After the long-term memory was touched, Ren Yan felt a lot of emotion in his heart.

But then, he still focused his eyes on Xu Kai's drawing again:

"In fact, this sail does not only have the advantages that Xu Kai just said."

"In addition to the wind coming from all directions and the stable speed, it also has the advantage of safety."

"This kind of construction similar to the shutter also saves the fact that it is difficult for a traditional sail to raise and lower the sail every time."

"As long as we have the ropes attached to this sail, so that each rope can control a small area, and then converge on the main rope, its lifting can be done by pulling the rope."

"The principle is almost similar to that of the blinds, and we don't have to climb or descend anymore."

"And in terms of the number of people, it can also be greatly reduced, even if it is a mainsail, with two people operating it, it should be able to cope with all situations."

"So, when we put on this set of sails, there should be no more situations like the previous situation where more than 20 people controlled the sails."

After that, Ren Yan glanced at Xu Kai deeply, his eyes full of appreciation.

And as his words fell, Wang Bo and the others were completely petrified, and after opening their mouths for a long time, they finally collapsed with only one sentence of 'national quintessence'

"Damn..."

Only Wang Yu, looking at the sails on Xu Kai's drawings, his eyes gradually narrowed, and he started his own brainstorming again.

After a while, he also sighed a little prostration, his eyes were full of admiration, but his tone gradually became nine-class:

"This Nima can be, Xu Kai's grandson's brain is so long..."

And Xu Kai didn't care about all this at all, after Ren Yan said this, he immediately slapped his thigh and stood up excitedly:

"Teacher Ren, you understand me!"

"Look at my classmates, they think I'm in the Arabian Nights!"

"Help me make sails, also out of a kind of fun mentality, I still have to beg them~"

After that, Xu Kai glanced at the ninth class students with a few traces of complaint in his eyes.

Seeing this, Ren Yan nodded seriously and gave a solution:

"It's just, they're going too far."

"In that case, why don't you make the sail and slap them in the face?!"

"And if they want to use it later, you can even charge them!"

As soon as these words came out, Xu Kai's eyes lit up, and the students of Class 9 on the side immediately glared at Ren Yan:

"Teacher Ren, you are blatantly splitting!"

"Our Class Nine is a unit, how can you say such a thing?!"

"That's it!"

"It's also charged, is this worthy of the friendship of our classmates~"

Here, a group of classmates complained, but Ren Yan was still unmoved, smiling and not responding.

And Wang Yu quietly added: "You are probably too worried." ”

"Teacher Ren's words are obviously hilarious."

"Since Xu Kai has already done it, he will definitely be on the ninth class, can he really not let us use it?"

"Unless Xu Kai doesn't plan to install it on the ninth class."

As soon as these words came out, everyone in Class Nine was dumbfounded, and they glanced at Ren Yan in unison again:

"Cheap teacher, I've never been a person!"

At this time, Xu Kai replied with compassion: "Hmph~ Even if you on the ninth class are free to use." ”

"But in other respects, I can still keep you from using it."

Hearing this, everyone in Class 9 laughed, trying to keep restraint and not laughing out loud.

Just kidding, we can still use this kind of thing in other places except on Class 9?

However, in order to make up for Xu Kai's perfunctory behavior just now, everyone in Class Nine still chose to admit it:

"Yes, yes, the elder is right~"

"And now, the little ones will help you make this sail?"

"Don't worry, we're absolutely on our minds this time!"

"Hmph, this is almost the same~" Xu Kai nodded proudly, and began to arrange the work of making sails again.

On the side, Zhang Ting also came to Ren Yan's side, smiling and watching everyone in Class 9 busy.

Class 9 has such a cheerful but absolutely not annoying atmosphere, she really likes it so much.

This time, with the full assistance of everyone in Class 9, Xu Kai's sail was quickly made.

The difficulty of making this set of sails is not high, it can even be said to be very low.

At the very least, it's a few dimensions lower than an ordinary triangular sail.

It doesn't have to take into account the magnitude of the wind, the direction of the wind, or the effect of the rope on the sail force.

What is needed is to reproduce the sail according to Xu Kai's design drawing.

This pair of Class 9, who have already rubbed a variety of things by hand, would have been a piece of cake, if it weren't for the perfunctory emotions they had been working with before.

This little thing, they can do it with their eyes closed.

Fortunately, this attitude has dissipated in the in-depth understanding just now.

As a result, the new sail system appeared in front of everyone's eyes in ten minutes.

Looking at the sails, which were like shutters and looked extremely weak, everyone inevitably fell into doubt.

"Can this thing really be as reliable as Xu Kai and Teacher Ren said?"

Some students picked up this set of sails with both hands and hesitated.

