The situation of the 4020 factory is very bad, so it is natural to have to find various ways to survive, and thousands of people up and down the factory have to eat, drink and Lazar, and the country's annual relief allocation is special = definitely not enough to support the needs, so 4020 has come to Xifei, which has nothing to do with them.

And the reason why Yang Hui was able to meet the leaders of the 4020 factory here is even more interesting. At that time, the 4020 factory also copied the existence of the JT3D engine, although this engine is a little old, but the thrust is enough, the basic model is 7.7 tons, and the improved model is as high as 8.6 tons.

This kind of turbofan engine finalized in the United States in the early 60s has performed well in many years of use, and the 4020 factory has also spent a lot of effort on this engine, although it was finally dismounted, but the technical level is still within reach of the current 4020 factory.

This is why the 4020 factory heard about the selection of the MPC-75 regional airliner when it was careful, and came to Xifei with the mentality of giving it a try, hoping to sell this time-tested engine.

The final result is naturally very sad, although this proactive mentality is very good, but the technology of this engine is too large, and Xifei didn't even bother to listen to them in detail about the turbofan 8 engine.

However, Yang Hui later talked for a long time with the deputy director of the 4020 factory, as for what he talked about, there is no need to say in detail, after all, this is just a ridiculous idea, and now Southwest Science and Industry is facing two other strong opponents, it is not an exaggeration to say that it is difficult to protect itself

Just after Yang Hui left, the two teams with GM and Rollo as the main force submitted their respective projects to the review team. It can be seen that these two parties are not very calm, after all, it is the selection of new aircraft engines of this level. Everyone is the eldest brother and the second brother, and the three engines can actually be regarded as completely new research and development.

Even the engine that has always advertised itself as a mature product is universal. My family knows their own business, and the highest thrust model 34-2 in the previous CF34 series engine is just 5 tons, and the huge gap between 5 tons and 7.5 tons is not so easy to improve.

The reason why GM said that it was an improvement on the CF34 was mainly to take advantage of the good reputation of the engine that was finalized and delivered in 82 years.

When it came time to report the engine development to Xifei-MBB, the project progress was only less than 20 percent faster than the progress of Southwest Science and Industry, and only 10 percent faster than that of RB715.

Therefore, the data of these three engines was placed in front of the evaluation team. Even this evaluation team was a little hesitant, and the progress of these three engines did not open too much, and at this time it was necessary to consider the performance of the engine.

The first comparison is the fuel consumption of the three engines, which is related to the operating costs, range and so on of the MPC-75 installed in the future

The most dazzling fuel consumption data of these three engines is the CG-2000 engine, no way, with the existence of the gear reducer, fuel consumption is not too far behind the three-rotor engine, just 0.575 cruising fuel consumption is much lower than the other two engines given by 0.586 and 0.591.

Although it seems that there is only a difference of about 0.012 on the surface, it is not enough to hold this unit too small. It's all KG/(DAN. H), which means: the amount of fuel required for every 1 DAN (1 kilogram) of thrust produced by the engine in an hour while cruising in the air.

At this time, you can see the gap when you actually bring the data in, and the seemingly small 0.012 is more intuitive to convert. When the two engines are cruising in the air, they can save about 144 kg of fuel per hour of flight.

Although the oil used in the aircraft fluctuates with the international oil price, it still has to be 7,000 yuan a ton. Saving 144kg of fuel per hour means saving 1,000 yuan.

Using the MPOC-75 engine of CG-2000, you can save 1000 yuan per hour. If the flight life of an aircraft is 60,000 hours, then the aircraft can save 60 million yuan during the entire flight life. This is a large number, and there is no room for civil aviation companies not to be careful about the fuel consumption of aircraft.

These indicators that are closely watched by civil aviation companies are naturally also valued by aircraft and engine manufacturers, and now the performance of this special geared engine of Southwest Science and Industry is so good that the evaluation team has to pay close attention to this engine.

Seeing such excellent fuel consumption data for the CG-2000, the German MBB side couldn't sit still at first, this thing is simply a three-rotor design in a civilian medium-thrust turbofan engine.

As if he had discovered some remarkable treasure, Mundon, the person in charge of the MBB bidding for the engine project, almost jumped up and shouted.

"God's work, it's simply God's work, this engine's position in the medium-thrust large-bypass ratio turbofan engine, just like the RB211 back then, it is definitely a product that can bring a company in the trough to glory, at least for 20 years."

As soon as this remark came out, it also clearly showed the attitude of the person in charge of MBB, although this is only the personal attitude of the person in charge, but in many cases, the personal attitude of the leader is the most important point in the final decision of success or failure.

Just when MBB dropped its eyes on this engine, discordant voices would always appear at the most critical moments, which were some doubts in the hearts of the person in charge of Xifei.

Carefully looking at the information of this CG-2000 engine, as well as the engine entity on the side, the core machine looks quite like that, compared to the core of the other two engines, it is also half a catty, the only drawback is that it is still a little inferior in terms of life, but the difference is not too big.

The essence of the CG-200 engine lies in the gear transmission system, which is the key to its ability to achieve low fuel consumption, but there are still many doubts about the use of this new technology.

"Don't just look at the advantages of this engine, I think it has a lot of disadvantages. First of all, its life expectancy may be inferior to the other two engines, which will make this engine lose a lot of points; secondly, the R&D progress seems to be a little too slow; The most important point is that the company that developed this engine has no experience in developing a finished civilian turbofan engine, which will also add a lot of uncertainty to the future of this engine. ”

As the developer of the aircraft, Xifei naturally has to give more consideration to the engine, and in addition to the fact that Xifei and even the entire republic have suffered losses due to the slow progress of engine development and finally dragged down the entire aircraft, it is not surprising that Xifei is more conservative in the face of this hard-won opportunity.

Of course, this conservative consideration is not unreasonable, after raising these problems on the West Flying side, Mondon who was originally favored by the CG-2000 engine is also a little entangled, this engine does look very good, but the West Flying side is not unreasonable to worry.

After thinking about it for a long time, Mondon finally sighed, he didn't have too good ideas now, the advantages and disadvantages of the CG-2000 engine were obvious, and the entire MPC-75 project was also risky with this engine.

Not to mention the CG-2000 engine, if you want to talk about the other two engines, it seems that it is even more difficult to choose.

"The remaining two engines are actually similar, both are old aero engine manufacturers involved in the development, research and development risk is not too big, both engines are half a catty, it is difficult to win by a big score."

At this time, the evaluation team has a preliminary impression of the three engines, and it is the first time for Xifei to operate this kind of international bidding, and when it is difficult to make up its mind, it has set its sights on the next step of the bidding process.

"Otherwise, we will go directly to the next step of the process, call out all three parties, let them evaluate each other's engines, and examine these engines with their professional eyes among these competitors, which will definitely be more aware of the shortcomings of each other's engines than we are, which will help us to make a final reference." (To be continued.) )