In the palace, Li Longji, who was waiting to get off work, was listening to Guo Ziyi's report.

"People appeared one after another, all flying in the sky, and then Li Dongzhu flew over and fought with those people......"

Guo Ziyi told what she saw and heard.

Li Longji's eyes widened and he listened, is there something that can find Yulin Feiqi at night? Can Li Yi fly in the sky?

Wang Xing: They always dig other people's graves and send them to Li Yi for treatment?

That child is actually the eldest great-grandson of the Xu family?

"Okay, I'll ask right away." Li Longji didn't want to wait, so he left now and didn't look for a woman.

"Your Majesty, there is also a hot air balloon, which said it will come out in three days." Guo Ziyi reminded.

"There is no need to worry about this, Li Yi said that if he can do it, he will definitely do it." Li Longji threw down a sentence and left.

Li Longji went to the place and found Li Yi in the workshop.

Li Yi stood in front of a large blackboard and explained to the craftsmen the principle and structural layout of the hot air balloon, as well as the materials needed.

"There needs to be a stand here, otherwise the cloth will burn when you light the fire.

The balance of the basket is the most important, and a pendant can be added underneath.

Put sandbags in the basket, and you need small sandbags to adjust the balance when you reach the edge of the basket.

The basket can't be made of metal, unless we develop a good alloy in the future.

Alcohol blowtorch, sealing is the key, press the air in, drive the alcohol to spray out and burn......"

The craftsmen listened attentively while pondering how to manufacture and where it was most difficult.

Li Longji stood at the door and listened together, and he could understand a small part, but as for how to make it, it was not up to him.

Listening to the smile on the corner of his mouth, he found that with Li Yi here, many technical problems were not a problem.

It seems that as long as Li Yi wants to make something, he will definitely make it.

This hot air balloon is a good thing that can take people to the sky, and it is a function to see things on the ground in the sky and appreciate them.

The most important role is war, and when conditions permit, there will be building cars for people to go up to observe the surrounding enemy situation.

The building car is too large, and many terrains are not suitable for transportation, even if it is disassembled and then assembled.

Looking at the appearance of a hot air balloon, it is a big bag, and when it is opened, it becomes a big ball when it is lit on fire.

If this thing flies up a few miles and so high, wouldn't it be the same as standing on a mountain and watching the enemy?

Li Yi continued to explain.

"Rope, rope can no longer use thick hemp rope, spend more money, use silk, silk is strong, and at the same time light weight.

Replace it with thick hemp rope, the hot air balloon needs traction after it is raised, and the weight of the hemp rope will delay things.

It is also easy to have an unstable attitude of the hot air balloon driven by the wind after the hemp rope is blown by the wind, which is very dangerous......"

Li Longji stood there and nodded, yes, hemp rope is not good, it doesn't matter if it's expensive or not.

As long as the money spent in the war can form the suppression of the troops, which is not piled up with money.

When it was almost time to eat, Li Yi finished speaking.

The craftsmen immediately ran to eat and came back to work overtime to study the hot air balloon.

Of course, to take turns to rest, Li Yi didn't want the craftsman to be too tired.

"Brother Yi, with this hot air balloon, my Tang soldiers will be able to kill many people.

Even a hot air balloon can accidentally fall off on its own, or be shot when the wind blows and the altitude decreases.

But they can deal more damage to the enemy, and it's worth it. ”

Li Longji thought that hot air balloons are not really invincible, but so what?

A hundred hot air balloons can form an army, kill 10,000 enemies, a hundred hot air balloons are all wasted, and all the sergeants on it are dead, worth.

"It's the operational danger that is the greatest, especially the wind.

In war, they want to use a bed crossbow to shoot a small point flying in the sky, unless they have a bed crossbow phalanx.

And that array also needs to be placed in the left and right positions in advance, the angle is adjusted, and the accuracy of the crossbow arrows is ensured. ”

Li Yi shook his head and said about the situation of hitting a hot air balloon more than a kilometer high with a large crossbow arrow.

The hot air balloon is on top and shoots arrows into the crowd without aiming.

Hit up below, look up, a small dot, how to aim?

"How can the enemy be deployed against hot air balloons? Charge? Rush over and grab the rope?

I believe that if the formation is to be breached, our soldiers will take the initiative to break the rope.

Or the person above cuts the rope from the other end, and it is impossible for the enemy to catch it. ”

Li Longji quickly thought of the situation and felt that it was the most stupid behavior for the enemy to charge into battle.

"The only thing that can compete with hot air balloons is hot air balloons." Li Yi said a classic sentence.

He had it then, and only tanks could fight tanks, and it was snipers who could deal with snipers.

The two of them came to the cafeteria, and the queen had already sat down, and she didn't make any additional requests today, but she didn't have an appetite.

"Brother Yi, if the enemy gets the falling hot air balloon, is it easy to imitate it?"

Li Longji served his favorite dishes and asked after sitting down.

"The balls and baskets are easy, nothing difficult, the fuel is the problem, we have alcohol, and we have blowtorches.

Blowtorches can adjust the size of the flame and control the altitude of the balloon.

You can't burn coal on it to start a fire, and if you burn firewood, the continuous fire of the firewood will be different.

You can't add firewood, but you can't remove firewood, right? However, there is fierce fire oil that is easier to burn, and with their technology, they cannot control the amount of fire power of fierce fire oil. ”

Li Yi knew that there was something that could provide enough calorific value, oil.

In some places, oil comes out of the ground, and everyone will use it to light fires.

"Uncle is right, their technology is not good, and the craftsmen there have taken what you have specially researched, and they can't imitate it."

Empress Wang didn't know what a hot air balloon was, she just supported Zhuangzi's argument that his technique was good.

Li Longji was completely relieved, thought about it, and asked in a low voice: "Brother Yi, I heard that you can fly?" ”

"The things used, as well as the ones monitored, are the same as those in my hospital, you can fly with a person at a critical moment, and you can't fly for too long."

Li Yi happily said what was going on.

"Oh, yes, it's good to have someone with me." Li Longji nodded and didn't say anything else.

For the next three consecutive days, nothing unexpected happened, and the old woman of the Xu family did not come, obviously there was no problem with the sealing needle.

On the morning of April 16, the hot air balloon was about to come out.

Everyone is ready to witness a miracle.

The queen and queen also wanted to see it, and stood there with their stomachs straight.

You're all set.

"Oops, my stomach hurts, I can't do it." The queen suddenly shouted.

"It's all stopped, go to the delivery room, and the stable woman is in place." Li Yi shouted.

Qing Song and Ge Yan immediately helped Queen Wang to lie down and pushed the car beside them, and the palace maids followed suit.

Queen Wang was sent to the delivery room, and Li Yi changed her clothes to prepare for the most critical moment.

"All the people with type O blood in Zhuangzi line up, and the nurse draws blood, and I have to put it over for processing, and then reserve it."

Li Yi instructed while changing his clothes, Queen Wang is type O blood, what type is nothing more than a title, he is used to calling it like this.

What he was most worried about was that there would be a special situation, and he was afraid that he would not be able to do it alone.

That requires supportive care, with hands at various locations, and then a large amount of plasma to thin the amniotic fluid in the blood.

If this is not the case, it is still troublesome to change a heavy bleeding.

The villagers were busy, and one of the eunuchs and palace maids ran out and found the people outside to say a few words, and the people on the other side rode on their horses and rushed to the imperial city.