Seeing branches blooming everywhere, the good time is passing by with piles of brocade.

In Yuyuantan, thousands of trees and flowers are in full bloom, making it look like a pink ocean.

When the breeze blows, countless petals fall down, just like a rain of flowers.

However, no one had the heart to even look at the stunningly beautiful cherry blossoms; their attention was completely attracted by the huge colorful ball.

“Wow, it’s so big!”

“So beautiful!”

"Am I dreaming?"

The girls also forgot about their image and started screaming excitedly in the carriage.

Nothing else is needed, just this beautiful big colorful ball is enough to completely conquer their hearts.

The boys shouted excitedly and rode their horses to the colorful ball.

When they came closer, everyone looked up at the huge round ball made of silk, their mouths open, speechless.

Words could no longer express their shock at this moment.

After a long while, Liu Si De finally uttered a curse:

"Big, really fucking big..."

Many people looked at Zhao Hao and became convinced.

Not to mention anything else, just the fact that it is such a huge thing is not something that ordinary people can do.

In fact, Zhao Hao was also shocked.

Although he designed it himself and directed its manufacture, Zhao Hao was still deeply shocked when a hot air balloon with a diameter of nearly three meters actually appeared before his eyes.

The disciples had already been busy at the scene. When they saw their master coming with the audience, they quickly put down their work and came forward to greet him.

In fact, most of them only came to help today.

The real heroes who built this huge building were Zhang Jian and Zhao Shizhen.

This thing took them two full months of hard work.

More than two months ago at the Lantern Festival fair, Master Zhao used an exaggerated performance to prevent his father and the eldest princess' affair from being discovered in public.

Later, in order to smooth things over, he made a bet with the sons and daughters of the university scholars about the manned Kongming lantern.

After returning home, he used the little time before the retreat to draw a sketch of the hot air balloon and gave it to the two talented engineers.

Of course, Master Zhao would not admit that he was making a childish bet, but instead declared that this was a groundbreaking and great scientific experiment - it would be the first time in human history that a person would be sent into space!

So no matter how good the concept is, it all depends on the packaging. Zhao Shizhen and Zhang Jian were excited when they heard it.

What a dreamy scene this is! Who hasn’t dreamed of flying into the sky?

Allowing humans to soar in the sky like birds is absolutely an irresistible desire for all engineers!

So the two of them put down all the work at hand and devoted all their efforts to the hot air balloon experiment.

First, they placed a silk bag on the burning charcoal brazier. Sure enough, they saw the bag gradually fill up in the heat and float in the air without the help of anyone.

This shows that the scientific principle taught by the master is correct - the density of hot air is smaller than that of cold air, so the same volume of hot air is lighter than cold air and produces buoyancy. Therefore, the hot air will rise above the cold air!

Of course, the two craft fanatics have made countless Kongming lanterns since they were young, and they had actually already vaguely realized this.

But once they understood the scientific principles behind it, they knew what to do.

You can build it bigger, even bigger. As long as it is big enough, an elephant can carry you to the sky!

They followed the formula taught by their master and continued to increase the size of the hot air balloon. From design to model, and then to miniaturized test flights, and animal-carrying test flights, step by step to today, each step has been strictly demonstrated and reviewed, and finally we have the super-large hot air balloon with bamboo strips as the keel, double-layer silk as the skin, and Eucommia gum painted inside and outside.

The only drawback is that this hot air balloon cannot provide heat itself and relies on an external fire source to generate updrafts.

This is because the two men discovered during the experiment that if they followed their master's original design - hanging a brazier containing a mixture of pine torches and animal fats above a hanging basket - it would easily cause a fire.

After all, the entire hot air balloon is made of flammable materials. When encountering turbulence, just a little bit of a full basin of burning oil spilled is enough to turn the balloon into a fireball.

The two had some disagreements on this point.

One thought that success was the most important thing in an experiment, but the other absolutely could not accept an experiment that could kill people.

So before Zhao Hao went into seclusion for the second time, the two of them asked Zhao Hao about this issue again.

Zhao Hao naturally couldn't let his performance be dangerous, and it was not realistic to produce a water gas cylinder in a short period of time.

It seems that we have to take one step at a time and not skip a step.

He had no choice but to modify the design, remove the internal fire source, change the basket into a hollow ring, and redesign it according to the appearance of the first manned hot air balloon in human history.

This is what everyone sees now.

~~

"Can something this big take off?"

Although they were shocked, few people believed that such a huge creature could fly into the sky.

After all, the rattan hanging basket itself must weigh 100 to 200 kilograms, right? Add the keel and silk skin, and it must weigh 300 to 400 kilograms.

A person weighing over 100 pounds cannot fly, so how can an object weighing 300 or 400 pounds possibly get into the sky?

"Hey, Brother Zhao, I'm not criticizing you." Xu Yuanchun shook his head and sighed, "It's really a waste of money and manpower, and it's useless."

"This is the dream of all mankind, and it is reasonable to spend some money." Zhao Hao smiled faintly.

"That's right. My brother Zhao earns his own money and can spend it however he wants."

Li Mingyue jumped off the carriage, ran to the side of the shelf, stared at the hot air balloon in fascination and asked, "Can it really fly?"

"Of course." Zhao Hao pointed at the rattan hanging basket and said, "It can accommodate two people. Who dares to ride with me?"

"Me, me!" Li Mingyue immediately volunteered.

Seeing that she was getting carried away, Zhang Xiaojing hurriedly reminded her in a low voice: "Lady, lady..."

Li Mingyue then remembered her own personality and quickly restored her ladylike appearance, lowering her head and whispering, "I dare not."

The disciples had already received instructions and all of them acted as tools without saying a word.

Xu Yuanchun and others were intimidated and did not dare to risk their lives.

Qiaoqiao is afraid of heights, but Ma Xianglan is eager to try. However, as a secretary, she will not steal the limelight at this time.

Well, when everyone dares not to, this secretary will risk her life to accompany you...

Zhang Xiaojing murmured a few times, looked at Li Mingyue, and finally held back.

"Then let me try?" The young master was excited to see the prey, although he was a little nervous, but based on his understanding of Zhao Hao, since the other party dared to say this, it should be safe.

Before he could finish his words, he felt a sinister gaze coming at him from the side.

You don't need to look to know that it's your sister using her powers.

Li Chengen said bitterly: "I am too heavy, let Mingyue stay with me, she is lighter."

"Brother said so." Li Mingyue smiled in her heart, and walked to Zhao Hao and said, "Then I will give it a try..."

"Are you not afraid anymore?" Zhao Hao reminded with a smile: "It will fly very high, it's still quite scary."

Li Mingyue is afraid that she can't fly high enough. The higher she flies, the happier she will be!

"I'm not afraid as long as I have big brother here." Li Mingyue 'mustered up her courage' and looked up at Zhao Hao.

"Okay, let's go up." Zhao Hao took the lead in climbing the bamboo ladder and entering the hanging basket.

Then he reached out and pulled Li Mingyue, who had climbed up, into the hanging basket.

The disciples lit the fuel pile under the bamboo frame. The flames burned fiercely, and the hot air flowed into the balloon through the chimney.

As the balloon continued to fill, the upward buoyancy grew stronger and stronger, pulling all four mooring ropes straight and taut.

Zhang Jian, who had been paying close attention to the inflation process, shouted, "Cut!"

The four brothers swung their axes at the same time and cut all the ropes.

The big balloon filled with hot air slowly rose into the air with the two of them amid the exclamations of the crowd.

ps. The fifth update, 10900 more updates, please give me monthly tickets and recommendation tickets~~