The second fighter, that is, the imitation of the former Soviet Union's MiG-induced "Baid-Wo speed fighter", is a kind of nose-intake, the world's 5 fighter is as typical as the Americans' 5 fighters, and it is also the first supersonic fighter produced by China that can reach twice the speed of sound.

In China, the production of this fighter is very large, but because the initial aerodynamic shape design of this aircraft is very good, in the air hovering performance and acceleration, sprint, in fact, it is not weaker than the current international third-generation fighter, and the potential for modification is very large, the aerodynamic shape is excellent, so this fighter from the sixties, in the world was born countless improved MiG, and huge modification potential, This made the MiG the most produced aircraft in the world after World War II. And in today's world, when the second-generation fighters have basically been retired, there are still a huge number of MiGs in service with the air forces of many countries in the world.

However, this fighter is not without its shortcomings, the biggest disadvantage is that the aircraft is not equipped with radar, and it can only fly during the day and carry out combat missions.

Although the later improved model of the J-7 fighter has been equipped with radar, because of the limitation of the narrow air intake head cone of the J-7 fighter, in order to ensure that the engine can obtain enough oxygen to work, the volume of the radar must be strictly limited, and the volume is limited, so the performance is naturally not very good.

Therefore, the radar power on the J-7 fighter has a close detection distance, limited by the size of the radar, and the discovery distance is only about one kilometer, compared with other fighters of the same era that have a detection distance of hundreds of kilometers, MiG is a very serious myopia, and needs the guidance of ground radar, and then rushes up to "fight bayonets" with the other side

And after entering the eighties, another very fatal shortcoming of this aircraft was revealed: there were only a pitiful four weapon hardpoints on the plane!

In modern anti-aircraft combat, it can be said that the few weapons carried are at a very big disadvantage. However, fortunately, the biggest advantage of the J-7 fighter is that it is cheap, compared with the third-generation fighter that often costs tens of millions of dollars, the J-7 fighter is too cheap, and the J-7 fighter with thousands of sorties by the Continental Army, if it is a coastal combat mission or a local air defense mission, it can be exchanged for quality in quantity.

The reason why the military proposed to improve the radar of this fighter is naturally out of the reason for the short-sightedness of this fighter, and they hope that under the premise of not changing the aerodynamic layout of the existing Jian-7 fighter, although they are developing a fighter based on the MiG guidance fighter with Pakistan, the military obviously does not intend to purchase and use this fighter by itself, so that this fighter with myopia can fly farther and see farther, and its combat capability will naturally be stronger.

Although in the new era, this aircraft belongs to the category of cannon fodder aircraft, but even if it is cannon fodder, it is good to kill a few more people, right? This is probably the original intention of the military to consider adding a better radar to this aircraft.

But out of the mood for this aircraft "cannon fodder." Considering this unchanged essence, the Air Force naturally cannot spend too much money for a "cannon fodder machine", so the performance requirements for the development of radar under the Alice Group are: after equipping this radar, the J-7 fighter has all-weather and all-airspace combat capabilities, the weight of the whole radar is less than a kilogram, the volume is less than 0, and the distillation cubic meter, the use height is between sub-concave knife meters, the search and tracking range is positive and negative approximate degree angles, the detection distance of the radar is between kilometers of the blade, and the tracking distance of a single target is not less than 55 kilometers. The tracking angle accuracy is not lower than that of the average maintenance interval when it is greater than that of the wedge. Overall, it is much better than the Bu-7 radar currently used by the J-7 fighter.

All these requirements show that this aircraft is a real cannon fodder aircraft, and it costs the least amount of money to achieve the most ideal effect.

The overall radar system only has a weight limit of 80 kilograms, which is even slightly lighter than the counterweight weight used for the nose of the J-7 fighter before, and this volume requirement is exactly the internal volume of the air intake head cone, so that there is no need to improve the overall aerodynamic shape of the aircraft at all. Sure enough, it is to spend the least amount of money to do more things.

For cost considerations, the pulse Doppler system is adopted, rather than the phased array radar technology developed by the Alice Group, otherwise the radar guy will be too expensive, more expensive than a J-7, rather than the backward single-pulse system used on the current J-7 fighter; Requires the ability to shoot downward.

