"What? You want the turbofan-9 to be used on the Yun 10? Isn't the progress of the turbofan-8 similar to that of the turbofan-9?" Du Shengfeng was a little puzzled.

Military engines are completely different from civilian engines.

Yun 10 above, not suitable for military bass engines at all.

"No, Yun Ten, we are still ready to use the turbofan eight. We now have a new military fighter project, and we need a military engine like the bass engine......" Zheng said.

His words made Du Shengfeng frown.

"The imitation of the bass engine, because the British did not give the technical development manuscript and did not provide designer consulting business, has been very slow. Du Shengfeng has a very clear understanding of their unit technology projects.

The bass engine has introduced a full set of technical drawings and production processes from the United Kingdom, and it is difficult to digest and complete.

"Didn't anyone in our country ever work for Rolls-Royce Engines, and their bass engines were designed and developed based on his theory?" Xie Kai asked.

In the early 50s, Wu Zhonghua published a paper on "The Universal Theory of Ternary Flow in Axial, Radial and Mixed-flow Subsonic and Supersonic Turbomachinery", which is internationally known as "Wu's General Theory" and is widely used in the design of advanced engines.

Wu Zhonghua has not received much attention in China, and this old man doesn't seem to have lived for a few years.

If the imitation of the bass engine had been involved in the work of Mr. Wu Zhonghua, it would definitely not be the current situation.

During the negotiations that year, the British side did not give too much difficulty because of the final participation of Mr. Wu Zhonghua.

In the seventies, China introduced bass engines, which cost more than half a billion pounds!

Half a billion pounds, how much is that?

Especially the five hundred million pounds in the seventies.

"You said Old Man Wu?" Du Shengfeng looked at Xie Kai, a little embarrassed.

Zheng Yucheng didn't know who the old man Wu was in the mouth of the two people, but he knew that none of the people Xie Kai said were not professional experts.

"Yes. Mr. Wu used to work for Rolls-Royce Engine Company, and he played a big role in the introduction of bass engines, right? Even the British call him a teacher!" Xie Kai nodded and said.

"Old man Wu doesn't have time to do this ......" Du Shengfeng's eyes were a little dodgy.

Zheng Yucheng was puzzled, but Xie Kai was clear.

History is always so cruel.

"We want to know the specifics. Xie Kai said, "If the bass engine cannot provide mature products, I think our fighter project will be seriously restricted." ”

If there is no domestic engine matching, this will not be able to be done in a short time.

It was only possible to wait until the collapse of the USSR, through the path of the MiG Design Bureau, to seek the RD-93 engine.

The engine of the Americans, China do not think about it.

Xie Kai also wants to equip the Thunder with an F404 engine, the question is, will the Americans be happy?

This kind of thing, just think about it.

The honeymoon period would not have been too harmonious between the two sides, and the Americans never thought of really helping the Chinese to develop military technology.

During the honeymoon, only the cooperation of Black Hawk helicopters was reached, and China imported dozens of Black Hawk helicopters, especially the civilian version.

For civilian things, Xie Kai has no interest in it at all.

The difference between civilian and military technology is definitely not a little bit.

Even military technology is also divided into self-use and export.

"I'll go with you to the Western Airlines. Du Shengfeng couldn't answer Xie Kai's question, so he could only take them to Fengcheng Aero Engine Company.

This company is the unit responsible for the localization of bass engines.

Xihang is located in the suburbs of Fengcheng, and the distance from the Commission of Science, Technology and Industry for National Defense is not too far.

Du Shengfeng called them before he went, and when he took Zheng Yucheng and Xie Kai to go, Tian Rui, the director of Xihang, Li Bingkun, the secretary, and Wang Kunnan, the chief engineer, were all waiting for a few people at the factory gate.

After some greetings, Zheng Yucheng asked directly, "Director Tian, when will your turbofan-9 be able to provide finished products?"

His question made the leaders of Xihang Airlines not know how to answer.

"Director Zheng, at present, we are stepping up the localization work. In 80 years, the British company Rolls-Royce had already given the ...... of passing the evaluation," Wang Kunnan said embarrassedly.

When Xie Kai heard his words, he couldn't help but laugh, "Is it a ground test qualified?"

"The air test was also qualified. For such a young man, Li Bingkun felt that the other party was too much, but he didn't say much.

The questions asked are professional.

"Ladies and gentlemen, to tell you the truth, if we need you to provide the finished turbofan-9 engine, when will it be available? Or when will it be available?" Zheng Yucheng knew that instead of saying the marginal words, it would be better to ask them when they could provide the finished products.

