Putting down the phone, several people were happy and sad, and everyone heard it during the call, and the German side made it clear on the phone: it can provide low-interest or even interest-free loans, but the additional conditions are a bit painful.

Director Bai couldn't make up his mind for a while: "Let's listen to your opinions, Germany requires at least 40 percent of the development of new engines to give us an interest-free loan of 200 million US dollars, and now this loan will be a little hot." ”

In the original plan, although the base needs the MTU company to undertake some tasks, but it is only 20 percent, and now the MTU company wants to get 40 percent of the share, which means that the base has to give up a large part of the share, the more Director Bai thinks about it, the more he feels a little lost, but Yang Hui does not think so.

MTU has to take 40 percent of the share, and as a shared risk project, it means that MTU also has to take 40 percent of the risk, so that the risk borne by the base is much smaller.

"Director, if you want to say that MTU wants a 40% share, I think we can give them, and even the cold end parts of the engine can be borne by MT, we just need to focus on the development of the core."

The core machine project is a good thing, Yang Hui said that I don't know how many times, the core machine is not only useful in military engines, but also in civilian engines, and even a core machine can be used for both military and civilian purposes.

Borrowing money from the Germans to develop an advanced core machine will not feel a loss no matter how you think about it, and at the same time, it is more in line with the respective strengths of the base and MTU.

Cold-end components such as low-pressure compressors, fans, external channel casings, low-pressure turbines, etc. MTU is more than capable of doing the job.

It's not that these things don't have technical content, it's just that these things can't be taken out of qualified civilian types at the base now, and it's more appropriate to hand them over to MTU. MTU has participated in the development of many types of commercial large-channel ratio engines, which can be trusted technically.

There was no need for Director Bai to speak, Chief Designer Wen, who was in charge of engine design, first comprehended the essence of Yang Hui's thoughts.

"I probably understand what you mean, it's going to adopt the CFM56 engine development model on the new engine, with the core engine provided by us and all the components except the core engine provided by MTU, right?"

That's right, what Yang Hui wants to propose is the cooperation model adopted by GM and Snecma on the CFM56 engine. The CFM56 engine successfully developed in this mode has been studied by countless people in later generations to study the road to the CFM56 engine, and finally summarized it. This is called the CFM56 equation.

Now no one is too idle to summarize these, but Yang Hui came to know these in later generations, and Yang Hui naturally wants to learn from the successful experience of others.

With the country reopened. Domestic information is also gradually in line with international standards. We also know several well-known successful cases of cooperative development in aero engines, and CFM is one of them.

However, what Yang Hui said was not enough, and Director Bai felt that there was one more thing to add: "Yes, the plan you said is very good, and I also think it is quite feasible." We develop the core machine, and leave the rest to the MTU, so that we can meet the German demand that the MTU company occupy at least 40 percent of the share, and at the same time, we can also take into account the expansion of the military aspect from the beginning when developing the core machine. ”

Speaking of this, Director Bai stopped wittily. That's all it takes, and everyone understands the second half of the sentence. According to the plan proposed by Director Bai just now, it is a typical combination of military and civilian, military and civilian dual-use.

Chief Designer Wen and Chief Engineer Yang are already eager to try, an advanced dual-use core machine, which is an irresistible temptation.

"There is no problem at all, we have been drooling for a long time with an advanced core machine, and now our turbofan 10 core machine uses such as annular combustion chamber, directional solidification without margin precision casting composite cooling hollow turbine blade technology, which has greatly improved the total temperature of the combustion chamber and turbine, but the compressor is still a big loophole."

The turbofan 10 core engine is derived from the improvement of the turbojet 13, which has made great progress, but the original design of the five-stage high-pressure compressor does seem to be somewhat insufficient, and the five-stage compressor is two less than the seven-stage high-pressure compressor of the F404.

This means that the improvement space of the turbofan 10 will be very limited, and the F404 can be improved to the F414, but it will take a lot of effort to change the thrust of the turbofan 10 to the F414 level, and the high-pressure compressor is a big problem.

If the turbofan 10 wants to increase the thrust again, it can only increase the channel ratio to death, and the channel ratio continues to increase, and the high-altitude performance will continue to decrease, and the turbofan 10 as a military engine has no room for additional thrust.

Yang Hui has long known this, and now according to Director Bai, the development of a new core machine, then you can improve the high-pressure compressor on the basis of the turbofan 10 core machine, and it is feasible to change it to a seven-stage and eight-level high-pressure compressor, and if you need a new medium thrust greater than the turbofan 10 thrust in the future, you can directly use the new core machine.

Using the funds provided by Germany, under the banner of participating in the development of a new commercial engine, to develop a dual-use core machine, even if the Germans saw it, there was no way.

Germany's existing technology to engage in such a thing as a core machine, it can only be said that this is still a little difficult, and the development of the core machine requires a long period of accumulation, especially high-temperature turbine materials, which Germany really does not have.

The defeat in World War II caused Germany to lose too much in the aviation industry, and it is still a partial department, and the manufacture of the core aircraft is still the patent of the five hooligans, and Germany needs to work harder to join in.

Negotiated a feasible plan, the four of them are satisfied, now need to wait for the MTU company to come to the base to discuss cooperation, although the base is now responsible for the development of the core machine, but some places still need to get the support of the German side.

Germany's machining technology is absolutely enviable, in the core of manufacturing, if the accuracy can reach the international level, the efficiency of the compressor will be greatly improved.

Although some other technologies can compensate for the lack of precision in compressor manufacturing, it is very contradictory that other solutions will increase the complexity of the structure and increase the weight.

"Okay, then let's settle it now, the MTU side will not arrive until next month, we will wait now, but in order to make the MTU company not underestimate us, we need to prepare and show some strength for the German side to see."

Yang Hui has seen the changes of MBB company all the way in Xifei, after watching the first flight of the bombing oil six, MBB is completely changed, if you want to shock the opponent, you still need to come up with reliable technical strength.

This method has been used by Xifei once, Yang Hui doesn't mind pursuing the doctrine of taking, learning from Xifei to also come up with something, the key is to capture the MTU first, as for what technology to come up with, this is also particular.

As the backbone of the country's military industrial unit, a lot of things are secret, at least the high-temperature turbine technology in the institute can not be taken out to the Germans to see, directional solidification without margin precision casting composite cooling hollow blades are just taken off by the material and retreated, if the directional solidification material can be upgraded again, the turbine temperature will definitely go up to a higher level.

These can't be taken out, then we need to come up with another technology, preferably the technology that the army has not yet recorded, Yang Hui thought left and right, and did not think of any technology that could meet the needs.

Walking out of Director Bai's office, Yang Hui was still searching in his mind for what technology he could have, which could show the strength of the base and be relatively safe.

Thinking about it carefully, Yang Hui was completely unresponsive to his surroundings until

"Alas, Yang Group, you're back! It's really rare to see you, come on, the good thing you got back from the United States last time, a few of us are still a little confused, but it's really a good thing. ”

Yang Hui, who was taken aback, found out that it was Zhong Jianjian, who seemed to be living a very fulfilling life, holding a large stack of materials in his hand, which was still in the English version. (To be continued......)