Chapter 549 The Imagining of J-Twenty

  Even Qin Tao forgot when he said such a thing, but looking at Song Lao's appearance now, it is obvious that he has remembered his words in his heart. So, this idea is what has been entangled in Song Lao's mind for a long time today?

"Mr. Song, I am only engaged in warships. I am a layman in aircraft design. You are a professional aircraft designer, so you must not listen to me! We have always said that practice brings true knowledge, our duck Whether the traditional layout will destroy the stealth effect will only be known after experimenting!"

  Qin Tao felt a little helpless, Mr. Song had been entangled here for a long time, wouldn't he try it out?

"Even if it will destroy the stealth performance, we can make up for part of it through design, and the biggest advantage of the canard layout for us is that we can make up for our defects in the engine through the aerodynamic layout." Qin Tao continued to analyze: "You It is said that to engage in twin-engine heavy-duty air superiority fighters, we need to benchmark against the F-22. In the field of engines, it is impossible for us to reach the level of the United States for a long time. Therefore, we must pass an excellent aerodynamic layout to make up for it."

   Song Lao nodded.

The canard layout brings advantages in mobility. If the engine is not strong enough, it has to be compensated by aerodynamics. This is also an important design idea for their J-10. Now, if they want to develop the next generation of air superiority fighters, they must also use this idea. After all, the biggest problem with the canard layout is the flight control, and they have already mastered all of these.

   "Mr. Qin, why didn't you consider the canard layout in the vertical take-off and landing fighter you designed?" Elder Song asked Qin Tao.

Qin Tao smiled helplessly: "When our project started, the No. 10 project hadn't made its first flight yet. Our aircraft is just an improvement on the basis of the Yak-141. How could there be a radical change? .”

  These are the reasons. How could the technicians in the design office of the 31st A be as high as the staff of the 611th Institute? If they engage in a duck layout, their project will have to be delayed for at least five years.

  He can't afford to wait. This kind of project is easy to be yellow if it is delayed for a long time, and the customer will lose patience.

   Moreover, Qin Tao is aiming at the mature F-35. He doesn't want to start all over again. Even the X-32 on the other side of the ocean started to use the delta wing layout, and finally changed back to the conventional aerodynamic layout?

  Our side made a middle-of-the-road choice. Of course, this choice will inevitably lead to poor mobility. However, our side has no intention of competing with the enemy plane for mobility.

  Mr. Song has let go of the burden in his heart, and a smile appeared on his face: "Mr. Qin, what did you mean just now, that you are optimistic about our project?"

"That's right, Mr. Song, our country is vast, and we face many threats. Therefore, we must need stealth fighter jets with twin engines and heavy air control. I am optimistic about our 611 Institute. I hope we can fly advanced fourth-generation heavy stealth fighters in the future. .”

   Song Lao nodded: "Mr. Qin, thank you for your compliment, we will work hard. However, it is said that the brother unit also has ideas."

  Brother unit?

Seeing Qin Tao's puzzled eyes, Mr. Song explained: "Mr. Qin, at the defense exhibition last time, didn't you propose the idea of ​​changing the stealth aircraft with the Sukhoi Design Bureau? The technicians of Institute 601 also listened to it. Now, they are starting to think about whether they can develop a stealth heavy fighter on the basis of the Su-27."

What?

  Qin Tao was indeed a little shocked.

  He did bring it up in the first place. After all, Da Mao’s stealth machine is the idea of ​​improvement. However, this is definitely not the best choice. It is just another proof that Lao Maozi is eating his laurels.

It is impossible for Lao Maozi to completely develop a brand new fighter jet. They can only tinker with the existing foundation and flatten the Su-27 to use it as the Su-57. There are many tasteless The design has also been inherited, so Qin Tao will not be optimistic about this imperfect design.

  More importantly, it is the design of the 601 Institute. The 601 Institute will take a long time to understand the original design of the Su-27, and it will take a long time for them to improve it.

  So, Mr. Song didn't have to worry about competition at all.

   "Mr. Song, even if the brother units have ideas, I still support you." Qin Tao said: "You have the best design team, and you will definitely be able to design the best fighter!"

  Elder Song nodded, his eyes full of anticipation.

"I don't know anything else, but the turbofan 15 engine should be the most suitable engine. When the design unit understands the original design and improves it, the performance will definitely improve a lot." Qin Tao also began to introduce A: "Heavy-duty fighter jets have enough volume to design large bomb bays. The main bomb bay must be able to mount six medium-range air-to-air missiles, and the side bomb bays must be able to mount two short-range air-to-air missiles."