It is also on the cost-saving side...... Second, it is required that the Lei Tai does not need to be responsible for the environmental control system,! Need less" to meet the requirements of radar air cooling and heat dissipation, so that there is no need to change the aircraft's environmental control system, and if the set can not be equipped with special radar display equipment, the radar needs to display the information directly on the aircraft's head-up display system, it would be better, not only simplified the cockpit equipment, but also more aspects of viewing, did not change the pilot's observation habits, and at the same time the training modification is also easier.

At the same time, the radar should have the ability to use the vertical axis to launch the attack capability, so it is necessary to increase the radar follow-up aiming method, so that through the follow-up of the radar, the air-to-air missile with the ability to launch the attack capability of the vertical axis can be launched off-axis. Enhance the combat capability of missiles in complex environments. In addition, it is also necessary to have a good downward-looking performance, so that the Jian-7 fighter equipped with the new radar has the ability to deal with low-altitude targets, and give full play to the Jian-7 fighter's territorial air defense and interception capabilities.

"What do these numbers say? After Zhang Lan looked at the performance data of this radar for a while,

"It means that the performance of this radar is much better than that of the British Marconi company or the Italian Siyang 7 multifunctional radar used on the current export Jian-7 fighter, but in terms of price, this radar can only be their little brother." Little Beibei said on the side.

This description is very appropriate, Zhang Lan nodded with admiration, he didn't expect that even Xiao Beibei, a girl, actually had such a comprehensive understanding of the military aspect, and she could trust the performance of various electronic devices used on various aircraft, "They do think so, if we want to build this aircraft, the difficulty is not ordinarily high." ”,

"It's a pity that Alice Group can't produce high-performance military jet engines now, if possible, I believe these guys will not let go of this opportunity, the engines used by the military are not very good, even engines like turbojet, they have to use Dawn pouting, obviously for the domestic military's "congenital heart disease" is very disdainful.

"There is no way to do this, after all, the time of our founding is too short, the time for the development of aero engine manufacturing industry is even shorter, and there is no complete process from propeller engine to turbojet engine to turbofan engine, compared with the Western world that has gone through seventy or eighty years of technology accumulation, our experience is pitiful, and we can achieve the current results, in fact, it is quite good, and in recent years, with the improvement of the country's financial situation, the technology in aero engines, the domestic has developed relatively fast." Zhang Lan said.

Zhang Lan is not like the so-called "angry youth" who are like those so-called technology-only and data-only theories. We all complained vigorously, and if the data is not good-looking, you can only commit suicide by jumping off the building, but you can comment on this issue from a rational height.

"That's the list, what do we have next?. Alice asked.

"Well, of course, next, although the money is less, the R&D funds are only 10,000 US dollars, but I think the amount of this funding should be relatively sufficient, right?" Zhang Lan nodded and said.

"If you develop such a radar with low performance, this amount of money is enough." Alice nodded, she was quite clear about the company's various expenses and the required R&D funds, "But we don't make much money with this little money." ”

"For you, any project that is less than $100 million this year is not profitable." Zhang Lan replied with a smile.

"That's it!" Alice beamed with pride.

"If possible, by the way, develop a photoelectric reconnaissance system, in terms of optoelectronic technology, we don't seem to have anything that can attract the military, this thing, but it is also a rich market, I can't help but think of the important role of the optoelectronic system in modern warfare, Zhang Lan said.

In addition to reconnaissance, the optoelectronic system also has the incomparable advantages of this radar system: in the face of radar, stealth aircraft may be invisible, but in front of the optoelectronic system, expensive stealth aircraft is actually no different from an ordinary aircraft, and because of the unique aerodynamic shape of the stealth aircraft, it is easier to be identified by the photoelectric reconnaissance and fire control system, it can be said that the optoelectronic system is a great weapon against stealth aircraft.

"This work is already being done." Alice nodded, "Although I don't know when it will succeed, according to the current research steps, the latest results should be available soon." ”

"So fast?. Zhang Lan's surprise.

"More than that" is waiting for you. "Alice, this girl mysteriously sold a pass at this time.