"This is easy to handle. The imperial court can search for it all over the country. Your Majesty will definitely agree. With the large Kongming Lantern, I have more confidence in the war against the Turks." Li Jing said.

Li Feng continued: "There is still fuel, which can be replaced by oil, but my mentor's gasoline has been used up by me, and now I can only look for oil. Fortunately, my mentor left me a map to know where the oil is.

"

"Great, I'll send people to dig out where it is right away," Li Jing said.

Li Feng said: "Don't be anxious. Digging out the oil without preparing the tools will be very wasteful, and the oil will ignite when exposed to fire, and there may even be a big explosion."

In addition, oil cannot be used directly and needs to be refined, which takes some time. The refined oil needs to be stored in large iron barrels, etc.

I will wait until I feel the time is right to do all this. I feel it is a bit wasteful to develop oil now."

Li Jing said: "Isn't there anything else that can be used? Can't kerosene work?"

"It's not that it can't be used. It can be used, but it needs to be refined and pure before it can be used." Li Feng said.

"As long as it can be used, how you want to refine it is your business. I don't care. I want a large Kongming Lantern." Li Jing said very excitedly.

"I said, Lao Li, why are you so excited?" Li Feng felt confused.

Others also leaned against Li Jing in shock.

Li Yuan said unhappily: "Li Jing, what are you thinking? I proposed this method, but you actually asked Li Feng to build it."

Fang Xuanling said: "Old man, please stop making fun of us. Who suggested this? Don't we know?"

Li Feng scratched his head shyly.

Li Yuan snorted coldly and said: "Hmph, kid, don't be so arrogant. Even if it was your kid who suggested it, if it weren't for me, would you tell me about it?"

Li Feng shook his head and said: "No."

"Look, this kid can't speak at all. It's all thanks to me." Li Yuan said very proudly.

Looking at everyone's eyes, they seemed to be looking at a group of fools.

Li Jing and others completely ignored Li Yuan's eyes, but looked at Li Feng in confusion.

Li Feng was embarrassed and said: "You don't have to look at me like that. The large Kongming Lantern is called a hot air balloon by my mentor. The blueprint has been drawn. Although it has a wide range of uses, it is also easy for others to steal it.

It is even prone to life-threatening accidents, and you may not be able to find you for the rest of your life after flying into the sky.

Another reason is the materials. Making the materials is very troublesome, and my mentor has not found them, so it is still unknown whether it can be completed."

Li Feng still knew something about hot air balloons, so he planned to use his own strength instead of using the system, so that he could earn high achievement points.

Nowadays, a lot of money is spent on the layout of the Military Academy and some experimental materials, such as experimental items, astronomical telescopes, etc.

Fortunately, many ideas in the academy allowed him to earn a lot of achievement points. Generally speaking, it was still profitable.

Now he has 250,000 achievement points, but there is still a big gap between him and 1 million achievement points.

Fang Xuanling walked up to Li Feng and said: "Li Feng, this large... no, the hot air balloon is a powerful weapon. It is perfect for detecting enemy troops."

Li Yuan said: "This guy is much more familiar with the application of hot air balloons than you. It is the easiest to detect the enemy's situation.

This guy also said that as long as you put gunpowder on a hot-air balloon, you just need to fly the hot-air balloon over the enemy's head, and then drop the gunpowder. Just imagine what this scene will look like?

Also, as long as you lock on to the enemy general and use a musket, you can shoot the enemy directly. If the musket fails, you can find an archer and kill the enemy with one shot."

"The old man is absolutely right. This hot air balloon is really a killer weapon. We can conquer the world almost without spending a single soldier.

Li Feng, this hot air balloon must be successfully developed no matter what. Madam, please give him some advice." Li Jing said.

Fang Xuanling also said: "This matter is of great importance. Li Feng, you must successfully develop it as soon as possible. In addition, give a copy of the drawings to the imperial court, and the imperial court will study it with you."

Queen Changsun said at this time: "Li Feng, this matter is related to the Tang Dynasty. I also hope that you can successfully study it as soon as possible. If you have any difficulties, you can come to us."

"Okay, okay." Li Feng finally nodded.

Hou Junji said at this time: "Madam, since Li Feng is willing to help the court make a hot air balloon, we must set a time to prevent the court from waiting all the time."

Cui Mingan said: "It makes sense. It's better to limit it to two months. After two months, the court may not have time to pay attention to the hot air balloon."

Everyone knew that there might be a locust plague in two months.

Li Feng nodded and said: "In two months, as long as we make the burner, there is no need to worry about anything else.

The burner is used to ignite the fire, but the flame cannot be extinguished by the wind, but it can be adjusted in size at any time."

"This is a bit difficult." Du Ruhui said.

Li Feng nodded and said: "It is indeed difficult. If I hadn't solved this and the burner, I would have built a hot air balloon by now."

"Oh, that is to say, you can actually make a hot air balloon now, and you even have the fabric?" Fang Xuanling said.

Li Feng shook his head and said: "No, but this fabric is easy to find. There are so many fabrics in the world, I only need airtight fabrics.

A hot air balloon consists of three parts: a balloon, a hanging basket and a heating device. The balloon is airtight. Once breathable, the hot air balloon will be destroyed, so the fabric needs to be heat-resistant and tough.

But there are so many fabrics in the world, it shouldn’t be difficult to find this kind of fabric.

Hanging baskets are even simpler, just find any weaver to weave a hanging basket.

The most troublesome thing is the heating device, that is, the combustion device. I have never thought about how to solve it. Now that it is fine, the court can help me solve it, so I will take care of other things.

I can finish everything about the hot air balloon in just one month."

"Okay, then we will give you one month." Cui Minqian said.

Queen Changsun said: "Now that everyone has decided. Li Feng, I hope to see the hot air balloon in a month."

"Hey, what are you talking about?" Li Er suddenly came back.

Everyone immediately said: "I have seen the master."

"No need to be polite."

"Thank you, Your Majesty." Everyone thanked them.

Li Er asked again: "Everyone, what were you talking about just now?"

The eldest grandson walked up to Li Er, took his arm and said, "We were talking about the Kongming Lantern just now. Second brother should know about the Kongming Lantern, right?"

"Of course I know, my life has been saved by a Kongming Lantern," Li Er said.
Chapter completed!