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Why, why can’t I understand after you said it?

Yan Ruyu, who was smart since childhood, could not bear this. She said unconvincedly: "Don't be too confident, as long as you say it, I will understand."

Renault sounded funny. He wanted to tease Yan Ruyu. This girl has a good personality and makes people feel close. It is not like Mo Yu and the others, it is too classic.

It was the first time I approached a classical beauty and felt quite good. While sighing at the strength of the beauty on earth, I enjoyed the tenderness of the classical beauty. But over time, Renault discovered that the classical beauty was like a fake, making him unable to feel the realism.

Like a dummy, like a puppet, or even a bit like an inflatable doll, without flesh and blood, even the soul is short of weight.

Gong Churui and Feng Moyu both had a hint of wildness, but after knowing their identity, they all turned into puppets.

"So, if you want to hear it, I will say, don't worry if you don't understand it. Don't let me explain many things, it's too troublesome to explain a word for a few days." Renault looked at Yan Ruyu and said with a smile.

"Okay, you said that, I'll listen." Yan Ruyu said angrily.

"Okay, there are only three types of flight. The first is lift greater than gravity, the second is air pressure difference, and the third is maglev. In addition, there is an older saying that substances that are lighter than air can fly."

Renault is a pure heart that makes people bad. His mouth is full of terms. If these words are placed on the earth, they can understand them at the junior high school level. Elementary school students who have a lot of knowledge can also understand some of them. If they are placed on Da Chu, let alone Yan Ruyu, who is exploring secret techniques, is also confused when she changes to Bai Jing.

Sure enough, after listening to Renault's words, Yan Ruyu was in a bad mood. What did you say? I can't even understand a word for Mao?

Lift, gravity, air pressure, maglev, and what are air?

After appreciating the picture of the Ten Breaths of Beauty, Renault continued, "Don't say I bullied you, I'll explain to you the simplest. Do you know what air is?"

Yan Ruyu shook her head.

Renault reached out and pointed around: "Air is a mixed gas that exists in the atmosphere of the planet, everywhere and every time we breathe, we will inhale part of the gas, absorb what we need, and exhale what we don't need. Do you understand?"

Yan Ruyu was even more confused. Not only did she not understand, but she led to more questions: what is mixed gas, what we need, and what we don’t need...

I knew it would be like this, but Renault would not explain it. When he was guiding Cui Qing, Princess Ninth, Zhang Tan and others in the past, Renault discovered this problem. If he wanted to explain one problem, it could lead to countless problems. This is a manifestation of the extreme lack of basic knowledge. Without completing basic education, many things cannot be explained.

"If you don't understand, it doesn't matter if you don't understand. Let's make some things first, experience them while experimenting, look with your eyes, and think with your heart. You have paper and pen here, take it over." The proud Miss Yan obediently took the paper and pen.

Renault picked up the pen and drew it without thinking at all. In fact, he had thought about this thing many times in his mind. When he saw Yan Ruyu's big kite, he suddenly had an idea that something he originally thought was impossible could be realized in the world of Da Chu.

Half an hour later, a sketch of a biplane propeller plane was finished.

This type of antique aircraft can be seen in history books. The wings are two layers above and below, which look clumsy. In actual flight, it is indeed clumsy, slow to climb, slow to react, and has many shortcomings.

Of course, there are also advantages. Double-layer wings can increase the area of ​​the wing, and the power, wing area, and lift are directly related to the lift. When the power is insufficient, increasing the wing area will easily obtain more lift.

Renault cannot manufacture engines, so this biplane is manpowered. Except for the propeller and transmission part, no metal is required for other components, which can reduce the weight of the aircraft as much as possible.

After the drawing, Renault marked the size on the wing and fuselage.

"Did you see it? Let your people make this kind of thing, and I let you make other parts. The materials should be solid and lighter. The lighter the better, do you understand?"

"It's like a kite?" Yan Ruyu was still very smart. As soon as Renault said it, she understood. She really made kites a lot. She tried all kinds of materials, and finally found that it was the best to use bamboo.

"You can understand this way that the force it receives is much greater than that of a kite. Your kite should be a brace made of bamboo, and it will not work on the plane. If it can be done well within ten days, it will be sent to the Temple of Shengong." After Renault said that, he put down his paper and pen, walked out of the tent, jumped onto the back of Ziying. Through the God of Wealth, he had seen Huya and his group looking for him everywhere.

Back at the Temple of Shengong, Renault began to recruit people to work, propellers, foot pedals, transmission chains, gear structure groups, and other things. With previous experience, it is still quite difficult to make, and the requirements are much higher than the previous wind drums.