Although during the public display, the J-20 opened the belly bomb bay, and there were four air-to-air missiles inside, but if you look at the simulator of the J-20, it shows that the positions of the weapons are six medium-range bombs and The mounting configuration of two short-range missiles, at least eight missiles, can go out and say hello to people.

  Actually, at the beginning, the F-22 was loaded with four AIM-120 missiles. Later, part of the wings were cut off, and six missiles were forced into it.

If you want more, you can only hang them outside, which will destroy the stealth shape, and you will have to wait until the stealth repair missiles and stealth pylons appear in the future before you can hang them. At that time, with the power of the fourth-generation aircraft Performance, hanging more than a dozen pieces is not a problem.

   Now, with Qin Tao's introduction, Mr. Song's eyes are slowly brightening. Mr. Qin just said that he is not familiar with airplanes, but now, he looks very familiar!

   President Qin is really amazing!

After some chatting, the basic aerodynamic shape of the J-20 was actually revealed. The nose part is similar to the current J-31A, but it is bigger. The bomb bay is still under the air intake, and two engine, and the twin vertical tails are tilted outwards.

The appearance of this aircraft must be much more domineering than the current J-10. With the modification of the turbofan 15 as the engine, the power performance will also reach a new level. In this way, this fighter can really compete with the F- 22 competed with each other.

   "President Qin, what do you think about the vector nozzle of the aircraft?"

  Normal fighters, the nozzles are fixed, the engine can only spray backwards, and the maneuvering of the fighter is completely completed by the rudder surface.

  But the fourth-generation machine is different.

The American F-22 uses a baffle. When viewed from the rear, its engine nozzle is not a chrysanthemum petal, but two movable baffles. It can be adjusted through the baffle, which is quite simple. But not very efficient. This method can only change the airflow direction up and down, also known as binary nozzle.

Although Lao Maozi does not have a fourth-generation machine yet, he already has an omnidirectional vector nozzle. Its circular nozzle has a rather complicated structure. There are more than a dozen action tubes, which drive a large number of scale-like things. When it shakes its **** When spraying, the jet of air can rotate in circles, and it is no problem to spray in all directions. This kind of nozzle is also called a three-way nozzle.

If you compare the performance, the latter is far better than the former, but if you compare the lifespan, it is a different situation. After doing so many tricks on the heat of the engine, the lifespan is very low. The Su-30MKI with this kind of nozzle is said to have a lifespan of only 15 hours.

  Actually, the nozzle of the vertical take-off and landing fighter currently being developed can be rotated downward by more than 90 degrees, which can be regarded as an alternative vector nozzle.

  How to rotate the vector nozzle?

"That depends on our domestic research level." Qin Tao said: "Our duck layout is already very agile, so we don't need it for the time being. When the domestic scientific research level reaches the level in the future, we can come up with a suitable vector nozzle. , and then replace it with the aircraft, the flight controller can also reserve these.”

With the vector nozzle, the maneuverability of the aircraft will be greatly improved, and the flight control needs to be adjusted accordingly. Fortunately, it is now the era of fly-by-wire flight control. If the previous hydraulic control, it is impossible to complete The task of controlling so many rudder surfaces.

Qin Tao is a layman, so of course he will not interfere with these specific details of the design. To what extent the domestic vector nozzle technology has developed can the corresponding vector nozzle be used. In the first test flight, the ordinary nozzle must be used .

   "Mr. Qin, do you think our aircraft should be reserved for boarding?" Elder Song continued to ask.

   Now it has something to do with Qin Tao, after all, he is a shipbuilder, and they are currently building an aircraft carrier!

  The carrier-based aircraft used on the aircraft carrier must first be the J-15, but this type of aircraft has no stealth capability, so a stealth carrier-based fighter will definitely be needed in the future.

  So, should we consider it?

It is impossible for the J-10 to board the ship because it uses the belly air intake method. This method has the highest flight efficiency at high elevation angles, but it also faces the problem of insufficient strength. Normal take-off is no problem, but it is absolutely unable to withstand the carrier-mounted aircraft. impact.

Now this dual-engine stealth heavy fighter uses the same nose design and air intake method as the F-22. The front landing gear is also connected to the fuselage girder, so the strength is no problem, and there is no need to worry about the aircraft being ejected. Towed apart.

  So, can the J-20 be on a warship?

   This is the most debated place among military fans in later generations.

Some people support it. After all, in later generations, the J-20 is the only domestic fourth-generation carrier-based aircraft. Although the J-15 has powerful performance, it has no stealth capability after all, so it is impossible to continue to serve for decades. The carrier-based aircraft in other countries have gradually moved towards At the same time as the era of stealth, J-15 is slowly falling behind.

   So, who is the replacement?

