Into Unscientific

Chapter 172

Chapter 172 "About the things I did when I rubbed the plane with my hands after the coup in the Song Dynasty" (6.8K)

Throughout the long history of human civilization, the ancestors have almost never stopped looking up at the sky.

Why do human beings yearn for the sky?

Before Xu Yun traveled to the Song Dynasty, he heard an explanation starting from the particles of matter:

well known.

All the elements in the universe come from supernova explosions.

It produces everything in the physical world that you can see, including yourself.

The atoms that make up your left hand may come from different stars than the atoms that make up your right hand.

When you look up at the stars.

Your eyes may be looking at the very same galactic matter that your eyes are made of.

Your thoughts are racing and your brain cells are sending nerve impulses.

Every nerve transmission may be the first handshake between matter across galaxies.

You look up at the sky.

Because you are originally from the sky.

Xu Yun didn't know whether this kind of statement that was tenable in science could be applied to the field of idealism, but he was very clear about one thing:

In the long history of civilization in China.

Indeed, countless ancestors have expressed their yearning for the sky either through words or through practice.

For example, Jin Wang Xizhi wrote in "Lanting Collection Preface":

"Looking up at the vastness of the universe and looking down at the abundance of categories, so you can enjoy the entertainment with your eyes and eyes, and believe in Coke."

And Li Bai's "Yuan Danqiu Song":

"Long circle, follow the star rainbow, ride a flying dragon and hear the wind, cross the river, cross the sea and connect with the sky, I know that your mind is endless."

in these poems.

The author directly or indirectly expresses his desire to fly to the sky, and expresses his attitude towards life.

Overlook the world from a high height and enjoy life happily.

And some people are different from Li Bai and Wang Xizhi. They may not have literary talent, but they have a heart to explore.

For example, Xu Yun is currently in the year 1100 AD, the first year of a new century.

Follow the historical trajectory.

27 years later, the Jin people destroyed the Northern Song Dynasty, and the two emperors were taken away.

One hundred and thirty years later, the Yuan Dynasty destroyed the Southern Song Dynasty, and the mountains and rivers fell to foreigners.

But the Yuan Dynasty only lasted less than a hundred years, and the sun and the moon will reopen the Great Song Dynasty.

At that time, there will be another Wanhu named Tao Chengdao.

Tao Chengdao is proficient in gunpowder and made great contributions in the process of Zhu Yuanzhang's conquering the world, but he himself has always been full of curiosity about the sky.

Finally in 1390 AD, Tao Chengdao made a decision:

He wants to fly!

According to Tao Chengdao's plan.

He will tie 47 rockets to the back of the snake-shaped seat, and use the gas produced by the burning of solid explosives in the rockets to erupt outwards.

The rocket will fly forward due to the reaction force of these gases, and several rockets are tied to the seat, which will drive the seat and the rocket to walk together.

In this way, while sitting on the seat, he will be propelled into the sky by the thrust of the rocket.

Other than that.

He also arranged two huge kites on the seats.

This not only allows him to continue flying, but also allows him to land smoothly.

Qian Lao, who is famous in later generations, once described the scene of Tao Chengdao flying into the sky like this:

"At that time, his servants were terrified, but when faced with the worries of the people around him, Tao Chengdao looked up to the sky and laughed and said, Flying to the sky is my long-cherished wish for thousands of years in China. Later generations have broken out a road to explore the sky. You don't have to be afraid, come and light the fire quickly!"

Seeing this, the servants had no choice but to light the fire according to Tao Chengdao's request.

After a while.

With a bang.

Tao Chengdao was lifted into the sky by the thrust of the rocket.

Then Tao Chengdao designed the second phase of the plan, the gunpowder was ignited, so as to continue to increase the height of the installation.

However, just as the disciples and servants on the ground were cheering for joy.

There was only an explosion that shattered the eardrums.

In the sky, Tao Chengdao and his device turned into a fireball, quickly falling from the sky...

The first human "astronaut" who wanted to use the thrust of a rocket to go into the sky died at this point, and Tao Chengdao's disciples and servants buried him on Wanjia Mountain...

But Tao Chengdao passed away unfortunately on the way to pursue his dream.

His heroic deeds have been inspiring generation after generation of astronauts in our country, and he has also won the recognition of the world's aerospace industry.

