Due to its stability, the passenger plane itself is actually relatively difficult to enter the spiral state. Therefore, Xu Qing brought the plane into a deep stall and then put the rudder full on, so that the plane could enter the spiral state. Under normal circumstances, the passenger plane would not be able to enter the spiral state even if it was tossed around.

Unable to enter the spiral.

This situation of inconsistent stalling degrees on both sides of the wings is not only dangerous for large passenger aircraft, but also for small aircraft with strong maneuverability. Once the aircraft enters a deep spiral state, it is likely that it will not be able to recover.

For large passenger aircraft, even stalling is prohibited, not to mention a spiral with a higher risk factor. This situation where one wing stalls before the other causes the aircraft to deflect towards the side that stalled first.

, training is only allowed on certain highly maneuverable aircraft. For passenger aircraft with poor maneuverability, this is basically catastrophic.

During the spin of the passenger plane, it will have a huge impact on the aircraft structure. With each revolution, the speed will increase, and the pressure will increase. Eventually, the aircraft structure will be unable to withstand it, causing the aircraft to disintegrate.

At that time, Han Qi was most famous for his aircraft accidentally entering a spiral state, and even it was eventually corrected. However, the horizontal stabilizer, vertical tail, and wing tips all had structural fractures at that time, and a large amount of hydraulic oil flowed out from the fractures, and the aircraft

The control system was almost paralyzed. Relying on the almost uncontrollable aircraft, Han Qi forced the aircraft to land safely.

Of course Xu Qing knew about Han Qi's famous passenger plane spin incident. Han Qi should be the one with the most say on the structural damage that the passenger plane spin could cause to the aircraft.

When Xu Qing continued to use the stick and caused the plane to stall, Han Qi roughly knew what Xu Qing wanted to do, but he couldn't believe that Xu Qing was so bold.

But, who is Han Qi? If Xu Qing dares to do it, I will definitely dare to continue. If Xu Qing is stopped midway, wouldn’t it weaken his momentum?

Han Qi never showed any competitive spirit towards others, but Xu Qing was different.

Since he became famous, he has been compared with Xu Qing all the time, always being a little lower. Many people feel that if Xu Qing had not retired, he would not be the number one person in civil aviation now.

Therefore, Han Qi's inability to be competitive with others is based on the fact that these people are not as good as me anyway. But in front of Xu Qing, he does not have this arrogance.

However, even if he was mentally prepared, Han Qi couldn't help but twitch his eyelids the moment Xu Qing stepped on the rudder.

In terms of courage alone, Han Qi felt that he was really inferior compared to Xu Qing. Things like spiraling the passenger plane were done as he was told.

From the bottom of his heart, Han Qi said with a cold face: "I really belong to you!"

The corner of Xu Qing's mouth raised: "I'll just take it as a compliment from you!"

Just when the two of them finished speaking, the plane had a huge elevation angle and then fell upside down to the right. The plane seemed to have entered a deep sea vortex, rotating and diving downwards.

Wang Tianliang, who was sitting in the back, was feeling cold from the soles of his feet to the Tianling Cap. It seemed that the blood in his whole body had stopped flowing. Even Han Qi was also holding the plate in his hands and putting his feet on the rudder at this moment. What mattered to his family and life? Han Qi said more

Are you willing to believe in yourself? No matter who is sitting next to you!

When the aircraft enters the initial stage of the spiral, the speed of the aircraft is not too fast? At this time, the aircraft is only in the initial stage. Strictly speaking, the aircraft has not started to enter the spiral state.

Generally speaking, the aircraft will not actually enter the spiral transition stage until it has made two turns. After this, it is the most dangerous vertical spiral stage.

At this stage, the aerodynamic force and inertial force of the aircraft have not yet reached balance, and the aircraft still has a tendency to automatically escape from the spiral. For aircraft with poor maneuverability, this means that the stability is stronger, as long as the aerodynamic force

If the learned force and the inertial force have not reached balance, the aircraft will have a tendency to spontaneously return to stability.

However, Xu Qing never released the right full rudder from beginning to end, which prevented the aircraft from self-repairing the deflection? The aircraft continued to suffer from large sideslip.

At this time, the speed of the aircraft always remained slightly lower than the stall speed, and at the same time, the aircraft's sideslip indicator began to show that it was slipping to the right. The sideslip condition displayed on the sideslip indicator indicated the spiral direction of the aircraft.

