Lu Su returned from Xudu and brought Lü Bu the title of Marquis of Chu.

Lu Bu and the others returned to the official palace and held a court meeting to discuss how to deal with what was about to happen.

In fact, he had long expected that Cao Cao would unite with Yuan Shao to deal with Xuzhou.

Xuzhou also has the same awareness and preparation.

The deployment of defenses in various places had already been prepared, and Lu Bu summoned everyone to come over, nothing more than to discuss who would lead the troops to meet which enemy army once the two armies of Cao and Yuan arrived.

The Cao family and the Yuan family have not yet moved, and the military strength of Xuzhou is not enough to go out to fight, so the specific situation is not clear, and the court cannot discuss a specific deployment plan.

At the court meeting, Lu Bu repeatedly reminded everyone that the Cao family and the Yuan family were likely to jointly send troops to attack Xuzhou in the near future, asking them to make plans earlier.

When the court discussion dispersed, Lu Bu stopped Pang Tong.

Only Pang Tong and the two of them were left in the front hall.

"Have you ever developed a balloon?" Lu Bu asked Pang Tong.

"According to the process explained by Chu Hou, the craftsmen did make it." Pang Tong replied: "It's just that there are still some places that can't be handled, which is a headache." ”

"What's the headache?" Lu Bu asked.

"It's just that it's in the air, and it's a little difficult to fall." Pang Tong replied: "The hot air is circling in the balloon, and when it gets cold, it has already flown past the place where it was intended to land." ”

"Take me to see it." Lu Bu greeted, and Pang Tong led him to the air force barracks.

The air force barracks occupy a large area, but the number of officers and men living in it is not very large.

Lu Bu and Pang Tong arrived, and Zhao Yun, who got the news, came out.

"Chu Hou!" Zhao Yun greeted.

Lu Bu asked, "Are the soldiers diligent in their daily training?" ”

"Flying in the air, a careless thing is fatal." Zhao Yun said with a smile: "They are also quite diligent in practice. ”

When Lu Bu came to the air force barracks, the soldiers were practicing gliders.

In the first few days of the construction of the air force, the soldiers flew into the air with gliders, and the people of Pengcheng would stop and watch.

Later, the people of Pengcheng became accustomed to the fact that there were an unknown number of people flying around their heads every day.

The Air Force exercised, and no one deliberately stopped, as if it was just some inconsequential big birds flying in the air.

In the sky above the barracks, there were many gliders flying high and low, Lu Bu glanced up, and followed Zhao Yun and Pang Tong to the depths of the barracks.

In the air force barracks, two open spaces were opened.

In one of them, there were a lot of gliders in the queue earlier.

Not long after coming to Pengcheng, Lu Bu tried to fold the skeleton of the glider and put it in the warehouse when not in use to avoid rapid aging in the wind and sun.

Now there is not a single glider in that open space, there are just air force officers and men running around busy taking off and landing.

The other open space is in the deepest part of the barracks.

When Lu Bu arrived, there was only a hot air balloon in the clearing.

Next to the hot air balloon, there are more than a dozen craftsmen who are busy with something.

The craftsmen are still discussing something around the hot air balloon.

Zhao Yun and Pang Tong accompanied Lu Bu over.

It may have been too focused on pondering the problems that needed to be solved, until they came to the hot air balloon, and the craftsmen did not find out.

Pang Tong coughed lightly.

Only then did the craftsmen realize that there was someone next to them, and quickly turned their heads to look over.

When the craftsmen saw Lu Bu and the others standing aside, they quickly turned to face them and bowed one after another.

"How's it going?" Lu Bu asked as he circled around the hot air balloon.

"Nothing else, you can adjust the direction after you go up." One of the craftsmen replied, "It's just that it's a little troublesome when you come down." ”

"What's the trouble?" Lu Bu asked.

"After the ceasefire, the hot air in the balloon was not cold, and by the time the heat cooled down, it had already flown a considerable distance." The craftsman replied: "If you want to land in the chosen place, you have to cease fire in advance." And how far it will fly after the ceasefire, no one can say. ”

"That's not going to work." Lu Bu ordered: "You light up the balloon, and I'll see what's going on." ”

The craftsmen received the order, and someone jumped on the basket under the balloon and lit the brazier.

The flames burned, the heat rose to the top, and the deflated balloon was soon full.

When the balloon was about to take off, Lu Bu shouted: "Ceasefire!" ”

The craftsman hurriedly closed the brazier.

Unable to make contact with the air, the flames were quickly extinguished, and the balloons that held a lot of hot air swayed back and forth in the wind.

The basket hanging under the balloon also swayed back and forth in the wind.

Walking under the basket, Lu Bu raised his face and looked inside the balloon.

"There's no opening in the balloon?" After taking a closer look at the inside of the balloon filled with hot air, Lu Bu asked the craftsmen.

The craftsmen looked at each other, not understanding why they wanted to make a hole in the balloon.

"Make an opening in the balloon, and once there is a ceasefire, the heat will quickly spill out of the hole above." Lu Bu said: "The person who controls the balloon only needs to control the size of the flames, and there is no need to wait for the heat inside to cool down when landing." ”

"In that case, when will the heat be filled?" The craftsmen looked at Lu Bu in astonishment, and someone asked: "If you make an opening on it, wouldn't it be a ...... while pouring hot air?"

What Lu Bu said next blocked the craftsman's words: "Make a roof, and when you need to fill it with hot air, plug the hole entrance." When it's time to land, pull it away. The more the gap is opened, the faster the hot air will flow out, and there is no need for a ceasefire at all, and the purpose of landing can be achieved. ”

The method he said earlier was to make an opening in the balloon and use the size of the flame to determine the rise and fall.

At this time, it was replaced with an opening, and then a skylight was made under the opening.

Close the sunroof when you need to fill it with heat, and open it when you need to land.

Controlling the size of the skylight is much simpler than controlling the flame.

The craftsmen had already understood what he meant, and hastened to agree.

The balloon construction is actually very simple, and all that needs to be solved is some details.

Lu Bu reminded how to solve the problem of balloon landing, and seeing that the craftsmen had already understood, he greeted Pang Tong and Zhao Yun: "It won't be long before a big war comes." The role that the Air Force can play at that time will be crucial. The lack of gliders is secondary, and the balloons have to be hurried up. If it can't be overwhelming, our air force will basically not be of much use. ”

Pang Tong and Zhao Yun both agreed.

Lu Bu patted Zhao Yun on the shoulder: "The role that the air force can play now is still used to surround the enemy." Zilong has a long way to go in the future, and the burden on his shoulders is not light. ”