The others also had a slight suspicion in their eyes.

"Hey, it's okay, can't you just try it?" Li Cheng waved his hand indifferently: "No matter how much you think about it, it is better to practice it once to be effective." ”

"And this is the first time that we don't need to change the sail of the ninth class, anyway, we don't have a big thing to do now, just take out a lifeboat from the bottom compartment and install it to see the effect."

"It just so happens that the sky is bright now, and the waves are not shocked."

"Makes sense." Hearing this, everyone nodded, then looked at Qingdong, and then shook their heads:

"No, this job can't be called Qingdong, this cargo's boating skills are the best in our class, and it may not be effective."

"We have to find someone who can't do much in boat~"

Afterwards, everyone looked at Zheng Chen.

As the only guy in Class 9 who still looks a little clumsy in boating, this is already the best choice.

Seeing this, Zheng Chen was stunned at first, and then the whole person became sad and angry:

"What do you mean by looking at you?"

"Am I as unbearable as you say?!"

"You apologize to me!

”

When the words fell, everyone laughed and said nothing, looking at each other fixedly, with only one meaning, "What do you say~~~"

Seeing everyone's expressions, Zheng Chen immediately wanted to refute it, but after thinking about it, he still scratched his head a little embarrassed.

It seems that compared to them, I am really a bit of a dish in the boat.

But...

Will the dish make him listen to his classmates?

Naturally, you can't~

He's got other things to do now!

Thoughts flashed, and Zheng Chen said calmly: "Although theoretically, this matter is up to me." ”

"But I can't go right now."

"Such a good opportunity, I have to draw such a scene."

"Draw it?" Everyone was stunned.

Zheng Chen nodded affirmatively: "Nonsense!" ”

"I didn't draw yesterday's thunderstorm, and I regret it now."

"This is such a good opportunity, if you don't let me paint it, my soul as an artist will not promise me~"

"I don't think you're going to let me be whipped by my soul~"

"Huh~~" Hearing this, everyone glanced at Zheng Chen, but their eyes still moved away from him.

In terms of giving full play to their respective talents, the people of Class 9 have an unwritten rule, that is, they must not interfere with each other, and they must help when necessary.

Otherwise, how could they give full play to their respective talents in Class 9.

Can... If Zheng Chen doesn't go, who should go to Class 9?

Except for the two extremes of Zheng Chen and Qingdong, the skills of the others in Class 9 are all half a catty.

Maybe the final result won't be very intuitive?

Just as everyone was thinking about the candidates, a female voice came out: "Or, let me try?" ”

As the words fell, Xia Yue walked up with a smile.

"You?" After seeing that it was Xia Yue, everyone in Class Nine was obviously stunned for a moment.

In terms of candidates, they really didn't subconsciously take into account girls.

It's not that they don't think girls are good, but in this kind of physical work, they have always adhered to the most basic demeanor.

Unless there is something urgent, this kind of work is all their boys rushing to the front line.

Now that Xia Yue took the initiative to come out, they were a little uncomfortable.

"Is there anything that doesn't work?" Xia Yue smiled: "Anyway, the main purpose of our test this time is to see the specific effect of the sails. ”

"Although I am better than Zheng Chen in the boat, I am not much stronger."

"On the contrary, in terms of strength, I have to be smaller."

"Didn't Teacher Ren also say that this sail is not only easy to control, but also very labor-saving."

"Now it's up to me to test it as a girl, don't you think it's right?"

As soon as this set of rhetoric came out, everyone in Class 9 agreed after a short period of entanglement.

Xia Yue's words make sense.

And after her analysis, this set of sails seems to be tailor-made for a little girl like Xia Yue~

Indeed the most suitable person.

After everyone in Class 9, including Ren Yan, agreed, the new set of sails was quickly installed on a lifeboat.

Later, after Xu Kai explained some details of the operation to Xia Yue, Xia Yue gave a thumbs up, went to the bottom warehouse, and drove the rescue boat to the ocean.

At the moment when Xia Yue came out of the warehouse, the eyes of everyone in Class 9 were all focused on Xia Yue's body.

Only Wang Bo silently put on a set of life jackets, and his fists were secretly clenched with some nervousness.

On the side, Li Cheng glanced at Wang Bo curiously: "What do you mean by dressing up..."

"Nonsense, if something goes wrong with this sail, I can't go to the rescue immediately?" Wang Bo glanced at Li Cheng angrily.

Li Cheng opened his mouth and said dumbly: "Young, you have switched to the mode of spoiling your wife and crazy demon now, no wonder this style of painting~"

The corners of Wang Bo's mouth twitched, and he glanced at Li Cheng:

"Fuck off!"

