Su-15, and J-8 2 is very similar, so much so that many people think that J-8 2 copied the Su-15, in fact, the two aircraft are different from the same destination, want to fly the plane to a very high speed in the case of limited power, interception, can only engage in this slender and long size.

Su-15, is the Sukhoi Design Bureau began to develop in the early sixties of the single-seat twin-engine all-weather high-altitude supersonic interceptor fighter, and Mikoyan is famous everywhere, Sukhoi Design Bureau's products, almost all for their own use, not exported at all, so in the international arms market, only Mikoyan is famous, few people have heard of Sukhoi, and when the Soviet Union collapsed, Sukhoi instead relied on the export of the Su-27 to survive, it is simply ironic.

The Su-15 has a slender body, a pointed nose, air intake on both sides, and two engines in the tail, which is simply the twin brother of the J-82, because of its strange size, it was given the nickname of a thin-spouted bottle by NATO, and this aircraft began to use a delta wing, but, after improvement, it finally became a double delta wing.

This is, of course, to solve another kind of problem, as long as it is a high-altitude and high-speed fighter, it will face the problem of large take-off and landing speed, and the same is true for Swedish aircraft, high-altitude and high-speed, the air resistance must be small, the aspect ratio of the wing is not enough, the lift of the wing is insufficient, there is not enough speed, how can it be held up?

The Su-15 interceptor is deployed at the front-line airfield and requires a very long runway, in order to improve this shortcoming, Sukhoi's engineers changed it to a double delta wing, so that the take-off and landing speed is reduced, and the wing blows the flaps, which finally makes this kind of aircraft not criticized by the front-line personnel.

Although the Su-15 interceptor is secretive, the US reconnaissance satellites fly over them every day, and it is not surprising that the Su-15 with double delta wings was photographed, and now that the Su-15 has long been outdated, a lot of analysis can be taken out to show off, and Qin Feng has read these documents.

It's just that he didn't have contact with his own fighter at that time, and now? Why not give it a try?

"If the Su-15 is fine, then our planes must be able to do it too." When Tu Lao heard Qin Feng's introduction, he immediately became excited: "We can do the same too!" ”

Although the specific details are not well understood, further research, blowing tunnels, calculations, etc., but the basic principles are still known, which is the basic aerodynamic data.

"If we're going to change it, it's better to keep the inside wing part still." Tu Lao continued, and after speaking, he smiled.

Not moving, this is also to reduce costs, after all, J-7 can be exported, one of the main reasons is cheap, in the process of building J-7, they have been familiar with a full set of technology, such as the wing part, the interior is composed of beams, each configuration is different, now if the interior is not moving, it means that the main beam is the same as before, it is quite easy to produce.

It's best to only move a little bit outside.

"The inner part is not moved, but the outside is changed, so that the sweep angle of the outer wing segment is reduced, and if you want to keep the wing area unchanged, the wingspan will be lengthened, so that the take-off and landing performance of the aircraft can be improved, and even the hovering performance of the aircraft can be improved!"

The larger the aspect ratio, the better the aircraft's hovering ability, and improving this data will definitely make the aircraft's maneuverability increase to a certain extent!

Tu Lao has almost seen a new world, and bringing Qin Feng to the meeting today is a major gain, everyone's thinking has been further broadened, and how to change the seventh is also a little bit clearer.

Now that the data of the entire aircraft has been thoroughly eaten, the calculation has been completed, and the counterweight has been reduced, thus providing technical reserves for the replacement of the new wing!

Sha Lao nodded: "That's right, it's okay to change it like this, but, don't forget, this will increase the drag of the plane." ”

When the MiG-21 was originally engaged in it, it was a high-altitude and high-speed fighter, which was to reduce the drag, and now the wings on both sides are lengthened, and the resistance will definitely increase a lot.

An increase in resistance will lead to a decrease in maneuverability, which is a complete contradiction.

"So, we have to wait for the Turbojet-13 to mature before we can change this airfoil." Tu Lao continued.

The drag is up, then, the countermeasure adopted is to increase the power, the turbojet-13 was originally prepared for the J-7 3, but it is absolutely no problem to stuff it into its own tail, so that the power will be increased immediately, and it is logical to improve the wing.

Tu Lao immediately understood this direction, everything can not be in a hurry, the improvement of the J-7 has been carried out little by little, and now the calculation at hand has been completed, and at the same time, he is also waiting for the maturity of the turbojet-13, and when it is all available, so that if it is improved, it will be able to greatly improve the mobility, and even have the ability to confront the F-16!

Of course, the maximum speed will definitely be reduced, but now if you want to fly high altitude and high speed, look for the J-8, the J-7 is to be transformed into a fighting fighter, and it is completely possible to improve your own side.

"If you want to go this route, it's to improve maneuverability, and in this case, in addition to the double delta wing and high-thrust engines, I think the leading edge maneuvering flap is also a must."

Since you want to change it, then simply change it thoroughly, and the opinions given by Sha Lao are more direct, let's go together!

Tu Lao frowned: "That thing, it's very difficult to process." ”

"Yes, it is very difficult to process, but this processing technology must be overcome, and you know that this is a must for future fighters."

Project 10 is a secret project, as a university professor, Sha Lao doesn't know, but he is forward-looking, this thing must be conquered, and future fighters must be available.

Listening to Tu Lao's ears, the meaning is even more obvious, his No. 10 project must definitely have a leading edge mobile flap, and when the time comes, it will still face processing difficulties, in this case, why not make up your mind now to solve this problem?

You can't bow to difficulties, and when you have difficulties, you have to find a way to solve them in order to make progress.

"Okay, then let's aim for these technologies!" Tu Lao finally made up his mind.

"Then we'll talk about it in more detail later." Sha Lao said.

The country is reforming, the university is also reforming, Sha Lao, as a professor of the university, can continue to get projects from the 132 factory, on the one hand, he can take students to do projects, on the other hand, he can also earn some funds for the university, and better equipment, of course, it is more than one stone.

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