He is internationally recognized as the first pioneer in history to use a manned rocket to try to fly into space. The International Astronomical Union also named a crater on the moon "Wanhu" to commemorate this great man.

If it is said that Wang Bao, Zong Ze, and Zhang Shuye represent the integrity of China.

Then Tao Chengdao embodies the spirit of seeking knowledge and exploration of the sages.

Among these sages, Lao Su, the greatest scientist in the 11th century, is naturally indispensable.

Every time he looked up at the sky, he would have an idea in his mind:

What a wonderful scene it would be if people could fly to the sky and look down on the ground.

Magnificent mountains and rivers, all kinds of world, can be fully seen.

So long, long ago.

He tried to make a wooden kite, trying to use the wind to achieve the effect of going up to the sky, trying to conquer the sky.

However, due to the lack of sufficient knowledge and theory, the idea of wooden kite ascending to heaven ended in failure.

Now with the aging of his body, Lao Su already had a premonition in his heart:

My time is running out, and this obsession probably has no possibility of realization.

I may only be able to say goodbye to the world with regrets in a year or two.

But what he didn't expect was.

With the appearance of Xu Yun, some things seem to have changed indistinctly

airplane?

Is it the flying wheel, or the flying machinery?

Regardless of the above possibilities, can it really take a person to the sky?

To know.

An adult weighs as little as a hundred catties and can weigh more than two hundred catties.

Counting the weight of the load, the most conservative estimate is more than 200 kilograms, right?

Such a heavy object, why can it fly?

But Xu Yun has already proved his ability before, so the credibility of his words is not low.

Afterwards, Old Su paused. Considering the importance of 'Auspiciousness', he decided to learn more about the inside story:

"Xiao Wang, is there a principle that can explain the plane you mentioned?"

"Principle"

Xu Yun thought for a while, and took out two pieces of paper from his body - as mentioned earlier in Fan Lou, he always carried paper and pen with him.

Then he held one end of the paper with both hands and let the paper hang down naturally.

Ask Lao Su and Xiao Zhao:

"Your Highness, Master, do you guys still remember the experiments you did in class?"

Old Su and Xiao Zhao looked at each other with thoughtful expressions on their faces, and said after a while:

"Of course I remember, it seems to be called Bernoulli's principle, right?"

Xu Yun nodded:

"good."

Then he paused and continued:

"Your Highness, sir, since the two of you still remember Bernoulli's principle, is there a certain possibility?"

"For example, change the paper into a fixed object, and use techniques to make it produce a huge difference in the gas flow rate between the upper and lower sides."

"In this way, is it possible to lift objects into the air like a piece of paper floating?"

Students with good memory should still remember.

When Xu Yun first met Xiao Li, he once demonstrated an experiment of blowing paper for her.

Later, Xiao Li specifically asked Xu Yun about this in class, and Xu Yun demonstrated another experiment in high school for the convenience of explanation:

Hold one end of the paper with both hands, let the paper hang down naturally, and then blow air into the middle of the two papers.

Then blow and blow and you will find out.

The two stickers are actually together.

In high school textbooks, the above two experiments will be attributed to Bernoulli's principle:

Look, the flow rate above is high and the pressure is low, so the pieces of paper float up.

But actually.

This is wrong.

The paper blowing that Xu Yun demonstrated to Xiao Li back then had nothing to do with Bernoulli's principle at all.

In fact, this is also a misunderstanding of the most widely spread Bernoulli equation.

Considering the information barriers of some idiots, ahem, lay readers, a brief summary is:

The Bernoulli equation holds along the same streamline, not between different streamlines.

The direction in which the paper sheet deviates does not depend on which side the airflow is at all, but depends on the angle between the direction of the airflow and the paper sheet, and the viscosity.

at first.

The paper hangs vertically.

Blowing air over the paper will take away the air on the right side of the paper because of the viscosity.

This creates an area of low pressure.

Due to the existence of this low-pressure zone, the paper will float to the upper right.

As soon as the paper floats, it will bend the streamline downward.

And finally, the streamline will be closely attached to the paper.

At this time, the flow of air is no longer straight forward, but a downward arc, which is a whirling field.

Therefore, the downward bending streamline will generate centrifugal force, and this centrifugal force will bring the paper up.

The real name of this effect is the Coanda effect, not Bernoulli's principle.

Pretty simple and easy to understand, right?

But in the high school classroom.

