"They don't have access to the core design aspect. They just give us whatever technology we want."

"I guess they just gave us the old Tu-160 plan, so it looks so backward."

"Why are these old idiots so inattentive to their work? Do you still want the engine technology?"

Tang Changhong looked a little unhappy. As he spoke, he quickly flipped through the information at hand. When he saw the stamp of "Tupolev Design Bureau" stamped on the last page, he couldn't help but curse.

The sound comes.

"Damn it, it's really an old design! Look, it's still stamped with Tupolev's seal!"

Gao Yongyu came over to take a look, and was dumbfounded on the spot.

The Tupolev Design Bureau is indeed the design bureau of the Tu-160, but the problem is that this thing was before the disintegration of the Soviet Union.

After the disintegration, the Tupolev Design Bureau was reorganized into the Russian United Aviation Manufacturing Group. Although the framework has not changed, the title has changed after all.

Therefore, if the gas filling device required by 605 this time is an improved version from Russia, it should be stamped with the seal of United Airlines.

But now, Tupolev’s chapter above

Who knows which archive they dug it out from to make up the numbers!

In fact, the inert gas filling device of the Tu-160 had been redesigned as early as 2003.

At that time, a Tu-160 crashed at an altitude of nearly two thousand meters due to a fuel tank explosion. After investigation, it was found that the cause of the accident was that the filling device did not fill the wing fuel tank with inert gas in time.

After that, United Airlines redesigned the aircraft's gas filling device as quickly as possible and gradually replaced all old devices.

It is precisely because of this new design that similar accidents have never happened again.

And now, they are actually reluctant to even give this new design.

"This is too perfunctory. In business, although we are only doing technical exchanges, we are not so mean."

Gao Yongyu shook his head and said.

"Whether they are perfunctory or not, just call them back and tell them they can't use it."

"When will you come up with a matching design plan? When will you come back to us?"

"If even this small problem cannot be solved, then I will directly notify Chengdu and stop their PAK FA cooperation project."

"clear."

Gao Yongyu nodded quickly.

After a pause, a smile suddenly appeared on his face.

"Mr. Tang, you are really tough when it comes to what you say now. You always want to stop other people's projects. If those old fools hear this, they will probably slam the table in anger."

Tang Changhong laughed loudly and then replied:

"We have been aggrieved for so many years, and now we finally have something in our hands. How can we not vent our anger?"

"I'm not really making things difficult for them. Like you said, it's just business."

"When we begged them before, it was a trainload of ore and technology in exchange for materials."

"Now we don't care what they want. Technical exchanges must look like technical exchanges. What's the point of hiding them?"

"That's true."

Gao Yongyu replied in agreement.

"In the end, they are still begging us now."

"Without their technology, we would be slower at best."

"But without us, I guess their fourth-generation aircraft would be difficult to come up with - at least in terms of stealth design, there would be no chance."

“Is the PAK FA project so bad?”

Hearing this, Tang Changhong was a little surprised.

In his impression, although Russia is not leading in terms of fourth-generation aircraft, it still has technological accumulation.

But now, listening to Gao Yongyu's words, it seems that this project has already ended before it even started.

"It's very bad. I have communicated with Chengdu Aircraft Corporation. In the original plan, they used a central lifting body + tandem magazine, which has a great impact on the structural strength."

"In the first blow tunnel, structural cracks in the fuselage had already appeared. After analysis, it was found that the belly of the fuselage was too fragile due to the tandem magazine and could hardly withstand the impact of high-intensity airflow."

"However, the PAK FA's belly air intake design is the most complex design for belly airflow. These two problems are superimposed and create an almost endless loop."

"In addition to this, there are also problems with the stealth design."

"Coupled with the problem of turbulent airflow in the boundary layer that has been blown out, it is conceivable that after the engine is put on the machine, the unstable function of the air inlet will definitely lead to engine surge."

"Look, there are already three questions."

"Moreover, these three issues are still the most important ones, and there are a lot of others."

"so serious?"

Tang Changhong's eyes widened.

He subconsciously scratched his head and recalled the development process of the J-20 and J-22.

It seems that from beginning to end, I have never heard of any major design problems in these two projects.

They all start manufacturing immediately after getting the drawings. There may be some small optimizations, and of course there will be defects that must be accepted, but they all fall into the category of "machine is not perfect".

In a situation like PAK FA, it’s really

Yes, after all, they don't have Chen Nian.

Obviously, situations like the PAK FA project are normal situations for aircraft design projects.

People like me are just taking advantage of Chen Nian.

Thinking of this, he breathed a sigh of relief happily.

Before that, he had lamented the incredibleness of this young man named "Chen Nian" many times.

But at this moment, when the progress of the PAK FA project was before his eyes, he truly realized what this young man had brought to him, to the aviation industry, and to this country.
Chapter completed!