Hearing this, several people were dumbfounded.

Fill the paper tube with mud? What the hell!

"Brother Li, what is the principle of this mud?"

Li Siwen came to Li Yanran's side, his eyes full of doubts.

He really couldn't imagine what Li Yanran's operation was to fill the paper tube with mud.

"How can I explain to you, what I'm going to do is called fireworks, which is the kind of thing that Peng blows up fireworks into the sky with a bang and then explodes in the sky."

"Sealing the mud inside is actually giving the fireworks a recoil force, a force to make it fly."

Li Yanran also had nothing to say, and explained the principle of fireworks flying into the sky.

"Anti-recoil force?"

These few people are even more dumbfounded, what is the recoil force?

"What does this recoil mean?"

Cheng Chubi came over, his eyes full of curiosity.

He felt like he might be going to grow his brain again.

"Recoil?"

Li Yanran was also depressed, how could she explain this?

This will open a small science class, and these criticisms must be understood!

"It's actually quite simple, like!"

Li Yanran said and smashed a punch on Cheng Chubi's belly.

"Brother Li? What have you done to me? ”

Although Li Yanran's fist didn't hurt, Cheng Chubi was also confused, and he didn't understand what was going on.

"Did you just see my hand flick back?"

Ignoring Cheng Chubi, Li Yanran just asked the people around her.

Li Siwen also smashed a punch on Cheng Chubi's belly as he spoke, and he instantly understood when he felt the reaction force that Li Yanran said.

“？？？”

Cheng Chubi was stunned, Brother Li hit, I have nothing to say, why do you dare to beat me.

No matter what Li Siwen said, Cheng Chubi also smashed it with one punch.

"Cheng Chubi, what are you crazy about?"

"Li Siwen, Xu you beat me, don't you want me to beat you?"

"Damn, my master is doing experiments, Lao Tzu will fight with you."

Both of them have a small temper, and they scuffle together.

"That's enough, pull them both away for me!"

Looking at the two people in front of her, Li Yanran slapped her forehead.

This special meow is really not kind to me, how can he have such two gods under me.

"Li Siwen, do you understand?"

Looking at the embarrassed Li Siwen, Li Yanran also had high hopes for him.

After all, this is the only one of the four who is slightly more normal.

"Brother Li means that after the black powder explodes, it will impact downward, and then it will be able to fly into the sky with fireworks? Right. ”

Li Siwen wiped the dirt on his face, and after glaring at Cheng Chubi, he also said what he had comprehended.

"That's right, that's what it means, I sealed the door with mud to ensure the tightness of the fireworks, if there is a leak, he can't fly."

Li Yanran nodded, Xiao Zhuge was still smart, and he didn't let himself down.

"Proud of what? Doesn't it depend on our belly? ”

Looking at Li Siwen's small eyes, Cheng Chubi directly revealed a disdainful gaze.

If you don't have our belly, can you figure it out with your brain?

"What so much nonsense, hurry up and get to work."

With a glance at Cheng Chubi, you will have a little bit of use in your stomach, as for your brain, forget it!

"Okay."

A few critics didn't dare to speak, and immediately began to turn up the wet mud and fill it into the paper tube.

"You have to make this dirt solid, smash it, if it doesn't, it will leak."

"Cheng Chubi, what are you doing, what I want is mud, why are you pouring snow into it?"

"Eldest Sun Yan, work hard, haven't you eaten?"

Li Yanran stood in the distance as a supervisor, constantly pointing out several mistakes in criticism.

After all the paper tubes were wet with mud, Li Yanran fell into thinking again.

"Your Highness, there is something I don't know whether to say or not?"

Di Renjie witnessed all the processes, and he also frowned and said.

"What's wrong?"

"Your Highness, I understand the recoil force you just mentioned, but you use dirt to make these thick like this, and when the black powder explodes, how can you determine whether the recoil force is up or down?"

Di Renjie also said what he thought in his heart.

“？？？”

Hearing Di Renjie's words, everyone was stunned.

That's right, you're stocky down there, isn't this the same as the bamboo cannon battle you made, just blow it up?

Li Yanran was also dumbfounded, squatting on the ground and drawing circles.

After thinking about it for a while, she also realized that she might have done something wrong.

The bottom of the two kicks of the special meow seems to be hollow, and the top is sealed with mud.

In the end, he is a smart person, but he is different from those few critics.

"I know what to do, fill the paper tube with gunpowder first."

Li Yanran smiled slightly, just a second kick, and he could still stump himself.

Although everyone was still a little confused, they immediately acted according to Li Yanran's instructions.

Carefully filled the gunpowder into the paper tube, and then stopped.

What's next?

Li Yanran was also stumped, it stands to reason that the lead should be filled now and then sealed with clay, but it seems that there is no lead now!

If you just stuff the paper in it, it will die in the mud, and it will be really depressing.

The top priority is to make the leads.

But what to do with the leads?