When it comes to the principle of airplanes, teachers not only cannot explain the Coanda effect (in fact, quite a few people may not even know that they are wrong), but also often extend the above paper example again.

That is, replace the paper with a wing:

For the wing, the upper surface is more convex, and the speed of the airflow will be greater when it passes over the upper surface.

Therefore, a pressure difference is also produced, and this pressure difference is the source of lift.

With the above explanation plus the paper experiment, most people suddenly understand the principle of the plane flying in the sky:

Oh, it turns out that the principle of the plane is so simple...

Ever since.

A situation of repeated mistakes appeared-the principle of the airplane is Bernoulli's principle.

In fact, if you are willing to think about this statement, you can easily think of two rebuttal questions:

First, why can the aircraft in the air show fly backwards?

Second, a kite is a large flat plate, why can it fly without power?

Of course.

I want to think about these two questions, and it is not recommended to refute the teacher in class.

Otherwise, it is very likely that you will be rewarded with a set of rewards for copying homework as a penalty station, and you may have to be criticized by the head teacher.

all in all.

So far, including Bernoulli's principle, including Newton's third law, including the Ventley effect, including the Kutta-Zukowski law, and many improved laws, it is actually difficult to explain perfectly lift problem.

Why planes can fly is still an unsolved mystery.

It is said that the Nobel Prize is far away. In fact, if many common phenomena in life can be successfully explained, the Nobel Prize is almost at your fingertips.

But on the other hand,

As I said a long time ago:

The Song Dynasty is not the 21st century. For the basic cognition of this era, some concepts do not need to be completely correct.

A more general explanation is easier to understand.

Therefore, when Xu Yun explained the reason, he directly applied Bernoulli's principle to the piece of paper.

That is, in a flowing fluid, the greater the velocity, the lower the pressure.

Now, in order to save some trouble, he continued to extend the paper to the wing, and still put the hat on Bernoulli's principle:

"So if we can provide a large amount of propulsion in a short period of time through some means, it is possible to send the plane into the sky."

"If Cao Min remembers correctly, there is also a skill called the loudspeaker in the Fenglingyue Shadow Sect."

"This object is not big, but it can amplify the voice of ordinary people several times, and it is not troublesome to reproduce it."

"At that time, if His Highness can fly in a plane and speak to the people through the loudspeaker, there will be no need to worry about the residual influence of the deposed emperor."

After hearing Xu Yun's words, Xiao Zhao's eyes lit up immediately.

Although in the legends of the past dynasties, every emperor seems to have a supernatural power.

For example, Liu Bang cuts the white snake, Gao Huan's red light and purple aura, etc. It seems that you can't be an emperor without any vision.

But there is one thing to say.

These so-called anomalies are basically rumors that only emerged after he ascended the throne, and their authenticity is doubtful.

The miracles that really appear in the public eye have always been very rare, and even if there are, there is a high probability that they are just coincidences.

But if he could fly high into the sky during the enthronement ceremony and say 'thunder', that would be a real vision in public!

The effect is definitely countless times higher than any amnesty in the world. In the game, it is the bug effect of +40 people's hearts!

Think here.

Xiao Zhao suddenly couldn't sit still, and quickly asked Xu Yun:

"My lord, I don't know how many materials the plane needs and how long it will take to make it?"

When Xu Yun heard this, he immediately put on a pensive expression.

be honest.

Although he is an old oilman in the DIY circle, it is still difficult to build an airplane by hand in the ancient background.

Just according to the halo prompt.

The heaviest rating of the task is related to technical difficulty, so he had to propose the concept of the aircraft, otherwise he would just build a hot air balloon and finish the job.

Speaking of aircraft, the first thing to mention must be the type.

Generally speaking, aircraft are mainly divided into two categories: jet aircraft and propeller aircraft.

Among them, the propeller plane is the most primitive powered plane, and it is also the kind we see in old movies and documentaries.

It mainly uses the rotation of the propeller to push the air to the rear of the aircraft, and uses its reaction force to push the aircraft forward.

According to the different power, it can also be divided into piston aircraft, turboprop aircraft and so on.

However, some aviation enthusiasts will separate the piston aircraft as a third independent definition of aircraft-the number of these people is not large, and it can only be regarded as an unpopular genre.

Of course.

Although propeller aircraft has a long history, it has not completely withdrawn from the aviation stage at present, and the proportion of active service is about 20%.

