"Due to aerodynamic reasons, the exhaust gases create a flow choke effect at the nozzle. The speed of sound increases with the square root of temperature, so the use of high-temperature exhaust gases improves engine performance. At room temperature, the speed of sound in the air is 340 m/s, while in the hot gases of the rocket it can reach more than 1700 m/s....."

（Zzzzzzz… ）

"For optimal performance, the pressure of the exhaust gas at the end of the nozzle needs to be equal to the confining pressure. If the exhaust pressure is less than the confining pressure, the carrier will slow down due to the air pressure difference between the front and end of the engine. And if the exhaust pressure is greater than the confining pressure, the exhaust pressure that should be converted into thrust is not converted, and the energy is wasted. In order to maintain the balance between exhaust pressure and confining pressure......"

（Zzzzzzz… ）

"The loss of pump gas is negligible compared to the heat loss at the nozzle. Engines used in the atmosphere use high-pressure power cycles to improve nozzle efficiency, while vacuum engines do not require this. For liquid engines, there are four basic forms of power cycle in which propellant is injected into the combustion chamber......"

（Zzzzzzz… ）

"Song Wenbin!!"

The elderly professor on the podium couldn't stand it, and a chalk head was thrown at the head of the young man who was snoring in the classroom.

Song Wenbin, who was in a fugue and was too empty, suddenly raised his head from the table and looked around.

In the classroom, Huo Yu, who was sitting next to him, was pursing his lips and smiling, Sutina next to Huo Yu was looking at him worriedly, and some other pilot students were snickering, and some were struggling.

"Don't you sleep every night!?"

The old professor glared at Song Wenbin very dissatisfied, and said sternly: "I want to go to sleep and go back to the dormitory!" ”

This is Song Wenbin's first week in the training base, the daily life of the training base is very hard, every day Song Wenbin has to learn to survive in the state of disappearance, sit in the gyroscope and spin around until he vomits, or jump around dozens of kilograms of clothes, or simply run around the playground crazy circles to train endurance, these things he had been trained by Huo Yu before going to Indonesia, and it is not too difficult to pick it up again at this time.

However, the only thing that made him feel unbearable and even extremely painful was undoubtedly the basic theories that astronauts had to learn, including but not limited to astronomy, geophysics, space dynamics, rocket dynamics, communications, computers, etc......

God is pitiful, Song Wenbin has never touched a piece of paper since he graduated from high school, and now he suddenly puts a book higher than others in front of him for him to learn, and he almost didn't kill him.

But in order to complete the mission and complete the filming task of this episode, he had to force himself to study and force himself to come to class. But the result is not beyond his control, no matter which professor comes to class, Song Wenbin will fall into a coma after ten minutes of class, those dense formulas, those complex theorems and mathematical calculations are like the best sweat medicine, and he will faint when he touches it.

"I don't sleep, I don't sleep."

Song Wenbin apologized to the old professor of rocket dynamics, who is highly respected in the world.

The old professor glared at him helplessly and began to write formulas on the blackboard.

Fn=mVe=mVe-act+Ae（Pe—Pamb）

"Since a rocket engine does not have an air intake for a jet engine, there is no need to deduct ramjet drag from the total thrust, since the net thrust is equal to the total thrust (excluding static counterpressure).......

（Zzzzzzzz…… ）

"Song Wenbin!!"

Song Wenbin woke up again.

The old professor looked at Song Wenbin and said with hatred: "You, you, how can you go to space like this." ”

"Teacher..."Song Wenbin said bitterly: "I'm a commercial flyer... Out of the money... You know that commercial flying is to let the richest fools fly in the sky, and you have to learn everything, how to do business. ”

"You think you went to space on a civilian plane?"

The old professor said angrily: "There are several commercial flights in the world, these things you just go to take Musk's Dragon spacecraft, you have to learn, we are at this level in this era, you can't pass the test, who dares to let you go up, who is responsible for accidents!" ”

Song Wenbin: ......

"I learned... I learned... Well, can you start teaching me physics in junior high school, and all my junior high school knowledge has been returned to the teacher. Song Wenbin said desperately and sincerely.

Old Professor: ......

After class, after spending forty minutes to finally explain Newton's second law to Song Wenbin, the world's top professor left the classroom mentally tortured, and vowed never to leave Song Wenbin in class and sleep again.