"Director Zheng, I don't know ...... you" Tian Rui didn't understand what Zheng Yucheng meant.

Turbofan-9 engine, which is the engine for the J-7.

"We are ready to develop a new fighter ......," Zheng Woo-sung said calmly, "and we need a medium-thrust engine." At present, there are three models in China, only the project in your hands can meet our needs. ”

If they had to choose, they wouldn't have chosen a domestic engine.

......Hearing this, the people of Western Airlines didn't know how to answer.

"Let's go to the engine shop first. Xie Kai said.

This can also alleviate the embarrassment of the leaders of Xihang.

Originally, the bass engine was going to be handed over to Shenfei Engine Factory, but Shenfei's people were worried that it would affect the future of their turbofan-6 project, and finally resolutely resisted, and the relationship over there was good enough, so the project was given to Xifei's supporting factory.

The turbofan-9 engine is the most advanced military engine in China, and there were British engineers and technicians to help it localize it before.

In 80, three domestically produced turbofan-9 passed ground tests, high-altitude tests, and 20 hours of test flights.

In the engine workshop, I didn't see anything advanced.

Even core components such as turbine discs are imported from the UK, and the 30,000-ton press of the domestic southwest aluminum plant cannot provide processing.

The pressure is too small, and the deformation after forging is a little large, which is not suitable for use.

"The British did not give any design manuscripts, we seem to have completed the localization on the surface, but there are many technical details, even under the premise of a full set of production processes and drawings, it cannot be completely imitated successfully......" Tian Rui explained when he saw that the number of engines being assembled in the engine production workshop was not much.

"In other words, we can't produce engines independently now?" Xie Kai asked, "We introduced this engine technology, but we gave 500 million pounds!"

His words, the people of the Western Airlines, did not know how to answer.

"Many production processes, such as turbine discs, require at least 35,000 tons of presses for extrusion, and we only have 30,000 tons of die forging machines...... The high-temperature powder metallurgy of the integral turbine disc cannot be manufactured in China with such a large diameter of the single crystal turbine disc ......," Wang Kunnan said with some embarrassment.

It's not that we don't work hard, but the domestic supporting facilities can't keep up.

"If we can provide a large press of more than 35,000 tons for the overall forging of the turbine disc, can you produce a usable engine?" Xie Kai asked unceremoniously.

"This also requires monocrystalline turbine disc integral forming technology. Wang Kunnan was even more embarrassed.

"So, you haven't done much work for so many years, right?" Zheng Yucheng's words didn't take any thought into whether he offended people. "It seems that our fighter project can only seek other engines. ”

His words were very unpleasant.

The people of Western Airlines had no way to refute it.

The localization of bass engines has been going on all along, and until now, there has been no way to fully provide it.

Key components still have to be imported from the UK, and the cost of each engine is very high.

J-7 has been waiting for the engine.

It's not that they don't work hard, the technical materials provided by the British, a total of hundreds of thousands of copies, so far, it has taken almost ten years, and they have not completely translated it.

"Director Zheng, we still have a lot of process equipment that cannot complete the design and manufacturing, and the technical information provided by the British only has drawings and related processes, and there is no process equipment. Everything has to be designed and manufactured by ourselves...... Wang Kunnan said quietly, "So far, we still have at least 8,000 process equipment that have not been designed and manufactured!"

"How many?" asked Zheng Yucheng.

"More than 34,000 sets. Wang Kunnan didn't hide it, "Not to mention anything else, it's just titanium alloy hot forming technology, etc., they just give the material and the strength that needs to be achieved, and there is no relevant information about how titanium alloy hot forming can achieve the purpose we need...... In terms of materials, there are at least 76 key technologies, and they only give formulas, no process ......"

What Wang Kunnan said is the truth.

The British sold a set of engine technology to China, but this set of technology did not have any related craftsmanship and design manuscripts.

In this way, they must completely digest the technology provided by the British, and design the tooling, process and production process according to the drawings provided by the British.

It's not that they don't work hard, it's that the gap is too big.

Everything takes time and needs to be studied step by step.

"What should we do?" Zheng Yucheng asked Xie Kai.

There is no engine, and a fighter with a fart.

The Iraqis cooperated with the 132 factory, how can they interfere?

"How much money do you need, how much time do you need to provide fully localized engines? We need a lot of them, at least hundreds, maybe hundreds!" Xie Kai looked very serious.

He hoped that the people of Western Airlines would tell him that it would be available in three or five years.

This was just his imagination, and the people of Xihang had to tell him in person that at this time, the people of Xihang, whether it was the factory director, secretary, or chief engineer, all lowered their heads and didn't know how to answer his questions.