Super military empire

"Where did you come from this technology? If it is just our own research, it is impossible to get it in such a short period of a few years, right? The variable-wing system is not a simple project!" Source, Liu Yijiu is really interested.

The Republic’s research on variable wing systems can be traced back to the 1960s, but there has been no breakthrough in the past two decades.

It is precisely because of this reason that the variable swept-wing fighter developed by Hongdu Aircraft Factory, the only domestic attack aircraft manufacturer-Qiangsix dismounted!

This is a technical problem that the Republic did not solve in the 1980s.

It can't be solved by the kind people and others!

When Zhu Hodao heard Liu Yijiu's question, he couldn't help but stop talking.

"Let's say, no matter where the technology comes from, I will not pursue it." Perhaps the source of these technologies is somewhat sensitive.

Hearing Liu Yijiu’s guarantee, Zhu Houdao said, “During the improvement process, we have had a lot of exchanges with the comrades of Hongdu Aircraft Factory. They have experience in the design of attack aircraft, and they were also acquired by the country more than ten years ago. After the MiG-23mc, Comrade Lu Xiaopeng, the chief designer of Qiang-5, began preparations for this. In 1980, the third-level subordinates assigned the task of developing Qiang-6..."

Hongdu Aircraft Factory is actually the Nanchang Aircraft Factory. This aircraft factory is considered to be one of the earliest aircraft factories in the Republic. Moreover, Qiangwu is also the first independently developed jet attack aircraft in the Republic.Liu Yijiu didn't contact the aircraft factory that had a mission.

In the mid-1950s, China and Egypt established diplomatic relations, and the relationship between Egypt and the Soviet Union was very good.It has always been equipped with a large number of Soviet weapons and equipment.

Egypt was the first Arab country to support the cause of Pakistan. When the Pakistan Liberation Organization was established, it received support from Egypt.

Although the current relationship between the two parties has not been restored because of the peace talks between Egypt and Israel, with such a relationship in it, the relationship between China and Egypt has never been too bad.In the 1960s, Egypt broke away from the Soviet camp and joined the Western camp. At that time, China used a batch of weapons and equipment in exchange for several MiG-23mc fighters from Egypt, thus starting China's research on variable swept wings.

Liu Yijiu knew this.

But he doesn't believe that there will be results now.

If there is a breakthrough now, the strong six will not be discontinued in the late 1980s.

After all, the main reason for the strong six to dismount is because the variable wing-sweep mechanism is 12% heavier than the MiG-23, which makes the ammunition and fuel capacity of the original small, and also seriously affects the combat radius and fighter aircraft. Flexibility.Another problem is the control system of the variable wing swept mechanism.

These systems are definitely not problems that can be solved by imitation.

"We exchanged with them the control technology of the variable wing-sweep mechanism. In this aspect of technology, we have cooperated a lot, and after having the f14 technology for reference, this is very useful for their research. Great promotion..." Zhu Hodao is still a little worried that Director Liu will get angry.

What he didn't expect was that Liu Yijiu did not get angry, but nodded, which made him relieved.

Although he wanted to ask Liu Yijiu that he didn't get angry, he finally resisted it.

"In terms of technology, no single unit can solve it independently. It is a good thing to be able to cooperate with brother units. We communicate with each other and make progress together. Shantouism is undesirable!" Liu Yijiu's words were resolved. Contradictions in the hearts of all kind.

Although this sounds good, most of the good things in the Ninth Academy are kept by themselves. There is no such thing as mutual exchange and common progress as Liu Yijiu said.

What the Ninth Institute mainly does is technical output and standard output.

The impact on domestic units is very large.

The technology of Hongdu Aircraft Factory is more useful to them, but their control system is even more important for Hongdu Factory.

According to the previous practice, they naturally had to buy it with money.

However, although the Hongdu Factory now has the task of developing a strong six fighter, it does not have too much funds to purchase technology from the Ninth Academy.

"The technology of variable-sweeping wing aircraft is complicated and requires more time and energy to research. We can get technology from our brothers and develop our own technology from them. Such a model should be promoted, of course, cost The problem must be considered..." After Liu Yijiu spoke to the other people, there was nothing more to say.

The F14 has been disassembled and assembled for an unknown number of times, and the engine has been disassembled.

Both engines are just lying on the workbench.

