The moment he saw Qi Hai, Liu Yijiu didn't even recognize him.

Now Qi Hai, his eyes are sunken, his eyes are covered with bloodshot, his originally round face is pale, and he is extremely thin.

Even though I was angry, I couldn't help but feel pain when I saw Qi Hai like this. Could it be that Qi Hai is sick?

"Director Liu, Mr. Qi is not sick, it is mainly due to working day and night, and the huge pressure. Since our team is under the jurisdiction of the Ninth Hospital, Mr. Qi's rest time is less than five hours a day, and he has no rest even on holidays," a middle-aged staff member explained to Liu Yijiu.

"It's okay, Director Liu, I will be able to rest well when the air platform test is completed," Qi Hai said to Liu Yijiu in a hoarse voice.

The softest part of Liu Yijiu's heart was as if someone stabbed him with a sharp knife, and his heart ached.

Now he can't say anything he asks, even if Qi Hai doesn't have any explanation, he can understand it.

Just like Ma Fengshan, Ma Lao, in history, when the Yun-Ten test flight work was progressing smoothly, the Yun-Ten project was dismissed, which eventually made the top large aircraft designer in China depressed. Liu Yijiu did not want such a problem again, but he never thought that someone in the unit he managed would be overworked and lose his life.

In this situation, everything you say looks pale, and immediately asked, "What's the current situation?"

"The turbofan eight-motor test was conducted on the test bench in the northwest, and the effect was very good. However, when the platform above was tested, various problems emerged one after another, such as high-pressure compressor disc rupture, surge phenomenon, abnormal sound in the air, motivational parking, etc. " Speaking of progress, Qi Hai's brows frowned deeply.

His face was full of loneliness and helplessness.

Liu Yijiu's heart is getting heavier and heavier.

The motivation problem is not solved. Even if the f14 flight is successful, it does not make much sense.

After the collapse of the Soviet Union, the Republic was able to purchase motivations from Ukraine or the Russians, but now there is no channel to purchase military motivations for large thrusts.

It is impossible for Americans to sell these advanced motivations to China. The British would not sell them either.

The French's own motivations are all problems

If the motivation problem is not solved, the Republic's advanced fighter jets are the only two F14s they got from Iran.

"Have all these problems been solved?" Since Qi Hai was talking about these problems, Liu Yijiu followed the airport and asked. "Some problems should not be solved yet, are the design problems or the manufacturing problems?"

If all these problems were solved, it would naturally not cause such a headache for Qi Hai, the chief designer of motivation.

"Most of the problems have been solved. At present, our turbine disc strength is not enough. Especially in long-term high-temperature environments, cracks are easily generated due to the increase in temperature. After all, our motivational pre-vortex temperature is 18k, which is rare in the whole world." Qi Hai said that it was speechless here.

"Since there is no solution, why do you start testing the above-air platform? If the plane is dropped, it will be difficult for us to find a suitable air test platform." Liu Yijiu did not use a questioning tone as if he was elsewhere.

The voice was very gentle, but it could be seen from his words that he was trying hard to suppress his dissatisfaction.

"The production process problem cannot be solved. As long as the force is not activated, there is no big problem. The same is true for the ground test bench. If the force is not activated, it can be used for a long time without any problem. There is no problem in running continuously for up to 6,000 hours. Therefore, under the current circumstances, we have to consider conducting air tests first and further study the various properties of the motivation." Qi Hai's words were like a sharp knife, deeply piercing Liu Yijiu's heart.

If the manufacturing process is not up to standard, it will be in vain if they do anything.

"What kind of press does our turbine disc use for forging?" Liu Yijiu suddenly thought of this question.

Only Shanghai Stock Exchange in China has a 450,000-ton hydraulic press, and in Factory 132, there is only a 10,000-ton hydraulic press, this kind of forging equipment. There is no problem with the motives used to produce J-7 and other motives. After all, the motives of J-7 and even J-8 do not use the technology of the overall turbine disc.

If a 10,000-ton hydraulic press is used to forge the overall turbine disc, it is a bit inappropriate, with different strength structures.

Zhao Liangbi, who came here, heard Liu Yijiu's words and quickly replied, saying that this thing was forged by a 10,000-ton hydraulic press, and then the fan blades were processed through the processing center of the Ninth Academy.

"If you get a new turbine plate to the Shanghai Heavy Machinery Factory, why didn't they get a 450,000-ton large press? It's really not good. When they get a 30,000-ton free forging press in the southwest aluminum processing factory in Shancheng, they have a 30,000-ton free forging press on there." Liu Yijiu sighed again.

