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Chapter 266 Mortise and tenon and fumigation 【Subscription】

"You said the length and radian of the keel can't be fixed?"

Ren Yan looked at Wang Bo and the others with half-closed eyes, and subconsciously yawned.

Wang Bo and others nodded:

"Yes, Teacher Ren."

"We simply can't find timber that long in terms of length."

"We don't have wood that is five meters long on the arc, and counting the arc, it is conservatively estimated that it will take about 6 meters to be usable."

"So, you're stuck?"

Ren Yan covered her mouth and yawned again, only then did she wake up slightly.

"Yes, sir, so do you think there is any way?"

Wang Bo and others looked forward to watching Ren Yan.

But Ren Yan didn't answer directly, but instead asked the group of students in front of him:

"Before you came to me, did you think of a solution yourself?"

"Have!"

Wang Yu nodded, and said the idea of ​​Class Nine and others in the future:
"In terms of length, we can't solve it at all."

"But in terms of arc, although there seems to be a difference of about one meter, if the overall volume of the wood is considered, it is not impossible to deduct another one."

"However, in doing so, the biggest problem is quality."

"Because the radian makes it too bent, it will lose the original toughness of the wood."

"And there is only a radian of the keel, and there is still a big gap from the complete keel."

"We made a lot of inquiries on the Internet. The keel used for ships is formed from a single piece of wood, from the dragon's head to the dragon's spine to the dragon's tail.

"But right now, we clearly can't do that."

After Wang Yu finished speaking, the other students nodded in agreement.

Ren Yan calmly changed her sitting position: "I still have some ideas."

"Did you check it on a certain website?"

The crowd nodded.

Ren Yan smiled slightly:

"Sometimes I have read it carefully. There are only concepts about large wooden ships, and more manufacturing methods are all transformed from modern industry."

"The keel is basically made of steel, so it's natural to want to make it what it looks like."

"But have you ever thought about it, if ancient shipbuilding really came about like modern times, would they really be able to find trees with a minimum guarantee of 50 [-] meters?"

"Even if the natural environment was good in the past, trees of this height still break the limit, not to mention the need to use suitable wood."

"Then how did the Ming Dynasty make dragon bones?"

Wang Bo made a sound in surprise.

"Simple, splicing~" Ren Yan replied casually.

"Stitching?!" The students of Class Nine were shocked:
"Teacher Ren, can it be strong?"

"Those ships are going to sail in the sea. If they are really spliced, won't the keels fall apart immediately when a wave hits?"

The students in Class Nine were unconvinced.

Not only them, netizens and judges also don't believe it.

Even Ren Yan couldn't believe this at first.

But this is indeed the truth.

This bit of knowledge was obtained by Ren Yan recently through the 'search engine' built into her brain.

At first he scoffed at this statement completely, and also thought it was a fantasy.

A wooden keel, also spliced.

As long as a big wave hits the past, if it doesn't fall apart, it is considered a superb skill.

until
He saw the 'demo picture' provided by the system. '

In the picture, the wave hits the splicing keel, but the splicing keel relieves force because of the mutual fit between the splicing points. Although it looks extremely dangerous, it is actually as stable as an old dog.

As long as the wave is within the acceptable range of wood quality, no matter how big it is, it can all resist it.

Even because of the unique way of unloading the force, the range of this kind of tolerance can be further enlarged.

On the other hand, another demo picture of the whole wooden keel. '

Once the wave reaches its capacity, it breaks with a bang in the middle.

Let Ren Yan have a good understanding of what is too hard and easy to break.

At the same time, he completely changed his concept.

And after thinking about it later, he gradually understood the reason for this phenomenon.

Now it's time to tell my students.

"Who told you that splicing must not be strong?"

Ren Yan looked at the students of Class Nine with interest, and smiled again at the corner of her mouth:
"Think about when you guys make tables, chairs and benches on the farm."

"Think about those ancient buildings in our Dragon Kingdom."

"You can often hear news of landslides in buildings today, but have you ever heard of landslides in those ancient buildings?"

After all, Ren Yan waited for the student's answer.

Then the next moment, he was choked to death.

"Isn't it because there are too few ancient buildings left to this day, and experts have been maintaining them?"

"Besides, if this kind of thing really happens, those guards will be held accountable. Who would dare to really say it? Didn't they handle it privately?"

