What are the benefits?

Of course, it is to save space, J-7 and J-8 have very few wings, why? Because the internal space was occupied by the landing gear, it was impossible to hang missiles, and the wing root had the strongest load-bearing capacity, but it was all wasted.

This is one of the big drawbacks, and the third-generation aircraft are all strengthened mounting, what should I do at this time? The only way to do this is to move the landing gear directly under the fuselage and receive it into the fuselage, so that the wings are free, and more missiles can be hung, what auxiliary fuel tanks and the like, and how many can be on it.

In the design of the J-10, this kind of landing gear is to be used, recycled into the fuselage, and when it comes out, it must be tilted to the outside, so as to increase the width of the landing gear, otherwise, it will be narrower.

In this way, a unique splayed landing gear was formed, which has become a trend, but for the 611 Institute, it is definitely the first time.

At the beginning, the Soviet Union also used the outer figure-eight landing gear for the first time on the MiG-23, when the MiG-23 used a variable swept wing, so that the landing gear must not be installed on the wing, but as a single-engine fighter its fuselage space is very limited, and the complex variable swept wing mechanism occupies a part of the upper fuselage, and the result is that the space reserved for the landing gear in the belly is very narrow.

The Mikoyan Design Bureau was too big to figure it out on its own, and finally solicited design proposals for aviation systems throughout the Soviet Union, and as a result, the "crab claw" landing gear designed by a female student majoring in aviation stood out among many schemes.

This landing gear is jointed, like a crab's claw, with two "joints", compact when retracted, and long when down, the problem is perfectly solved.

And Song Lao's design has reserved enough space for the landing gear, and it is enough to use the conventional design, but it is not easy to make it.

In the past, the wing landing gear was vertically downward after being stretched out, so as long as it bears the downward impact force, there is a buffer hydraulic cylinder on the landing gear to buffer, and there will be no big problem, but now it is the landing gear of the outer figure-of-eight, and the buffer mechanism is tilted, in order to support the body, it needs to have high enough strength, in order to be able to buffer, the oil cylinder of the landing gear needs to have high machining accuracy, and it needs to be processed with high-precision CNC machining, in China, this is a blank.

Because there is a big technical problem in this area, it is a hard bone in the design. For the rapid development of the project, cooperation with foreign countries is taken into account.

Now, the conditions given abroad have also been offered, in the face of this request, can Song Lao agree?

Of course not!

"Even if we had the money, we couldn't afford to waste it like that. Gnawing on other people's cold steamed buns can only be beggars. Song Lao's words were solemn, now, everyone is looking at him, what he is talking about now is, of course, not only a problem of the landing gear, but also the design of all the subsystems of the entire fighter.

"Don't wait, don't rely on, and don't expect foreigners to help us, through our own efforts to let the landing gear of the J-10 aircraft flow our own blood." Song Lao said: "We believe that as long as we rely on our own efforts, we will definitely overcome these problems." ”

The funds given by the state for the development of aircraft are too small to be wasted, and if you can do it yourself, you have to do it yourself; after all, it is unrealistic to want to rely on foreign technology to achieve the take-off of your own fighters.

Song Lao's gaze is firm, what foreigners can do, we must be able to do it ourselves, the landing gear, we must get it out ourselves!

Qin Feng was also deeply infected, someone once sarcastically said that Song Lao wanted to use a penny to repair the Great Wall, but now, Song Lao has this momentum, no matter how much effort he makes, he must complete the entire Jian-10 project, and hand over a satisfactory answer to the motherland and the people, at the same time, what can be saved, must be saved, and if you can do it yourself, don't go abroad!

"We process it ourselves, test it ourselves, and we must overcome this technical difficulty!" The comrades in charge of the landing gear also made up their minds.

Facing this scene, Qin Feng couldn't help but think of another question: "Old Song, there is a big gap between our landing gear and foreign ones, do we have a pre-research on the brake disc inside?" ”

When the test flight Phantom 2000, when it came down, people didn't use the parachute at all, and directly braked with the brakes, Qin Feng was quite shocked at that time, and after touching the brake pads of others, the brake pads were not hot, and they did not drop dust, only to know that people used the most advanced carbon carbon brake pads, and now, do we have this kind of thing?

Song Lao shook his head: "No, we are also very backward in terms of basic material research, but this is not a necessary project, we do not have advanced brake pads, and there are previous methods to put a deceleration parachute." ”

What to look at when measuring a large country? It is not to look at how high the GDP is, nor how many high-tech products there are, but to look at its basic industry.

South Korea's electronics industry is huge and the world's advanced level, but if Japan is stuck in the neck of several materials, it will face a major crisis.

The Soviet Union has long since collapsed, when the Varyag was brought over, and after staying in the port of Dalian for so many years, the hull is not rusty, nor is it magnetic, and the most basic steel used for aircraft carriers reflects the industrial level of a country.

The engine of a fighter jet has always been a weak point of the country, because the aero engine needs advanced materials and advanced processing methods, and this most basic material is the embodiment of a country's industrial strength.

This small brake pad, the same, there is no corresponding research technology in China now, so you have to use the old way, on the ordinary metal brake pads, when you come down, put the parachute, and the J-10 is a canard wing layout when the canard wing is erected, and it can also be used as a deceleration plate.

In fact, if there is this kind of carbon carbon brake pad, even if the price is high, it is necessary to replace, so that the fighter can reduce the weight of the aircraft, and the parachute can also be removed, for the fighter, every kilogram of weight is reduced, it is worth it.

"We are now walking on a road that no one has ever walked before, and we must overcome all the difficulties that must be overcome, and some minor ones can be left for later." Song Lao said: "Hurry up and let our fighters fly as soon as possible." ”

From the J-7 3 project, Song Lao also summed up the lessons and lessons, and this No. 10 project should also be developed as soon as possible.