......

And at this time, above the sea.

Xia Yue drove the rescue boat to open the sails made by Xu Kaixin.

Because this is to test the new sails, Xia Yue's rescue boat is not equipped with rubber oars, and all the power of the boat will come from the sails' perception of the wind.

Of course, for the sake of safety, Xia Yue's lifeboat will not float too far, and will only surround the ninth class for testing.

But even so, in fact, the moment she suddenly came to the sea, Xia Yue's heart was still slightly timid.

As the representative of the girls on the ninth class, Xia Yue dared to swear that this was really the first time she sailed alone in a rescue boat in the deep sea.

Even if it was sailing training before, the people of Class 9 only completed it in the shallow sea.

Although there will be some risks, it is a small amount compared to the current situation.

Seeing that the deep seabed was so close to her, Xia Yue's heart couldn't help but become a little nervous, for fear that she would make a mistake in operation or Xu Kai's design.

But the moment she unfurled the sails, Xia Yue's heart stabilized.

As my teacher said before, the operation of this sail will hardly feel any difficulty, just a slight pull of the rope, the sail is like hearing a command, and it is very cooperative to complete all the stretches.

After stretching, a slight force acted on the sails, so that the rescue boat, which was originally in a stagnant state, immediately had the momentum to move forward.

Even though the wind is now very weak, almost negligible, the momentum is still visible to everyone.

Seeing that the rescue boat began to move slowly, the eyes of everyone on the Ninth Class gradually widened:

"Oh my God, in this almost windless environment, it actually moved?!"

"Can this sail really sense such a faint wind?"

Everyone stared at Xia Yue's lifeboat and began to look forward to the performance behind the sails.

And the moment Xia Yue felt the wind, her mind began to recall Xu Kai's teaching just now.

'Feel the direction of the wind so that the side of the sail touches the wind. ’

Only in this way can you ensure the direction of the ship, and if the whole sail is affected by the wind, then you will definitely move in the direction of the wind, so that the sail will have no meaning. ’

And you don't need to push too side contact, as long as you have a slight deflection angle, it can help you steer. ’

'Don't worry, it's easier to deflect the sail than to lift it, just pull the rope in your hand in the opposite direction...'

Thinking back to Xu Kai's teaching, Xia Yue slowly closed her eyes and began to mumble to herself.

"Feel the direction of the wind, Natsuki."

"Don't panic, you can do it."

After feeling a slight gust of wind, Xia Yue reopened her eyes, her arms tugged lightly, and the new sails immediately returned like a high-quality lover.

It's almost like a slight deflection of oneself between breaths.

The original direction of the wind immediately swept along the deflected sail, giving the sail a completely opposite force.

For the first time, the lifeboat was under the control of Xia Yue, and completed an ideal turn.

'Actually... Did it really work? ’

And the strength of the sail is so gentle that even if your arm is wrapped around the rope, you won't feel any pulling. ’

With this thing, it seems like sailing alone is really not a difficult thing anymore. ’

Xia Yue was happy in her heart, and her eyes couldn't help but look up.

At this time, the sails have already shown their abilities under the influence of the breeze.

But Xia Yue inexplicably felt that even in terms of speed, she might be able to control it.

With a blind-like design, does it only take a few louvers to raise to complete the speed control?

With this in mind, Xia Yue tugged on another rope, which was used to put away the sails.

After a few tugging, the sail was retracted by a third.

The lifeboat, which was moving at a constant speed, slowed down a few points.

It's like a tourist strolling in the sea, taking the summer moon to appreciate the scenery of the ocean.

"It's really possible~'

At this moment, Xia Yue's original worries had dissipated without a trace, and what remained was a strong sense of curiosity.

With this curiosity, Xia Yue began to pull the rope frequently, and the jerky at the beginning quickly became proficient.

It didn't take long for the lifeboat to circle around the ninth class.

The feeling of convenience and speed was immediately imprinted in everyone's hearts.

It can be regarded as a more intuitive understanding of the practicability of this new sail.

So much so that the eyes they looked at Xu Kai changed.

This thing, it's really a fucking talent~

And this research and development is still because of the thunderstorm, so if something else happens, what can this product make?

Everyone in Class 9 couldn't help but have this thought.

As for Xu Kai, his expression gradually changed from apprehension at the beginning to arrogance.

Hmph, let's just say, our design is still very good~

On the ship, everyone in the ninth class had different thoughts.

And Xia Yue seemed to be addicted to playing here, and began to drive the rescue boat around the ninth class round and round.

Even when she turned to the third lap, she sang happily, and her mood was obviously good.

Theoretically, Xia Yue only needs to complete the first voyage to complete the mission.