The eyes of the three people in the cockpit first looked upward toward the sky, then continued to turn right and downward, and finally began to gradually go straight downward.

After the plane turned 360 degrees for the first time, Wang Tianliang couldn't help it anymore: "It's almost done, let's change it!"

During normal training for spin recovery, that is, after one or two turns, the recovery action begins. Because after one to two turns, the aircraft has not completely entered the spin, so the possibility of recovery is relatively low.

Big ones. When you turn further down, when the spiral transitions, or even a vertical spiral, it will be quite difficult to recover. Even for some types of aircraft, as long as they enter this stage, they will lose the opportunity to recover, and the result will be

The machine crashed and people died.

"It's too early!" Xu Qing immediately rejected it. Just kidding, if you correct it after a spin, what's the difference between it and no spiral? It ends just after it starts, isn't that a joke?

Wang Tianliang immediately turned pale, why did he get on this pirate ship?

"How many times did you turn that time?" Xu Qing asked Han Qi.

Unlike Wang Tianliang, who was about to show his three souls and seven souls, Han Qi just twitched his face and said in a cold voice: "Four and a half circles!"

Han Qi knew how courageous Xu Qing was. He wanted to replicate what he had done before. However, whether he could change it after four and a half spirals, it really depends on God's will.

Some things can be done once, but even the same person won't be sure about it the second time.

If Han Qi was forced to go through another four-and-a-half-turn spiral, he would only be able to survive in a matter of five to five. For a moment, he even hesitated whether to stop Xu Qing.

However, Han Qi finally endured it.

Second lap!

At this time, the plane's falling speed had increased significantly, reaching a full four thousand feet per minute. This was only the second lap. At this moment, Han Qi slightly moved his sitting posture and adjusted himself to a relatively faster position.

It was a comfortable position. In fact, this was not because Han Qi was uncomfortable sitting up, but because he was upset and wanted to relieve his anxiety. To be honest, as the plane continued to rotate like this, he would become more and more confident about the recovery.

Low.

At this time, Xu Qing's face gradually became serious. He was still under pressure from the spiral state. He was not a god, so how could he not react at all.

The third round!

At this time, the aircraft's falling state has changed to an almost vertical dive. The aerodynamic force on the aircraft has now balanced with the inertial force. The aircraft will perform a spiral dive motion around the plumb direction with a relatively stable radius.

.At this time, the aircraft was approaching the stage of vertical spiral.

Once the aircraft enters this vertical dive state, its descent rate directly soars to 10,000 feet per minute.

What is the concept of a descent rate of 10,000 feet per minute? It is equivalent to the plane rushing downward at a speed of more than fifty meters per second. In other words, in the blink of an eye twice at normal speed, the plane will drop more than fifty meters.

On the central radar screen of the Jiangning area control room, Qingyuan's aircraft with aircraft number 1533 and transponder 4231 stood out from the rest of the radar screen.

You can see the flight data of the surveillance aircraft on the radar screen. Naturally, you can also see the altitude and descent rate of Xu Qing's plane.

When the controller in charge of monitoring saw Xu Qing's plane dive down at a full 10,000 feet per minute, and the altitude value dropped crazily as if the brakes were on, he felt a little uneasy in his heart, and turned to look at the same person beside him.

The director of the radar screen said, "What are they doing? This rate of decline is too exaggerated."

The director's eyelids were twitching wildly. On the radar screen, he could see not only the height change parameters, but also the flight path parameters. He could find that Xu Qing's plane almost stayed still, which looked extremely strange.

Even if the plane dives downward, it must be rushing down at a certain angle. How can it fall straight down like this? And the rate of descent is too exaggerated!

"Are they training tail spins?" the director guessed. Apart from tail spins, he really couldn't think of any other situation that matched what he saw.

Tail spin is another way of saying spiral. The meaning of both is the same. Since the radius of the spiral is very small, it is basically impossible to reflect on the radar screen, making it look like the aircraft is standing still from the radar screen.

.

"Can a passenger plane still fly in a tail spin? Isn't it forbidden for passenger planes to enter a tail spin?" The controller asked strangely: "It is not a highly maneuverable aircraft such as a fighter jet. After entering a tail spin, the passenger plane can still recover?"

