issue, and Vlasievich immediately said: "Most of the design work has been completed, and the remaining part is expected to be completed within a year......

"That is, the paper work has not been completed yet," without waiting for Vlasievich to finish speaking, Chen Geng nodded: "Considering the technical and financial risks during the research and development period, Mr. Vlasievich, from now on, without considering the premise of the diplomatic and policy influence of the two countries, how long do you think we can produce the prototype and complete the test flight work required for the airworthiness certification of the engine?" After obtaining the airworthiness licenses of the USSR and China, how long does it take to get the airworthiness licenses of European countries and the United States? ”

"......" Vlasievich was completely stunned, he really didn't think about it.

Grigorievich's reaction didn't have to be any better for Vlasievich.

Only then did the two realize a very important issue: time.

In 1969, the French government in the civil aviation market after the research, put forward the research and development of the maximum thrust in the 100KN level of turbofan engine subject, with the support of the French government, Snecma in 1971 and the United States General Dynamics reached a strategic cooperation agreement, decided to the United States F101 military turbofan engine based on the core engine, the development of a type to meet the needs of civil aviation in the 80s, low fuel consumption, low noise, low pollution, High reliability of large bypass ratio civil turbofan engines.

From 1971, when the French company Snecma established a partnership with General Dynamics of the United States, the design was completed and the prototype began in February 1972. And in September 1974, the two parties officially formed CFM International.

Because the core engine uses the core engine of the F101 military turbofan engine that has been used by the US military for many years, it is mature and reliable, so the whole research and development process is very smooth, but even so, CFM International's first product: CFM56-2 engine has finally obtained the airworthiness certificate of the United States and France.

From 1971, when the French company Snecma and General Dynamics of the United States formally signed a cooperation agreement, to November 1979, when the first engine officially obtained the airworthiness certificate, it was used for a full 8 years, during which the research and development cost exceeded 1 billion US dollars!

Runhua Industry has great ambitions, they hope that the NK-44 and NK-56 produced in the future can participate in international competition, it is necessary to obtain airworthiness licenses from European and American countries, so calculated, even the most ideal and smooth situation, from now on I am afraid it will take at least 10 years, if the Americans, Europeans do not want the Chinese to come in, in the process of airworthiness certification to give you a little bad, 15 years or even 20 years will not be able to get the airworthiness license is not impossible.

The premise of all this is that the whole development process is smooth sailing, what if there are any accidents in the development process? Who can control the time of the whole R&D process? Could it be that before a better engine is dragged into use, Runhua Industrial can only use NK-8 with a bypass ratio of 1.02?

From research and development to the formal market, there are too many uncontrollable factors during this period, no one knows how long it will take NK-44 and NK-56 to really put into use, and there are many unusable factors, which means that the risk is large, if there can be a replacement before NK-44 and NK-56 are officially put into use, everything will be much more controllable, and the two NK-8 that Runhua Industry requires to be improved are the substitutes for NK-44 and NK-56 before they are officially put into use.

"I see what you mean," Vlasievich nodded, and shook his head again: "I don't know if your decision is correct, although it does sound reasonable, but I need to remind you that even if it is based on NK-8, it will take three or four years to complete the entire development process, so ......"

"Three or four years? It doesn't matter," Chen Geng asked, "I'm more concerned about whether you can come up with what I want in three or four years than this?" ”

Vlasievich and Grigorievich looked at each other, and they both laughed in unison......

Grigorievich: "Mr. Chen, you must know that the NK-8-6 is the only aero engine in the world with a bypass ratio of 1.5 but a thrust of up to 127 KN. ”

"That's right," Vlasievich followed, "the Kuznetsov Design Bureau began to develop NK-8 in the late 50s, and it has been more than 30 years now. ”

What is self-confidence?

What does it mean to be domineering?

That's it!

No matter who it is, if he can immerse himself in a product for more than 30 years, he can also have this domineering, and he can also have this "What do you want?" Lao Tzu can already play with this engine", for the Kuznetsov Design Bureau, which has developed a number of derivative models based on the NK-8, they even made a freak like the NK-144 with the rear afterburner, so ...... Is Chen Geng's request still a problem?

"So, in this case, what do you think the performance of this engine can achieve if the bypass ratio is 4?" Chen Geng thought for a moment and asked.

"Bypass ratio to 4?" Vlasievich pondered for a moment and replied with confidence: "Although there is no way to answer your more accurate data, I think the maximum thrust of 160KN is absolutely fine." ”

"Yes," Grigorievich followed, "if you don't go too far in terms of maximum thrust, we can make more tilt in terms of engine life, fuel consumption, and by Soviet standards, we can achieve a cruising fuel consumption of about 0.63." ”

Chen Geng: "......"

Well, the cruising fuel consumption rate of 0.63, although it is the cruising fuel consumption rate of the Soviet standard, I don't know what it is if it is converted to European and American standards, but if you think about it, 0.7 can definitely be guaranteed, what is the cruising fuel consumption of the famous CFM56 series? It's only between 0.6 and 0.69......

Rub it!

Without comparison, he didn't realize it, but after such a comparison, Chen Geng suddenly found that this number was already so terrifying: doesn't that mean that after a series of improvements, NK-8, which has a bypass ratio of 4, is incomparably different from products with the same thrust in Europe and the United States in terms of core technical indicators?

Although he knew that after reaching these figures, he would definitely have to sacrifice in other aspects, but Chen Geng was still shocked by Lao Maozi's original design on this engine: Do you want to be so cruel? NK-8 is a product of the late 50s and early 60s.

“OK……”

Chen Geng pondered and said slowly: "Mr. Grigorievich, Mr. Vlasievich, if you two are put in charge of this project alone, can you complete these two projects within 3 years?" ”

"Let's take care of the two?"

Grigorievich and Vlasievich didn't expect that Chen Geng actually planned to hand over such an important task to the two of them, and they looked at each other for a while, and after a long time, the two asked cautiously: "Are you serious?" ”

"Of course it's true, you think I'm going to joke about this kind of thing?" Chen Geng asked rhetorically.

"Uh......"

Indeed, Chen Geng didn't have a reason to joke with himself about such a big thing, so is it true?

Such an important R&D task fell on the two of them as if it were a joke, and Vlasievich and Grigorievich felt like a dream.

Chen Geng continued: "If you think you can undertake this task, your salary will immediately follow the chief designer and chief engineer, I guarantee that your annual income will be more than 200,000 US dollars, and there will be a super red envelope after the project is completed, but there is one requirement." ”

"What requirements?" As soon as Chen Geng's voice fell, the two of them asked.

"You have to take students," Chen Geng said: "In the process of research and development, there will be people from our Runhua Industry to join your team, and you must train them, and as a reward for you, I can give you some relaxation in terms of time." ”

With such favorable conditions, what is there to hesitate about? The two looked at each other and nodded in unison: "No problem, we agreed!" ”