"You say you can't handle the length and curvature of the keel?"

Ren Yan half-squinted at Wang Bo and the others in front of him, and subconsciously yawned.

Wang Bo and the others nodded:

"Yes, Mr. Ren."

"We can't find that long wood at all."

"We don't have a five-meter-long piece of wood on the arc, and if you count the arc part, it is conservatively estimated that it will take about 6 meters to be usable."

"So, you're stuck?"

Ren Yan covered his mouth and yawned again, and then he came to his senses slightly.

"Yes, teacher, so do you see any way?"

Wang Bo and the others looked at Ren Yan expectantly.

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

"Did you think of a solution for yourself before you came to me?"

"Yes!"

Wang Yu nodded, and said the ideas of the previous Class 9 and others:

"In terms of length, we can't solve it at all."

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

"But the biggest problem with this is quality."

"Because the curve is too curved, it will lose the original toughness of the wood."

"And just the curvature of a keel is still far from a complete keel."

"We have looked up a lot on the Internet, and the keel used for the boat is all made of a single piece of wood, from the head of the dragon to the crest to the tail of the dragon."

"But at the moment, we obviously can't do that."

Wang Yu said, and the other students nodded in agreement.

Ren Yan changed his sitting posture unhurriedly: "It's a bit of an idea." ”

"Did you check it at some point?"

The crowd nodded.

Ren Yan smiled slightly:

"At some point, I've looked closely, and some of the big wooden boats are just concepts, and more of the manufacturing methods are all transformed from modern industry."

"The keel is basically poured for steel, so naturally you want to make it look like you want to make it look like you want to make it

"But have you ever thought that if ancient shipbuilding was really like modern times, would they really be able to find trees that are guaranteed to be 150 meters old?"

"Even though the natural environment was good in the past, there are still some breakthroughs in trees of this height, not to mention the need to use suitable wood."

"That's... How was the keel made in the Ming Dynasty? ”

Wang Bo let out a little surprised.

"Simple, splicing~" Ren Yan replied casually.

"Splicing?!" The students of Class 9 were shocked:

"Teacher Ren, can that be strong?"

"Those ships are going to sail in the sea, if it is really spliced, then the wave hits, and the keel will not fall apart immediately?"

Class 9 students were unconvinced.

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

Even Ren Yan couldn't believe it at first.

But that's exactly what happened.

This knowledge was recently obtained by Ren Yan through the 'search engine' that came with his brain.

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

A wooden keel, also spliced.

But whenever a big wave hits over, it is considered to be excellent skill if it does not fall apart.

Until...

He saw the 'demo' provided by the system. ’

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

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

Even because of the unique unloading method, this bearing range can be further expanded.

On the other hand, there is a demonstration of another monolithic wooden keel. ’

As soon as the wave approaches its capacity, it will be disconnected from the middle.

Let Ren Yan have a good understanding of what it means to be too rigid and easy to break.

At the same time, he completely changed his own concept.

And in the subsequent thoughts, he gradually understood the reason for this phenomenon.

Now it's time to tell your students.

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

Ren Yan looked at the students of Class 9 with interest, and the corners of his mouth hooked up a smile again:

"Think about you making tables, chairs, and benches on the farm."

"Think about the ancient buildings of our Dragon Country."

"You can often hear about landslides in today's buildings, but have you ever heard about landslides in those ancient buildings?"

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

Then the next moment, he was choked half to death.

"Isn't it because there are so few ancient buildings that have survived to this day, and experts have been maintaining them all the time?"

"Moreover, if this kind of thing really happens, those guards will be responsible, who dares to really say it, and they haven't dealt with it privately?"

Ah Wei said his thoughts very straightforwardly.

The surrounding students looked at it with admiration.

These days, there aren't many guys with such iron heads...

Even Wang Yu, who was more tenacious, cast a look of admiration at Ah Wei.

As for Ren Yan, after coughing dryly twice, he gave a heartfelt compliment to Ah Wei.

"Don't talk like this when you go out in the future, it's easy to be beaten."

Then, he forcibly returned to the topic:

"I'm saying this so that you can experience the spirit?"

"Don't you hear anything from these words?"

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

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

"That's right!" Ren Yan let out a sigh of relief.

Unlucky, someone finally realized what they meant.

"The ancient houses of the Dragon Kingdom are all supported by mortise and tenon structures."

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

"And later, someone did a special study and reproduced the same ancient building for seismic testing."

"The results are also very gratifying, in the highest magnitude 13 earthquake, the ancient house was only translated a few inches, and there was no damage."

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

Ren Yan looked at the students of Class 9 with some curiosity.

The students of Class 9 turned red:

"That's... Haven't we been looking for ancient shipbuilding technology, so we didn't think about it..."

"Moreover, can building a ship be the same as building a house...."

"Stupid~"

Hearing this, Ren Yan glanced at this group of unlucky students:

"The mortise and tenon structure is a kind of knowledge that fits each other, is forced, and borrowed, and who stipulates that they can only be used in houses?"

"It's just that it's used more on the house."

"Why are you so dead-eyed?"

"Now even airplanes have mortise and tenon structures."

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

"Since this level of tremor mortise and tenon can be eaten."

"Do you still think it's too much to use on the keel?"

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

"In fact, in ancient shipbuilding, the mortise and tenon structure was often used on the keel to remove the force transmitted by the waves."

"The monolithic keel you are talking about is used less."

"Only some small boats will use a monolithic keel, because they are used in rivers and lakes, and there will not be too many waves."

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

After that, Ren Yan looked at the students of Class 9.

The students nodded thoughtfully:

"Well, this unloading..."

"You'll have to calculate and test it yourself."

"After studying force analysis for so long, you should also use it in practice."

Ren Yan answered first.

Unstruck by the fact that the Class 9 students continued to ask the next question:

"And what about the curvature of the keel?"

"You can't really let us buckle it out of the wood..."

"That's a good question."

Ren Yan nodded, and continued to throw out the knowledge in his head:

"Regarding the curvature of the wood, it is the stupidest way to do it."

"Not only is it laborious, but the stability is also much worse, and once the force increases, it can easily break."

"So in the curvature of the wood, the method of fumigation is generally adopted."

"Fumigation?" Li Cheng spoke curiously.

Hearing this, he subconsciously thought that he was cooking...

Ren Yan glanced at Li Cheng expressionlessly: "Put away your thoughts, fumigation and smoking are completely two different concepts." ”

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

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

"After fumigation, it is heated and shaped, and then naturally cooled, so that any wood can be transformed into the shape you want."

"But fumigation requires some professional tools, and you obviously didn't take this into account before, and now the warehouse doesn't have that condition at all."

"What then?"

Hearing Ren Yan say this, the students of Class 9 immediately made a bitter face.

I finally made up my mind to ask, but the result was still unsolvable on the day?

Ren Yan waved his hand and sat up from the chair.

"I've been with you for so long, and you should also subconsciously develop in an all-round way."

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

As he spoke, Ren Yan raised his legs and walked towards the outside of the warehouse.

The students of Class 9 glanced at each other and quickly followed.

They knew that their teachers were going to start making things again.

But then again, is there anything else your own teacher wouldn't do?