Chapter 1244

What's more, the headquarters made it clear in the letter of intent for bidding of multi-purpose fighters that improvements should be made on the basis of mature old models, so that the troops can quickly form combat capability while reducing maintenance costs.

Northeast Airlines Group finally won the J-8 improvement project and replaced it with j-education-7max. It's not a raw thing to tell the headquarters. We just ignore your words. Some things can be done, but it's not good to say them. At least the headquarters should take care of their face.

Therefore, based on the airframe of the J-8II fighter, it's OK to replace the wing, air inlet and integrated avionics system. After all, it's just a transitional combat aircraft. It's likely to become a full-time export foreign trade aircraft in the future, and it can't be too demanding.

If it's too complicated to achieve rapid mass production and rapid train assembly, if it's delayed for several years, the 10th project will be finalized by then, and the Su-27, which is assembled with Russian imported parts, will also be in full swing.

The j-8e, the so-called transitional combat aircraft, was directly rubbed on the ground by these two light and heavy combinations before the transition.

Therefore, whether the j-8e is an improvement of the J-8II fighter or an alternative rebirth of the j-jiao-7max, the most important thing is to aim at the empty window of the second and third generation aircraft upgrading in China, and get involved efficiently and quickly to make a profit.

Therefore, this model must use mature technology from the inside to the outside, so that it can be quickly finalized, mass produced and equipped in batches, and the empty window period can be filled.

Needless to say, a series of subsystems, such as DSI inlet, strake wing and swept wing airfoil structure, and integrated avionics system, have been deeply cultivated by Tengfei group for several years, and have been repeatedly verified on Zhenlong aircraft,

As for technology and production, Tengfei has already prepared several plans.

Among other things, the reason why the engine adopts wd-58mvp instead of the more advanced wd-60 series is that the wd-58mvp is more mature and it is not difficult to mass produce.

The wd-62mpv with greater thrust is indeed very good. However, although there is no problem in the production of this aero-engine with generation 2.5 core aircraft, due to the high technical requirements, the production cycle is very long and the production capacity is still seriously insufficient.

The wd-58mvp is a typical medium thrust engine with a thrust to weight ratio of 7.5. The core engine is the second generation core engine with high maturity.

Although the performance is not very outstanding, the advantages lie in short production cycle, low production cost, fast production and self-control.

Of course, on the basis of overall maturity, the j-8e multi-purpose fighter is not without new technology applications, such as metal additive manufacturing technology. The main structure frame of the j-8e fighter body is produced by nb-985plus Metal 3D printer developed by China Tengfei.

"Of course, we still encounter a lot of problems in some key production areas..." after a general introduction of the j-8e multi-purpose fighter, Zhuang Jianye's words suddenly changed: "after all, the multi-purpose fighter and the previous high-altitude high-speed combat aircraft are two different combat concepts.

Therefore, shortening the fuselage is an inevitable choice. The problem is that shortening the fuselage brings about a very serious problem, that is, the center of gravity of the structure is broken, so it is easy to cause aircraft stall in the air.

Although we can completely solve this problem by adopting static instability design and cooperating with the fly by wire control system, at present, the fly by wire control system of this system is still under development and test, and it is difficult to realize its application in a short time, so we still use the traditional mechanical control system on the j-8e, Therefore, the problem of focus is an important difficulty we have to face... "

On this issue, Zhuang Jianye said it in detail, and the leaders of the army naturally nodded slightly after hearing this. Zhuang Jianye was right. Although the fly by wire control system is a good thing, the development cycle of an aircraft's fly by wire should be at least eight years.

After all, the preparation of the whole system must cover all the conditions of the aircraft in all States. The light test is a very complex and massive work, and it is not achieved overnight.

Therefore, among the reported indicators, the j-8e covered the fly by wire control system, but only regarded it as the later development model.

Therefore, the center of gravity of the aircraft is a big problem. Although the airframe is only shortened by 3 meters, the impact is really global.

Because of this, the body can either increase the counterweight in some places and use the counterweight to offset the 3 meters cut down; Or in the rest of the body, further reduce the weight of the structure, so that the rest of the body to reach a new balance.

It's not impossible for an aircraft to increase its counterweight, but it depends on the use of these counterweights. If the missile load or fuel load is increased, it is needless to say that these counterweights are beneficial to enhance the aircraft's sustainable combat capability, and the rest is unnecessary.It is basically impossible to increase the beneficial load with the airframe space of the J-8. Otherwise, the wing span of the j-8e multi-purpose fighter will not reach the value of 8.6m. In addition to improving the overall lift, the most important thing is to set up a large integral fuel tank inside the wing, so as to improve the fuel capacity and enhance the sustained combat capability of the j-8e multi-purpose fighter.

Since the counterweight method is not good, it can only reduce the structural weight.

This brings about a problem. If you want to reduce the weight of the structure, you need to use new materials and new technologies. The long-term experiments and verification will inevitably slow down the development progress, and then turn the excessive models into outdated models. That's not worth the loss.

What's more, the cost of new materials and new processes is also very high, which also does not meet the requirements of low price and high efficiency proposed by the headquarters.

Based on the above, subtraction must be done under the original airframe of J-8II fighter.

The difficulty of subtraction is not very high.

"Fortunately, we have nb-985plus Metal 3D printer, which realizes the one-step forming process of large titanium alloy structural parts, and the overall performance is basically the same as that of similar high-precision forgings abroad.

Therefore, we can use nb-985plus Metal 3D printer to produce 32 titanium alloy structural frames with a length of 4.2 meters and a height of 1.6 meters.

Because of the precise control of materials and the cancellation of the welding process, 32 titanium alloy frames have lost a total weight of 450 kg, and two wd-58vip turbofan engines have lost 480 kg, basically meeting the requirements of center of gravity rebalancing. "

Speaking of this, Zhuang Jianye pauses for a moment, looks at a group of technical leaders including senior researchers with a smile, and his voice rings out again: "so... Leaders, if you want to ask us about the application of nb-985plus Metal 3D printer, I really can't say.

After all, the j-8e has just come off the production line, and no flight test has been carried out yet. It's not good for me to draw a conclusion too early. Anyway, the j-8e is here now. I'd like to ask some leaders to see for themselves and see what we have done wrong. Please don't worry about face. They should be criticized and corrected, After all, the core technology of j-8e is all over it.... "

As soon as these words came out, the technical leaders of the research group, who were the same as Sichuan Opera's face changing, were ashamed that they were extremely ugly. Looking at the overbearing jian-8e, they were stunned for a long time, so they couldn't say it