Even if Qin Ze roughly knew the initial aircraft structure, he didn't have enough strength of steel and engines. With Datang's current technology, it is absolutely impossible to make airplanes and the like.

But if you want to fly into the sky, there are other simple ways, such as hot air balloons, which do not require high technology. And Qin Ze also remembered that oil as fuel was written into the Book of the Later Han Dynasty by Ban Gu as early as the Eastern Han Dynasty.

It's just that nowadays this thing is called fire oil, and because there is no refining technology, it will produce a lot of black smoke when burned, so people agree that this thing is poisonous, and no one has used this thing for a long time.

Although it was not refined, it was still more than enough fuel for the hot air balloon, and Qin Ze originally planned to buy it from those Turks who were doing business in the Tang Dynasty, but now that Li Er called him, he didn't have to pay for it himself.

Therefore, as soon as Li Er asked this, Qin Ze began to explain to him.

"Your Majesty, the kid does have an idea, but he still needs His Majesty's help."

The key to making a hot air balloon is not fuel, but how to make the hot air balloon strong and closed. Ordinary cloth is impossible, and at this time, in addition to these things, the only thing that can be used is the skin of various animals. This is the only thing that can be done without air leakage.

When Li Er heard Qin Ze say this, he was also interested, and asked, "Is there any way?" ”

In his opinion, Qin Ze has a lot of ideas, and there is really no way to do it.

"Then doesn't the Cui family just want to fly up below? The boy will fly one for them. ”

Qin Ze's words were light and light, but Li Er's face twitched when he heard it. He never thought that Qin Ze's method was really to fly up.

Is it possible for a person to fly? How can a man fly without wings? Jumping up on two legs?

Glancing at Qin Ze again, he found that the other party's face was full of confidence, and at that moment, Li Er also frowned, and directly knocked on the case and said coldly: "It's light? You think that thing can fly if you want to? ”

Having said this, Li Er was stunned, because he suddenly remembered that Qin Ze was different from them. This kid has been enlightened by immortals, and he is also half a little immortal. Could it be that you can really fly?

Thinking of this, Li Er also felt a little expectant and asked, "But that immortal taught you the art of flying?" ”

Hearing this, Qin Ze couldn't help but sigh, the existence of immortals has a fatal temptation for every generation of kings, even Li Er is not immune. Qin Ze didn't know what Li Er was thinking in his heart, and it was clear that the other party was not giving up on the matter of immortality.

The matter of immortality is poison for Li Er, and it is a spiritual poison that will slowly corrode him.

Qin Zeyou sighed in his heart, but said without the slightest expression on his face: "Where can the kid fly, don't talk about the kid." At that time, the white-bearded old man was also walking on the ground with his feet, and I am afraid that he was just a mortal......"

"That's it, that's it, tell me how you can fly." Qin Ze wanted to explain again, but was interrupted by Li Er. Li Er couldn't hear what Qin Ze meant, and knew that this kid was afraid that he would be bewitched by immortality again. At the moment, he didn't want to mess with Qin Zehu, so he took the initiative to end this problem.

Seeing Li Er's appearance, Qin Ze also knew that if he continued to play tricks, he would definitely find a reason to beat a few boards. immediately replied honestly: "Your Majesty, the boy is going to make a hot air balloon and fly up the Luyue Tower." ”

"What ball?" Li Er was stunned, and his heart was also a chuckle. He suddenly had a bad thought, feeling that he was asking for his own hardship.

"Actually, it's similar to a kite, except that the hot air balloon uses air buoyancy and the principle of low density of hot air to make the balloon fly into the ......sky," Qin Ze gushed out, and even used his own handkerchief to demonstrate in order to make Li Er understand more vividly.

In this way, Qin Ze spoke for half an hour, during which Li Er had been sitting upright, although his face was also thoughtful.

But in fact......

I don't understand a word.

What air buoyancy? What density? What wind?

I only heard that Li Er's head hurt again, but he couldn't show his ignorance. I can only pretend to understand, and I will ask a question or two in between. It's just that I'm already complaining in my heart, and I regret why I asked about this hot air balloon.

How could Qin Ze not know what Li Er didn't understand, if Li Er could understand things like air buoyancy, then Qin Ze would have to wonder if he was also a traverser.

But it doesn't matter if Li Er doesn't understand, Qin Ze just has a good time. There are not many opportunities like this, Li Er bullies himself on weekdays, this time with this opportunity, Qin Ze will not make good use of it.

It wasn't until Qin Ze felt much more comfortable in his heart that he stopped. Looking at Li Er's face again, he was almost unable to hold it anymore, and Qin Ze could even see the slight twitching of the corners of his mouth.

"This is the kid's idea, I don't know what His Majesty thinks?" At the end, Qin Ze bowed and asked Li Er.

