Zhu Jingyuan thought about all aspects of the situation in his heart and left his office.

After passing through the courtyard of the palace, I came to the warehouse where the two planes were stored.

"Type 5 combat aircraft", "Type 3 transport aircraft".

The Ministry of Industry used their official order of finalization to make a very simple and crude name.

It was not named after the 34th year of Taiping or the first year of Ankang, because now there may be several new types of aircraft a year.

If there is no special meaning, the character code will not be specifically awarded.

So it can only be named by number.

Zhu Jingyuan looked at the two planes in the warehouse and recalled the test machine that was originally made.

It feels like the difference between them may be even bigger than between cats and tigers.

From the structure of steel pipes, wires, wood, and canvas, it has become a pure metal structure of steel and aluminum.

Transport aircraft are still biplanes, and combat aircraft have become monoplanes.

The design of the second-generation Daniel Bernoulli, and the aircraft that he took to apply for a patent, are all the original painting style.

Their current transport planes can easily bully them.

If the other party's aircraft patent passes, if it is favored by the French military, it will definitely start to be rapidly iteratively upgraded.

The biggest factor hindering the development of their aircraft is the engine.

The biggest factor hindering the development of engine technology is the manufacturing process.

If the other party wants to achieve the same power engine as Daming, it will definitely be heavier or have a higher failure rate.

But in the absence of a choice, the other party will definitely continue to catch up, and will definitely continue to optimize and upgrade.

However, what if the other party has a choice?

What about Daming's initiative to export engines and aircraft to France?

With better planes and engines, the other party's engines and aviation industry will be squeezed directly to death from the embryonic stage?

Zhu Jingyuan came to the plane and patted the aluminum fuselage skin.

I feel that it is indeed possible to succeed, and the entire aviation industry in France has been completely flat since then, and has been using imported goods from the Ming Dynasty.

But there is also a certain possibility that France will learn from the design and craftsmanship of the Ming Dynasty and speed up the pace of catching up.

If it's the latter, you'll have to be very careful.

For example, if the other party successfully develops a technology, Daming will open up a technology.

Zhu Jingyuan was walking here and thinking about it again and again, when An Xiaona, who stayed at the door, suddenly ran in:

"Your Highness, Yun Niangniang is outside, and she is here to look for you."

Yun Niangniang is of course Liu Muyun, and she is the only "Niangniang" in this palace.

Zhu Jingyuan was stunned for a moment:

"How did this girl come from? Didn't you go back to your room and rest? Let her in. ”

An Xiaona went back, and Liu Muyun walked in quickly, although it can't be said that she has no image, but it can't be said to be stable at all.

It was the two little girls Ying'er and Ju'er, who followed behind with small steps, trying not to look hurried.

Zhu Jingyuan asked something other than that:

"Aren't you resting? Why did you come here by yourself? Is there anything urgent? ”

Liu Muyun made a blessing very quickly, and then said quite casually:

"I ...... The concubine found that she had nothing to rest, and the concubine had nothing to do, she just wanted to see His Highness. ”

It is also human nature for a newlywed girl to want to be with her husband.

Zhu Jingyuan smiled and shook his head, and then said jokingly:

"You're injured, and you've come all the way to the front yard......"

Liu Muyunqiao's face was slightly red, but her curiosity was even better:

"It's a small injury...... Your Highness, what are you up to? What kind of machine is this? ”

Zhu Jingyuan didn't ask anymore:

"This is a flying machine, a machine that can fly in the sky......"

Liu Muyun's eyes immediately widened:

"This is a flying machine!"

Although Zhu Jingyuan's goal is to promote the aircraft in an all-round way, it has not been fully disclosed to the public so far.

After all, it has only been more than a year since it was made, and many technologies are still being verified.

The production capacity of each plant is mainly supplied to the military, and it has not yet had time to be sold on a large scale in the civilian sector.

Zhu Jingyuan also hopes to hold back enough mature technology as much as possible, and then promote the long-term aircraft that can be used as much as possible.

Moreover, before the countries of Taixi have completely researched a working aircraft, it will still be as long as it can be maintained.

But now it's been kept secret, Bernoulli has made a plane, so there is no need to hide it anymore.

Liu Muyun had never seen an airplane before, but there were also relevant studies among the people, and he had heard about it when he was in school.

She has a lively personality, but she is completely defenseless to the possibility of flying like a bird.

So I paid special attention to it, and even thought about making it myself, but the conditions didn't allow it.

