On the podium, Professor von Kármán, wearing a suit, became the focus of all the school professors and students in the auditorium. His manners were polite and elegant, his face was peaceful, and he exuded a unique temperament that blended German classics with top scholars.
As von Kármán briefly introduced himself, a wave of applause erupted in an instant, and everyone present paid tribute to this aerodynamics master who had come from afar, just like the scene when Rabindranath Tagore visited Tsinghua University.
"Thank you everyone."
Fon Karman stood in front of the microphone, staring at the teachers and students of Tsinghua University who applauded enthusiastically and burst out with unprecedented enthusiasm, and said slowly: "This is my second trip to China. It has been eight years since the last time I came to Tsinghua Campus. In these eight years,
, this country has experienced a lot of suffering, and I believe these sufferings have made everyone here understand the importance of aeronautical engineering."
The words spread throughout the auditorium and outside. Young students did not have a deep understanding of these words. Only Mei Yiqi and a group of Tsinghua professors understood the meaning of these words as if they were deeply hurt.
The skies belonging to China did not soar with fighter planes belonging to China. Japanese planes soared as if they were in no man's land, launching bombings on the Chinese soldiers on the frontline battlefield again and again. As a result, the war was defeated again and again.
The bomb coming from the top of the head is like the god of death, unable to dodge or fight back.
If the Japanese artillery can be resisted, then the fighter planes flying in the sky from the three-dimensional space are really unstoppable.
After September 18th, almost everyone understood the power of the Japanese aircraft. Countless troops became extremely afraid of the Japanese aircraft.
"The development level of aviation engineering determines the performance level of the aircraft, and the performance level of the aircraft will directly affect the combat effectiveness. A fighter aircraft with a maximum flying speed of 400 kilometers per hour can easily shoot down three aircraft with a speed of 250 kilometers per hour. This is the aircraft
The difference in performance levels.”
"Nowadays, the aviation industry is developing rapidly. The rapid development of aerodynamics and wind tunnels has allowed aircraft design concepts to move from the era of biplanes to the new era of all-metal monoplanes, achieving higher speed, higher maneuverability and combat effectiveness.
This is a good thing, but it is a disaster for the country China."
"As far as I know, the mainstream aircraft model equipped by the Chinese Air Force is the Hawker-3 biplane fighter. This biplane fighter, which had excellent performance in the early 1930s, has now fallen far behind the entire rapid development of aviation. Although Tsinghua University
Universities have long recognized the advantages of the monoplane concept, and Professors Zhuang Qianding, Hua Dunde, and Yin Wenyou have designed a new monoplane trainer aircraft, but this is far from enough."
"China needs an excellent fighter aircraft with an all-metal monowing layout, not a trainer aircraft."
"From an aerodynamic point of view, the aerodynamic layout of the biplane has unsolvable defects such as complex structure and high aerodynamic resistance. The flight speed limit is about 350 kilometers per hour. If better metal materials are used, it can reach about 370 kilometers.
The aerodynamic drag of the metal monowing aerodynamic layout, upper monoplane, middle monoplane, and lower monoplane, is significantly smaller than that of the double-wing layout, and the lift is higher. There is a serious generation difference between the two."
"Based on theoretical calculations alone, the combat effectiveness of an all-metal monoplane is equivalent to three biplanes with the best flight performance. If it enters actual combat and introduces the pilot's flying skills as a variable factor, the gap between the two aerodynamic layout aircraft will reach
5:1, or even 8:1, there is no exaggeration in this data. The Chinese Air Force is at an absolute disadvantage in front of the Japanese military aviation."
"I believe that all the gentlemen and ladies here have understood the difference between biplanes and monoplanes. Looking back, let's talk about how to develop aviation engineering."
"There are two core factors that determine the development of aviation engineering, theory and manufacturing. Here we will only talk about theory for the time being. Tsinghua University once shouted the slogan of aviation to save the country. So, what is the basis of aviation theory?"
"The answer is aerodynamics."
"Aerodynamics is a very comprehensive and important subject, developed on the basis of fluid mechanics, and is divided into theoretical research and experimental research."
"Theoretical research generally relies on the following principles: the law of conservation of mass in kinematics, Newton's second law in dynamics, the law of energy conservation in lift energy conversion and transfer, and the core equation is the Navier-Stokes equation of fluid mechanics.
and mathematical differential equations and calculus formulas.”
"The most important equipment for experimental research is the wind tunnel."
"In terms of theoretical research on aerodynamics, Tsinghua University is the earliest school to start, and the overall level is still not enough. However, it is worthy of recognition that in terms of experimental research, Tsinghua has independently designed and manufactured a 5-foot-diameter wind tunnel. Dr. Hua Dunde is the Tsinghua Air
Professor of Dynamics, is vigorously helping Tsinghua University build a new large-scale wind tunnel, which is the most advanced and largest wind tunnel in the Far East. By then, the large-scale wind tunnel will provide a solid hardware foundation for aerodynamic theoretical research and the development of new aircraft.