Li Yanran squatted on the ground again and began to draw circles.

"Brother Li? What's next? ”

The eldest grandson Yan looked at Li Yanran, who was squatting on the ground and drawing circles, and was also confused.

"How? You first twist a lead out of the paper. ”

"Leads?"

A few people were stunned again, what is a lead?

Why is there so many terms for Brother Li?

"Leads? You twist the paper out for me first. ”

Li Yanran didn't know how to explain it, because she didn't know how to get this thing, so she could only experiment step by step.

"Oh."

Twisting the lead is very simple, and it is OK to roll the paper into a line.

Lighting the lead that had just been rubbed, Li Yanran was also waiting to see the effect.

The paper twist is too solid, which leads to a long time to burn a little.

"This won't work!"

Li Yanran frowned, if she relied on this paper twist as a lead, the fireworks would have landed, and the gunpowder on the second layer would not have exploded.

"Your Highness, do you think this paper twist burns too slowly?"

Di Renjie also frowned beside him and asked Li Yanran what he thought.

"Well, this paper twist burns too slowly, and it is easy to extinguish, is there anything that can be used as a substitute?"

Li Yanran nodded and said what she needed.

"Your Highness, have you ever thought about adding some black powder to this paper twist?"

"That's right!"

Hearing Di Renjie's words, Li Yanran also suddenly realized.

Why didn't you think of it?

Adding gunpowder to the paper twist can not only increase the burning rate, but also ensure that the paper twist will not go out.

In the end, it is a cultural person, but it is different.

"Why are you stunned, why don't you get it quickly?"

Li Yanran glared at Changsun Yan, what are you doing with your little eyes, work!

"Oh!"

Changsun Yan shuddered and hurriedly did what Di Renjie had thought.

Soon the brand new lead was placed in front of several people.

"Who's going to do it?"

Li Yanran frowned, after all, this thing is filled with black powder, in case one of them is not operated well, it explodes, what should I do.

"Brother Li, I'm running slowly, don't count on me for this job."

The eldest grandson Yan was the first to jump out.

Among these people, they are running slowly, and if they blow up, they won't even have a chance to run.

"Me"

Li Siwen's eyes were also panicked, after all, everyone knew the power of this black powder, and he hadn't married a daughter-in-law yet, but he didn't want to die young.

"I'll do it!"

Glancing at everyone, Cheng Chubi also stood up with a pat on his chest.

Now let me show you what a macho man is, isn't it just a lead?

Look at you one by one, I'm scared to death.

"Okay, then I'll leave it to you, and everyone will stand back."

Now that Cheng Chubi has stood up, Li Yanran ran away directly.

The rest of the group were the same, all of them stayed away from the scene.

Looking at the lead in front of him, Cheng Chubi also swallowed his saliva.

This thing is said to be done.

After all, no one is a fool.

"Cheng Chubi, you are a point!"

Changsun Yan looked at Cheng Chubi, who was inactive, from a distance, and shouted directly at him.

"What's nonsense, you talk a lot of nonsense?"

Li Yanran jumped up and gave the eldest grandson Yan a slap, you don't dare to do it, don't talk nonsense there.

Hearing Changsun Yan's words, Cheng Chubi also gritted his teeth and put the fire fold on the lead.

"Sting!"

The lead ignited when it caught fire, and Cheng Chubi also ran away.

But he hadn't run a few steps yet, and the back had already burned out.

“？？？”

Looking at the fuse that had burned out, everyone was stunned.

That's too fast, right?

Several people all came over, looking at the black marks on the ground, they were all at a loss.

The paper twist just now burned too slowly, and now this one is too fast, how can this be done?

"No, we have to improve it!"

Pinching the burning wreckage of the lead, Li Yanran began to draw circles again.

I just want to make a firework, why is this the first step so difficult?

Di Renjie also squatted on the ground, looking at the wreckage in front of him and frowning.

If you don't load the gunpowder, it burns slowly, and if you fill the gunpowder, it burns quickly, so if you don't load it or add it a little, you can solve the problem.

Saying that, Di Renjie also got a piece of paper, pulled it into small strips, and then still in the small jar containing gunpowder.

After stirring for a while, the original white paper had been stained black by black powder.

At a glance, he also used his hands to rub the black paper into a lead.

"Your Highness, try again?"

Looking at the black lead handed by Di Renjie, Li Yanran was also stunned.

What is this operation?

Although she didn't understand what Di Renjie meant, Li Yanran still gave Li Feng a look.

Li Feng also took out the fire fold and lit the lead that Di Renjie was rubbing.

Now that it was confirmed that the lead would not explode, several people also squatted on the ground and watched the lead burn.

"Sting, stinging."

The lead that had just been made also began to burn, and sparks were rising as it burned.

Although the new lead is thinner than the previous one, the combustion rate is much slower.

Until the lead burned out, several people also looked at Li Yanran together.

Is this done?

"This is it!"

(End of chapter)