Now seeing the complete plane, which looks very mature, Liu Muyun's whole person is excited.

Circling around the combat plane, carefully touching its aluminum skin, he muttered with great surprise and surprise:

"When I thought about making an airplane myself, I just thought about using steel pipes and wood and canvas, and I had to use materials that were as light as possible.

"This thing is completely metal, even if it's aluminum, it has to weigh a ton or two so big, can this fly?"

Zhu Jingyuan nodded as a matter of course and said:

"Of course you can fly, I've done a lot of tests, and it only takes more than an hour to go from Beijing to your hometown of Jinan."

Liu Muyun was immediately stunned:

"Kyoshi! An hour! To my house! ”

Zhu Jingyuan looked at her reaction, and his heart was quite satisfied.

Then he watched Liu Muyun turn around and look at Zhu Jingyuan with a yearning on his face:

"Your Highness, can I fly the plane by myself!"

Zhu Jingyuan shook his head directly:

"No, you are not an ordinary student now, you must know that the son of a thousand golds can't sit down, and the son of a hundred gold doesn't ride a balance.

"But when the transport plane is more mature, you can travel by plane when necessary."

Liu Muyun's expression suddenly became very regretful.

However, she is not a character who is easy to be sad and sad, so she added the latter sentence quoted by Zhu Jingyuan:

"The Holy Lord is fortunate not to take advantage of the danger......"

Zhu Jingyuan nodded directly and said:

"You don't need to persuade me, although I am not the Holy Lord, I will not fly by myself, and even try not to fly as much as possible."

Liu Muyun stopped talking, and circled around the plane with a bitter face, and his attention had already shifted.

Full of curiosity and interest, he came back and asked Zhu Jingyuan:

"Your Highness, how did the flying machine fly? Why does it fly? ”

Zhu Jingyuan also looked at the plane and thought about how to explain it to her:

"You've probably played with kites, right? The heavier the kite, the harder it is to fly.

"But as long as you pull the kite fast enough, or the natural wind is strong enough, no matter how heavy the kite is, it can fly.

"The logic of the airplane is to change the engine and propeller from you, who are running with a kite in tow with a string.

"The engine doesn't want you to rest, it can drag the plane all the way with its head up.

"The plane is fast enough, or the wind is strong enough to fly.

"And then as long as the engine doesn't stop, like a person dragging a kite, the plane can continue to fly like a kite."

Liu Muyun suddenly realized, then glanced at the plane again, and asked another question with a leap of thought:

"If the wind is right, the kite can be dragged by the line and stabilized in the air, but can an airplane weighing several tons also do?"

Zhu Jingyuan thought for a moment, changed his thinking, and then nodded and said:

"If the wind speed is right, the flying plane can be as stationary in the air as the flying kite.

"The plane may even go backwards, and the engine is not a rope in your hand, but a kite string that is broken.

"When the plane is stationary relative to the ground, the flight speed is zero, and when it is backward relative to the ground, the speed is negative.

"But the speed of the airplane relative to the wind, the speed of the surrounding air, is not zero, nor can it be negative."

Liu Muyun suddenly realized again:

"In other words, no matter how heavy and big a kite is, it is also a kite, and then it is still the same sentence, as long as the speed is large enough, no matter how heavy and big the kite is, it can fly."

Then she immediately had a new question:

"Then why do kites and airplanes fly?"

Zhu Jingyuan looked at the girl with a puzzled look.

Although she is theoretically four years older than herself, she has been much older than her in her two lifetimes combined.

And the complexity of the mind of a girl who grew up in this conservative environment is much simpler than that of a girl in later generations.

She is twenty years old, and her personality is still like that of a child, but her knowledge is not low.

"You haven't studied fluid mechanics, have you? Then do a force analysis according to the fundamental theorems of mechanics.

"The wind blows the upward-sloping kite and the wing, and the force received by the wing can be broken down into a backward force, an upward force.

"The propeller drags the plane, or the person drags the kite forward, and the forward force is formed that cancels out the backward force.

"The only force on the kite and the airplane itself is the upward lift and the downward gravity.

"The faster the kite and the wings are upwind, the greater the upward force.

"When the upward force exceeds the gravity of a kite or an airplane, it can fly.

"Correspondingly, a higher windward speed means that the person towing the kite can run faster or the engine will have more power."

Liu Muyun immediately understood this logic, nodded as a matter of course, and then continued to ask curiously:

"What if you studied fluid dynamics?"