Jet aircraft is the current mainstream model, like the civil aviation passenger planes we take now, most of them are jet aircraft.

The classification of jet aircraft is a bit more complicated than that of propeller aircraft.

For example, it can be divided into turbojet, turbofan, turbopropeller and turboshaft, etc.

But don’t look at the plane as it seems to be very tall. If you don’t consider the score, there are several types of hands that are quite easy to rub.

For example, a very simple pulse jet engine.

The English name of this gadget is also called Pulsejet. It was specially used to launch V1 missiles during World War II, and it only hit John Bull.

Although in modern eyes.

Pulsejet has low power, high vibration and noise, unstable work, short life and uncontrollable output power controllable range is very narrow.

But from a technical point of view, the pulse jet engine is too simple:

Its main component is a pipe, not even a seamless steel pipe.

Plug the front of the pipe with a one-way valve to let air in, plug in an oil pump and igniter and you're done.

When starting, use compressed air to flush the front valve, and then cooperate with the ignition, it can be started in an instant.

Xu Yun has used three or four simple Pulsejets in his previous life, and the thrust-to-weight ratio is as high as 500+.

However, considering that this kind of untechnical design has insufficient gold content, the probability of scoring will not be too high, and it may be better than a hot air balloon.

So Xu Yun hesitated again and again, and still made a bold decision:

Design an engine yourself!

be honest.

This is undoubtedly a very difficult approach.

Although Xu Yun has a good understanding of internal combustion, although he did not engage in engine construction in Chengfei after graduation in his previous life, he is familiar with a lot of knowledge.

But to say a thousand words and ten thousand, this is the Song Dynasty after all.

There is no supercomputer, no sophisticated production equipment, and the conditions of later generations are very different.

Other than that.

Flow field analysis, compressor, turbine, rotor synchronization, clearance control, fuel oil, bearings, and even the shape of the combustion chamber can't be wrong.

On the contrary, the extremely difficult blade processing of later generations can be relatively easy, after all, it is only a short time to cope with the enthronement ceremony.

With Da Song's current skill level, it is quite easy to pile up a set of blades with a lifespan of 60 hours with money.

But the whole process was difficult, but Xu Yun had an inexplicable premonition in his heart:

The score of this task is very important, the higher the better, it must not be perfunctory.

This premonition even made him feel a little heavy, as if.

The beneficiary is not only him.

Think here.

He couldn't help raising his head, looked at Xiao Zhao, and said:

"Your Highness, if you want to build an airplane, I'm afraid Cao Min will need a lot of manpower and material support."

Xiao Zhao waved his hand lavishly, he is not a whining person in the first place:

"Prince Wang, just open your mouth!"

Xu Yun thought for a moment and said:

"The first is a large amount of iron ore, craftsmen with basic skills, and a suitable preparation site."

"The second is some rare resources, such as falling stars, and the more the better."

The so-called falling stars refer to meteorites.

In addition to iron and nickel in meteorites, there are also opportunities to find some other rare metals.

Although the content of these metals is not necessarily particularly high.

However, there should be a lot of meteorites accumulated in the treasury of the Song Dynasty, and theoretically there is a high probability that some special resources can be obtained.

As Song Zhezong's younger brother, Xiao Zhao knew a little about some of the storage in the palace, so he readily agreed:

"There are hundreds of falling stars in the palace. The small ones are no more than the size of a nut, while the big ones are as big as a water tank."

"If it's still not enough, this king can still contact the aristocratic families from all over the world, and it will definitely meet the needs of the young master!"

Xu Yun nodded in satisfaction and continued:

"In addition, there are a large number of mathematics bachelors, such as Mr. Tongyu, etc., the more the better."

"As for the time, it will take at least six or seven months."

"Six or seven months."

Xiao Zhao repeated the time and turned to look at Old Su.

Old Su thought for a moment, then said:

"His Royal Highness can take charge of the government temporarily as a state supervisor, not to mention half a year, a year is also fine."

Xu Yun nodded slightly, the answer was within his expectation.

After all, Xiao Zhao has to spend time to accept Zhao Ji's remaining power, which is not so easy.

Even Zhao Ji, who was well-known in history, took more than half a year to get it done.

Then he suddenly thought of something, and added:

"By the way, there is one more thing that needs to be prepared."