"
"The sky is extremely important. If a country wants to be strong, it cannot do without a strong air force. A strong air force cannot do without a fighter plane with excellent performance. A fighter plane with excellent performance cannot do without advanced aeronautical engineering. Aeronautical engineering
It is based on aerodynamics, and the development of aerodynamics cannot be separated from you."
"I am honored to stand here and say what I want to say. In my opinion, there are only two smartest races in the world, one is the Jews and the other is the Chinese."
"Gentlemen and ladies, believe in yourselves. You are no worse than anyone else. Please work hard for your motherland and develop fighter jets with outstanding performance to defend the sky of your motherland."
"China, which is suffering, needs your efforts."
"Thank you everyone."
In the auditorium, von Karmen, who gave a polite greeting after his speech, slowly walked off the podium.
The audience was silent. Thousands of teachers and students stared intently at this top scholar from a foreign country. The content of this speech deeply affected everyone present.
The importance of the sky!
The next moment, President Mei Yiqi and a group of professors sitting in the front row of the auditorium stood up. Seeing the appearance of the professors, the other students who were sitting upright stood up one after another, their bodies straight.
"Thank you for your teaching, Mr."
Voices containing the meaning of respect emerged from thousands of people, like streams, and finally converged into a uniform sound, sweeping through the auditorium like a torrent, echoing in all ears.
"Thank you, Professor Kamen..." Yu Hua was moved by von Kamen's kindness and support and whispered to himself.
After a speech, he rationally analyzed the gap between biplanes and all-metal monoplanes from an academic perspective, then transitioned to the importance of disciplines and the sky, and finally encouraged Tsinghua students to strive forward.
Von Kármán is one of the very few top scholars who has goodwill and good impressions of China.
This speech was like a shot in the arm, giving everyone present confidence.
As an industrial country, Japan's national power and military are too strong, far superior to China's by many times. Since September 18, China has lost the three northeastern provinces and the land north of Pingjin, and has been defeated again and again.
.
The Japanese used artillery, planes, and massacres to disintegrate the hope and confidence of countless people in China.
For Yu Hua, the all-out victory in the Anti-Japanese War was inevitable, but for the thousands of teachers and students in the auditorium and the tens of millions of Chinese outside Tsinghua University, they did not know whether they could win.
Under such circumstances, people who are not determined will become traitors and lackeys, working hard for the Japanese.
Because things like changing dynasties have happened too many times, many people don't understand why so many people become traitors. In fact, these traitors don't understand the meaning of anti-Japanese comrades to resist the Japanese.
The Japanese are so powerful that there is a high probability that they will change dynasties in the future just like the Qing Dynasty entered the customs. Resisting at the risk of death is far less effective than gaining support.
Looking back at history, one truth lies in the darkest place of every dynasty - the vast majority of people fear the consequences of rebellion, but no one can refuse the merit of support.
Because of this, for the traitors, they do not think of themselves as so-called traitors, but...
A hero who has the merit to support you!
The significance of von Kármán's speech is to make most people present feel warmth and hope. No matter what, they must work hard, burn themselves and give everything for the suffering China.
Surrounded by the thank-you ceremony given by all the teachers and students of the school, Professor von Kármán and the accompanying Colonel of the Army Aviation Administration and others left the auditorium to end this impromptu lecture of an academic nature.
…
"The importance of the sky..." In Pingzhai dormitory, Yu Hua was still immersed in Professor von Kármán's speech not long ago. He could not forget it for a long time, and his mood was agitated. He whispered softly, and the high-performance fighter jets in the prosperous China came to mind.
appearance.
There was only Yu Hua in the dormitory, holding a pencil in his right hand and a drawing on the table. He drew lines with the pen. Soon, the outline of a fighter jet appeared on the white drawing.
The teardrop-shaped glass cockpit, the iconic close-coupled canards, the large triangular aerodynamic layout, the horizontal vertical tail, the wing-body fusion design and the streamlined body, and the two triangular main wings are painted with the yellow Bayi logo on the surface. All these elements constitute a unique and prosperous world.
China’s main fighter jet—J-10C!
What is a hardcore military fan?
That is... he has experience in land and air services, is familiar with naval equipment, knows the development and functions of all military weapons, and can also tell the stories behind them.
On the white drawing, a third-generation semi-combatant aircraft that will be born seventy years later is vividly displayed, revealing the special style of a high-level killing weapon. Yu Hua relied on the image data in his mind to perfectly reproduce the aerodynamic layout of the J-10C.
But that's not all.
Yu Hua, in an excited mood and with a heroic spirit, took out a new drawing. The pencil touched the surface of the paper, leaving a faint friction sound and black marks. Soon after, a classic fighter plane with a central lifting body aerodynamic layout was born.
