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

Now Qi Hai, the whole person's eye sockets are deep-set, his eyes are full of bloodshots, his originally round face is pale, and the whole person is so thin that he can't look good.

Rao is heart is angry, seeing such Qi Hai, he can't help but feel pain, is Qi Hai sick?

"Director Liu, Mr. Qi is not sick, it is mainly caused by working day and night, and huge pressure. Since our team came under the jurisdiction of the Ninth Hospital, Mr. Qi has less than five hours of rest every day, even on holidays...... "A middle-aged staff member explained to Liu Yijiu.

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

The softest place in Liu Yijiu's heart was like being stabbed by someone with a sharp knife, and his heart hurt.

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

Just like Ma Fengshan and Ma Lao in history, when the Yun-10 test flight was progressing smoothly, the Yun-10 project was disgraced, which finally made China's top large aircraft designer depressed. Liu Yijiu didn't want such a problem to happen again, but he never thought that someone in the unit he managed would be overworked and lose his life.

In such a situation, it would be pale to say anything, and he immediately asked, "What is the current situation?" ”

"The turbofan eight engine was tested on the test bench in the northwest, and the results were very good. However, at the beginning of the test on the aerial platform. All kinds of problems emerge one after another, such as the rupture of the high-pressure compressor disc and the phenomenon of surge. There was an abnormal noise in the air, the engine stopped, etc., etc., ......" Speaking of progress, Qi Hai's brows furrowed deeply.

His face was full of loneliness and helplessness.

Liu Yijiu's heart became heavier and heavier.

If the engine problem is not solved, even if the first flight of the F14 is successful, it will not make much sense.

After the collapse of the USSR. The republic is also able to purchase engines from Ukraine or Lao Maozi, and now there are simply no channels for purchasing high-thrust military engines.

It is impossible for the Americans to sell these advanced engines to China, and neither will the British.

The French themselves have problems with their own engines!

Do not solve engine problems. The only advanced fighters of the republic are the two F14s that they got from Iran!

"Have all these problems been solved?" Since Qi Hai was talking about these questions, Liu Yijiu asked as he walked towards the inside of the airport. "There must be some problems that haven't been solved yet, right? A design problem or a manufacturing problem? ”

If only these problems were solved. Naturally, it will not give Qi Hai, the chief designer of the engine, such a headache.

"Most of the problems have been solved, and at the moment our turbine disc strength is still a little insufficient. Especially in a high-temperature environment for a long time, it is easy to crack due to the increase in temperature...... After all, the pre-vortex temperature of our engine is 1800K, which is rare in the entire world......" Qi Hai said, he was speechless here.

"Since it has not been solved, why did it start to test on the air platform? If the plane falls, it will be difficult for us to find a suitable platform for air test flight. Liu Yijiu did not use the same questioning tone as in other places.

The voice was soft, but it could be heard from his words that he was trying to suppress his displeasure.

"The production process problem cannot be solved, as long as the afterburner is not opened. It's not a big problem, and it's the same on the ground test bench. No afterburner. It can be used for a long time without problems, and there is no problem with the longest continuous operation of 6,000 hours, so in the current situation, we have to consider conducting air tests first to further study the various performance of the engine...... Qi Hai's words, like a sharp knife, pierced deeply into Liu Yijiu's heart.

If the manufacturing process is not up to par, it is in vain to let them do whatever they want.

"How big of a press do we use for forging our turbine discs?" Liu Yijiu suddenly thought of this question.

Only Shanghai has a 45,000-ton hydraulic press, 132 factory, only 10,000 tons of hydraulic press, this kind of forging equipment, used to produce J-7 and other engines is no problem, after all, J-7 or even J-8 engines, are not the use of integral turbine disk technology.

If the 10,000-ton hydraulic press is used to forge the overall turbine disk, this is somewhat inappropriate, and the strength structure is different.

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 processed the fan blades through the machining center of the Ninth Academy.

"The new turbine disk, get it to the Shanghai Heavy Machinery Factory, didn't they get a 45,000-ton press? It's really not good, get it to the southwest aluminum processing plant in Shancheng, they have a 30,000-ton free forging hydraulic press over there......" Liu Yijiu sighed again.

