Daming: If I find a great-grandson, I will teach an emperor through the ages

Chapter 45 Another method, helicopter

[Countdown to return: 322 days, 14 hours, 45 minutes and 39 seconds]

This is already the second day after Cao Wei returned home.

The wound on the back of Cao Wei's head has begun to itch slightly, which is a sign that the wound is healing. I have to say that the golden sore medicine in King Yan's hand is really useful. It has only been two days.

After everything came to an end, Cao Wei began to think about what other knowledge he could give to Cao Ying.

To be honest, Cao Wei's reserve of modern technological knowledge is really not much.

In his previous life, he only completed nine years of compulsory education, followed by three years of high school, and dropped out of college halfway through.

Because he had no father or mother in his previous life, he was unable to support himself through college.

Cao Wei left school and had no choice but to work in a martial arts gym.

There is a weird old man in the martial arts gym, Cao Wei learned Bajiquan from him.

In his previous life, when he practiced Bajiquan for two and a half years, Cao Wei was provoked by a Taekwondo student from the martial arts school. Then Cao Wei deliberately punched the person and gave him a concussion.

That guy seems to have a black belt or something...

From then on, Cao Wei knew the power of Bajiquan, so he kept practicing it after traveling to Daming, on the one hand for self-protection, and on the other hand for strengthening his body.

This is the situation. Cao Wei is not a professional engineering student. He usually has a lot of weird ideas, but when he starts to think about it seriously, he becomes completely clueless.

In fact, if we say that there are many things that can be realized in Ming Dynasty in later generations, at least soap, glass, rubber and so on can be done.

Even improving the artillery and making muskets that are more convenient and have a longer range... although it is a bit difficult, it is not impossible.

"Father." While Cao Wei was thinking, Cao Ying came to him.

Today, Cao Ying has restored her clean and neat image of the past.

"Father, you told me before that besides making huge Kongming lanterns, there is another way to take people to heaven. What is the method, can you tell me now?"

Cao Ying once asked this question. At that time, Cao Wei only told him that the time had not come, because the steam engine had not been built at that time...

Although the current development of steam engines is not considered successful, at least Cao Ying already knows what a steam engine is and what it is used for.

"Okay, I'll talk to you today, my father." Cao Wei stood up, but cared about himself, and walked out of the courtyard under Cao Ying's puzzled eyes.

After a while, Cao Wei came back, holding two thin pieces of bamboo and a small wooden stick.

Then Cao Wei took a small knife and began to sit there and carve something on the small wooden stick.

Cao Ying couldn't help being curious, and leaned forward.

"Father, what are you doing?"

"You'll know in a while." Cao Wei smiled at him mysteriously.

He carved two very narrow grooves on the wooden stick, then cut the bamboo pieces into suitable sizes and shapes, and then inserted the bamboo pieces into the grooves on the wooden stick.

At this time, Cao Ying finally understood that what Cao Wei was doing was just a bamboo dragonfly.

Cao Wei held the bamboo dragonfly in his hand, rubbed it gently, and the bamboo dragonfly slowly flew up.

"Father, this..." Cao Ying couldn't understand what Cao Wei meant.

"Ying'er, do you remember the steam engine you made before?" Cao Wei asked.

Cao Ying nodded, "Remember, the steam engine didn't succeed due to some reasons."

Cao Wei touched his nose awkwardly, "That was just an accident. With a little more effort, we will definitely be able to create a steam engine that can run smoothly."

"Well, the boy believed in his father, and the boy also felt that the steam engine was a success just by a little bit that day."

Cao Wei took the bamboo dragonfly that fell to the ground back into his hands, "Since this is the case, Yinger, you can think about it, if we enlarge the two wings of the bamboo dragonfly and make them of steel, and then rotate it at a high speed, Can't you carry something of a certain weight and fly into the sky?"

Cao Ying's eyes widened, her face full of disbelief!

Bamboo dragonfly wings made of steel?

"Do you want to make it as big as a house?"

"That's not necessary," Cao Wei shook his head, "But it's not too small."

"Look, Ying'er," he held the bamboo dragonfly in front of his eyes: "The two wings of the bamboo dragonfly are slanted, and they fly up when they turn forward, and they fall faster when they turn backward."

"This is because the effects of force are mutual. When the bamboo dragonfly's wings rotate, they will generate upward lift according to the resistance of the air. If they continue to rotate, there will be continuous lift."

"The role of force? Interaction?" Cao Ying heard unfamiliar words again.

Cao Wei looked at him, "Use your right hand to hit your left arm."

Cao Ying did as he was told and raised his hand to take the photo.

"Crack," a sound.

"Does your arm hurt?"

Cao Ying nodded.

"Where's the palm of my right hand?"

"It doesn't hurt, just a little numb."

Cao Wei thought for a while and then said:
"If you hit the tree with more force, only your hand will hurt. But have you ever thought about why your hand hurts when your palm falls on the tree?"

Cao Ying nodded in amazement, "This is what my father said, is the effect of force mutual?"

"Yes, there is also the resistance of the air...it is also the reason why the bamboo dragonfly can fly."

"The reason why a piece of wood can float on the water is because the two have different densities, so the water gives it buoyancy. If you press it down with your hands, you will feel the resistance caused by the buoyancy."

"The same is true for air. It is invisible and intangible, but it does exist. You can feel the flow of air when you wave your arms or run."

Cao Ying waved her arms and really felt the air flowing through her hair.

"And when we use a fan to fan the air, we can also feel the resistance brought by the air."

"This resistance is because you exert pressure on the air, and according to the mutual effect of force, the air will also return the same force to the object that exerts pressure on it."

"What I just said is that the lift generated by the rotation of the bamboo dragonfly's wings comes from this."

"I understand, father, so you said that the wings should be made of steel and be big enough, because this can obtain greater lift. If the lift is too large, wood will not be able to withstand the force, so steel should be used. Production." Cao Ying stared at Cao Wei with wide eyes.

Cao Wei gave him a thumbs up, "Ying'er is so smart."

Cao Ying was praised by her father and continued to think along her train of thought.

"However, it is impossible to rely on manpower to rotate the huge steel wings at high speed, so a steam engine is used, and a gear set and a pulley set are also used to improve efficiency."

Cao Wei looked at Cao Ying who was thinking, with surprise in his eyes.

Cao Ying's comprehension ability is really against the sky!
Not only can you understand one point, but you can also draw inferences from one instance...

That is to say, Cao Ying is smart enough and has extraordinary talents. If he meets someone who is dull, it is hard to say whether he can understand him smoothly with Cao Wei's teaching level...

(End of this chapter)