But in the end, in her happy mood and singing, Xia Yue still circled around the ninth class five times before returning to the ninth class in Wang Bo's shouting.

In total, it took half an hour, which is already a very fast speed.

After Xia Yue returned to the deck, the people of Class 9 couldn't wait to surround her and ask her what she thought of using the new sail.

Xia Yue smiled happily:

"It was great, I felt the joy of driving a boat for the first time."

"And it really doesn't have any struggles, and the sails are easy to handle."

"And its handling is much simpler than that of an ordinary sail, as long as you are familiar with it for about ten minutes, you can do it like an arm."

"Even someone like me, who isn't good at navigating boats, can get started right away."

As soon as these words came out, everyone in Class 9 immediately applauded Xu Kai, and praised without hesitation: "Big boss!" ”

Xu Kai pressed his hand lightly, and said quite modestly: "Little meaning, small meaning." ”

But as he said, anyone could see the pride in Xu Kai's eyes.

Only Zheng Chen was alone, holding the painted picture scroll and speaking weakly: "That..."

"If I go down to test lap now, you will formally apologize to me and admit my sailing level, isn't it a big problem..."

When the words fell, everyone in Class 9 looked at him with a smile and didn't say a word.

In the end, Wang Bo patted him lightly on the shoulder: "Alas~Chen'er, it's late~"

"Although we would also like to apologize to you..."

"But if you are given a chance, you will not be useful~"

Hearing this, Zheng Chen's face fell: "Damn! ”

"If I had known, I wouldn't have shirked it!"

"I can't take off my hat as a weak chicken!"

Immediately, he handed his picture scroll to Xia Yue: "I've sent you." ”

"This is the way you sailed, and it should be a good experience."

Xia Yue nodded and took the scroll.

On the scroll, there is a brush painting in the style of ink and wash, and the originally vast sea has a bit of indescribable poetry in Zheng Chen's depiction.

In the volume, Xia Yue dragged the rope with her right hand, her eyes looked softly into the distance, her lips opened lightly, and her left hand was properly placed in front of her, as if she was singing a beautiful song.

Under the combination of these two, there is an indescribable artistic conception, which gives Xia Yue a very wonderful feeling.

It felt as if Xia Yue was back on the lifeboat just now.

So much so that Xia Yue felt a little that Zheng Chen had really seen what he felt in his heart just now.

But in any case, Xia Yue liked this painting very much.

He smiled at Zheng Chen, thanked him, and put away the painting beautifully.

It was a really perfect start for her this morning.

After Xia Yue put away the painting and the sail test was completed, Ren Yan clapped his hands and mentioned a new question:

"Okay, then we've done what needs to be done now, and the new sail has been verified for its viability."

"Shouldn't that give this sail a new name?"

After that, Ren Yan looked at Xu Kai, and everyone in Class Nine also stared at him in unison when he heard the words.

Xu Kai was stunned at first, and then carefully began to think about himself.

Finally, after combining his thoughts last night, he was glad that he was born in the Dragon Kingdom.

If he hadn't been born in the Dragon Kingdom, he wouldn't have experienced those ideas at all.

Yes, after a moment of thought, Xu Kai gave a name similar to Ren Yan's previous life Zhonghuafan.

"Then let's call it Long Guofan!"

......

"Yes, that's a good name."

"It has to be our Dragon Kingdom, without a few years of Taoist cultivation, who can appreciate this kind of mystery and the mystery of being in the world?"

"It's perfect for this sail."

In the live broadcast room, after Xu Kai named this sail, Longguo netizens immediately agreed and gave a very high evaluation.

That feeling of honor can be felt even through the screen.

However, compared with the netizens of the Dragon Kingdom, some foreign netizens feel that their worldview has been impacted.

At this time, the language translation function of the program group has been launched, and they naturally understand what the netizens of Longguo are saying.

Originally, at first, they simply thought that this sail was a black technology.

Although it may not seem to be very technical, there is an amazing wisdom behind it.

But as soon as the netizens of the Dragon Kingdom spoke, they were messy.

What is Daoist thinking?

What do you mean by four or two thousand pounds?!

Why is it that there is already a translator, but we still can't understand what these dragon people are saying?!

Does this set of technology contain some mystery that the Dragon Kingdom can't speak directly?!

Eventually, in a series of 'brain-racking' brainstorming.

These foreign netizens unified their voices and issued a burst of emotion from the soul:

"That place in the Dragon Country, it really doesn't belong to Newton~"

It's just that in this emotion, there are still a number of foreign high school students who don't know what happened in Class 9 above the Arctic Ocean at this time.

Because now they are busy contacting major universities, and they want to show them a big one when Class 9 arrives in Europe!