The difference between domestic large presses and international ones is too big.

Fortunately, Er Chong has now begun to challenge the 60,000-ton large press, and the funds come from the Ninth Hospital.

However, in a short period of time, a large press of 60,000 tons is difficult to form.

After all, the aviation industry is not like anything else, and the requirements for pressure equipment are too high. Forging large parts, especially heavy parts with very high strength and structure requirements, must be forged by large hydraulic presses.

The Turbofan Ten has never been able to make breakthrough progress, and it is also because of the problem of large presses.

Once the 80,000-ton press of the second-level large press was released, many problems that plague China's aviation industry were quickly solved.

Cracking occurs in high-temperature and high-pressure environments, obviously because the strength of the parts is insufficient.

Liu Yijiu followed him forward while thinking about these things.

How to solve these problems and how to solve them faster is not something that he can change by himself. He must concentrate all his strength.

Phoenix Mountain Airport, as the largest military airport in the Chengdu Air Force, naturally has the largest number of military aircraft.

Since it was daytime, pilots needed to train. Except for the maintenance aircraft, the rest were dragged out and parked in the apron. Hundreds of J-7 and Qiang Five were arranged neatly. On the runway in the distance, planes roared and took off from time to time.

"Because of the parking problem of the motivation a few days ago, improvements are being made. In order to keep it confidential, the F14 used for the experimental motivation is parked in the shutdown hangar." Geng Liguo saw Liu Yijiu constantly looking around the surrounding environment, knowing that he was not looking for something else.

Liu Yijiu nodded and took the lead in speeding up his pace towards the f14 hangar used for parking for the experiment.

When he entered the hangar and saw that the paint became colorful, the corners of his mouth twitched.

"In order to ensure the smooth progress of our imitation project, the overall bearing structure of this aircraft, such as the beam, keel, etc., was originally from the F14, and other systems were produced by ourselves," Zhu Houdao explained to Liu Yijiu who was stunned.

The f14 fighter in front of us has not changed except for the aerodynamic layout outside. No, it cannot be said that it has not changed. These guys actually added a small duck wing in front of the variable main wing.

Completely changed the aerodynamic layout of this thing

"No, I'll tell you what happened to the canard in front of you when was there a canard on f14?" Liu Yijiu asked Zhu Haodao in surprise.

"In order to make the fighter take off faster and increase the climb rate, after our experiments, we found that if there is a canard layout on the fighter, it can increase greater lift during the takeoff," Zhu Houdao said embarrassedly.

Liu Yijiu felt like he was going crazy.

Although f14 has many shortcomings, no one has ever thought of adding front canard wings to the aerodynamic layout of this f14.

"The previous few test flights were still very good," Zhu Houdao quickly added. "Although the duck-style aircraft has no advantages in normal flight conditions, when the aircraft needs to maneuver with a large intensity, such as upward tilt, small radius hovering, etc., a strong vortex will be generated on the front wing and main wing of the aircraft. The mutual coupling and enhancement between the two vortexes produce stronger lift than the conventional layout; in the large angle of attack, the canard only needs to reduce the lift to generate a head lowering torque called the unloading control surface, which effectively ensures the controllability of suppressing excessive head-up at a large angle of attack."

This proves that their improvement is nothing wrong.

Seeing that Liu Yijiu was not angry, Zhu Houdao continued to explain: "And our canards can also be adjusted. Under normal flight conditions, they can be put into the inside of the fuselage and come out from it when needed."

After explaining, Zhu Houdao quickly asked the people on the side to show Liu Yijiu.

Canard wing layout, plus variable swept wings, this thing may be called double swept wings

Liu Yijiu felt that he understood a little why all the fighter planes in the Republic had candles.

This is the obsession in the hearts of Republic aviation staff, not that domestic pneumatic layout technology is not good

"You haven't thought about changing the hanging wings to movable ones." Liu Yijiu's heart, tens of thousands of fighter jets whizzed by, and he felt that these aircraft design engineers were crazy.

"Director Liu, it's not that we haven't thought about it, but if we want to make such improvements, the project volume is a bit large. Once we complete the experiment, we may consider this improvement in the next step. As long as we change the appearance and pneumatic layout, even if Americans know that this thing is actually their F14, we can't even let go of any farts." Director Liu seemed to have no objection to this change, and Zhu Houdao was very excited.

"And, the Air Force chiefs are very satisfied with this design."

To be continued.

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