This is the famous Su-27 ‘Flanker’ that exudes elegance!
Looking at the Flanker on the drawing, Yu Hua couldn't help but imagine that if this fighter could be developed in the current era, the Su-27 Flanker equipped with troops and the performance of the third-generation aircraft would be able to face the Type 96 fighter, Type 97 fighter and Zero fighter of the Japs.
It can be said that a large number of propeller monoplanes such as fighter jets can be crushed easily.
It's a pity that the idea is beautiful but the reality is skinny.
Yu Hua was able to perfectly restore the aerodynamic layout of the central lifting body, but he did not understand the aerodynamic principles and foundations. Even if he followed the example, the world did not have the prerequisites to build the Su-27 'Flanker'.
Biplanes and all-metal monoplanes are a watershed. Propeller aircraft and jet aircraft are another watershed. Fighters using turbojet engines and fighter jets with turbofan engines are also a watershed. Each watershed requires a massive amount of forward power.
Technology is used as a support, involving materials, machinery, dynamics, aerodynamics, wind tunnels, computers and electronic equipment.
It embodies the most advanced and cutting-edge technologies of human civilization.
Yu Hua glanced at the elegant and noble Su-27 on the drawing, took a deep breath, took out a piece of paper again, and wrote with his right hand.
Five minutes later, on the third drawing, a cutting-edge fighter jet exuding the ultimate sci-fi atmosphere appeared. The canard wing + side wing + DSI air inlet + triangular main wing + full-motion tail constitute the world's unique lifting body side canard wing.
Aerodynamic layout, this is the fourth-generation fighter equipped by the Chinese Air Force in its heyday - the J-20 'Veylong'!
"So beautiful..."
Yu Hua stared at the J-20 Veyron on the paper that exuded a murderous aura. Various related videos he had seen in his previous life could not help but come to mind, and he sighed in admiration from the bottom of his heart.
At this moment, Yu Hua finally calmed down.
We are in the era of propeller aircraft, and in front of us is a fourth-generation fighter aircraft that embodies countless cutting-edge technologies in the future. The contrast between the two makes people feel inexplicably calm and confident.
For people in this era who are struggling to make ends meet, they may never dare to imagine how powerful China will be in the future.
"With me here, the future will definitely be better..." Looking at the J-20 fighter on the drawing, Yu Hua took a deep breath and whispered to himself.
After saying this, he took out a box of matches, rubbed it lightly, and red flames bloomed. Yu Hua lit three conceptual sketches of fighter aircraft that he had drawn. These conceptual sketches of fighter aircraft that are decades ahead of the current era and have the right direction must be physically destroyed to avoid
Risk of leakage.
After the three fighter plane concept drawings were burned, Yu Hua smashed the embers completely and destroyed them in the physical sense. With a calm and gentle attitude, he wrote an introduction to military and ground guidance.
After these days of busy work, the progress of the introduction to military and civilian guidance has reached the halfway point. According to the current efficiency, it can basically be completed within a week.
The sky was getting dark, and a wisp of red cloud appeared in the distance.
Tonight, for Yu Hua, there is still an extremely precious opportunity waiting for him.
…
No. 15, West Campus, Tsinghua University. This place was originally occupied by a professor of the Chinese Department. Later, the professor moved to the South Campus and the space became vacant. It was just a place for Professor von Kármán to stay.
"Professor Carmen, after the latest investigation, we found that the Chinese have possessed the most important standard concepts of the industrial system almost overnight, although it is not mature and comprehensive. This is very amazing. Originally, the Chinese were under the joint blockade of the West and the Japanese.
, there is no soil for the birth of standard ideas." Colonel George held a latest intelligence document in his hand, and his words were a little surprised and surprised.
standard.
This is the core of an industrial country. If a country wants to have the concept of standards, it must first become an industrial country, then continue to explore and summarize during the development process, and finally obtain this precious thing.
After hearing the words, Fon Karmen frowned slightly, but did not say anything. He was powerless to deal with such national-level matters: "What is the reason? Do you know?"
"The main reason is that this Chinese Mechanical Drawing contains the concept of systematic standards and emphasizes the importance of standards in industrial production." Colonel George responded: "Of course, although the Chinese industry has this concept of standards almost overnight,
However, limited by the level of technology and manufacturing equipment, the overall level of industrialization is still very backward, and we cannot get rid of the label of being an agricultural country."
China Mechanical Drawing...
Von Karman was curious.
"Dong dong!" Suddenly, there was a knock on the door.
Von Karmen heard the knock on the door and raised his hand to look at his watch. The time was exactly eight o'clock. The face of the young student in the afternoon came to mind. A smile appeared on his face. He didn't pay attention to Colonel George beside him and stood up to face the door.
Open the door.
In front of the door, stood Yu Hua wearing a Chinese tunic suit.
"Hello, Professor Carmen." Yu Hua greeted with a smile.