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

Overall quite a surprise.

If you have to find faults, the only thing that falls short is motivation.

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

On the one hand, the fuel consumption of the turbojet 13FII is relatively high, and one of the fuel tanks in the original 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 was highly dependent on ground guidance, and the short range was barely acceptable, and it was inseparable from the search range of the ground radar anyway.

However, the improved J-7F has strong independent combat capabilities, and its small short legs are more limited.

On the other hand, there is suddenly such a large power guster as the fire control radar, and the power supply capacity of the engine has become relatively tight.

So after seeing the fantastic performance data of 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 those of the turbojet 13, so there is no problem in installing it." Chang Haonan thought for a moment and replied:

"But the new engine has a higher flow rate and nearly double the boost ratio, so the original air intake design may have to be adjusted, and because the tail weight has become almost 100 kilograms lighter, the center of gravity of the whole machine has to be readjusted."

"Hmm......" Lu Yuying lowered his head and flicked the goblet in his hand, while calculating the current project progress and the time nodes to be grasped in his heart:

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

"But according to the design method of integrating the air inlet and the cone precursor you proposed, if you want to move the air inlet design, I am afraid that it will involve the whole body, and it will be a lot of work."

"When we received the Pakistani delegation before, we promised the other side that the first flight would be completed by June next year, and I was worried about ......."

Hearing this, Chang Haonan also frowned slightly.

With only eight months left, it doesn't seem particularly stressful, even considering the construction of the prototype.

"How far has the J-7F project progressed now?"

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

"That ......"

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

"If it's just a general engine model change, there should be time, but the core engine of the turbojet 14 and turbojet 13 is completely different after all, and our 611 Institute has never touched this model before, so we don't know anything about its air intake characteristics."

The matching of the engine and the air intake tract is a rather complex problem, if you simply put a new engine in, it will affect the performance at least and greatly increase the failure rate of the engine.

Of course, this is also related to the level of design of the intake tract, as well as the stable working range of the engine.

Typical examples of the positive comparisons are the MiG-23 and F16, the former can be matched with the AL21 and R29-300 engines, and the latter can be matched with the F100 and F110 engines.

The reverse is typical of the TF30 on the F14.

The performance of this engine on the F111 fighter-bomber is not satisfactory, but after being installed on the F14, it can be called a disgusting dog, and with the already reliable explosion of the variable swept wing design, the total number of F14s with a total of 632 crashes in the service life is as high as 144, which can be called the second generation of widow manufacturing aircraft after the F104.

So Lu Yuying's worries are not unreasonable.

"It would be nice to have someone who is familiar with both the turbojet 14 and the J-7F in all aspects of its performance."

After the last sentence, Chang Haonan finally understood.

Good guy, what about waiting for me?

What do you mean by "someone who is familiar with both the turbojet-14 and the J-7F in all aspects"?

You just report my ID number and you're done.

"Mr. Lu, your art of speaking is really clever."

Chang Haonan's tone made it difficult to hear whether he was really appreciating.

"Eh, I'm not talking nonsense."

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

"In June, I went to Lao Du, and he said that you have begun to participate in the 83 Project, so after all, you have to pay attention to the first come, first come, first come, and we can't say anything."

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

Apparently, he has already counted everything.

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

The first stage of Project No. 11 consisted of the final assembly of aircraft at Plant 112 with large parts produced by the Gagarin Aircraft Factory, as well as the translation and conversion of design data provided by the Sukhoi Design Bureau by the 601 Institute.

Chang Haonan didn't need Chang Haonan's help in this process, so he was indeed ready to try to participate in the No. 10 project after putting down the relevant work of the 83 project.

Another reason is that due to the problem of the underlying architecture of the flight control, the J-8C cannot, or has not had time to achieve integrated control of flight propulsion, and its aircraft control and engine control are still carried out separately.

The J-10 has been a real fly-by-wire flight control from the beginning, or a digital fly-by-wire, although it has not yet achieved the integration of flight propulsion, but it has the potential in this regard, and there is very enough time for Chang Haonan.

And the J-7F project is obviously a good transition pedal.

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

Chang Haonan's decisiveness in agreeing surprised Lu Yuying:

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

"Then it's settled."

The two of them touched their glasses slightly.

Li Xianzhe, who was left to dry, watched the whole process almost dumbfounded.

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

But on the other hand, they really can't come up with any decent projects to attract people at the moment.

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

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

Second, he didn't expect that someone would directly rob people at the dinner.

Not decent at all.

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

He knew that Bingcheng had an ambitious 10-ton tri-service utility helicopter plan, and although it could be said that the eight characters had not been skimmed yet, it could still be used to draw cakes.

If the other party is interested, you can consider going for it after you go back.

In the past two years, Hafei Automobile has sold very well, and there is still a little bit of idle funds......

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

However, when he looked at Chang Haonan's side again, he found that there was another person standing in front of him.

"Huh?"

(End of chapter)