Zhu Jingyuan said expressionlessly:

"If you did, you wouldn't have to ask me."

Liu Muyun immediately said:

"But people haven't studied it, so I asked Your Highness, how should I understand it if I have learned it?"

Zhu Jingyuan hesitated for a few seconds, looked at the curious eyes of the girl in front of him, and decided to explain a little:

"A bowl filled with thick soup accidentally spilled a little.

"This drop of soup will not fall directly, but will flow inward along the wall of the bowl.

"Eventually it flows to the bottom of the bowl, and the hand that makes the bowl stick to the lake......

Liu Muyun immediately nodded and said:

"Yes, that's true, because the soup is sticky, what does it have to do with airplanes?"

Zhu Jingyuan did not answer directly, but continued to ask in a guided manner:

"If the side walls of the bowl become so light and soft that the slightest force can deform it, will the soup still flow inward along the walls of the bowl?"

Liu Muyun was stunned for a moment, and her flexible brain immediately reacted:

"If it's ideal, the walls of the bowl are extremely soft and deformable, and the soup will drip normally.

"The extremely soft walls of the bowl will deform with the dripping soup and deform into the normal dripping trajectory of the soup.

"The walls of the bowl are stuck to the dripping soup, so the planes and kites are actually stuck to the air flowing above?"

"It's going to draw inferences......"

Zhu Jingyuan sighed with a smile, and took out a piece of paper at the warehouse registration desk.

Pinch one end of the paper with your hand and let the other end hang down naturally.

Blow from the direction of the hand towards the drooping end, and the drooping end floats up on its own:

"You see, the fast-moving air glues the drooping paper......"

Liu Muyun blinked his eyes and said with an incredulous face:

"No, Your Highness, our middle school teacher did this experiment.

But he said that it was because the air was moving fast, so the pressure was low, and the air below was slow, so the pressure was high, so the paper was lifted.

"It's not glued...... Well, I can't say it's not ......."

Liu Muyun himself said in the end, and he had already reacted:

"This ...... The air flows fast, so the pressure is small, and the air can stick to the paper, which is actually the same thing? ”

Zhu Jingyuan felt that this kid was really smart, and he also nodded with a smile and said:

"Yes, it is the same thing, two different ways of expression, the essence of which is the conservation of energy.

"Water is sticky, and when it flows over a bent surface, it deflects along the bend and speeds up.

"The air is also viscous, and as it flows over the curved surface, it also deflects in the direction of the bend and increases its speed.

"But mechanical energy is conserved, the forward flow is faster, and the direction is deflected, which requires energy.

So the fluid shrinks, it shrinks inward, and the pressure on the arc through which it flows decreases.

"It's like when you stretch the dough, the middle of the dough becomes thinner, and the pressure on the table is reduced when the thinner part is reduced."

Liu Muyun listened to these explanations, his eyes were completely lit up, and his whole spirit was extremely inspired.

It seems that something terrible has been discovered, and I repeat it over and over again:

"That's it, that's it......"

Zhu Jingyuan watched from the side, but immediately reminded seriously:

"You just know what's going on, you don't have to think too deeply, unless you want to teach yourself fluid dynamics."

Liu Muyun was stunned:

"Why can't you think deeply if you don't study fluid dynamics?"

Zhu Jingyuan directly gave a sentence:

"If you think but don't learn, you will die, and if you only dream and don't learn, you will be full of doubts in your heart, and there will even be countermeasures."

Why can modern fighter jets still fly even after they turn over?

Why does the bulge on the upper surface of the wing allow the air to flow faster on the upper surface?

Why can even a flat plate, or a wing with symmetrical convex tops and bottoms, fly?

If you don't study theories, don't do serious research and calculations, and just make up these questions with simple fantasies, you may fall into sophistry, self-doubt, and even start to believe in agnosticism.

It is asserted that humans still don't know how airplanes fly, that humans don't know why bicycles don't fall, and so on.

Even the formation of human beings only summarizes the laws, and human beings do not know the reasons for the formation of laws.

In fact, this is not "unknowable laws" at all, but "I don't know".

Further, without relying on learning, we have discovered new "laws" that "solve doubts" by relying on brain supplements, and then rejected the verified actual laws that already exist, and evolved into the so-called "civil science".

Physics is a discipline that describes objective laws, and science is a way of thinking that explores and discovers laws.

Why a law is a law is a philosophical question, not a physical one.