From the outside, there is no way to see the internal structure of these engines.

After all, this is assembled layer by layer.

"In the maintenance department, our people are replacing parts of the engine. Director Liu, you can see it over there..." Qi Hai knew that Liu Yijiu wanted to see the engine. The one in front of him has been repaired. If you disassemble it again , It will waste a lot of working hours."

"Let's take a look." Liu Yijiu also knew that he must understand the internal structure of the engine to see where the technical failure occurred and what caused it.

"According to our failure analysis, the main reason is that the fan in the high-pressure zone is not strong enough. On the other hand, the lubrication is not in place, which causes the throttle to be too large or too small, which instantly changes the fuel inside the engine combustion chamber..." Qi Hai said He walked to the maintenance department next to Liu Yijiu, and introduced to Liu Yijiu.

Others are confused about professional things, but Liu Yijiu is very serious about it.

For convenience, a workshop for repairing the engine was specially built next to the shutdown room.

This workshop was built for the turbofan eight.

The workshop is small, less than two hundred square meters. When Liu Yijiu arrived, there were more than a dozen technicians in the work clothes of the Ninth Academy.

The turbofan discs at all levels were disassembled, and the silver-gray parts were polished very smoothly, reflecting the surrounding images faintly under the light.

If you only look at the surface and don’t know the inside story, you will definitely be amazed by the Republic’s manufacturing process.

Liu Yijiu did not speak. Many turbofan disks of the entire engine were disassembled and inspected carefully. The cracked turbofan disk was put aside separately. Liu Yijiu took it forward and found it in the staff’s With help, I observed the cracked turbofan disk.

"This phenomenon did not happen when the engine was tested on the ground platform?" Liu Yijiu saw that the smaller the diameter of the turbine discs, the more obvious the root cracks of the smaller blades.

Obviously the strength is not enough!

Since the intensity is not enough, why did you discover it at this time?

Or find out why it will continue?

This is installed on an aerial platform, and an F14 is worth 80 million US dollars!

Qi Hai would not fail to understand such a thing.

Therefore, there must be something inside.

"During the ground platform experiment, we did not find this problem. According to the design requirements, our engine needs a minimum service life of more than 4,000 hours. There is no problem after 6,000 hours of continuous operation on the platform. It is precisely because of this that we Only then are we going to use the aerial platform for testing. As long as there is no problem on the aerial platform, this can provide us with the Panda fighter and the Double Triple Project..." Qi Hai sighed.

He also didn't understand where the problem was.

He has followed since the production of the first engine prototype.

"The strength is not enough, we have calculated it, but if the strength is not enough, it can be found on the ground platform..."

Liu Yijiu listened patiently.

At the end, ask if there is a new impeller for replacement.

A comparison with the new impeller may be able to find the problem.

Qi Hai also told Liu Yijiu that they compared countless times. When it was not installed, they even installed it on the ground for experiments. Once installed on the plane, problems would arise.

At first, I thought that there was a problem with the oil circuit or the control system. These were the results of numerous technical analysis and improvement work.

Had it not been for the pilot to risk his life and use the control wing to control the gliding back to the airport, this f14 would be expensive for testing and would have fallen.

"Perhaps the problem lies in the processing." After comparing, Liu Yijiu found that all the tops of the impellers were polished manually.

"It shouldn't be! We thought about this problem at the beginning. In the end we improved it, but it's still the same. As long as the afterburner is not used, there is no problem..."

"When the afterburner is turned on, the temperature is higher and the pressure is higher. This requires higher materials. Don’t you know? When grinding, the traces on the roots are obviously inconsistent. Old Qi, don’t you find that these impellers , Are there any rules for root cracks?” Liu Yijiu said, pointing to the very subtle cracks on it.

On the impeller held by the worker next to him, there were three blades with a crack thinner than hair at the roots.

These cracks are not evenly distributed along the direction of the root, showing irregular marks.

"But we all use the top nine level fitter for polishing..."

"Our level 9 fitter has never been in contact with the processing of such precision special-shaped parts before. The Americans use CNC machine tools to manufacture such engine parts, and they are special CNC machine tools with very high precision. The Soviet Union uses special machines. , And we use labor. Dozens of blades must be kept the same in any position. Do you think our workers can do this?" It’s not that Liu Yijiu does not believe in domestic skilled workers.

But the requirements for workers are too high!