  J-20 has a lot of calls, and I feel that the domestic black ribbon must be on the ship, so that it is enjoyable.

  There are also many voices of opposition. For example, some people say that the size of the J-20 is too large. This reason is actually untenable. The size of the J-20 is smaller than that of the J-15.

  J-15 has a total length of 22.28 meters, a wingspan of 15 meters, a height of 5.9 meters, and a maximum take-off weight of 32.5 tons. The J-20 has a total length of 20.3 meters, a wingspan of 12.88 meters, a height of 4.45 meters, and a maximum take-off weight of 39 tons.

As for the folding of the wings of the J-20, it is not a problem. The outer edge of the rear delta wing can be equipped with a special folding mechanism. Even if it is not folded, it can be placed alternately from front to back like the French Rafale fighter to reduce the footprint.

The maximum take-off weight is a problem, but it is not a big problem. With the powerful electromagnetic catapult, coupled with the advantages of the engine and aerodynamic layout of the J-20, it is no problem to take off on an aircraft carrier. If it lands, it is impossible to come back from the sky. , After returning, the fuel is almost consumed, and the self-weight will come down.

However, in later generations, the J-20 has almost never seen the picture of boarding the ship. There are many problems in it. It is not that Chengfei does not have this ability. The biggest problem is that the output of the J-20 is low. It was only thirty or forty. Later, in order to increase the output of the J-20, Chengfei directly handed over the production of the J-10 to Guifei, specializing in the production of the J-20.

Before Qin Tao's crossing, the domestic J-20 was equipped with a scale of dozens to more than a hundred. For the huge air force, it was not enough at all. The air force was not satisfied, so how could it give Used by the Navy.

  So the navy can only pinch its nose and continue to buy the J-15, which is more expensive than the J-20. And Shen Fei also felt the imminent pressure. After the era of stealth aircraft and the Su-27 and its derivatives were discontinued, would they become a foundry? They were also in a hurry, and came up with the J-31 project, and made a lot of noise saying that they would go on board, but the navy never made a statement.

What now?

If the J-10 completes all the flight test subjects, Mr. Song will lead the team to build the J-20. Maybe in the next ten years, the J-20 will be produced, so that the production will gradually increase. Does the navy need the J-2? Ten as a stealth machine?

  Qin Tao was thinking about these questions in his mind, and seeing that Qin Tao didn't answer, the hope in Song Lao's eyes gradually turned into doubt.

   "Boss Qin, is our request too much? If our J-20 needs to take into account the needs of boarding, it will form a competitive relationship with your J-31A..."

  Old Song's words brought Qin Tao's thoughts back, and the words were transmitted in his mind for a second or two before they reached Qin Tao's brain. He immediately shook his head with a smile.

"Of course not." Qin Tao said: "From the design stage, our J-31A has followed the road of international cooperation, which means that the performance of our aircraft will be well known to the outside world. Such an aircraft There is no longer confidentiality, so if our domestic army is hungry and buys a batch, we certainly welcome it, but if the army has concerns, it still won’t buy in large quantities.”

At the beginning, there was no funds in the country. If we wanted to make this kind of aircraft, we could only use a business model. The navy and air force could not complain, and the performance was known to the outside world. equipment.

This aircraft is an introduction. Through the research and development of this aircraft, it will bring domestic military aircraft to a new level. The technology of high-thrust engines, phased array radars, and stealth coatings will all enter the fast lane through the development of this aircraft. This provides an opportunity for the research and development of other stealth aircraft in China.

Even if it focuses on arms sales, it is beneficial. Arms sales are never isolated. Through the sale of this aircraft, many countries can be drawn into the Eastern camp. Even if they do not express their support obviously, at least they do not Will join forces with those conspirators.

"We predict that the vertical take-off and landing version may be suitable for the needs of the navy. In the future, the navy will have a large number of amphibious assault ships, so it will inevitably choose our vertical take-off and landing version, conventional ejection version, and land-based fighter jets. version, the domestic market should not be large.”

  Elder Song’s eyes shone with hope again: "Mr. Qin, do you mean that the navy may choose our aircraft?"

   "I don't know about this. I just made an objective analysis. I think that with the gradual deterioration of the maritime situation in the future, the Navy should need heavy-duty twin-engine stealth fighter jets."

   What does the future look like?

  The Yankee Navy will be equipped with JSF fighter jets. It is not yet known which one will eventually succeed. This fighter jet will also be equipped on aircraft carriers of other countries to show off its might.

  What about our side?

   If our own side puts the J-20 on board, will the Yankees cry and call it unfair?

  Thinking of the scene where the cumbersome fat electrics are shot down one by one, it is really pleasing to the eye!

