Chapter 1424

"To what extent has the pre research of new fighters reached?" Qin Guan asked old song.

At the end of 1981, Qin Guan visited here. At that time, old song reported to Qin Guan. After the J-10 test flight, old song handed over the task of modification to his men, while he took the pneumatic team to study the layout of the next generation of fighters.

However, Mr. Song was also worried about the conflict with Mr. Lu's project. After all, Mr. Lu also planned to transform the J-11 into a stealth fighter. It would be too wasteful to develop two fighters at the same time.

However, Qin Guan gave great support. Therefore, with the support of Qin Guan, song Lao's research and development officially began. Now, two years have passed. What is the progress of song Lao?

"We have made a wooden prototype," said Song.

Even now, Hanxin technology company has been able to manufacture advanced computers in this era, and has begun to widely use computer-aided design. However, wooden models are still a necessary thing.

Hearing that old song said he had made a wooden prototype, Qin Guan was very excited: "let's go and have a look!"

In that parallel world, in this era, the J-10 has not been officially approved. Driven by Qin Guan, the R & D of J-10 B has been completed, and even the latest j-20 has come out with wooden prototypes. How can Qin Guan not be excited?

Qin Guan came here with his wife and children. On the one hand, he took his children to visit the mountains and rivers here. On the other hand, he came to see the progress here.

Now that he had it, Qin Guan was certainly quite excited.

"Can't we wait for Chen Rui to come down?" asked old song.

Qin Guan shook his head: "don't wait. Let him fly on. Let's go and have a look."

So, leaving Chen Rui, who was testing the mobility of the J-10 in the sky, Qin Guan, led by old song, walked into the workshop with scholars.

At the beginning of the design, Mr. Song said that the duck layout should be adopted. Now, what is displayed in front of Qin Guan is a double engine heavy machine with duck layout.

"The future sky belongs to stealth aircraft, so when we design, we mainly consider stealth." Song said: "President Qin, this is your bold prediction, which we absolutely agree with."

This is also an adventure for Mr. Song, because so far, the air force has not invested any funds in the fourth generation aircraft project. The current projects are all self raised by the enterprise.

In the past, this was unthinkable. If the superior has an order, there will be a development plan below. Otherwise, it can be equated with crime. It is a crime of wasting the wealth of the motherland.

But now it is different. The country is carrying out economic reform and reform, and has radiated great vitality. In the research and development of new fighters, they can finally do it by themselves. They have made a lot of money in the production of the J-10.

Stealth, on the one hand, depends on the absorbing coating, on the other hand, depends on the shape design. In short, it is to make the shape of the aircraft into an inclined plane to reduce the vertical reflection of radar waves and scatter them in other directions.

This approach should also be combined with the pneumatic layout. In order to take this approach into account, the pneumatic should not be ignored.

One extreme of this is F-117, which is awesome for stealth, which leads to the appearance of aerodynamic disaster. Some people even believe that it can fly when designing, but fortunately, people are very capable.

At that time, it was also because the computer technology was not developed enough. The shape of the backward aircraft was very beautiful.

Now, our computer simulation technology is very powerful. The server composed of multiple Han core CPUs is also serving scientific research.

The model plane in front of us is very similar to the j-20 of later generations.

Song Lao studied duck layout for more than 20 years. Now, it's time to blossom and bear fruit.

"In our stealth consideration, the canard wing is the easiest to increase the radar reflection surface. Therefore, we deliberately reduced the area of the canard wing. In order to achieve the same effect, we advanced the canard wing." old song introduced it to Qin Guan, because old song knew that Qin Guan was also an expert.

The J-10 adopts the medium range coupling mode, which is the best scheme after our own research. It can effectively use the vortex of the canard wing and have a strong control effect.

However, Eagle engineers said that the best canard wing is on the enemy's aircraft, that is, it has a large radar reflection area. Now, the way adopted by Mr. Song is to advance. The canard wing of this verification aircraft model is further ahead of the main wing than the J-10, which increases the force arm and enhances the utility, so the smaller canard wing can play a great role.

"But in this case, the vortex generated by the canard wing can not be used by the main wing, so you have added strips behind the canard wing," Qin Guan continued.

When Qin Guan said this, Mr. Song immediately showed his admiration. President Qin immediately understood his own design. The duck wing can produce eddy current. The research and development of the third generation aircraft is the use of eddy current. Looking at the fighters, they began to engage in eddy current. Whether it is the duck wing or the side wing, eddy current is used.

"Yes, it's the edge strip. Moreover, our movable edge strip is behind the canard wing. The edge strip can be controlled to sag, the movable edge strip can strengthen the vortex lift and control the direction of the vortex. In this way, the aerodynamic control ability has been further improved." the accumulation of many years has been shown now. To play aerodynamic, I'm afraid no one in the world can play song Lao.

Look back, it's the vertical tail.

A tall vertical tail is the main way of radar reflection. Therefore, if you want to be invisible, you must tilt the vertical tail. In this case, one is not enough.

Two engines and two vertical tails, and the vertical tail is inclined outward, so that the radar wave reflected by the vertical tail can go to other directions.

The price is that the control is complicated, and the design of song Lao is simply a nightmare for flight control designers.

Even the F-22 and F-35 are conventional fixed vertical tail and movable rudder, while the vertical tail of this aircraft is fully movable.

In this way, the preparation of flight control is extremely complicated. There are more than 20 control surfaces on the whole aircraft, which makes programmers crazy.

"There's no way. We don't have a strong engine. We can only find the advantage from the pneumatic," said Song.

According to the plan, the new generation of engines should have a thrust to weight ratio of 10, but our own side does not. Spey's thrust to weight ratio is only 5. The current F110 and our own designed engine have a thrust to weight ratio of less than 8, so we can't meet the requirements of the new generation of fighters.

Another reason is that there is no vectoring nozzle technology.