All of this was only barely completed by Renault’s continuous reduction of requirements. According to his original plan, he had to change at least three gears. After all, it was manpower and only had one gear. No matter how fast the person stepped on the pedal, the power provided was limited.

Facts have proved that the metal craftsmanship level of Dachu is really poor. Not to mention the third gear shift, even Renault's lowest requirements are particularly difficult to manufacture.

Yan Ruyu should have a group of good craftsmen under her. Ten days later, she brought two sets of double-layer wings. Renault took a look and found that the quality was better than he thought. The total weight of the two pairs of wings was only over 150 kilograms, which was lighter than he expected.

With Yan Ruyu's subordinates joining, the project progress is much faster and errors are inevitable. After repeated experiments, the assembly was finally completed after more than a month.

Looking at the biplane manned aircraft parked in the open space, Renault was quite satisfied, but now it is not the time to be happy. Whether this game can go to the sky still needs to be tested.

The conditions of Dachu are limited, so you don’t have to consider any material strength test or wind tunnel experiment. Just do it with your arms.

Renault didn't expect this game to fly as high as it can or as fast as it can fly. It is said that the world's first plane flew only a few dozen meters away during its first test flight, which was far worse than Yan Ruyu's big kite, let alone hot air balloons.

In fact, with Renault's current resources, it can create a simple hot air balloon. The problem is that Renault doesn't like it. Simple hot air balloons are almost uncontrollable. They are something to eat when the wind blows. They run wherever the wind blows.

The seats, wings, and fuselage are all made of Yan Ruyu, which is a kind of wood called hollow wood. This wood has a very low density, but its strength is not bad, and it has excellent toughness.

The metal part is steel smelted by Renault himself. When processing parts, hundreds of blacksmiths worked day and night under the command of Zhang Tan. In Renault's opinion, the work difference is so big that it makes people speechless. It can only be said that it can be used barely. As for how long it can be used, it depends on how much face God will give.

There are multiple movable wing plates on the wings, which can control the up and down airflow, form air pressure difference, and increase lift. At the same time, it can also control the aircraft to rise, fall, and turn.

The aircraft's landing gear is naturally fixed, and the tires are made of resin materials. Many of the materials in Dachu are quite good. This resin selected from hundreds of resins has excellent elasticity. In Renault's view, it is better than rubber.

A large group of people rushed out of the Temple of Divine Works and pulled the first human biplane of the Great Chu, and rushed towards the Yulin Military Academy outside the city. The ground there was relatively flat and there was no need for Renault to build an airport.

In fact, biplane like this has very low requirements for airports. In an emergency, even landings in rice fields can be forced.

Such a big movement naturally attracted the attention of many people. The Political Affairs Hall sent people to check it out. Wei Wenchang was the first to arrive at the school military field. Looking at the strange biplane, he was meditating and silent.

"Li Si came over and sat in this position. Did you see the pedal under your feet? You have to step hard, don't be anxious, don't step on it now, wait for me to finish..."

Test pilot Li Si, this was something Renault had thought long ago. Li Si was the master, with a long vein and extremely strong force. Renault was not worried that he would not have the strength, but was afraid that this guy would break the pedal and chain with force. In order to make these things, Zhang Tan lost ten kilograms.

"This is the joystick. When flying upwards, pull back. Don't pull too fast. Come a little bit, push forward when landing. When turning, don't hurry or go to the right. Do not worry. Be slow. At the same time, don't forget that the power of the plane comes from the pedal under your feet. The faster you step, the stronger the power."

The Yulin Army's large colony site is very large, and it can accommodate 200,000 cavalry warriors at the same time, with a length of more than five kilometers. Not to mention biplane, as long as the ground is flat enough, even large transport aircraft will take off and land, which is just right for Li Si to practice.

After half an hour of jet burst training, the first Grand Master-level test pilot in Dachu completed the preliminary training, and it depends on his own understanding. Renault is not worried about his safety. With his Grand Master's combat power, even if he falls from a sky dozens of meters high, he will not hurt him at all. Renault is even more worried that the plane will not be broken. He has been busy with this plane.

There is no way, there is nothing to do during this period. Yuxi has to guard Liaodong and intimidate Guiji, so he has no way to take action. If he doesn't take action, Renault will have no energy to absorb. The few units of energy in his hand have been used as backups and dare not use it.

The radio is miniaturizing, and it is enough to leave this matter to Cui Qing and Zhang Tan. He is not enough for the time being. In the past month, Renault has been devoted to building an airplane. Renault really wants to try whether he can build an air force in Dachu.

According to his tests and calculations, the ninth-grade warrior is enough to bear the heavy responsibility of human engines. If he does not pursue speed and durability, the seventh-grade warrior can barely do it.

The number of warriors above the seventh grade is still quite considerable.

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