But Song Wenbin was very painful, he looked at Huo Yu and Su Tina helplessly, and asked, "Can you understand?" ”

"It's okay, in fact, the professor is already teaching you very much in order to take care of your level, these are some of the most basic knowledge of rocket dynamics, but the level of ordinary college students, some science students who graduated from high school with good grades can understand it......," Sutina said worriedly.

"Shut up." Song Wenbin stopped Sutina's Versailles behavior, and looked at Huo Yu expectantly, "Can you understand?" ”

"I can't." Huo Yu immediately denied it. Of course she didn't understand, she wasn't interested in these things at all, and she was playing on her phone the whole class.

Song Wenbin showed a look of relief, after all, he was not alone.

"But Brother Song, Huo Yu passed all the physical fitness tests with full scores......" Su Tina reminded him in a low voice on the side.

Song Wenbin's head began to sweat.

Indeed, the same as before going to Indonesia. Huo Yu showed complete elegance in these tests, she could climb the mountain with twenty kilograms on her back expressionlessly, and she could also not change her face when Song Wenbin and Su Tina fell out of the rotating seat and vomited, almost all the reserve astronauts were amazed at Huo Yu's physique, and the team leader who trained them Han even thought that she was a natural astronaut, and wanted to take her to visit the spacecraft in advance, she sat here to study, completely out of friendship to accompany the other two colleagues.

"Damn, I also want to learn practical skills."

Song Wenbin said to Huo Yu: "I also want to become as strong as you, you train me." ”

Huo Yu glanced at Song Wenbin, but he seemed a little lacking in interest.

After being a colleague for so long, Song Wenbin could see at a glance that Huo Yu had something on his mind, if it was a normal state, Huo Yu would be very happy to hear this kind of words, and maybe he would pull him to the training ground on the spot to practice, but what was going on with this sick look.

"What's the matter, frosted eggplant?" Song Wenbin asked.

Huo Yu looked at him with an expressionless face.

Su tina snickered on the side: "Three days in Hedong and three days in Hexi, she is also on the hot search." ”

Song Wenbin was taken aback, Huo Yu was also on the hot search?

So he took out his mobile phone and wanted to take a look, but Huo Yu pressed it down, she frowned, and said quite unhappily: "There's nothing to see, don't look at it." ”

The more she said this, the more curious Song Wenbin became, avoiding Huo Yu and quickly opening Weibo, and sure enough, there was a ——— Huo Yu beating people on the hot search list of Weibo.

Song Wenbin was stunned when he saw this hot search, Huo Yu beat people? Huo Yu did beat people, not only did he beat many outlaws he saw during the trip, but even Wei Ning was beaten by Huo Yu, but ...... Haven't these things been going on for a few days, recently, Huo Yu has been busy with the company's affairs, busy with special training at the training base, and she hasn't beaten people at all, why is she beating people on the hot search at this time?

With confusion, he clicked on the hot search.

It turned out that it was the well-known D station blogger King Tom Sr. who posted a video. What is it like to be the ultimate women's boxer? 】

One look at the playback, the good guys are more than 20 million.

Open the video again and take a look, accompanied by some familiar and a little humorous music, a man's slightly ridiculous voice sounded.

"In June 2013, as the whistle blew, a 20-year-old woman fell heavily in the ring, bleeding from her mouth and nose, and fell unconscious. The comatose woman's name was Wallenda. Shevchenko, the famous three-time champion of women's bantamweight and known as the Siberian Tiger, has dominated the European bantamweight arena for five years, but at this moment, Wallenda, who is at the peak of her life, has met her first real opponent and the last opponent in her life.

Because after this fight, Wallenda said goodbye to the ring due to a moderate concussion and retired permanently.

And the initiator of all this, the fifteen-year-old genius girl standing in front of her, was known as ryoko rain at the time. Now, of course, she has a more familiar name.

She is the true practitioner of the way of ——— women's boxing, Kagura Chizuru who lives in the real world, the benchmark of appearance in the field of sanda, and the three-dimensional incarnation of the choice of the god of abuse, hello everyone, I am the rookie up master Old Tom King.

In 1999, Huo. Sanlida I. Yu was born in a family in Kowloon, HK......"

Song Wenbin only watched the beginning of the video and withdrew.

Take another look at the comments, like first.

Old King Tom: "More than 500,000 likes. ”

Song Wenbin turned off the video with a headache and looked at Huo Yu.

“ryoko？”

"Hmm." Huo Yu tilted his head.

