This is not bragging, and the existing fighters in China are all born from the MiG series of fighters.

It looks like a modern Qiang-5, which is also modified with the J-6 of the MiG-19, and now the J-7 is going to be overhauled, and it has not completely gotten rid of the original foundation, the J-8 looks like it is self-developed, and it is only a double-hair large version of the J-7, and the J-7 in front of it has not made any reference, it is completely self-designed.

The shape of the J-7 looks very tall, its nose is very large, it can accommodate a large-caliber radar, and the back is a tandem two-seater, because the fighter is very tall and has plenty of space, so the front and rear two people can also be laid out up and down, not completely on a plane like before, although the staggered height is not large, it is enough to provide a certain field of vision for the pilot in the rear cabin.

It's a pity that, like the Soviet serial aircraft, this aircraft is designed so that it has almost no backward visibility, which is certainly inappropriate if it is a fighter, but the positioning of this aircraft is a fighter-bomber, it is not completely unacceptable.

Fighter-bombers, if you want to carry out air combat combat, it is impossible, it is just compared with ordinary bulky bombers, with a certain self-defense ability, can be mounted a close-range combat missile, so that when performing the mission, there is no need to accompany the escort of fighters, to say that it is absolutely impossible to go to air combat.

As long as it is not an air battle, the requirements for the field of view are not very strict.

It still uses a three-piece fixed windshield, and the front is very obscured from view, which is also criticized by all pilots, but this is also a technical decision.

If it is just handed over to the glass manufacturing department, it is not completely impossible for them to build a one-piece windshield in front, but this kind of curved windshield has a certain amount of light distortion, which is very unfavorable for the rear aiming, and must be corrected, and the front is a flat glass, which can be easily solved.

Even the American F-14, because it was born very early, has a three-piece windshield structure in front.

Now, Qin Feng's eyes looked from front to back, looking at it in turn, and then back on, it was its unique upper wing.

Domestic fighters are all medium monoplanes, that is, from the vertical direction, the wings on both sides are inserted in the middle of the fuselage, and the current fighter has wings above the fuselage.

What are the benefits of this?

Of course, it's easy to mount.

In this form, there is enough space under the wings to carry a lot of bombs, which is crucial for a bomber.

In front of the upper wing, there is the air intake, this rectangular air intake is not a narrow and long gap like the J-8, only the upper part has it, and it continues to rise backwards and downwards, and when it expands to the tail of the aircraft, it is all there.

What kind of air intake to use is decided according to the need, the air intake of this bomber does not need to be adjusted, the air intake can be greatly simplified, arranged on it, can reduce the intake of debris.

"The engine determines the success or failure of an aircraft." Song Lao suddenly sighed.

No matter what kind of aircraft is designed in China, it is stuck in the neck of the engine, and now, this kind of aircraft uses a mature Spey engine, no matter how it is imitated, when it was first imported, dozens of engines were directly imported, and they were sealed in the warehouse, which could be used at any time, which was enough to support the production of this aircraft.

"Yes, for us, the Spey engine is already the best choice, and this aircraft was designed with this engine in mind." Chen Lao said, everyone looked at the tail of the fighter plane, and they were fixedly distracted.

The progress of this kind of aircraft is so fast, once the state orders the development, it will be quickly made, because the engine is ready-made!

The tail is not equipped with an engine yet, and it will not be equipped with an engine, because this first one is used for static testing, which verifies the strength of the fuselage.

"With two engines, this kind of plane must be fast, right?" Qin Feng suddenly asked.

He asked this, which made the aircraft designers laugh, the more engines the aircraft is equipped with, the faster the speed?

This is definitely a fallacy, look at the MiG-21, the power of the engine is not strong, but the design of the fuselage is small, it still flies to Mach 2, and then look at the F-16, the thrust of the engine is very strong, and the thrust-to-weight ratio has reached 1, but it is still barely able to fly to Mach 2, which is a problem with the design of aerodynamics.

"Song Lao, is it possible to reequip our fighters with this Spey engine?" Qin Feng didn't give up and continued to ask.

If Spey can be installed on the J-10 fighter, then maybe it will be able to test fly in a year or two. And this is a turbofan, quite fuel-efficient, better than the MiG-23 engine, right?

Song Lao shook his head: "No, first, the thrust is insufficient, and second, the high-altitude ability is not strong." ”

Their J-10 fighter is designed to be a medium-sized aircraft, and the engine must have at least 12 tons of thrust, while Spey's thrust is only 9 tons, which is definitely not enough.

In addition to the lack of thrust, another problem is that the high-altitude performance of this engine is not strong, once it is at high altitude, the power drops rapidly.

The British ghost fighters used Spey engines, and as a result, the problem of weakness at high altitudes came out.

For the J-7, it doesn't matter if the high-altitude and high-speed performance is poor, after all, it is a bomber, but its own J-10 is a fighter urgently needed by the Air Force, especially a fighter with high-altitude and high-speed interception, if there is no excellent high-altitude performance, how can it meet the needs?

The turbojet-15 became an established engine because turbojet engines are inherently suitable for high altitude and high speed.

In fact, Qin Feng also knew in his heart that this engine was not suitable, but now that he saw it, he always wanted to mention it, and now, everyone's mood is the same heavy, if there is a qualified engine, how good it would be!

"This aircraft uses an outer figure-eight landing gear!" Qin Feng suddenly seemed to have discovered a new continent and shouted at Song Lao.

When Song Lao was developing the J-10, he used the landing gear of the outer eight characters, which was still very difficult, and he even planned to invite foreign countries to do it, but when he checked the price, he immediately decided to do it himself, and he couldn't afford it.

And now, the domestic Jian-7 also uses the landing gear of the outer figure-eight, maybe you can learn from here.

"Yes, we want to see how your landing gear is processed." Song Lao said.

In order to produce the J-7, the state allocated special funds to update a lot of production equipment for the 172 factory.

It can be used for reference, but it is not exactly the same, because the landing gear of the J-7 does not need to be designed to be very small, after all, it has plenty of space and load capacity, but the J-10 must be small and strong.