What else can Li Er think? He didn't understand a word, what could he think. I could only nod and say: "This method is also feasible, but I don't know if this hot air balloon is simple?" ”

There's no way, don't take the topic away. The ghost knows how long Qin Ze will tell him again, this kind of thing that he doesn't know how to pretend to understand, he doesn't want to experience it again.

"This thing is also simple, but it is a little difficult to rely on the strength of the kid alone, and he still needs the help of His Majesty."

Hot air balloons are really a bit troublesome to make. Not to mention anything else, a lot of cowhide and sheepskin are needed, and for Qin Ze, a poor man, he can't afford it at all.

And to sew the cowhide until it is impermeable, I am afraid that only the palm seams in this palace have this ability. Moreover, although the principle of the hot air balloon is simple, Qin Ze only knows a rough idea. Even those professional hot air balloons in later generations have accidents, let alone him who is a half-ass.

I wanted to ask for help from the system, but when I thought of my pitiful wish, Qin Ze endured it stubbornly.

Li Er also wanted to send him away, so he gave him a handwritten metaphor and asked him to go and find someone by himself.

With Li Er's help, Qin Ze made it much simpler, and first found a few famous palm seams and asked them to sew hot air balloons. Then he went to the blacksmith and asked them to help him tie some fasteners. As for the ball warehouse used to sit on people, Qin Ze planned to use bamboo strips to weave.

This is also to minimize the load of the hot air balloon, if it is made of wood or iron, although it is resistant to falling, it also adds too much load. With this unrefined oil, it is difficult to guarantee enough power.

And here Qin Ze is still busy with the hot air balloon matter, and over there, Wei Zheng, Du Ruhui, and Fang Xuanling have already found Li Er.

The reason why they came was very simple, they didn't want Li Er to continue. Of course, this is not because they have a relationship with the Cui family, but because they feel that Li Er is too reckless in this matter.

Wei Zheng, the counselor, was the first to speak, he has always spoken more straightforwardly, and his temperament is relatively upright, so he can be said to be a real counselor.

"The minister heard the rumors in the market today that Qin Ze joined the army and made a bet with the Cui family, so he was not very panicked. Now that the family is powerful, it really shouldn't get involved. Your Majesty thinks twice, and you should be patient. Wei Zheng made it very clear in his words that he wanted Li Er not to meddle in this matter again. Break off the relationship with Qin Ze and win over the Cui family again, this matter will pass like this, and there is no need to go against the Cui family at this time.

Fang Xuanling, the middle book on the other side, also stood up and said: "This Luyue Tower is ten zhang high, how can ordinary people fly on it." Your Majesty is still thinking twice. ”

Speaking of which, it was because they didn't believe that Qin Ze would really be able to fly up. is also afraid that Li Er's rash action will only fuel the arrogance of the family once he fails.

Li Er didn't understand what they meant, if it weren't for Qin Ze's words just now, he was afraid that he would really consider their suggestions. Now there are rumors that this bet is really a confrontation between Li Er and the Cui family, and if it fails in the end, the consequences will be unimaginable.

And if you want to avoid this consequence, you only need to dissociate yourself from Qin Ze now and tell the people that this matter is not what they thought at all. It's just a grudge between Qin Ze and Cui Ling.

Although this was a disguised submission to the Cui family and admitted that he had lost, he managed to keep his reputation in front of the people.

But Li Er has never been a person who cowers, he will not wait until he is 100% sure of doing things, even if it is only four layers, he is willing to try.

"Aiqing means to let me bow to the Cui family?" Li Er's tone was not good, and his face became ugly.

"The affairs of Your Majesty's family should be considered in the long run." Du Ruyan is decisive, and that's what he suggests.

Hearing their words, Li Er suddenly laughed. It's just that anyone can hear the loneliness in his smile, as a generation of kings. was supposed to soar into the sky, but was bound by the family.

But this Tang Dynasty can open him Li Er, but he can't do without these families.

"If I tell you, then Qin Ze can really fly up?"

"What!"

Wei Zheng and the others were all stunned, and they all glanced at each other, not understanding what Li Er meant.

Li Er laughed out loud when he saw the three of them like this, but this time his laughter was full of domineering and arrogance.

So the hot air balloon has successfully become a problem for Wei Zheng and several people. Because they also found ......

I don't understand.

Li Er took in their expressions, and the depression he had just received from Qin Ze was all transferred to Wei Zheng and the others.

After saying this, the three of them were also stunned. You look at me, I look at you, but in the end you can't say a word.

In the end, it was Wei Zheng who was the first to speak, saying, "Your Majesty thinks this method is feasible? ”

"Whether it works or not, we'll see you in three days." Li Er replied very domineeringly, so that the three of them looked at each other, and knew that it was useless to persuade them any longer, so they could only retire one by one.