Awei spoke his mind very frankly.

The surrounding students looked over in admiration.

These days, there aren't many guys with such strong heads.
Even Wang Yu, who is relatively stubborn, cast admiring eyes on A Wei.

As for Ren Yan, after coughing twice, she sincerely praised Ah Wei.

"Don't talk like that when you go out in the future, you will be beaten easily."

Then, he forcibly changed the subject:

"I said this to let you understand the spirit?"

"Don't you hear the meaning from these words?"

Ren Yan asked again, and after a while, Xia Yue answered tentatively:

"Teacher Ren, you mean the mortise and tenon structure?"

"That's right!" Ren Yan let out a long breath.

Unfortunately, someone finally realized what he meant.

"The ancient houses in the Dragon Kingdom were all supported by mortise and tenon structures."

"Like a giant figure, lying on the ground."

"And later, someone did special research and reproduced the same ancient building for earthquake testing."

"The results are also very gratifying. During the earthquake with the highest magnitude of [-], the ancient houses were only shifted by a few inches, and no damage occurred."

"I remember telling you about this, why didn't I think of it?"

Ren Yan looked at the students of Class Nine curiously.

The students in class nine blushed:
"That... We've been looking for ancient shipbuilding technology, so we didn't think about it"

"Also, can building a boat be the same as building a house?"

"Stupid~"

Hearing this, Ren Yan took a look at these unlucky students:
"The mortise and tenon structure is a kind of knowledge of mutual fit, force bearing and borrowing. Who stipulates that they can only be used in houses?"

"It's just that it is used more in houses."

"Why are you so stubborn?"

"Even airplanes now have mortise and tenon structures."

"They are often applied to the propellers of aircraft to achieve the effect of mutual fit and unloading, so as to reduce the loss of aircraft propellers."

"Since this level of trembling mortise and tenon joints can bear it."

"Do you still think it can't be used on the keel?"

Speaking of this, Ren Yan paused and sorted out his thoughts:

"In fact, in ancient shipbuilding, mortise and tenon structures were often used on the keel to relieve the force transmitted by the waves."

"The overall shape of the keel you mentioned is less used."

"Only some small boats use integral keels, because they are used in rivers and lakes without too much waves."

"With this kind of thinking, do you still think that the problem of the keel is difficult to solve?"

After all, Ren Yan looked at the students in Class Nine.

The students nodded thoughtfully:

"Then, this unloading force."

"It's up to you to calculate and experiment by yourself."

"After studying force analysis for so long, it's time for you to apply it in practice."

Ren Yan answered first.

The students in Class Nine were not surprised at all, and continued to ask the next question:
"Then, what about the curvature of the keel?"

"Can't really let us buckle from the wood"

"That's a good question."

Ren Yan nodded, and continued to throw out the knowledge in her brain:

"About the curvature of the wood, it is the stupidest way to buckle it out abruptly."

"Not only is it laborious, but the stability is also much worse. Once the strength is intensified, it will be easily damaged."

"So on the curvature of the wood, the method of fumigation is generally used."

"Fumigation?" Li Cheng asked curiously.

Hearing this, he subconsciously thought it was cooking.
Ren Yan glanced at Li Cheng expressionlessly: "Put away your thoughts, fumigation and smoking are completely two concepts."

"Wood fumigation is generally used to make its internal structure loose and easy to process."

"It's actually the same way as wrought iron."

"After fumigation, it is heated and shaped, and then cooled naturally. After such a set of efforts, any wood can be turned into the shape you want."

"However, fumigation requires some professional tools. You obviously didn't consider this before. Now the warehouse does not have such conditions at all."

"What should I do?"

Hearing what Ren Yan said, the students in Class Nine immediately put on a hard face.

After finally making up my mind to ask, the result is still unsolvable that day?
Ren Yan waved his hand and sat up from the chair.

"It's taken you for so long, you should also subconsciously develop in an all-round way."

"Since there is no such condition for fumigation now, can't we make one?"

While speaking, Ren Yan raised her legs and walked out of the warehouse.

After the students of class nine looked at each other, they quickly followed outside.

They knew that their teacher was going to start making things again.

But having said that, is there anything that my teacher can't do now?
(End of this chapter)