"How do I know? However, there is something wrong with your words! Isn't there a person on the plane who became famous after correcting the tail spin of a passenger plane?" The director smiled bitterly: "You really have your Xu Qing! You are so courageous!

"

"Han Qi?" The controller smiled and said, "Director, could they have entered a spin by mistake? Is it dangerous?"

The director sneered: "It is naturally difficult for passenger aircraft to enter a spin state due to their design. They have self-recovery characteristics. Except for some very rare circumstances, passenger aircraft will basically not enter a spin state. Besides, if it is really caused by misoperation or airflow,

It has caused a spin. Do you think the two people above will not recover from the initial stage of the spin? Or will the aircraft reach a deep spin? This is a descent rate of 10,000 feet per minute. Don't worry! It must be them.

It’s tossing!”

When the two of them were discussing Xu Qing and the others in the control room, Xu Qing also realized that it was almost time to make a correction.

Three laps! Three laps is the range that Xu Qing thinks he can control. Beyond three laps, he is not absolutely sure whether he can recover.

From the beginning, Xu Qing kept the throttle at idle thrust. After the aircraft completely entered the spiral state, the steering wheel immediately stabilized and the rudder simultaneously retracted the input and returned it to the neutral position.

Then, Xu Qing stepped down with left rudder and entered the anti-rudder amount to stop the aircraft from rotating.

The input of anti-rudder amount must first determine the direction of the spiral. The so-called anti-rudder is to step on the rudder in the opposite direction to the spiral. This can stop the rotation of the aircraft.

However, sometimes the unit is rotated wildly, so how can we judge the direction of the spiral just from the senses? Then we can judge it from the sideslip meter.

The sideslip direction displayed on the sideslip meter is the spiral direction. This is a hard indicator for judging the spiral direction and is very intuitive.

Xu Qing's anti-rudder input was very accurate, never being too large or too small, and instantly stopped the aircraft's rotation without any bias.

After the aircraft stops spinning, the aircraft is in a normal stall state, and it is much easier to recover from it.

Xu Qing began to hold up the steering wheel and reduce the angle of attack to less than the critical angle of attack. On the PFD, Xu Qing always kept the aircraft's attitude slightly smaller than the pitch limit indicator. After maintaining this for a few seconds, the aircraft came out of the stall state.

After the plane's speed had steadily increased enough, Xu Qing slowly returned to the throttle, and at the same time, he began to gradually lift the plane to stop the plane's downward trend.

Finally, Xu Qing stabilized the plane in level flight.

Within three laps, Xu Qing's recovery movements still seemed to be very easy.

Seeing the plane come out of the spin, Han Qi breathed a sigh of relief, put down his left hand, and moved his feet away from the rudder surface.

As long as Xu Qing dared to let the plane make another turn, Han Qi would definitely intervene in the control. It didn't matter even if Xu Qing disagreed.

"Don't panic, don't panic, I'm measured!" Xu Qing couldn't help but chuckled when he saw Han Qi's relieved look.

Han Qi rolled his eyes: "I don't believe you dare to change it after four rounds! So don't just use your words."

Regarding Xu Qing, Han Qi always maintained a strong desire to win and did not want to lose anything even in verbal confrontations.

"Let's get down to business! Let's get down to business!" Xu Qing knew that he was wrong and did not continue the topic. Instead, he promoted again: "The aerodynamic configuration of our aircraft has been modified, and the aerodynamic performance is better. For example, our approach

Less speed!”

A small approach speed intuitively shows that the aerodynamic performance is better. Because the aircraft does not need extra speed to compensate for the extra lift. A smaller approach speed will naturally increase safety and control difficulty. This is the most direct result.

Advantage.

"Also...for example, when both engines stall, the normal glide ratio of the 737NG is 11 to 1, but our glide ratio can reach 15 to 1. This is very convincing!" Xu Qing was excited!

road.

Glide ratio refers to the ratio between the forward distance and the altitude loss of an aircraft such as a glider or airplane during unpowered flight.

When both engines of a passenger aircraft stall, it is equivalent to a glider in a sense. At this time, the glide ratio of the aircraft is directly related to whether the aircraft can glide to a nearby airport.

"Just talking about it is not convincing, let's do it in practice!" Xu Qing said with a smile.

The corner of Wang Tianliang's mouth twitched, and then Xu Qing closed the throttle and cut off the two starter handles at the same time!
Chapter completed!