"I didn't know you had an English name."

"You didn't ask, and it's Japanese." Huo Yu said lightly.

"It's romanized." Sutina whispered excitedly.

"Good fellow...... No wonder you drive GTR. Song Wenbin pouted, "Your composition is really complicated." ”

This joking remark made Huo Yu's face even more cold, she looked at Song Wenbin expressionlessly, and said, "Aren't you going to train, let's go." ”

Song Wenbin looked at Huo Yu and stopped talking.

Sutina on the side squirmed, and the monkey said beside Huo Yu: "Laugh at me, you laugh at me... Hee-hee, what's the matter, now you're also on the hot search, giggles, it's really unexpected, you're so fierce at the age of fifteen, now it's okay, everyone else knows, you have to be hacked into a sieve. ”

"My heart isn't that fragile."

Huo Yu raised his head and looked at the Sutina and said, "Just fight, just say it, so what?" ”

Song Wenbin was also helpless, and said: "I said you... You really can't beat people indiscriminately in the future, and if you continue like this... Sooner or later, something is going to go wrong with this show. ”

"You don't need to remind me." Huo Yu said expressionlessly.

Seeing Huo Yu like this, Song Wenbin had nothing to say. I had to follow her to train.

A few hours later, when he returned to the dormitory after training, Song Wenbin couldn't wait to take out his mobile phone again, flipped out the video of King Tom Sr., and watched it from beginning to end.

The video is 30 minutes long and belongs to the hardcore ruthless series, which details the life experience of the hardcore ruthless Huo Yu, from his father's imprisonment to his mother's remarriage, from living in Japan to becoming the youngest European Championship champion, from returning to China to join the national team to having conflicts with teammates, to retiring like a meteor, and finally participating in an extraordinary journey. The history of more than ten years of this is described in detail.

Song Wenbin watched everyone numb all the way, especially when he saw Huo Yu having conflicts with male players in the national team, beating him to a second-degree disability and finally being ordered to retire, his scalp was numb.

He wasn't shocked by the things Huo Yu had done, he just felt that there were really no secrets on the land of China. As long as you become famous, no matter what dirty things you have done before, you can turn them all over for you, and even the three generations of your ancestors can be brushed over.

There is no doubt that Huo Yu's experience, as a well-known person, cannot stand up to scrutiny.

Although the video style of King Tom is very funny, there are many elements of touting and hunting. Everyone is happy to see it, but people with hearts don't think so, plus the extraordinary journey is now on the cusp, and the topic is very high. This video is like a knife that completely tears apart Huo Yu's past, nakedly exposed to the sun. And Huo Yu himself doesn't seem to like the feeling of being watched by the public.

Song Wenbin felt this, but he couldn't help it.

If you want to say that the previous video of Black Sutina was purely fake, he could still find some connections and give that thing away. But this video is different, it's all real. And King Tom is not a lonely and unknown little UP, he is the top of Station D, it is impossible for him to let the seals give this kind of entertainment video, after all, they are entertainment stars, and they are not really big shots, Huo Yu's past can't stand scrutiny, it's her own business, who let her start lightly or seriously.

Besides, even if King Tom took the initiative to give the video out of his gracies, what use would it be, the video was just an introduction.

Thinking so in his heart, Song Wenbin clicked on Weibo again to look at the comments under the hot search.

Good guys, the comment section is even more real.

Even the year her father was in prison, the crimes he had committed, and the photos of the male national team player who had been injured by Huo Yu, the photos of his injuries when he was beaten, and the injury certificates issued by the hospital all came out, none of them could be avoided, and they were all treated as dry goods and received full praise.

Before becoming famous, no one may care about these things, but after becoming famous, any of their actions will be carefully observed under a magnifying glass.

Looking at these comments, Song Wenbin had a headache, if they were just entertainment stars, if they were just simple outdoor hosts, this kind of thing would be exposed, after all, it was a thing of the past, as long as they could entertain the public in the future and shoot a good show, it would be okay if they were scolded and hacked.

But now their position in this show is very sensitive. is related to the image of the country, and he is very worried that this matter will affect his impression of Huo Yu, which will lead to the failure of the show.

The words have been released, the flag has been set, the company has also spread the word, and maybe even the investors have paid.

If the mission can't be carried out because of Huo Yu's past, then a few of them will really become clowns, pure clowns.

(End of chapter)