Chapter 599

Hearing this, Qin Guan frowned. Although such a rigid design can temporarily meet the needs of the air force, it is not the most appropriate choice.

The J-8 is a double engine amplification from the J-7. Although it improves the nose and accommodates a large caliber radar, it is still the foundation of a second-generation aircraft.

It can do nothing but volley.

The Chinese air force is unable to equip interceptors with specific performance, just like later generations have said that MIG 31 is so powerful. Why didn't the Chinese buy some?

Of course not. What China needs is a multifunctional fighter, not a missile carrier that launches missiles from a distance.

This aircraft, no matter how developed, has congenital defects, which makes it destined to be a chicken rib, not to mention that it still has many problems.

"Mr. Qin, what do you think of this fighter?" just then, general Zhang asked.

General Zhang is also very satisfied. The nose of this fighter is very large, which means that it can be equipped with large caliber radar. Now, this aircraft looks very good.

Qin Guan knew that he had to take the initiative to attack at this time. He could not be a good man. This aircraft had all kinds of problems from finalization to retirement. Now he is doing this for the good of the air force.

"I think it has a big problem," Qin Guan said.

When Qin Guan finished, the lively atmosphere in the whole conference hall was suddenly cold. This is 6601's own site, and there are countless arrogant engineers. Now, the aircraft they developed themselves is said to be problematic?

Which onion are you? Can you, a small workshop worker who doesn't know how to climb up from the tank factory by nepotism, point out the problem of advanced fighters? You're paranoid, too.

"Mr. Qin, what's wrong with it?" at this time, Mr. Gu is also suppressing his anger. If you can't say it, don't blame everyone for drowning you with one mouthful of spitting.

"Its flight control system," Qin Guan said, "this aircraft is amplified on the basis of MIG 21. Although it is synchronously amplified, the torque required to control the rudder surface does not increase in direct proportion, and our control system does not follow the progress, so there will be serious problems."

During the entire service period of the J-8, various problems emerged one after another. Now, Qin Guan takes a basic example, that is, the flight control system.

Yes, this is the weakest part of 6601. The J-11 and J-8 planes of later generations fell because of flight control. They can't control them at all. Now, even if they think they made the J-8, they are also facing serious flight control problems.

Hearing what Qin Guan said, the Engineer in charge of flight control on the scene was about to stand up angrily, but Qin Guan continued to explain. Next, it would be very professional.

"In the flight control system, the pulsating stress caused by oil always exists in the pipeline of the hydraulic system. The starting and stopping of the engine will cause the resonant frequency coupling of oil and hydraulic pump back impulse; in the process of thrust change, the axial and radial changing stress will be formed due to the change of displacement and vibration of hydraulic components. During the flight of this aircraft, the hydraulic system will start to change Finally, the aircraft will be subjected to a great alternating load and repeated action. Over a long period of time, there is a high probability of pipeline fatigue rupture, oil leakage and complete loss of control of the aircraft. At most half a year, the pipeline will rupture, flight control failure and crash. "

"Mr. Qin, you are so whimsical." hearing this, the flight control designer finally stood up: "I really know a lot. I even know all kinds of stresses. However, can't you see? In order to make the control system more stable, we changed it to redundant hydraulic system. There are three systems in total. Even if one of them fails, the other two can ensure the normal flight of the aircraft."

It must have been taught by the guys of 6611 Institute before he came out. However, it doesn't matter. His side has a response plan and has long changed to multi pipeline. What are you afraid of.

"This is the most idiot." at this time, Qin Guan has stepped on the large-scale beautiful design drawing and began to point to a certain position above to explain. In later generations, this has been seriously criticized by the air force.

"Sorry, I'm wrong. It should be that this scheme is the most talented." Qin Guan said: "look here, there are specially designed oil communication pipes, and the three systems are completely interconnected."

"What do you know? We want to be reliable. In case one of the pipelines has a problem, we can borrow it from another pipeline." of course, the flight control designer is very angry, idiot and genius. It's all ridicule. What do you know?

"That's the problem." Qin Guan pointed to the position: "This hydraulic pump is the most talented one. After one of the hydraulic pumps is damaged and the pipeline pressure drops by 10%, the hydraulic pump will immediately draw hydraulic oil to make up for it. This speed is more than 2.3 times the maximum flow of pressurized air, that is to say, one set of oil leaks, and the other two sets of hydraulic oil will soon be sucked away by the broken one. This kind of design of death with death is really beautiful A talented redundant backup security design. "

Speaking of this, the flight control designer's face has turned white. Yes, in the past, he thought this design was very correct, but now it seems that there is a problem.

"Of course, this genius is not just here." Qin Guan continued to explain in professional language and pointed to various positions at the same time: "Here, the air in the hydraulic pressurized oil tank is in direct contact with the oil. Under the negative pressure state of the hydraulic oil tank, a large number of dissolved air in the oil will overflow and disperse. The oil with bubbles will collapse rapidly after entering the high-pressure area, and the pressure at the collapse is more than 10 times higher than the normal working pressure. The resulting high-frequency vibration of the oil supply system will pump and recoil with the hydraulic pump at 80% engine speed Resonance and natural frequency of conduit form fluid solid coupling vibration of pipeline, causing rapid fatigue damage. "

Qin Guan continued to use a more incisive words to summarize: "this is not only to die, but also to die quickly, so fast that there is no time for the pilot to parachute."

The scene had completely calmed down. The brick experts were stunned and wanted to refute Qin Guan's words, but they didn't know where to refute it, because the other party's inference was quite perfect.

Xiang Jing, the scholar sitting below, thought they were making soy sauce. As a result, Qin Guan's professional terms kept jumping out. Is this also Qin Guan's super ability?

That's too rebellious. He knows everything? Look at the expressions of these brick families, you know how embarrassed they are, genius? Idiot?

Qin Guan sighed in his heart. These bricklayers are full of loopholes, but they are not afraid. Every time an aircraft has a flight accident, they will push it on the pilot's head.

In terms of selfishness, it's enough for Qin Guan to say this, but after all, this is a fighter independently developed by the Han state. Since you want to say it yourself, let's say everything else.

"Then I'll talk about other defects," Qin Guan continued.