The strongest pilot ever

Chapter 72 The Physics of Cobra Maneuvers
72 Physical Process of Cobra Maneuvers
The reason why Chen Fei wanted to learn the cobra maneuver was not a momentary impulse, but the result of careful consideration.

Regarding the Cobra maneuver, there are two theories. One is that it is flashy and has no effect at all in modern air combat, but there is another argument that it should still have a great effect in close-range air combat. Where is it? One is correct, and there has been no conclusion. Fade Chen wants to practice it and verify it himself.

Fade Chen also thought about the Cobra maneuver secretly. He believed that the post-stall maneuvers of the aircraft - "Pugachev Cobra", "Tail Impulse" and "Herbst" maneuvers are all typical post-stall maneuvers. All have the ability to point quickly, and can be used not only as an offensive tactical means in close-range air combat, but also as an effective defensive tactical means.

In summary, the post-stall maneuver has the following tactical implications:
The effectiveness of the post-stall maneuver depends largely on the air combat situation, that is, on the relative position of the enemy aircraft, the flight speed, and the capabilities of the weapon system.

When using a post-stall maneuver, especially a Pugachev Cobra maneuver, the maneuvering of the target has little effect on the aiming of the aircraft's nose.Because the state time of this maneuver is very short.

In actual close-range air combat, when our aircraft finds an enemy aircraft that is close to the rear during maneuvers such as snake turns or circling, we can use the "Pugachev Cobra" maneuver to quickly decelerate at the right time, so that the enemy aircraft can "rush to" The front puts our aircraft in a favorable attack position.

In an air combat using a full range of missiles, post-stall maneuvers can be used to attack enemy aircraft in a larger range, which can provide pilots with more opportunities to launch missiles than conventional maneuvers.

When our aircraft is attacked by enemy missiles, we can quickly change its attitude by using post-stall maneuvers to reduce the possibility of being attacked.

But whether this is the case, Fade Chen doesn't know, so he wants to practice it himself.

Of course, the more important point is that the process of learning Cobra maneuvers is actually the process of honing flying skills.

His current flying skills have reached a certain level, which is already very high, but if he wants to go to the next level, he needs an opportunity, just like those masters who practice kung fu, they need to break through a very difficult bottleneck. He has a faint feeling It feels like the cobra maneuver can help her break through that bottleneck.

But unfortunately, Master He Xiaoyao only gave him one chance.

Therefore, he must be fully prepared.

Chen Fei's preparation is to go to the library, look for information, read, write articles, first understand the mechanism of cobra maneuvering theoretically, and combine theory with practice.

After reading a few books and combining his previous understanding, Fade Chen began to write and draw in his notebook. Finally, he drew a picture, and then wrote in his notebook. After calculation, I came up with Figure 1 , Figure 1 shows the dynamic characteristics of a statically unstable aircraft at a supercritical angle of attack.The upper figure in Figure 1 shows the moment characteristics of the statically unstable aircraft when the maximum negative deflection of the horizontal tail φmax =-20 degrees.When flying at a high angle of attack, the horizontal tail is manipulated. When α < α balance max, φmax = -20 degrees, the aerodynamic moment is positive, the aircraft heads up, has an angular velocity ωZ, the angle of attack increases, and ωZmax is obtained at the balance point.When α>α balance max, the aircraft continues to increase the angle of attack by inertia, but at this time the aerodynamic moment of the aircraft is negative, and ωZ becomes smaller and smaller until ωZ =0. At this time, the angle of attack no longer increases, and the corresponding angle of attack is Dynamic maximum angle of attack αdynamic max (longitudinal moment unbalance mZ ≠ 0 ).This angle of attack is the maximum angle of attack that the Cobra can achieve while maneuvering.When mZ =0 (longitudinal moment balance), the corresponding angle of attack is the maximum angle of attack αbalance max of the static balance. The "Pugachev Cobra" maneuver produces a dynamic high angle of attack, not a balanced high angle of attack. The maneuvering mechanism of "Pugachev Cobra" is: (1) large up moment; (2) down moment mZ <-0.05; (3) rapid change in angle of attack, α can reach 70
He had just finished writing these things when a teacher came over and patted him: "Fade Chen, it's getting late, we're going to close, come back tomorrow?"

Uh?
Fade Chen was taken aback.

After regaining his senses, he turned his head and looked to the side. Sure enough, it was already pitch black. He looked at his watch, and it was almost ten o'clock.

"Okay, thank you, Teacher Yang, I'll be leaving now." Fade Chen stood up hurriedly. He was about to put some books back on the shelf when the teacher said, "Give me the books, please?"

