Fighters, of course, have mirrors.

The rear-view mirror of a fighter jet, unlike a car, of course, sticks out two ears on the outside, and such wind resistance is enormous.

The rear-view mirror of the fighter is in the cockpit, specifically, on the inside of the front windshield.

Because the cockpit of the early fighter has a large back compartment, which affects the rear-view line of sight, the rear-view mirror is used to supplement the blind spot of the viewing angle, not to mention fighters like the MiG-21, even if it is the Su-27 and MiG-29 in later generations, all have rear-view mirrors, even if it is the domestic J-10 and Flying Leopard, they also have rear-view mirrors.

The F-16 does not, although it is a bubble-shaped cockpit, in fact, the pilot still desires it, except that it is a monolithic hatch and there is no windshield in front, so there is no place to arrange it.

What is this rearview mirror for? The F-16's wide bubble cockpit, won't the pilot turn his head to look back?

If it's a normal flight, it's almost the same to turn your head back, if it's under a big overload, your body is tightly pressed against the seat, and at this time, you still want to turn your head and look back? This is not a game.

In contrast, some models are more difficult, such as the MiG-21MF, which has no half-point backward vision due to the huge dorsal occlusion in the back, and even with the rearview mirrors arranged, the pilot cannot see behind and is blocked.

What to do?

At this time, it's time to go on the rear-view periscope.

True, there are also periscopes on the fighter.

The periscope is most commonly installed on the trainer aircraft, and the front and rear seats of the trainer aircraft of this era are the same height, so that the instructor in the rear cabin can't see anything in front of them when they take off and land, so they simply get a periscope to observe, although it is cumbersome, it is better than nothing.

Some are even linked, as soon as the landing gear is released, this periscope will automatically stretch out.

And the J-8 test plane, in order to be able to look backwards, also has a special rear-view periscope, the outer part is close to the front of the reinforcing frame, will not stick out a lot, at the same time, you can also see the scene behind, such as the rudder that Qin Feng wants to observe the most!

Turning on the afterburner again, the familiar feeling of pushing the back came, and the J-8 fighter continued to accelerate, rushing through the speed of sound little by little, and continued to pick up.

Qin Feng didn't look at the Mach watch again, at this time, he stared closely at the periscope, staring at the rudder behind him, and at the same time, his feet continued to rest firmly on the rudder, when the familiar vibration came from the rudder, it must be Mach 1.24.

The fuselage trembled slightly, and as he felt just now, Qin Feng's gaze was firmly fixed on the rudder surface of the tail, was it caused by the shaking of the rudder surface?

If so, you can definitely see the rudder surface swinging from side to side!

Qin Feng's body was trembling, and the rudder under his feet was also vibrating, although the entire fuselage was vibrating slightly, it could be clearly seen that the rudder surface had been parallel to the vertical tail, and there was no shaking at all!

It's so strange, is it a mistake in your own judgment?

Qin Feng took his gaze away from the periscope and looked down to see that the Mach watch had already pointed to Mach 1.35, and he had been accelerating since he started vibrating at Mach 1.24, but when he reached 1.4, he didn't see the obvious regular shaking of the rudder.

"006, report the situation." Voices came from the headphones.

"006 reports, the vibrations persist, no cause found."

"Return."

The J-8 fighter landed smoothly, and this first J-8 supersonic flight ended like this, Qin Feng sat in the cockpit and did not go down for a long time.

"Hey, Qin Feng, why don't you come down?" Someone shouted below, it was Wang Yang.

"When I flew to Mach 1.24, I felt a noticeable vibration." Qin Feng said, "However, I don't know why it vibrates. ”

While speaking, Qin Feng climbed the ladder and walked down, and Wang Yang on the side said: "Yes, everyone has discovered this problem after entering the supersonic speed, so our current test flight is carried out within Mach 1.2, and everyone is expecting you to find the problem, after all, your theoretical knowledge is the most solid." ”

Qin Feng felt a sense of frustration, that's right, of course he wanted to be able to find the problem, when he entered for the third time, he thought he could find it, who knows, but in the end he found nothing, it's really strange.

"When it vibrates, first of all, the rudder vibrates, so I thought it was a rudder problem, but when I looked at it with a periscope, the rudder surface was normal." Qin Feng continued.

Hearing Qin Feng's words, Wang Yang gave a thumbs up: "Qin Feng, you are so powerful, you can actually find that the rudder vibrates first, everyone is unknown." ”

The pilot's feet are the rudder, and when turning, cooperate with the push rod and pedal the rudder to let the aircraft change course, while in level flight, everyone's feet are off the rudder.

But Qin Feng is a special case, his feet did not leave, and he always kept it on the rudder, because according to the prior requirements, after flying to Mach 1.3, there was a turning action, and his feet were more sensitive, so he found the problem all of a sudden.

The two of them said as they walked to the back of the fighter, because they had just landed, the tail was still relatively hot, and they could feel some heat waves when they were one meter away, and they were on this side, staring at the tall single hanging tail.

Below the vertical tail is the deceleration parachute cabin, which suffered from the problem of overheating of the deceleration parachute cabin at that time, and was later solved by Qin Feng's ingenious design, and now there is supersonic vibration!

Since I first felt the flutter of the rudder, it must be the problem here, but I can't see the shaking of the rudder surface, why is it?

Could it be that my feelings are wrong?

Qin Feng kept thinking in his heart, and Wang Yang was also aside, thinking hard together, and suddenly, Qin Feng patted his head: "What about the data?" Let's look at the data! ”

When the fighter is tested in flight, it is equipped with various test equipment, and every time the flight returns, the data will be copied and handed over to the engineers for viewing.

Now that you don't know what you know, why don't you just look at the data?

Although the test flight institute does not have the same advanced means as France, the data of the fighter plane is transmitted synchronously, but it is also necessary to check the data after landing.

In 1977, the Ministry of Aerospace Shaanxi Lishan Microelectronics Company manufactured the 77-type machine, which was China's first self-designed and developed 16-bit microcomputer using large-scale integrated circuits. In addition, the domestic DJS-050 microcomputer with reference to the Intel8008 model of the United States was also successfully imitated by Tsinghua University and other units in 1977 and passed the appraisal.

Although China's computer industry started 13 years later than that of the United States, the gap between China and the United States has narrowed to six years thanks to the hard work of the older generation of scientists. (Looking at the full import of chips in later generations, it is embarrassing.) ）

Now, in the test flight institute, there is a 77-type computer, and after the data is exported, Qin Feng follows everyone to look at the dense data.

Wang Yang already felt that his head was a little big.