Qin Feng's mouth is full of advanced technology, his horizons have been broadened, but the domestic technical strength is here, and now a major problem that needs to be solved in China is to remove the counterweight of the J-7, which needs to be obtained through careful calculation, after removing the counterweight, even if it is one less cumbersome, it can improve the mobility of the J-7 by a step.

"We can't do this technology for the time being, at least we have to wait until the plane in the test flight institute accumulates experience, and then we will launch it later." Tu Lao said: "Now, we have to go step by step, the pace is too big, we don't have the ability." ”

Veteran Tu pulled the meeting back to the topic, made a comprehensive calculation of the current Jianqi, and then found a way to improve it, and then, it was time to coordinate and assign tasks.

This is the first time that Qin Feng has really gone deep into a scientific research task, he listened very carefully, looked at the old experts present, and the problems discussed were also very in-depth.

"Let's go, we've been talking for a morning, let's go eat first." Tu Lao looked at the results of the morning, very satisfied, 132 factory now has a foreign trade project, so you can also make a big deal, please have a meeting here, of course you have to eat a delicious meal at noon.

"Lao Tu, you are beautiful now." As soon as the meeting ended, an old man stood up and spoke to Tu Lao.

Tu Lao patted each other's shoulders: "We are all the same, this time, the expenses you asked us for exceeded the budget." Tu Lao smiled.

"Lao Sha, let's go, hurry up, there is your favorite sweet and sour fish, and if it's slow, it will be eaten by those boys."

This name is Lao Sha, is the famous Professor Sha of Western University of Technology, he is an authority in the field of pneumatics, and his level is much higher than that of Tu Lao's 132 factory research laboratory, and at the same time, in the common aviation industry for decades, the relationship between the two is getting closer and closer.

"Professor Sha, what I just heard from you is very professional." Qin Feng followed aside, leaned over and said.

"Young man, the ACT technology you just mentioned is very far-sighted, although we can't reach it now, but in the future, we will definitely work in this direction." Professor Sha also knew Qin Feng and said to him.

"That's right, he's our best test pilot, Qin Feng, have you heard of it?"

Hearing what Tu Lao said, Professor Sha's eyes suddenly widened: "Of course I've heard that you are a general in our aviation system." ”

A few people walked and talked as they went, and entered the restaurant next to them, where the meals had been put on the table one after another.

"Professor Sha, if you don't use the ACT technology I mentioned, it's not easy to continue to improve the maneuverability of our J-7 aircraft." Qin Feng said.

In the past, Qin Feng suggested the upper edge of the mobile flap, but the difficulty of processing that thing was too high, so the factory still didn't do it, if it was to be done, it would definitely need the help of their professors, and without the participation of the Western University of Technology, the people of Factory 132 could not completely handle it.

"Yes, it's hard to improve." Professor Sha said: "However, there is no way, to improve mobility, mainly from the wings, Qin Feng, you can tell me about it." ”

Professor Sha was questioning Qin Feng, and Qin Feng immediately spoke: "The current popular wing is the cut delta wing, plus a large side wing, using the side wing to pull the vortex and improve the performance of the large angle of attack, and the variable sweep wing is outdated." ”

There are so many kinds of wings, and now the third-generation aircraft are beginning to move closer to the direction of the side wings, whether it is the United States or the Soviet Union, they are all taking this path.

"So, what about before the edge strip wing?" Sha Lao asked.

Before the edge wings? Isn't it a variable sweep wing? That's an ordinary delta wing, right?

"A special airfoil, you know? For example, the wings of the Swedish fighter are very peculiar. ”

Hearing Professor Sha's words, Qin Feng immediately understood: "Are you talking about double delta wings?" ”

Nowadays, many aircraft are delta winged, which is the most common airfoil.

The wing is the most direct reason why the aircraft can fly, which of course has gone through the process from simple to complex, the early propeller aircraft are straight flat wings, in order to achieve the jet, add a swept angle is the swept wing. Ordinary swept wings can't solve the problem of saber dance and root strength, so they gradually thicken the roots, so that they evolved into delta wings.

Delta wing, that is, the wing of the fighter is a triangular shape, this delta wing includes a lot, the now popular cut delta wing, can also be regarded as a kind of delta wing, in addition to this, there are other mirage 2000 tailless large delta wing, as well as a relatively niche double delta wing, the side wing is the details of the delta wing strengthened. Even the trapezoidal shape of the later F22 can be considered a stealth version of the delta wing.

It can be said that if you divide a large family, except for the variable sweep wing, it can be called a delta wing.

The double delta wing is a special case of the delta wing, and its large wing can be regarded as composed of two different delta wings, according to different conditions, the double delta wing can be convex outwards or concave inward.

As an expert in pneumatics, Sha Lao suddenly put forward this proposition when he was eating, and when he said this, Tu Lao's eyes lit up.

Change the wings!

Qin Feng also mentioned this proposal, but Qin Feng just said that he would change the leading edge mobile flap, and how to change this delta wing must be a super professional talent.

Sha Lao said it, double delta wings.

In this era, there are quite a few aircraft that use double delta wings, and in addition to the Swedish Saab 35 Dragon, there is also the Su-15 interceptor.

Hearing Sha Lao's question, Qin Feng immediately said the answer, double delta wings! Can this airfoil solve the current problem?

"Sweden has always been a neutral country, they have to rely on their own ability to solve problems, so their own defense industry is very strong, their Saab company, developed a lot of aircraft, Saab 35 is one of them, it needs to meet their high-speed interception requirements when it is designed, but it also needs to have the ability to take off and land short, so there is this double delta wing." Sha Lao was quite happy when he heard Qin Fengneng say it, and immediately added it.

However, Saab 35's double delta wing is more bizarre, the inner wing part is more like two large side strips, which is simply the ancestor of the side strip wing, but the engine air intake is also inside, which is quite wide, so it can't pull out any vortex, in short, the shape is quite alternative.

"In addition to the Saab 35, the Su-15 is also such an improvement route, and I think the Su-15 means more to us." Speaking of this, Qin Feng remembered a foreign language document he had seen, and he immediately came to his senses.

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