The military-industrial scientific research system of the academic master.

As the design work of the J-7F comes to an end, the specific performance indicators of this aircraft have gradually been determined.

Overall quite surprising.

If I had to nitpick, the only shortcoming would be the power.

The turbojet 13FII is indeed a usable model, but it is still somewhat unsightly when installed on the J-7F.

On the one hand, the fuel consumption of the turbojet 13FII is relatively high, and a fuel tank in the original lower jaw part is occupied by the air intake, which makes the already poor range even worse.

The original J-7 was just a daytime fighter that relied heavily on ground guidance. Its short range was barely acceptable, and it was inseparable from the search range of ground radar anyway.

However, the improved J-7F has strong independent combat capabilities, but its short legs are more restrictive.

On the other hand, with the sudden addition of a power-hungry fire control radar, the power supply capacity of the engine has also become tighter.

So after seeing the fantastic performance data of the Turbojet 14 during the day today, Lu Yuying's first thought was -

Gotta find a way to fit it on my plane!

"The size and weight of the Turbojet 14 are smaller than that of the Turbojet 13, so there is no problem in installing it." Chang Haonan thought for a moment and then replied:

"But the new engine has a larger flow rate and a boost ratio that has nearly doubled, so the original air inlet design may need to be adjusted. And because the weight of the rear part has become lighter by almost 100 kilograms, it will have to be redesigned. Adjust the center of gravity of the entire machine."

"Well..." Lu Yuying lowered his head, flicked the goblet in his hand, and at the same time calculated the current project progress and the time points to be grasped in his mind:

"It's not difficult to adjust the center of gravity. After all, it's getting lighter, not heavier. Just add some fuel to the tail."

"But according to the design method you proposed to integrate the air intake and the cone front body, if we want to change the design of the air intake, I am afraid that it will affect the whole body, and the workload will be huge."

"When we received the Pakistani delegation before, we had promised to complete the first flight before June next year. I am worried..."

Hearing this, Chang Haonan also frowned slightly.

There are only eight months left, and even considering the production of prototypes, it doesn't seem to be particularly stressful.

"At what stage has the J-7F project progressed now?"

"The design of the original plan has basically been completed, and a J-7B aircraft has been found to prepare for modification. It was originally expected to start at the end of this month."

"That……"

Chang Haonan was about to speak, but was interrupted by Lu Yuying:

"If it were just a general engine model change, there should be enough time, but after all, the core engines of the turbojet 14 and the turbojet 13 are completely different. Our 611 Institute has never been exposed to this model before and knows nothing about its air intake characteristics. I know."

Matching the engine and the intake duct is a quite complex issue. If you simply insert a new engine into it, the performance will be affected at least, and the engine failure rate will be greatly increased at worst.

Of course, this is also related to the design level of the intake duct and the stable working range of the engine.

比较正面的典型是米格23和F16，前者可以匹配AL21和R29-300两种发动机，后者则可以匹配F100和F110两种发动机。

The typical negative example is the TF14 above the F30.

The performance of this engine on the F111 fighter-bomber was not satisfactory, but after it was installed on the F14, it was disgusting. Coupled with the variable-sweep wing design with explosive reliability, there were only 632 F14s in service. The number of crashes in his career was as high as 144, making him the second-generation widowmaker after the F104.

Therefore, Lu Yuying's worries are not unreasonable.

"It would be great if there was someone who is familiar with both the turbojet 14 and the various aspects of the J-7F's performance to help."

After saying the last sentence, Chang Haonan finally understood.

Good guy, were you waiting for me?

What does it mean to be "a person who is familiar with both the Turbojet 14 and all aspects of the J-7F's performance"?

Just give me your ID number and that's it.

"Mr. Lu, your speech art is really superb."

Chang Haonan's tone made it difficult to tell whether he was really expressing his appreciation.

"Hey, I'm not talking nonsense."

Lu Yuying's expression on the opposite side did not change. Ever since he failed to rob someone last time, he realized that when doing this kind of thing, being thick-skinned is king:

"In June, I went to see Lao Du, and he said that you had already started to participate in the 83rd Project. After all, it has to be on a first-come, first-served basis. We can't say anything else."

"But now, I think the 83rd Project should be almost over..."

Apparently, he had figured it all out.

In fact, this is exactly what Chang Haonan himself is considering.

The first stage of Project 112 is that Factory 601 uses large parts produced by the Gagarin Aircraft Factory for final assembly of the aircraft, and Institute translates and transforms the design data provided by the Sukhoi Design Bureau.

This process does not require Chang Haonan's help, so he is indeed planning to participate in Project 10 after putting aside the work related to Project 83.

Another reason is that due to problems with the underlying flight control architecture, the J-8C cannot, or does not have time to achieve integrated flight and thrust control. Its aircraft control and engine control are still performed separately.

The J-10 has had a real fly-by-wire flight control or a digital fly-by-wire flight control from the beginning. Although it has not yet realized the integration of flight and thrust, it has the potential in this regard, and Chang Haonan has plenty of time.

The J-7F project is obviously a good transitional step.

"It shouldn't be a problem for me to help."

Chang Haonan's decisiveness in agreeing surprised even Lu Yuying:

"As for the specific form of cooperation, it will be determined between the 611 Institute and Academician Du. If nothing else happens, it should still be carried out in the form of project application."

"Then it's settled."

The two clinked their glasses.

Li Xianzhe, who was left standing next to him, watched the whole process almost dumbfounded.

After he learned that Chang Haonan was not an employee of Institute 601, but a person from Beijing Hang University, he didn't think about asking him for help.

But for one thing, Bingcheng really can't come up with any decent projects to attract people.

The Y-12 is just an inconspicuous five-ton small transport aircraft, while the Z-9 has no clear follow-up modification plan.

Even if there is one, it is unlikely to be a big project.

Secondly, he didn't expect that someone would directly grab someone at the dinner party.

Not decent at all.

After Chang Haonan put down the wine glass in his hand, Li Xianzhe began to consider whether he should probe the other party's tone first.

He knows that Bingcheng has an ambitious 10-ton tri-service general-purpose helicopter plan. Although it can be said that it has not been revealed yet, it can still be used to draw conclusions.

If the other party is interested, you can consider fighting for it after you return.

Hafei Automobile has been selling very well in the past two years, and there is still some idle funds...

The more Li Xianzhe thought about it, the more he felt it was worth a try.

However, when he turned his attention to Chang Haonan again, he found that there was another person standing in front of him.

"what?"