Seeing this, Ren Yan immediately gave the other party a big roll of his eyes.

"Have you ever played with a paper boat?"

"A piece of paper can be waterproof even if it is cracked after being folded many times, let alone wood."

"And..."

"Everything you can make before is already called keels and ribs..."

"You've seen that kind of creature with bones growing on the outside, and it's not a shell, of course it's going to grow in the body~"

"Can you use your brain?"

"You're saying that the silhouette of the ship needs to be wrapped? Include all the keels and ribs and stuff like that? Wang Bo asked in surprise.

Ren Yan nodded: "It's not all, at least the spine bone of your main keel should be exposed, it is the main body of everything and the main heaviness, and it can't be wrapped inside the hull." ”

"But the other ribs, they are the support of the ship's 'flesh', and the flesh needs to grow on top of them."

"And what about flesh and blood? You also need a layer of keratin and skin, and only in this way can you really prevent all foreign objects. ”

"Therefore, the ancient hull is not a layer at all."

"Sometimes, the naming of an object can fully appreciate its usefulness, you have to think about it a lot, don't just see the image in front of you, you have to find the inside."

"But... Can the two-story hull structure really be floated by the sea and supported by the keel? ”

"They're not a heavyweight at all."

"And, even if there are two floors, won't the gaps still exist?"

"The boat made of paper is a whole, and strictly speaking, it has no gaps."

In the end, Xu Kai still asked this question very confused.

He couldn't figure out how.

Hearing this, Ren Yan sat up from the chair, picked up a piece of wood scattered and had bark and carefully buckled it:

"See, something as rough as the bark can prevent moisture and protect the trunk inside, and the reason is because there is a connection between the bark and the trunk."

"It's just like our skin, and since we can't make a direct connection, why not add another layer."

"A layer of things that is mainly used to prevent moisture loss."

"Haven't you done this before?"

"You mean, gum?" Xu Kai was stunned.

"Or else?" Ren Yan casually threw away the wood.

"The two-layer structure, with a specific waterproof layer in the middle, is connected by mortise and tenon joints on the inside and outside, leaving a certain staggered space, and finally it is painted, so that the sea water can be completely isolated?"

"After that, as long as you check it regularly and make repairs, it will be able to run for a long time."

"Everything in the universe, so many wonderful things, any point can open up your thinking, don't always think about solving problems in a given way."

"As for the weight you just mentioned, it depends on your material selection and calculation."

"As long as the whole is conserved, it is impossible for the ship to sink."

With that, Ren Yan threw himself into the recliner again, flipped through his mobile phone and began to find out where there was a chance for a sailboat trial.

By the way, I asked for the specific time of the invitation sent out when I first arrived at the warehouse.

He really felt like he was stretched thin by himself right now.

Now it's just the second step in shipbuilding, and the ninth class has encountered so many problems.

I can only talk about it at most, and if I really want to go into every detail, I definitely can't do it.

And....

Thinking of this, Ren Yan glanced at the full warehouse.

Now this warehouse is really a bit small...

As for the people in Class 9, they were slightly stunned.

looked at the wood thrown down by Ren Yan when he opened the bark and was stunned.

Such a hull problem was really solved with such a piece of wood?

They always find it a little hard to believe, but after simulating it in their minds, they realize that this method is really possible.

The principles involved are simple and straightforward.

It's just a comparison of a ship to a creature, and a hull to skin.

And what they have to do is to add this metaphor layer by layer according to the appearance of the 'creature' in their minds, so that it will slowly become a 'living thing'.

This suddenly gave them a sense of 'creating' rather than simply building.

At this moment, the students of Class 9 completely changed the preconceived notions in their minds, and more ingenuity gradually brewed in their hearts.

They know how to build this hull!

After thanking Ren Yan, Class 9 returned to work again.

According to the hint Ren Yan just gave, a new work was launched.

First of all, there is the issue of materials.

Since two layers are required, and special bonding is required in the middle, the choice of material must be as light and tough as possible, and the degree of adhesion with gum should also be taken into account.

In various experiments and practices, the surveying and mapping team finally selected pine wood.

This thing is known as an evergreen tree, and its toughness is excellent, and because of its unique material, the wood is firm and light, and the combination with the gum is also good.

It is considered the most perfect material of wood today.

As for the mortise and tenon joints that are needed later.

The production team also came up with a new method, since the mortise and tenon joints of the keel class could not be used.

They simply started thinking directly with the way of thinking that Ren Yan had just taught.

A small specially treated pin is added to each mortise and tenon joint as much as possible, so that it can play a role in dispersing force while making a precise connection.

They call it 'tendon'.

