Back then, what an urgent task it was to survey and map the imitation of the MiG-21MF! Because the MiG-21MF at that time was the expectation that the domestic air force would have all-weather combat capability.

Compared with the domestic J-7, this aircraft has an increased nose and a radar inside, and has the ability to fight all-weather, which was also urgently needed by the Air Force at that time.

The Air Force is in a hurry, not to mention the scale of hundreds of planes, but what?

But then, the Air Force was out of demand?

The needs of the Air Force are constantly changing, and at the beginning, Tu Lao wanted to paint a scoop according to the gourd, which was such a worry, once it dragged on for a long time, there might be changes.

The needs of the Air Force are fickle.

It's like the introduction of Marconi's avionics, such an important and urgent project, urged every day, the result? Don't.

Tu Lao has already experienced it and knows this deeply, in fact, Song Lao also knows that he just wants to really understand, eat thoroughly, and not do that kind of half-baked thing.

This kind of thing, no one is right or wrong, it is a matter of different routes, and Song Lao's progress is also very fast, and the design will be completed in about a year.

However, they have a big problem, and that is the engine!

The air intake cone of the MiG-21MF has become thicker, the body has become heavier, and the back ridge has increased, in this case, its dead weight has increased, and the original turbojet-7 cannot be pushed, and the new turbojet-13 must be copied by surveying and mapping.

But this kind of engine, if it can't be imitated for a long time, and if the engine doesn't come out, then there is no way to coordinate production, and even test flights can't be done.

They are still waiting.

After waiting for a few years, the situation has changed a lot.

J-8 2, in the active search for a new fire control system, to achieve a perfect interception capability, and J-7, the improvement is also constantly underway, especially the current J-7 CP project, by modifying the nose, has a perfect over-the-horizon attack capability premise, it is definitely better than the MiG-21MF.

Even the Air Force is eyeing this super seven project, in this case, what room does the J-7 3 have to survive?

No one will like this kind of aircraft anymore, the thick fuselage, which leads to a decrease in maneuverability, and finally only obtains a rudimentary radar in front, and the entire aircraft is already completely backward, and the Air Force can no longer look at it.

General Lin said that in those days, if it could be built immediately, the Air Force would definitely buy a large number of them, but now that a few years have passed, for the Air Force, the once advanced is no longer available, and now it has become outdated.

The Air Force doesn't need this kind of thing anymore.

However, the Air Force will not completely resist, after all, for this project, the Air Force has invested a lot in the early stage, and a lot of fuselages have been built, just waiting for the final assembly, if these materials are not used, it will be wasted, so, these will definitely be used, but, that's all, if you look at it this way, at most, it is only the scale of thirty planes, the scale of hundreds of planes before, that is impossible.

Song Lao was also very helpless, and spent a lot of effort, and in the end this was the end, but he also knew that the choice of the Air Force was justified by them, and now Song Lao also needed to take his eyes off the Jian-7 3 and devote himself to the No. 10 project.

After all, they still learned a lot from the mapping and imitation of the MiG-21MF, this is the first time they have completed the whole process of the aircraft, for the team of the 611 Institute, it is a very rare accumulation of experience.

Qin Feng listened to Song Lao's narration, at this time, he had already finished eating, his mood was heavy, for his own side, it was too slow, the last time he went to Guizhou, he and Song Lao went to see the mapping and imitation of the engine, and knew all the difficulties faced, as for now, Qin Feng has a profound experience.

"What about Vortex-13, how far is it going now?" Qin Feng asked.

The thrust of the turbojet-13 is greater than that of the turbojet-7, even if the J-73 project ends without a hitch, the turbojet-13 project will continue.

It has a lot to do with it.

For example, the J-7 CP project led by Tu Lao, a cooperation project with Pakistan, is intended to use advanced turbofan engines such as the Western F404, but at the same time, if the desire to introduce them from abroad fails, then they also have a backup plan, which is this turbojet-13 engine.

Although the thrust can't be compared with the F404, the fuel consumption and the like are much worse, but after all, this is something that you can take out and use, and this will not be stuck.

Moreover, the J-8 can also be replaced with this kind of engine, if it is replaced, the thrust increases, it will definitely be conducive to the further improvement of the fighter.

Hearing Qin Feng's question, Song Lao on the side said: "This engine, we have already copied it, and now we are conducting high-altitude platform simulation experiments in the capital, if you want to see it, when we finish the meeting, go over and take a look." ”

A qualified engine is to go through a series of formal testing processes, the first is to conduct experiments on the ground test bench, and this high-altitude platform is a kind of ground test platform, but its air pressure, etc., are simulated high-altitude to test the operation performance of the engine in high-altitude conditions.

If it cannot ensure stable operation on the high-altitude platform, it is impossible to install and test flight, which is a scientific experimental process.

Qin Feng nodded: "I really want to go and see." ”

When I was in Guizhou, I was still exploring the casting of blades on the turbine, this kind of progress is not guaranteed at all, maybe it can break through in a few days, or it may not be able to find the right way for a few months, but fortunately, I finally got it out. The engine is the heart of the aircraft, and it has always been the weakest in this regard, and if there is no qualified engine, there will be no qualified fighter.

"Let's take a look." General Lin spoke on the side, and sure enough, he was also very interested in this engine, and he couldn't wait to complete the development of this engine as soon as possible.

After returning from the European investigation, Qin Feng still did not breathe, in the face of the threat of the French, the domestic aviation industry began to continue to move forward, and Qin Feng is constantly forging ahead in the general environment.

After a three-day meeting in the capital, Qin Feng and General Lin went to the branch of the Gas Turbine Research Institute in the capital, where there was a large high-altitude test bench, and the turbojet-13 engine was transported here for test run after it was assembled from Guizhou.

"After visiting here, you will go back to the test flight institute first, I have a small gift, which is for the little tiger head." In the car, General Lin said.

"Bang." At this moment, suddenly there was a loud noise in the distance.