"Lao Wang, this is your mistake." Mr. Gu spoke on the side: "The first time, you said that it was a sensor failure, we changed the sensor, changed the plane, or the same situation, how can you continue to insist on your point of view?" ”

"I, I." Lao Wang said me a few times, and I still felt that it was indeed me, but I was also very aggrieved, I felt that there was no problem, how could it be a failure?

"Lao Wang, let's sit down and study together, why is this data like this, isn't it better? Also, let's ask Qin Feng to study it together, okay? We are already old, and if our country's aviation industry wants to develop, we have to look at these young people! ”

After speaking, Mr. Gu said, "What about Comrade Qin Feng? ”

"Comrade Qin Feng is still on the plane."

Observe the scene and see what the plane is all about!

Mr. Gu took Lao Wang and the others and walked outside together, and sure enough, he saw Qin Feng and Wang Yang, who had already climbed to the vertical tail and studied there.

Qin Feng's feet stepped on the tail of the plane and pushed the rudder with his hands, and on the ground, the rudder was already in a locked state, of course, it couldn't be pushed.

The J-8 is an authentic second-generation aircraft, and its tail is a tall and large single vertical tail, which is the same as any MiG-23 and F-4 fighters.

In fact, the idea of double vertical tail started from the MiG-25, this aircraft should fly at high altitude and high speed, and the air at high altitude is thin, for fear that the aerodynamic torque of the rudder surface is insufficient, so the designer came up with a double vertical tail method.

As a result, the double vertical tail became popular, all kinds of twin-engine heavy fighters, almost all of them are double vertical tail layouts, such as F-14, F-15, F-18, Su-27, etc., and later, for stealth, the tall vertical tail is even worse, all of them are inclined double vertical tail layout.

Now, the J-8 is still a tall single vertical tail, although it is developed on the basis of the J-7, but its vertical tail area is at least half larger than that of the J-7.

Qin Feng's hand touched the part of the rudder surface, which has a vertical shaft, and below this shaft is the hydraulic steering gear, which accepts the command of the pedal in front and deflects with hydraulic assistance.

When I was in the cockpit, even if I used the rear-looking periscope, I didn't find that there was a significant deflection of this rudder surface, but what if it was a slight deflection?

The leading edge of the vertical tail is very wide, and the back is narrow, if the rudder only has a slight deflection, it is not visible, and at the same time, only a slight deflection can cause such a high frequency of repeated changes in the hydraulic oil line.

Qin Feng stroked and looked back to see what was going on, and suddenly, Wang Yang shouted, "Be careful! ”

Qin Feng hurriedly retracted his feet, he had already stepped on the air, and he was almost about to fall, it was more than two meters high from the ground, and he would definitely be injured if he fell.

Wang Yang wanted to catch Qin Feng, but it was too late, Qin Feng was in a hurry, and his hand grabbed the gap between the rudder and the vertical tail, the gap here is relatively wide, and it is no problem to put his fingers in!

His body tilted, and everyone sweated.

Pilots are the precious wealth of the country, every pilot is trained by the country at a huge cost, and their safety is also taken care of, if Qin Feng accidentally falls down and hurts something, resulting in no longer being able to fly in the future, it will be troublesome!

Qin Feng was also startled, he almost fell down, it was so dangerous!

He stabilized his body, retracted his fingers, saw the crumbs of the aluminum alloy skin rubbed off on his fingers, and saw that the rudder surface was inserted by his fingers, and actually trembled slightly, and suddenly, a picture appeared in front of his eyes.

As the speed of the aircraft increases, the air flow continues to blow through, separating from the leading edge of the vertical tail, and converging from the tail of the rudder surface behind, when the speed reaches Mach 1.24, under the impact of these two air currents, the rudder surface begins to shake gently from side to side!

It shook very quickly, at a high frequency, and, with its slight shaking, at supersonic speeds, the attitude of the fighter began to change gently, swinging from side to side.

This kind of oscillation is not visible to the naked eye, but it is embodied in the aircraft, which is vibration at supersonic speed!

At the same time, the shaking of the rudder surface reacted on the servo, and the oil pressure inside the servo also changed!

Thinking of this, he couldn't help but exclaim: "I thought of it, I thought of it!" ”

In his mind, the picture of the rudder surface constantly shaking rapidly and slightly kept repeating, and the more Qin Feng thought about it, the more reasonable he felt, and his heart was extremely happy.

"What comes to mind?" Mr. Gu below couldn't help asking, he had already muttered in his heart, the flutter at subsonic speed, he can make a J-8 covered with fluff, and he can do it in the rear cockpit of the trainer plane to observe closely, but the flutter at supersonic speed is troublesome.

Keep doing it? Of course not, two supersonic fighters are close to each other, how dangerous is that? Besides, we don't have a supersonic trainer at all, so where do you sit?

I can't fly.

Who would have thought that Qin Feng would actually say that he thought of it at this time? Why didn't he say he had found it?

The ground staff helped Qin Feng, jumped to the horizontal tail first, and then jumped down, Qin Feng's face was full of joy, and said to Mr. Gu: "Mr. Gu, I have thought of the reason why there is vibration at supersonic speed!" ”

After speaking, Qin Feng glanced at Lao Wang on the side, looking at his appearance of wanting to speak and stopping, Qin Feng said: "Director Wang, the problem is not on the oil road, but to solve this problem, it must be improved on the oil road." ”

Qin Feng's words stunned Director Wang, if the oil circuit is fine, then why improve it on the oil road? What the hell is going on?

Mr. Gu also became more and more confused the more he listened: "Qin Feng, what did you think of, say it and let everyone listen to it." ”

"yes, what the hell is going on?" At this time, Lao Wang didn't insist anymore, when the second time was still the time when the pressure of the oil road was constantly changing, he knew that there was something strange in it, and what was the weirdness of the entanglement, this Qin Feng actually found it?

And, listening to what he meant, he actually came up with a solution?

This really impressed Lao Wang, if this fault was solved by Qin Feng, then he would have to bow his head and apologize to him, he admired such a person!

At this time, it was already dusk, and when the searchlights at the airport had just turned on, Qin Feng told his analysis again, and everyone was amazed when they heard it.

"Qin Feng, your analysis sounds very evil."

"Besides, if that's the case, then how are we going to solve it?"