Chapter 712： A modification of the J-7

MiG 21, this backward second-generation aircraft, can it compete with the current advanced fighters? What a joke! Although I am satisfied with the cost-effectiveness of a second-generation aircraft like the MiG-21, it is still unbelievable to say that this aircraft can single out a third-generation aircraft.

Needless to say that others don't believe it, at this time, even Tu Jida himself doesn't believe it! Can this kind of fighter have such advanced combat power? Against the three-generation machine? In China, that is the mission of the MiG, that is, the J-8 2, and the J-7 of its own, only with soy sauce!

The air force commander of Egypt is obviously very interested, although after the fourth Middle East war, Egypt negotiated the Sinai Peninsula because of its separate peace with Israel. This method caused Egypt's position in the entire Middle East to plummet, and Egypt He didn't explain anything, he sullenly started to develop himself.

Egypt is well aware of its military gap, especially the air force, and needs an advanced fighter to replace its own old fighters. This time they came to Moscow, they really have the need to order fighters.

However, among the two Soviet fighter jets, the Su-27 is a high-end jet. Although they are interested, the Soviets are not necessarily willing to sell it. Regardless of what Andrei said, it is not so easy to order. After all, Egypt withdrew from Israel. In fact, the Soviet Union was quite dissatisfied with the war. Moreover, due to limited funds in Egypt, even the MiG 29 may not have enough funds to order.

Egypt needs a new fighter that can compete with the third-generation fighters, but also has a good cost-effective fighter!

In fact, after learning about Egypt's demand, the French Mirage immediately contacted Egypt and tried to sell the Mirage 2000 fighter to Egypt. Egypt is very satisfied with the performance of the Mirage 2000, but the price of this aircraft , they can only hold their pockets tightly and continue to make choices.

The Soviet Union's MiG-29 is already in the export sequence. Syria, Iraq and other countries have all been equipped with this fighter. However, the unit price of the MiG-29 is now around 30 million rubles. Egypt is really not too much. What a lot of money!

Therefore, they were also tempted when they heard Andre say that this J-7 can be refitted and refitted to fight against the third-generation aircraft.

Tu Kida was of course more tempted, he didn't speak, and listened to Andre's continued explanation.

"The biggest problem of the MiG-21 series fighters is the air intake of the nose. This method makes it impossible to place a large enough caliber radar, and loses the ability of medium-range air combat. In the current era, medium-range air combat has become a Air combat is the standard style, and without advanced radar, there will be a lack of awareness of the surrounding airspace." Andre said: "So, we can improve the MiG-21 fighter by changing the air intake to the nose. The belly is ventilated, which frees up valuable space in the nose to install large radars and gain the ability to fight in mid-range air combat."

Change the head! If you want the J-7 to have a good combat capability, you must improve the nose! Historically, this improvement for the J-7 only started in 1996. At that time, the J-7fs was designed, which is the way of chin intake, while the J-7mf was changed to belly intake, which completely solved the problem of the aircraft. head problem.

Originally, the radar could only be installed in the rectifier cone of the air inlet, so the size of the radar scanning antenna was strictly limited. The J-7m brought by it uses GEC Marconi's "Air Patrol" 226 type fire control radar. The operating distance is basically about 20 kilometers. It can only track/attack a single target, and cannot give the fighter jet a range of sight. Air combat capability, in the final analysis, this radar is to help short-range missiles and even machine guns better aim at the target.

"In modern fighters, the performance of the high angle of attack is the most important, so the air intake of the belly is the most suitable choice." Andre said: "Through this improvement, the defects of the original MiG 21 can be made up. superior."

Change the head! This idea has actually appeared in Tu Jida's mind for a long time, but now the improvement of our own J-7m is a small matter, and if the improvement is to air intake for the nose, it will be a major operation! Cheng Fei doesn't have enough funds to make such a toss, and now there is no suitable radar replacement!

The radar of Marconi Company is not suitable, and we have to find a new radar. Moreover, the nose becomes larger and the center of gravity of the whole machine moves forward, so it has to be rebalanced. The workload is not ordinary!

Even in the discussion of the new model, we have a model design for the air intake scheme of the fuselage We have conducted wind tunnel experiments, but in fact, it is a huge workload.

"The MiG-21 appeared in the 1960s, and the design at that time was indeed outdated. Therefore, in addition to the improvement of the nose, we can also consider improving the airfoil of the MiG-21 and use advanced aerodynamic technology to make this aircraft. The combat performance has been improved to a higher level," Andrei said.

Want to change the wings? Tu Jida's brows gradually wrinkled, is this a new plane to be designed?

"General Andre, you should know that the current trend in the development of military aircraft is to use turbofan engines. Although the initial procurement cost is higher, the later use costs are low, and the turbofan engine's fuel consumption rate is low. It is convenient for logistics maintenance." At this moment, the commander of the Egyptian Air Force said: "This J-7, no matter how the nose and wings are improved, if the engine is not replaced, it will still not be satisfactory."

Turbofan engine! Through the front fan, the external duct is blown, which directly turns into thrust, which greatly reduces the fuel consumption.

If the J-7 does not replace the turbofan engine, its performance will still not improve!

"That's a good question! If you only focus on the initial purchase cost, then the turbojet engine is very cheap. If you focus on the cost of the entire service period, the turbofan is a better choice. In fact, add a turbofan to the J-7. It is not difficult, our rd33 engine can be installed on the J-7, which can greatly improve the performance, and at the same time, the fuel consumption rate is greatly reduced, and the range of the J-7 is increased. As long as the rear fuselage is modified, it will be no problem. "

Hearing this, Tu Jida finally sucked in a breath of cold air. General Andre, you said it very easily. Do you think it is building blocks? (To be continued.)