"Okay, thank you Teacher Yang." Fade Chen hurriedly handed him the book.

The teacher took those books and looked at them, frowned, and asked in surprise, "Fade Chen, what do you think these books are?"

"Oh, let me calculate the physical process of the cobra's maneuver!" Fade Chen quickly replied.

"The physical process of the cobra's maneuver?" The instructor was dumbfounded. After recovering, he looked at Fade Chen's notebook and asked, "Have you figured it out?"

"It's almost figured out."

"Let me see!" Teacher Yang said, before he finished speaking, he picked up Fade Chen's notebook and read it: "The mechanism of Pugachev's cobra maneuver is: (1) the upward moment is large; (2) ) The pitching moment mZ <-0.05; (3) The angle of attack changes rapidly, and α can reach 70”

The teacher looked at the result directly, and after reading it, he raised his head and stared at Fade Chen.

"What's the matter, Teacher Yang, did you make a mistake?" Fade Chen was taken aback.

After recovering, Teacher Yang didn't say anything, but just patted Fade Chen on the shoulder and nodded.

Fade Chen returned to the dormitory inexplicably.

He was a little tired and fell asleep.

But before falling asleep, his master He Xiaoyao found the dormitory.

"Fade Chen, I heard you wrote something, let me take a look?" He Xiaoyao said straight to the point.

Fade Chen hurriedly got out of bed and found the notebook.

The more He Xiaoyao watched, the more shocked he became. As he watched, he slapped the table with a bang: "Damn, that's what happened! I just said why I always failed before!"

He Xiaoyao is naturally able to fly a cobra, and his level is very high. At first, he went to Lao Maozi to study and learn from others. He was taught by others. They just told him what to do, but why did he do this? The old man couldn't tell why, but now Chen Fei.
Hey!
He even wrote out the physical process of cobra maneuvering.

This theory combined with his experience
Damn, everyone can learn Cobra maneuvers in the future!

The difficulty of this maneuver will be reduced by at least half.

"I'll take the notebook away first, you have a good rest, tomorrow morning I will teach you how to maneuver the cobra!"

He Xiaoyao looked at it for a while, then closed his notebook and said to Fade Chen.

"Ok."

After He Xiaoyao left, Fade Chen continued to sleep.

His heart was very calm, and he fell asleep after a while. The military training for more than a year made his calm heart even more stable.

In the early morning of the next day, He Xiaoyao first explained to Fade Chen the essentials of the Cobra's maneuver, and conducted a ground drill with him. After staying there was no problem at all, he took Fade Chen to the plane, and in the designated airspace, He demonstrated it to Fade Chen first, and then released the permission to let Fade Chen come.

Because this is the first time training, so the height is very high, in case of accidents, He Xiaoyao can recover in time.

"Next, you can try it again. Don't be too nervous, just relax. No matter what problems arise, I can help you solve them. Your master still has this ability." He Xiaoyao encouraged Fade Chen.

"Okay, thank you Master!"

Fade Chen smiled, and then began the first operation. He first powered-trimmed the aircraft at the predetermined altitude, and flew horizontally at a gauge speed of 310-420 km/h.

After that, he disconnected the switch of the fly-by-wire system and the switch of the angle of attack limiter, quickly pulled the lever to the end, and kept the nose up to 110-120 degrees for a short time, and the angle of attack was 90-95 degrees.

At this time, the surface speed is about 300 km/h.

When the nose starts to sink, put the push rod to the neutral position, and increase the engine to the maximum state, so as to form the yaw control moment and prevent the deviation from the course.

When the aircraft state is close to level, switch on the fly-by-wire control switch and the angle-of-attack limiter switch to adjust the aircraft state, and the duration of the whole action is about 5 s.

After the action, the surface speed is about 120-130 km/h, and the flight altitude is slightly higher than the initial state, but the change is not large.

The plane stood up like a king cobra, and then returned to level flight.

Fade Chen's first operation was successful!

I am!

He Xiaoyao, who was sitting in the back cabin, was not calm anymore. He prepared more than a dozen plans today to deal with various situations that Fade Chen encountered, but——

But none of them can be used!
There was no sound on the tower, and all the staff on duty were stunned by what Fade Chen just saw. The first time they learned the Cobra maneuver, they succeeded for the first time, and there was no stall?
Fade Chen, Fade Chen, do you want to be so perverted!

There was a burst of wailing in everyone's heart!
You are so outstanding, doesn't it seem that we are too mediocre!

(End of this chapter)