This kind of rib will be spread throughout the inner and outer layers of the hull, and the dispersion effect of one may not be visible, but the number is large, and the effect will not be much worse than that of the keel.

It's a special structure that they've racked their brains to come up with.

On the outside, it looks like an ordinary ancient ship, but on the inside it is very different.

After some sample tests, Class 9 decided that there was no big problem with the entire hull bearing a weight of 500 kilograms.

Xu Kai even recorded this structure completely in the shipbuilding drawings.

With the deduction and calculation of the whole class of the ninth class is a realistic simulation, although the hull still has not erected a plank, the progress is officially on the right track.

After that, they were all busy with the hull of the ship.

From time to time, new problems arise.

But after a complete turn of their minds, they did not encounter real difficulties, and they were still proceeding in an orderly manner.

And in order for the quality to really pass, they have to test every time they complete the splicing of a plank.

The most done is the waterproof test.

They also deliberately made a large bucket of seawater for this purpose.

Only when the newly erected planks were able to hold back twenty-one splashes of seawater without any leakage would they consider it passable.

and will be divided on a unique mark.

Of course, this test is only under construction, and after the first layer is built, they will also conduct a complete test.

But then it will be in the sea, and they are looking forward to it.

I am also very glad that the warehouse rented by Mr. Ren has a seawater shipbuilding area on one side, otherwise it will be a problem to let a small half of the ship enter the sea.

The days, in this situation with a clear goal, passed for two days.

Two days later, the bottom warehouse on the first floor, which was about one meter high, was completely completed by Class 9.

The glue is painted, and the waterproof, moisture-proof and insect-proof measures are complete.

On the side of the shipbuilding area near the sea, the ninth class laid a large amount of rolling logs, which supported the half-built ship from high to low, and pushed the ship that gave them their expectations into the sea with a sound of cooperation.

When the waves splashed, everyone felt a strong sense of accomplishment.

After about a month, the boat they built in nine shifts finally went to sea.

Although it can still only be regarded as an embryo now, it can be called a ship after all.

In addition to this sense of achievement, the rest of Class 9 is just worried.

Worried about whether the ship would be able to really float on the ocean as they expected.

The rope used to secure the ship was already tied to a corner of the warehouse.

In the tension and prayer of Class 9, time passed minute by minute.

Even netizens and judges have some different emotions in their hearts.

They wanted the ship to float steadily.

Even though some of them opposed Ren Yan's plan to 'go to sea' before, it is still the case now.

But at the moment, they really hope from the bottom of their hearts that the ship will succeed.

These days, they have witnessed the efforts of Class 9, and they don't want that effort to be wasted.

Even if this kind of effort will bring 'hidden dangers' for things to come. ’

But they still hope that they feel in their hearts that this group of children in recent days is 'deserving' such success.

As for going to sea, it is not the same thing as the emotions of the present.

In the parent group, the parents who farted and chatted for a long time also fell silent.

There was an influx of 'digital' users in the live stream.

The General Administration of Education, Ding Guoxiang is also watching this scene intently.

Everyone has a hint of anticipation.

Ren Yan also stared at everything in front of him.

As the minutes ticked by, it was as if everyone was holding their breath.

The entire warehouse was unusually quiet.

One point, two points...

Five points, ten points...

There are still no signs of wetting inside the ship.

It wasn't until forty-five minutes later that Class Nine let out an excited cry.

The whole warehouse immediately became noisy.

There are also many students who hugged the classmates next to them and took a sip.

After all, such a long time of hard work has not been in vain!

Forty-five minutes is the main time frame for their test.

At the same time, this time is also the time they calculated that the paint and gum will fail to fall off in the seawater.

As long as there is no water seepage after this time, it can mean that there is no problem with their ship as a whole!

It seems to have been infected by Class 9.

All kinds of netizens and judges also smiled heartily.

In the live broadcast room, all kinds of [Class Nine] barrages kept flashing.

In the broadcast room, the praise of the judges was also unstingy.

However, when they boasted, they found that something seemed to be wrong.

Why is it that for such a long time, Ren Yan, who is a teacher, doesn't mean to be happy for half a day?

Instead, he looked at Class 9 with an indescribable 'sympathy? ’

'What is the situation?' ’

Everyone was startled, and once again looked carefully at the 'small half' ship on the screen.

Immediately afterward, their smiles stopped, and they changed to an unusually tangled look.

Damn, this boat seems to be missing something...

No wonder it looks so awkward...

At this time, Class Nine followed Ren Yan's eyes and seemed to be aware of this problem.

They looked at each other with a dejected and speechless expression, and then looked at Xu Kai in unison.

"Made, where are the sails!

！ ”