Aero engines are the Everest of modern industry.

For many years in China, the fighter jets that can be stably produced are the turbojet-5 and turbojet-6, which are respectively J-5 and J-6.

That's right, even the turbojet-7 used by the J-7 is not very stable now, and it will take a few years before it will be able to eat all the processes and truly mature.

At present, the country's industrial base is very poor, and the aviation industry may want to rely on this opportunity to break through the level of domestic aero engines to the world's first-class in one fell swoop, but they ignore their own gap, in short, they are ambitious.

Even if it is the United States, the level of science and technology is already first-class, when working on the F100 engine, there are still so many technical problems, Qin Feng is very worried, if Song Lao pins the hope of the new engine on this so-called Taihang, he will definitely suffer.

You know, the development cycle of the engine is definitely longer than the aircraft, and now, the aircraft have begun to be developed, and the engine has not yet been established, in this case, there will definitely be a situation of fighters and other engines, not to mention anything else, the current Song Lao surveying and mapping imitation MiG-21MF J-7III, isn't it just waiting for the engine?

This engine, which is only equivalent to the current turbojet-7 facelift, is so difficult, how difficult should it be to completely develop a turbofan engine?

Even a technological powerhouse like France knows the difficulties, so when they made the engine for the Mirage 2000, it was a unique single-rotor engine, just to reduce the difficulty.

Qin Feng is on the side of General Lin in this regard, he feels that this so-called Taixing is too dangerous, maybe it will mature, but it will not mature in ten or eight years.

Of course, this is still a conservative estimate, and it took 30 years for Taihang to really mature.

Now, Qin Feng has also denied it, which makes Song Lao very strange, hasn't Qin Feng always been very supportive of new technologies? Just like those avionics, Qin Feng is very supportive, you know, the gap between his own side in avionics is not ordinarily big.

Qin Feng knows very well in his heart that avionics and engines are different, avionics is partial, as long as the electronic system progresses, and the engine, which is almost integral, is the embodiment of a country's overall industry, materials, technology, processing level, and even the quality of workers, as well as experience, this thing is not so easy to break through.

Many aircraft designers want to use turbofans, thinking about Taihang, among them there is a tragic Lu Lao, his strong six project, the superior investigated, asked him if he can pretend to be Spey, he is vetoed, to pretend to be Taihang.

As a result, the flying leopard pretending to be Sibei soared into the sky, waiting for the strong six who pretended to be too good to die.

"Okay, let's talk about the current Turbojet-15." Anyway, the current Taihang is still not a word, and it has not been officially approved at all, and at this stage, it has to rely on the turbojet-15.

If you look at the history, the establishment of the Taihang project has also experienced ups and downs, the experts in the aero engine have worked hard several times, and finally even after the complex letter of the old experts of the nature of the complaint, the higher-level old leaders realized the importance of the advanced turbofan engine, and the "Taihang" was officially approved in 1987, and was designated as the power system of the final mass production model of the new J. The Turbojet-15 was only used as a transitional engine for the test flight of the prototype stage of the new J.

In fact, the characteristics of turbojet and turbofan are not the same at all, if you first use turbojet to test flight, and then use turbofan to finalize, it will be a big modification, not even to mention the turbofan for turbojet, even if it is a turbofan for turbofan, it is not easy.

In later generations, in the nineties, the project of the new J was steadily unfolded, and they were in a state of waiting for the engine, and they were looking forward to the progress of the turbofan ten, and later, the superiors slapped the table, did not wait, and used the third uncle.

As a result, Song Lao and others are extremely resistant, this is definitely a layman leading an insider, can this engine be changed casually? They don't want to change, but the superiors are firm, the old general is to change, this change, almost brought about a large area of modification of the entire rear fuselage, however, this change, also successfully laid the take-off of the J-10, J-10 produced hundreds, and the turbofan 10 did not dare to use it.

"We already have some original R-29-300 turbojet engines purchased from abroad, and these engines can be installed and tested directly without waiting." Song Lao continued: "However, after all, unlike the MiG-23, after we get the engine, we also need to redesign and modify the components including the receiver accessories, and achieve the goals of expanding the envelope, increasing the bleed air, and increasing the fuel temperature through further improvements, so as to get close to the test flight needs of the new J. ”

It needs to be improved, and after it is improved, the number of that vortex-15A comes, of course, this is not Song Lao, it is made by the singer factory.

From a technical point of view, this is indeed quite reasonable, after all, there are only a few early test flight prototypes of a fighter, and the total number of engines needed is so much, and Egypt has dozens of MiG-23s and hundreds of R-29-300 engines, and it is no problem to sell a few to China for improvisation.

However, from the perspective of the product name, although this engine has indeed been changed, only such a small change has given a turbojet 15 to the name on the A, which has been criticized by countless military fans later.

After all, the Turbojet-15 that he copied has never appeared, and this project, like many projects, ended up being a failure.

In Song Lao's eyes, of course, he also wants to work hard to promote the current new annihilation project, and with General Zhang's affirmation, his own project will definitely be able to continue.

Outsourcing is outsourcing, self-research is self-development, and then outsourcing, you must also have your own things, Song Lao is confident.

"Old Song, recently, I may not be able to participate." Qin Feng said embarrassedly.

Song Lao nodded, although Qin Feng wants to join the new project, however, the initial bidding has ended, and the wind tunnel in the later stage is all boring data, which must be understood by the most professional people, Qin Feng joins or not, there is not much difference, and now Qin Feng, who is mainly engaged in foreign trade machines, is also very busy, in a word, it is all for revolutionary work.

"When Lao Tu's side is done, our side will also start, and when the time comes, you can come and help." Song Lao said: "When the time comes, there will be Tingting, and she will also be invited in, she is now engaged in stabilization, relying on the experience of that project, it will be of great benefit to our digital telex research and development." ”