Even if Zhu Cilang makes a cheat, he has to abide by the basic rules. You can’t do anything just by wanting to do it. You don’t have a system or gold finger. Everything depends on your own knowledge to slowly explore and practice according to the theoretical knowledge you have learned.

When he asked the shopkeepers of the cloth shop what was not breathable, the few people kneeling on the ground looked at each other and no one knew. One of them raised his head and said boldly: "When it comes to Mr. Qiansui, all the fabrics in the world are breathable. If you say that something is the worst breathable, it must be fur."

"Fur," Zhu Cilang nodded: "I never thought that the idea of ​​using cooked cowhide as a balloon is good."

Everyone was confused again, wondering what kind of balloon His Royal Highness the Crown Prince wanted to make, but cowhide was very expensive.

Plowing oxen cannot be killed. Killing oxen has been illegal in all dynasties. In addition to dying of illness and old age, there are not many cowhides. There are also big drums and armor.

At present, making hot air balloon cowhide is the best choice. Just sew dozens of cowhide together, it will be a complete hot air balloon. Moreover, the cowhide made with nitrogen is also very light in weight, making it a suitable material for making hot air balloons.

But there is another point: cowhide is not fire-resistant. Refractory materials must be used, and there is a need to find another way to do this.

"A few of you bricklayers, I ask you if there is a kind of paint that can be flame retardant. For example, if you apply this paint on paper, it will be difficult for the paper to ignite..."

...

Zhu Cilang gathered craftsmen in the city and vendors from all walks of life. The shopkeeper of the Sauce Wine House was responsible for purifying alcohol. These alcohols can be used as the best fuel. The shopkeeper of the cloth shop advised Zhu Cilang to use animal fur. Zhu Cilang finally chose cowhide. The cowhide was strong and durable, and the weight was also within the acceptance range.

The important thing is that even if you fly in the air and the cowhide is shot by a feather arrow, it can still maintain good sealing performance. Even if there is a leak, you can continue to fly.

In addition, several masons recommended a brown-red dye. This dye was used by wealthy families to color the wood and had a flame retardant effect. Zhu Cilang ordered people to remove the cowhide drum in the yamen. After applying this dye to the cowhide, it was difficult to ignite it with fire. This is one of the best materials for making hot air balloons.

Zhu Cixuan’s plan was to first weave the skeletons with bamboo, then apply cowhides on it, and the bamboo sheets were covered with flame-retardant dyes. In this way, the basic prototype of the hot air balloon will be found.

As for hanging baskets, counterweights and so on, it is very simple. Whatever is the lightest, you can use it as a hanging basket. Wicker weaving has always been the product of Chinese civilization and wisdom, so it is not difficult to make a hanging basket. Zhu Cixuan uses sandbags as counterweights. At present, the basic principles and technical thresholds of hot air balloons have been overcome.

The rest is left to time to make. How to make gunpowder is Zhu Cilang's duty.

Sulfur is very simple, and there is no shortage of sulfur in nature. Even many medicine shops have these things. Needless to say, the rest is Glauber's salt.

Glauber's salt also needs to be purified, and this takes a little effort. Zhu Cilang personally prepared the ratio of gunpowder and then made black gunpowder.

但是,即便如此还是出事了.

When frying black gunpowder, although the heat did not control well, it did not cause an explosion. However, a pot of black gunpowder still exploded.

When Zhu Cixuan escaped, his whole body was already smoked into an African chicken. There was no way, so he could only cook it twice. The gunpowder made by Zhu Cixuan was very damaged. The shot put was filled with gunpowder, iron filings, and broken porcelain. There were leads on it. When the hot air balloon flew into the enemy camp, he threw the lead bullets one by one, which was enough for Li Zicheng and the others to drink a pot.

Now, what Zhu Cilang lacks the most is time. It depends on whether Li Yan can hold them back.

五日后,李自成的营帐.

Li Yan apologized for guilt and agreed to come up with a way to defeat Luoshan County within five days. But until now, Li Yan has not come up with any tricks.

Li Zicheng looked at him coldly: "Mr. Li, the five-day deadline has arrived. What about your promise to me?"

Two soldiers stood behind Li Yan, waiting for the King of Breaking to drag Li Yan out to rectify the Dharma at the command of the King of Breaking.

Li Yan pondered for a moment, and then said, "The King of Chuang is not to be hiding. Luoshan County is easy to defend but difficult to attack. The subordinates of Hong Niangzi shared the same hatred of the enemy. It is difficult for us to conquer it in a hurry. I originally thought of a solution, but the King of Chuang may not know that, except for Hong Niangzi's old subordinates, the court of Luoshan County has sent a Hu Ben Army, which is the personal guard of His Highness the Crown Prince, and its combat effectiveness is particularly terrifying. What I mean is that it is not appropriate to send troops at this time."

Li Zicheng suffered from the Hu Ben Army. He set up an ambush in a foggy day. His subordinates were killed and injured, but the other party failed to leave a body. After thinking about it carefully, Li Zicheng and Liu Zongmin were both frightened.

When Li Yan said this, Li Zicheng couldn't help but feel secretly shocked. It turned out to be the Hu Ben Army or the Prince's personal soldier. No wonder he was so powerful.

On the surface, Li Zicheng pretended to be calm: "Oh, how many of them are there in the little prince's Hu Ben Army?"

“大概,不下三千人.”李岩回道.

Li Yan didn't dare to say much, and Li Zicheng also knew that such a terrifying army could not have too many people. This is probably an elite army selected by the little prince. When Li Yan said three thousand people, Li Zicheng was still shocked.

If there were 3,000 people who went to Luoshan County, it would be difficult for them to conquer. In fact, the Hu Ben Army in Luoshan County was only 50.

Liu Zongmin shouted angrily: "Li Yan has issued a military order, the King of Rebellion. The five-day deadline has come. Let me cut off Li Yan's sacrifice flag!"

Li Zicheng had a sneer on his lips: "Mr. Li, do you have anything else to say?"

Li Yan shook his head: "No, I was thinking of tricking Ling Susu, the subordinate of Hongniangzi, out of the city, and then breaking into the king's army. But who knew that there was an additional Hu Ben Army in Luoshan County at this time, and the subordinates were really powerless. Li Yan was willing to be punished."

Li Zicheng was not polite and waved his hand to his heel: "Where is the sword and axe master? Come on, drag Li Yan out of the tent and behead him!"

The subordinates grabbed Li Yan's left and right arms, and Li Yan did not struggle at all to resist. It was his fault, but the five-day deadline had arrived, and he was seeking death if he failed to fulfill his promise. Now, it is reasonable for Li Zicheng to kill him.

Li Zicheng and Liu Zongmin looked at each other, and two soldiers under him escorted Li Yan outside the tent. The sun shone outside the tent, and the sergeant held Li Yan down, and another swordsman behind him raised the big sword in his hand.

Li Yan lowered his head and looked at the shadow on the ground. The long knife in the knife and axe hand fell down from his neck...
Chapter completed!