Ask Sword

In this class, let's learn about the knowledge about model airplanes.

In the large classroom of the Supervisory Building, a young Xuegong teacher stood in front of the stage, nervously flipping through the lesson preparation materials.

His name is Ou Zhiyuan, and he is a sixth-year student at the academy led by Su Feng, a doctor of science.

Su Feng has been busy researching reciprocating piston engines recently, and the development progress has reached a critical juncture. He has no time to give lectures, so he pulls Ou Zhiyuan, who is about to graduate, over to teach the students as an instructor.

It is said that it is a class, but it will not involve too advanced content-because it is necessary for students from other countries who do not have a strong foundation in science to understand it.

Brush pull.

Li Ang flipped through the class notes, still sitting upright—although he was the first to make the airplane model, but with the help of the cultivation system, Su Feng and others also burst out some ideas and ideas that are completely different from those in other worlds, which are worth his attention. .

What's more, Ou Zhiyuan was an intern at the publication office, and he also knew Li Ang before. The relationship is okay.

Seeing Li Ang's serious appearance, the students of Yu State sitting beside them also put away their disappointment and neglect because the teacher in class was not Su Feng, opened the class notes one after another, and put on a posture of listening.

Ou Zhiyuan on the stage nodded gratefully to Li Ang, coughed lightly, used his thoughts to control the chalk to float into the air, and began to write on the blackboard.

Everyone should know that flying model aircraft is the latest invention a year ago. It is a man-made instrument that can fly in the air..

The difference from the flying sword is that the power of the flying sword comes from the spiritual power provided by the monks.

The power of the model aircraft comes from talismans. The talisman generates wind and makes the model airplane fly. There is a layer in the middle.

It is true that due to the different sources of power, the model airplanes at this stage cannot move flexibly like flying swords.

Even a monk who has just entered the air-sensing realm can control a medium-to-large metal model airplane to change its direction through the air with weak thoughts. This is something Feijian cannot do.

More importantly, the model airplane has revealed many new possibilities for us—if the model airplane continues to grow bigger, will it be able to carry people and cargo?

Is it possible for people to sit in the model aircraft and control the steering of the model aircraft directly through the ropes and cables? Just like the driver of the carriage controls the carriage through the reins.

The number of monks in a country is limited, but the number of ordinary people is much, much larger.

If the enlarged model airplane, or airplane, can be manipulated by ordinary people to carry goods, it will be countless times faster than today's horse-drawn carriage.

It is even more efficient than flying sword transportation.

When talking about professional content, Ou Zhiyuan's face immediately showed excitement, and he talked endlessly: Airplanes can carry people and goods, cross dangerous terrain, and travel thousands of miles in a day.

This is something no monk can do.

Moreover, this possibility is completely feasible in the field of mathematics.

He manipulated the chalk and wrote several words on the blackboard.

Lift, pressure, velocity, density, area, lift coefficient.

Lift, as the name suggests, is the force that lifts up. Within the scope of science, we regard air and water as fluids. In air flow and water flow, the faster the flow rate, the smaller the pressure generated by the fluid.

The side with a strong pressure will generate thrust on the side with a small pressure. Model airplane flying and ship sailing are based on this principle,

Why some model airplanes can fly, while others cannot? This is related to the concept called lift coefficient. We use the lift coefficient to measure the flight performance of each model airplane. Its calculation formula is The coefficient of lift equals lift, divided by (speed times speed itself, times wing area times air density times one-half).

The larger the lift coefficient, the more perfect the model's shape theoretically.

Ou Zhiyuan talked eloquently on the stage, and the students in the audience could barely understand him at first, but when he introduced arithmetic and used a lot of mathematical formulas, the students below gradually became numb.

Especially some foreign students.

As for Li Ang, he was once again amazed by the ingenuity of Su Feng and others—they created the wind tunnel by themselves after only listening to a few words from him.

Generate and control airflow in the way of talismans. Place the aircraft model in the wind tunnel for simulation, with the power of thought

Observing the airflow and obtaining a large amount of data,

In turn, it complements fluid mechanics and aerodynamics.

This is exactly what Li Ang has always hoped to see - to replace the vague, emotional, empiric part of traditional practice with logical and rational mathematics.

Experience is extremely personal, written in a book will be distorted,

Mathematics, on the other hand, is a formal science that anyone can learn, verify, and get the same results.

Newton's law of viscosity, Bernoulli equation, Euler equation, Navier-Stokes equation, Kutta-Zhukovsky condition, fluid continuity theory.

As long as it continues to develop, there will be aerodynamics, and there will be large aircraft.

The future of aeromodelling is infinitely bright.

With a smile, Ou Zhiyuan took out a delicate model airplane with two-winged propellers from under the podium, pushed it lightly, and made it hover in the air in the classroom, attracting exclamations from the audience.

Tomorrow and the day after tomorrow, there should be an engineering subject in everyone's class schedule. Then you can apply to the engineering teacher to make a model airplane of your own.

Pfft.

A chuckle came from nowhere, breaking the curious atmosphere in the classroom.

Ou Zhiyuan suppressed his smile slightly, and looked towards the direction from which the laughter came from, Does any of you students have any questions you want to ask?

Professor Ou, I have a question.

Bian Chenpei stood up, twitched his lips slightly and asked, You said that the future of model airplanes is infinitely bright.

Can this model airplane guard against spiritual intrusion?

Can it resist mind attack?

Even if you don't talk about talismans and spells, I'm afraid it can't even resist the arrows on the battlefield, right?

. Bian Chenpei, right?

Ou Zhiyuan frowned, Aeromodelling will not be used in war, and it has no direct competition with Feijian. The two focus on different things.

Then it is used in the field of people's livelihood,

Bian Chenpei asked: How much is the talisman used by the model aircraft worth? What level of talisman do you need to write it?

What level of Psychic manipulation is required?

If you enlarge the model aircraft to achieve the effect of carrying people and cargo you mentioned, how many times will the weight be increased?

Does it mean that every time you use it, you have to ask the Zhuxiao Realm Talisman to write the talisman?

Bian Chenpei's question caused many foreign students to have thoughtful expressions on their faces.

They were also surprised by the hovering ability of the model airplane just now, but after thinking about it carefully, isn't the power that drives the model airplane still the talisman?

Talismans can only be written by talisman masters, and the energy and spiritual power of talisman masters are limited.

If it is a large aircraft model, it needs to consume Talisman,

So what is the difference between the advantages Ou Zhiyuan mentioned and Feijian?

this

Ou Zhiyuan opened his mouth, and when he saw the Taihaoshan costume on Bian Chenpei, he immediately reacted.

The Haotian Daomen couldn't understand the Neo-Confucianism studied in the academy, and the current model airplane is a tool that can carry monks and even ordinary people in the sky.

Devout Haotian believers would not be willing to see flying machines all over the sky above Haotian Taoist temple.

Thinking of this, Ou Zhiyuan's rebuttal words were also stuck in his throat, unable to speak.

From this point of view, the so-called model airplanes in the Academy are nothing more than large-scale toys with strange skills and tricks. It is nowhere in sight to carry people and objects.

Bian Chenpei raised a winner's smile at the corner of his mouth, and was about to sit down.

Oh, is it?

From the other end of the classroom, Li Ang's voice came.