72 Physical Process of Cobra Maneuver

The reason why Chen Fei wanted to learn cobra maneuver was not the impulse of a fever, but the result of careful consideration.

There are two statements about cobra maneuver. One is that it is flashy and has no effect in modern air combat, but there is another statement that it should still play a great role in close air combat. There has never been a conclusion on which one is correct. Chen Fei wants to practice it himself and verify it himself.

Chen Fei also secretly thought about cobra maneuver. He believed that the aircraft's over-stall maneuver - "Pugachev Cobra", "tail rush" and "Herbst" maneuver are typical over-stall maneuver actions, and they all have the ability to point quickly. In close air combat, it can not only be used as a tactical means of offense, but also as a tactical means of effective defense.

To sum up, stall maneuver has the following tactical significance:

The effectiveness of stall maneuver depends to a large extent on the air combat scenario, that is, on the relative position of the enemy aircraft, flight speed and the capabilities of the weapon system.

When using stall maneuvering, especially when using the "Pugachev Cobra", the target maneuvering has little impact on the aiming of the aircraft head. Because the maneuvering state time is very short.

In actual close air combat, when our aircraft finds enemy aircraft with a close distance behind during maneuvering such as serpentine turning or hovering, we use the "Pugachev Cobra" maneuver to quickly slow down, which can make the enemy aircraft "rush to the front" and put our aircraft in a favorable attack position.

In air combat using all-around missiles, the use of stall maneuvering can attack enemy aircraft on a larger scale, which can provide pilots with more opportunities to launch missiles than conventional maneuvers.

When our aircraft is attacked by enemy missiles, using stall maneuver can quickly change its posture and reduce the possibility of attack.

But Chen Fei didn't know whether this was the case, so he wanted to practice it himself.

Of course, more importantly, the process of learning cobra maneuvering is actually a process of honing flight technology.

His current flight skills have reached a certain level and are already very high, but if he wants to go to the next level, he needs an opportunity. Just like those masters who practice martial arts, he needs to break through a very difficult bottleneck. He has a vague feeling that 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, find information, read, and 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, Chen Fei started writing and drawing in his notebook. Finally, he drew a picture, and then wrote in the notebook that after calculation, I got the figure 1. Figure 1 shows the dynamic characteristics of the static and restless aircraft at supercritical angle of attack. In Figure 1, the above figure shows the torque characteristics of the static and restless aircraft at the maximum negative skewness of the flat tail φmax = -20 degrees. When flying in a large angle of attack, the flat tail is controlled and when αα balanced, the aircraft continues to increase the angle of attack by inertia, but at this time the aerodynamic moment of the aircraft is negative, and wz becomes smaller and smaller until wz = 0    ,

At this time, the angle of attack no longer increases, and the corresponding angle of attack is the dynamic maximum angle of attack α dynamic max max (longitudinal moment imbalance mz ≠     0). This angle of attack is the maximum angle of attack that can be achieved when the "Cobra" is maneuvering. When mz = 0 (longitudinal moment balance), the corresponding angle of attack is the maximum angle of attack α equilibrium of attack α max. The maneuvering of "Pugachev Cobra" is generated by dynamic large angle of attack, not equilibrium large angle of attack. The mechanism of "Pugachev Cobra" maneuver is: (1) a large upward moment; (2) a downward pitch moment    mz

He had just finished writing these things when a teacher came over and patted him: "Chen Fei, it's getting late, we're going to close the door, come again tomorrow?"

Well?

Chen Fei was stunned.

After coming to his senses, he turned his head and looked at the side. Sure enough, it was already dark. After looking at his watch, it was about to be ten o'clock.

"Okay, thank you Teacher Yang, I'll leave now." Chen Fei hurriedly stood up. He was about to put a few books back on the bookshelf, but the teacher said, "Give me the books?"

"Okay, thank you Teacher Yang." Chen Fei hurriedly gave him the book.

The teacher took the books and read them. His eyebrows froze and asked in surprise: "Chen Fei, you read these books..."

"Oh, I'll calculate the physical process of cobra maneuvering!" Chen Fei quickly answered.

"The physical process of cobra maneuvering?" The instructor was stunned when he heard it. After coming to his senses, he looked at Chen Fei's notebook and asked, "Did you figure it out?"

"It's almost done."

"Let me see!" Teacher Yang said, before he finished speaking, he picked up Chen Fei's notebook and looked at it: "The mechanism of Pugachev's cobra maneuver is: (1) the upward tilt torque is large; (2) the downward tilt torque    mz

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

"What's wrong with Teacher Yang, are you doing it wrong?" Chen Fei was stunned.

After coming to his senses, Teacher Yang didn't say anything, but just patted Chen Fei on the shoulder and nodded.

Chen Fei returned to the dormitory for some reason.

He was a little tired and fell asleep.

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

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

Chen Fei hurriedly turned over and got out of bed and found the notebook.

He Xiaoyao became more and more shocked as he looked at it. As he looked, he slapped the table: "Damn, so that's the case! I just said why did he always fail to succeed before!"

He Xiaoyao naturally can fly cobras and has a very high level. At first, he went to study abroad with the Russians. He taught him step by step. People just told him what to do, but why is this happening? In fact, the Russians can't tell anyone, but now Chen Fei...

grass!

He actually wrote down the physical process of cobra maneuvering.

This theory plus his experience...

Damn, everyone can learn to be a cobra motor 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. I'll teach you how to move the cobra tomorrow morning!"

He Xiaoyao looked at it for a while, closed the notebook and said to Chen Fei.

"OK."

After He Xiaoyao left, Chen Fei continued to sleep.

His heart was very calm and he fell asleep in a short while. The more than a year of military training made his already calm heart more calm.

The next morning, He Xiaoyao first explained the key points of cobra maneuver to Chen Fei and conducted ground drills with him. He stayed at all without any problems. Then he took Chen Fei on the plane. In the designated airspace, he first demonstrated it to Chen Fei, and then let Chen Fei come once.

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

"You try it now. 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 cheered Chen Fei up.

"Okay, thank you Master!"

Chen Fei smiled and then began the first operation. He first powered the aircraft at the predetermined altitude and maintained the meter speed of 310~420 km/h horizontal flight.

Afterwards, he disconnected the telex control system electric gate and the angle of attack limiter electric gate, quickly pulled the rod to the end, and kept it up for a short time to lift the head to 110 degrees~120 degrees, and the angle of attack was 90 degrees~95 degrees.

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

When the nose starts to sink, the push rod reaches a neutral position and the engine is applied to the maximum state to form a yaw handling torque to prevent heading from deviating.

When the aircraft state is close to level, connect the freight-pass control system power gate and the angle-attack limiter power gate to adjust the aircraft state. The entire operation duration is about 5                                                                                                         

After the action is over, the meter speed is about 120~130 km    /h         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 the level flight.

Chen Fei's first operation was successful!

I'm fucking!

He Xiaoyao, who was sitting in the back cabin, was uneasy. He prepared more than a dozen plans to deal with the various situations that occurred in Chen Fei, but-

But nothing can be used!

The tower was silent, and all the staff on duty were stunned by the scene just now. They learned to maneuver the cobra for the first time, but they did not stall?

Chen Fei, Chen Fei, do you want to be so distorted!

Everyone was wailing in their hearts!
Chapter completed!