The original design of the J-8 is a double-hair large version of the J-7, using the layout of the classic delta wing, this triangular wing has a large sweep angle, so that the overall drag is small, with excellent supersonic speed and climb performance, it is precisely because of this layout that the small J-7, with a thrust engine of five or six tons, has achieved the flight target of Mach 2.

After the J-8 uses two engines, the top speed has reached Mach 2.3, as an interceptor, it is qualified, but if it is used as a fighter, it is not suitable, the horizontal maneuverability of this aircraft at medium and low altitudes is poor, the lateral stability is poor, and the take-off and landing speed is larger.

Especially the last one, even if it is only with four missiles, the take-off speed is very large, if you want to continue to increase the payload capacity, then the take-off speed required is even greater, the original more than 300 kilometers per hour, absolutely not low, if it is increased to 400? I don't know anything else, at least the tires below must be unbearable.

This is caused by its wing, the wing area is small, the wing load is large, then, if you want to improve it and make it have better performance, it is to replace the wing with a larger area.

This is the design idea of J-8C, generally speaking, the replacement of the wing is a big project, and it can even catch up with the newly developed aircraft, after all, as soon as the wing changes, the overall aerodynamic layout will all change.

However, they have already made up their minds and must change!

Due to the need to take care of the supersonic performance, they can not use the double delta wing of the J-7E, but can only use the way of enlarging the wing, which can greatly reduce the wing load of the aircraft, so that the lateral stability, horizontal maneuverability, and landing performance of the aircraft have been greatly improved.

"However, if you add wings, it will also lead to an increase in drag, so we have to use a more thrust engine, the Turbojet 14, which is our choice, although there is still a lot of uncertainty." Mr. Gu continued.

By now, everyone is already clear about the law of aircraft research and development, and the development of engines must be earlier than airplanes!

The engine research and development cycle is very long, there are many problems, even if I didn't know before, after the failure of the turbofan six, everyone agrees with this point of view, the turbofan ten is put forward in this case, to first pre-study the core machine, take the right path of development.

And what about the Turbojet-14? This engine is also developed by Shenyang, and they plan to use a hybrid method to combine some of Spey's technologies with some of the technologies of the turbofan six, which has actually failed once on the turbofan six, but they have no other way.

If the J-8 wants to improve, it must be rejuvenated, the power of the turbojet 7 is insufficient, and the turbojet 13 is also insufficient, and the thrust must be greatly increased, so it can only be pinned on the turbojet 14.

Under the abundant power, the performance of the J-8C will also have radical changes, for example, its range will reach 2500 kilometers, and the maximum external plug-in will reach 5 tons, so that it is not only a fighter, but also a ground attack at a critical time!

"This technical risk is very high." After listening to Mr. Gu's explanation, Qin Feng couldn't help but sigh.

"Yes, it's very risky, but we have no choice, we have to fight." Mr. Gu said.

Mr. Gu didn't go into details, Qin Feng knew some of the unspeakable secrets, Qin Feng knew about them when he was in the capital.

On the one hand, it is naturally J-10, J-10 is still under development, General Zhang made a decision, let Shenyang do a good job of J-8 first, and then said, watching the third-generation aircraft fall into Chengdu, they are unwilling, they have to find ways to make the performance of J-8 in their hands continue to improve, and finally reach or even exceed the level of J-10, there is no qualified engine, absolutely not.

On the other hand, it is the Air Force's current interest in the Su-27, once the Su-27 is purchased back from the Soviet Union, then the J-8 will have no room for survival.

After all, the J-8 can do it, the Su-27 can do it, the J-8 can't do it, the Su-27 can also do it, for example, air interception, the Su-27 has R27 missiles, and there is absolutely no problem with long-distance interception, at the same time, the Su-27 also has outstanding mobility, and it can also rush up for fighting, and its plug-in is also quite large, and the range is very long, so to speak, after the Su-27 comes in, the J-10 project is very dangerous, and the J-8 has no meaning at all.

Thinking of this, even if Mr. Gu is about to retire and leave his job, he is still worried. Of course, in front of Qin Feng, he can't say anything more detailed, this is Shenyang's own business, and it has nothing to do with Qin Feng, unless Qin Feng can go to Shenyang, the chief test pilot of J-8C must be him.

"By the way, then the air refueling technology we are testing now will definitely be used in this J-8C, I strongly recommend that we must engage in an air refueling tube that can be retracted." Qin Feng also diverted the topic.

Now, the in-flight refueling of the J-8 is in the process of test flight, although there are some problems, but everyone believes that they will be overcome in the end.

J-8's air refueling machine is improved on the basis of J-8 2, except for the installation of air refueling tubes, there is almost no change, the air refueling tubes are still fixed, in the current situation, of course, it can be bearable, after all, it is an experiment, but, if it is mass-produced in the future, and then do this, the pilot will definitely complain, that thing, too obscuring the line of sight.

Of course, there are a lot of fixed ones, such as phantom machines, many of which are fixed, but if it is redesigned, it can definitely free up the internal space on the right side of the nose, and it is definitely beneficial to make it a form that can be retracted.

Pilots are the most welcome, with this air refueling tube, can increase the flight time in the air, help to carry out the flight mission, but at the same time, it is too obscured vision, if the target is in the blind spot of the field of vision, it will make the pilot delay the fighter.

However, after hearing Qin Feng's words, Mr. Gu only smiled bitterly and shook his head, don't look at that small air refueling pipe, in fact, there are many doorways inside! Although the team sent by Shenyang was a team of several people led by Lao Yang, in Shenyang, almost the entire research institute fought for a long time before it was refitted.

Now, it can be used first, and then say, if it can be retracted and put into the form, then the technology required is greater, now, make do with it, install it when you need it, and remove it when you don't need it, isn't it?