  F-22 is only a land-based fighter, and the production line is still closed. The Yankees have nothing else to do but rely on JSF to conquer the world. It’s okay to bully the third-generation aircraft, but you have to kneel in front of the black ribbon!

   "Mr. Qin, Mr. Qin?" Elder Song became curious again, why Mr. Qin is always absent-minded today, what is he thinking?

"Well, Mr. Song, I don't think you need to think too much about the issue of J-20 boarding. At present, the first thing to do is to make land-based fighters. After all, the American F-22 is also a land-based fighter, and so is the market for the Air Force. The biggest one, wait until later, when the time is right, and transform it into a carrier-based aircraft.”

The land-based transformation of the carrier must increase the weight. Under the current circumstances, it is most appropriate to develop land-based air superiority fighters first. In the future, for example, a new engine is developed, the weight is reduced, and the thrust is increased. It can just offset the weight gain of the modified carrier-based aircraft.

   This sentence should be very common, but Song Lao opened his eyes wide: "J-20? What is J-20? Is it the aircraft we just talked about?"

  Qin Tao slipped up again, why did he also mention the model number?

  However, since everything has been said, it can only continue to talk nonsense.

   "Yes, it is."

   "But at present, our model has just reached J-15! J-14 is still vacant."

"Well, we just leave a few vacant models for the outside world to guess that we have multiple models." Qin Tao said: "Besides, the successful development of this aircraft must be in the next century, a project in the 20s , It is also very appropriate to give a code name of J-20."

  After arriving, the Youyun 20, Zhi 20, J 20, and all 20 families are not arranged according to the serial number.

  Elder Song nodded, as a tacit consent, Mr. Qin is talented in many aspects, and the number twenty is indeed a good one.

   "I'm old, and I'm very satisfied to be able to manufacture two models in my life, but I don't know what the next generation of fighter jets will look like after the era of stealth aircraft!" Song Lao felt emotional again.

  The next generation?

If it was still in the Cold War period, the update speed of weapons would be very fast. In the 21st century, fifth-generation, sixth-generation, and even seventh-generation aircraft may appear. Now, even in 2020, the J-20 All can maintain absolute air superiority, and the next generation of fighter jets may not appear until 2030 or even 2040.

  Since it's a fantasy, why not just accompany Mr. Song to dream together.

   "There could be two directions."

  Qin Tao is not an aviation major, but Qin Tao has the insight of later generations.

   "Oh, please."

"The first direction is the unmanned pilot." Qin Tao said: "The pilot gives the fighter a soul, but at the same time, the existence of the pilot also drags the fighter. The overload is always limited to about 10. If there is no pilot, the fighter can Do more high-g maneuvers, and it will be easier to dodge missiles."

   Song Lao nodded: "Yes, this is one direction, but without the pilot, how will the fighter jet operate?"

   "Rely on powerful artificial intelligence technology, that is, electronic computer technology, and cooperate with remote operations by ground operators to fight."

  In later generations, drones have become very popular, but most of them are used for detection and bombing. They are still far from being able to fight fighter jets.

   "Yes, you are right, what about the other one?"

   "The other is to rely on breakthroughs in engine technology." Qin Tao introduced: "For example, variable cycle engines."

   "Yes, it would be great if we could switch back and forth between turbofan and turbojet, but unfortunately, we don't have this kind of research and development capability yet." Song Lao said.

There is a huge gap in the engine. The world's first variable-cycle engine is the J-58 engine used by the SR-71 Blackbird. It draws the airflow on the fourth-stage compressor and passes through several pipes outside the engine. , When it reaches 2 times the speed of sound, it is directly introduced into the afterburner. The MiG-25 flies supersonic with afterburner, and the speed of Mach 3 can only fly for a few minutes, while the Blackbird can maintain this speed for a long time.

Of course, this kind of variable cycle engine is very simple and primitive, but in the bidding of the fourth generation aircraft, the YF-120 engine installed in the failed product YF-23 will be more advanced. It belongs to the double external culvert variable cycle engine. They are respectively drawn from LDFS (low-pressure shaft-driven large fan) and CDFS (high-pressure shaft-driven compressor) and sent to R-VABI (RearVariableAreaBypassInjector: rear variable bypass injector).

   However, it is estimated that the Yankees have no confidence in this engine. F-22 successfully bid by conventional methods, and YF-23 was shelved because it was too advanced, which is really ridiculous.

   "Not now, but there will be in the future. Maybe when we become stronger, we can even produce engines for aerospace planes." Qin Tao said with a smile. Anyway, he is now imagining the future and can brag without limit.

  (end of this chapter)