The difference between the domestic press and the international press is too great.

Fortunately, Erzhong has now begun to challenge the 60,000-ton press, and the funds come from the Ninth Academy.

However, in a short period of time, the 60,000-ton press is difficult to form.

After all, unlike anything else, the aviation industry has too high requirements for pressure equipment. The forging of large parts, especially those heavy parts with very high structural requirements for strength, must be forged by large hydraulic presses.

The turbofan 10 has not been able to make a breakthrough because of the problem of the large press.

As soon as the second 80,000-ton press came out, many of the problems that plagued China's aviation industry were quickly solved.

Cracking occurs in high-temperature and high-pressure environments, apparently because the parts are not strong enough.

Liu Yijiu followed and walked forward, thinking about these things.

How to solve them, how to solve these problems faster, this is not something that he can change alone, he must concentrate all his strength.

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

Because it was daytime, the pilots needed to train, except for the maintenance of the aircraft, the others were dragged out and parked in the tarmac, hundreds of J-7 and Qiang-5 were neatly arranged, and on the runway in the distance, there were planes roaring and taking off from time to time.

"Due to the parking problem of the engine a few days ago, it is now being improved, and in order to keep it secret, the F14 used for the experimental engine is parked in the parking garage......" Geng Liguo saw that Liu Yijiu kept looking around the surrounding environment, knowing that he was not looking for anything else.

Liu Yijiu nodded, and took the lead in speeding up his pace and walked towards the F14 hangar where the experiment was parked.

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

"In order to ensure the smooth progress of our imitation project, the overall load-bearing structure of this aircraft, such as the girder, keel, etc., is still the original F14, and the other systems are all produced by ourselves......" Zhu Houdao explained to the stunned Liu Yijiu.

The F14 fighter in front of them, except for the aerodynamic layout outside, has not changed, no, it cannot be said that it has not changed, these guys actually sadly added a small canard wing in front of the variable main wing!

Completely changed the aerodynamic layout of this thing!

"No, I said what's going on with the canard in front of me? When did the F14 have canard wings on it? Liu Yijiu asked in surprise about the explanation.

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

Liu Yijiu felt like he was going crazy.

Although the F14 has many shortcomings, no one has ever thought that the aerodynamic layout of the F14 will be equipped with front canards.

"The first few test flights, the effect is still very good...... "Afraid that Liu Yijiu would have an opinion on this, Zhu Houdao hurriedly added. Although the canard layout aircraft has no advantages in normal flight conditions, when the aircraft needs to do large-intensity maneuvers, such as uplift, small radius hovering and other actions, the front wing and main wing of the aircraft will produce strong vortices, and the mutual coupling and enhancement between the two vortices will produce stronger lift than the conventional layout; At high angles of attack, the canard only needs to reduce the lift generated to generate a head-down moment (called the unloading control surface), which effectively ensures the controllability of suppressing excessive head-up at high angles of attack. ”

This proves that there is nothing wrong with this improvement of theirs.

Seeing that Liu Yijiu was not angry, Zhu Houdao continued to explain: "And our canard wings can also be adjusted. In normal flight conditions, it can be stowed into the interior of the fuselage and come out of it when needed......"

After explaining, Zhu Houdao hurriedly asked the person on the side to operate to show Liu Yijiu.

Canard layout, with variable sweep wings, this thing might be called a double sweep wing?

Liu Yijiu felt that he somewhat understood why all the fighters of the Republic had a canard wing layout.

This is the obsession in the hearts of the staff of Republic Airlines, and it is not that the domestic pneumatic layout technology is not good!

"You didn't think about changing the vertical wings into movable ones, did you?" In Liu Yijiu's heart, tens of thousands of fighters roared 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 an improvement, the amount of work is a bit large, and once we complete the test, we may consider such an improvement in the next step. As long as we change the shape and aerodynamic layout, even if the Americans know that this thing is actually their F14, we guarantee that no fart will be released......" Director Liu seems to have no opinion on this change, and Zhu Houdao is very excited.

"Moreover, the chiefs of the Air Force are very happy with this design......"

(To be continued.) )