Hearing Qin Feng's analysis, Lu Lao nodded: "That's right, Qin Feng, you are not very old and have a lot of knowledge, what you said are all problems in front of us, although there are difficulties, but we must be afraid of difficulties, so that we can make progress, what do you say?" ”

In various research institutes in China, only Lu Lao has always been obsessed with variable swept wings, and has also been studying variable swept wings, although there are various technical problems, however, he will not give up this direction.

Qin Feng only analyzed it objectively, after all, the current European Tornado fighters also have variable swept wings, so if they catch up, they may be able to create fighters with this kind of wings.

Anyway, everyone is here to solve the problem, and we need to find a solution to the problem of the vertical tail rudder jitter of the J-8.

"Hey, Mr. Gu, shouldn't you go to see the nose of the plane? What to look at this tail? Lu Lao came into contact with this fighter every day, and he was already familiar with it, seeing that they went straight to the tail, he continued: "If you want to talk about the tail, the foldable pelvic fin is not bad, put it on your J-8 fighter, and you are not afraid to wipe your ass when you take off." ”

Pelvic fins, of course, are to be considered, but now it is not the pelvic fins that need to be seen, but the rudders!

In order to study the structure of this aircraft, the skin on the surface has been removed.

The entire fuselage, like a skeleton in medical research, is left with a skeleton of bones, which is the frame of a fighter jet.

The structure of the fighter is also exquisite, and in the early low-speed aircraft, the load-bearing structure of the fuselage is made into a three-dimensional structure with four edges.

In order to reduce the drag of the aircraft, outside the load-bearing frame, there are fixed partition frames, stringers and cloth skin for shaping, and these components only bear local aerodynamic force and do not participate in the force of the whole structure.

The shear forces, bending moments, and torques of the fuselage are all borne by the frame.

After that, there is the monocoque fuselage, which uses a frame and a partition to form the shape of the fuselage, while the skin is subjected to the main stresses. In this way, the skin must be strong enough to maintain the rigidity of the fuselage. So the weight is heavier, and very few aircraft adopt this structure.

In order to make the stiffness of the fuselage structure meet the increasing requirements of flight speed, it is necessary to make the skin participate in the force of the whole structure. Therefore, the modern fuselage structure widely uses metal skin, and the skin is firmly riveted with the partition frame, girder and truss to become a stressed whole, which is the semi-monocoque fuselage.

In a semi-monocoque fuselage, the girders and stringers are used to withstand the axial forces caused by the bending moment; In addition to varying degrees of axial force, the skin also has to bear all the shear forces and torques; The bulkhead is used to maintain the shape of the fuselage and withstand local aerodynamic forces, in addition to the concentrated loads transmitted by the various components, which are dispersed to the skin.

Among them, the fighters all belong to the truss fuselage, which consists of several strong girders, weaker trusses, thinner skins and bulkheads.

That is, the front and rear longitudinal frames are thick and strong, and the transverse cross-sectional beams are small, and the MiG-23 seen now is also such a frame.

Aluminum alloy is not easy to weld up, and in order to facilitate disassembly, the outer skin is directly riveted on it, and the rivets are removed, and the inside can be seen at a glance.

The engine in the tail had been dismantled and was empty, Qin Feng followed the original position of the engine, drilled in, and watched carefully.

Generally speaking, the pilot only flies, before taking off, circling the plane, mainly to check the things that should be taken away, such as the flap fixtures, such as the plug of the air intake, etc., whether the fuselage has oil leakage, and the pilot also understands the general structure of the aircraft, but is definitely not proficient.

Now, Qin Feng has reached the level of an engineer.

The overall structure of the fighter and the placement of each part inside Qin Feng remember clearly, the J-8 is improved from the J-7, which is much the same, and this MiG-23, what is the difference?

Let's take a look this time!

There is a rotating shaft under the rudder surface, which is driven by the hydraulic cylinder, and the rudder pedal stepped on under the foot presses the hydraulic oil over and injects the hydraulic cylinder to promote the rudder surface to deflection.

The tubing looks very clear.

In the air, in order to avoid failures, this kind of pipeline has more than one way, there is a backup, and the four oil pipes are neatly arranged, until the end, Qin Feng looked for it along the pipeline, and immediately found a strange place.

"What is this?" Qin Feng shouted.

Just at the end of the pipeline, before it comes into contact with the hydraulic cylinder, there is a device that looks about the size of a two-pot bottle, and the oil pipe goes in and out, which is very peculiar.

This device is not in your own oil circuit!

"I'll see." At this time, Lao Wang also came in, followed the direction pointed by Qin Feng, glanced at it, and said, "This is an oil tank, replenishing hydraulic oil, what's so strange about this?" ”

Lao Wang seems to be confident, he is an authority in this regard!

"No, I don't think so, can we take it down and see?" Qin Feng said.

"The hydraulic fluid in here is not emptied, and when it is removed, it gets dirty everywhere, forget it." Lao Wang said.

Now, Lao Wang still has an obsession, thinking that his oil circuit is fine, Qin Feng's analysis just now seems to be too unbelievable, and everything is all thought out by him, without any factual basis, not counting.

Lao Wang disagreed, he couldn't help yawning, it's night now, forget it, let's find a way tomorrow, what if it's a situation with other systems?

"No, we have to see clearly." Qin Feng said and asked, "Hey, which of you knows Russian, I touched the label on it!" ”

As he spoke, Qin Feng's hand was so forceful, and with a hiss, he ripped off the label.

You don't need to dismantle it, with this label, just look at it, fortunately it's not a steel stamp on it.

After the founding of the People's Republic of China, there was a close relationship with the Soviet Union, so the first foreign language in the country at that time was Russian, and there were many people who were familiar with Russian.

As soon as Qin Feng said this, someone immediately answered: "I will." ”

After saying that, the man ran over, took the label, and after reading it clearly, he immediately said: "This is a hydraulic damper." ”

What the? Hydraulic dampers?

Qin Feng suddenly felt happy in his heart: "I understand, I understand, the solution is so simple!" ”

Now Qin Feng has thoroughly understood how necessary it is to ask shamelessly, after all, one person is short, three people are long, and three stinkers are better than Zhuge Liang.

What's more, the Soviet people are the real Zhuge Liang, and everyone is a student.