Seeing the branches blooming everywhere, Shaoguang is piled up.

In Yuyuan Lake, the cherry blossoms of ten thousand trees are in full bloom, like a sea of pink.

As soon as the breeze blew, countless flower petals fell one after another, like a rain of flowers.

However, everyone didn't bother to look at the stunning cherry blossoms, and their eyes were completely attracted by the huge colorful ball.

"Wow, that's big!"

"It's so beautiful!"

"Am I dreaming?"

The girls also forgot about their images and screamed excitedly in the carriage.

There is no need for anything else, just this beautiful big colored ball will completely conquer their hearts.

The boys screamed with excitement as they rode their horses to the ball.

When they came near, all of them looked up at the huge ball of silk, and all of them were speechless with their mouths open.

Words can no longer express their shock at this moment.

After a long time, Liu Side burst out with a foul language:

"Big, fucking ......"

Many people looked at Zhao Hao's gaze, and they all became convinced.

If nothing else, just talking about making such a super big thing is not something that ordinary people can do.

In fact, Zhao Hao was also shocked.

Although this was designed by him and manufactured under his own guidance, Zhao Hao also felt deeply shocked when a hot air balloon with a diameter of nearly three zhang really appeared in front of his eyes.

The disciples had already been busy at the scene, and when they saw the master coming with the audience, they hurriedly put down their work and came up to meet them.

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

The heroes who really created this behemoth were Zhang Jian and Zhao Shizhen.

It took them two hours to do this.

At the temple fair of the Shangyuan Festival more than two months ago, Zhao Gongzi used an exaggerated performance to avoid the adultery between his father and the eldest princess from being broken in public.

Later, in order to round the field, he made a bet with a group of university scholars to carry Kong Minglantern.

When he returned home, he used a little time before the retreat to sketch a hot air balloon and throw it to the two talented engineers.

Of course, Zhao Gongzi will not admit that he is making a childish bet, but declares that this is an epoch-making great scientific experiment - it will be the first time in human history to send people into the sky!

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

What a dreamy scene this is, who hasn't dreamed of flying into the sky?

Letting humans soar through the sky like birds is definitely a temptation that all engineers can't resist!

So the two put down all the work at hand and went all out to carry out the hot air balloon experiment.

First, they placed a silk bag on a burning charcoal basin, and sure enough, they saw that the pocket was gradually filling in the heat, and without the help of anyone's strength, it floated in the air.

This shows that the scientific principle taught by Master is correct - the density of hot air is less than that of cold air, so the same volume of hot air is lighter than cold air and produces buoyancy. As a result, the hot air rises above the cold air!

Of course, the two handmade madmen don't know how many Kong Ming lanterns they have made since they were children, but they have long been vaguely aware of this.

It's just that when they understand the science, they know what to do.

If you want to make it bigger, bigger, as long as it is big enough, the elephant can send you to the sky!

They follow the formula taught by the master and keep increasing the size of the hot air balloon. From the design to the model, and then the miniaturization test flight, the animal test flight, step by step to today, every step has gone through strict argumentation and review, and only then did we have this super large hot air balloon with bamboo strips as the keel and double-layer silk as the skin.

The fly in the ointment is that the balloon itself cannot provide heat and relies on an external fire source to generate updrafts.

This is because the two of them found in the experiment that if the brazier mixed with pine and animal fat was suspended on the hanging basket according to the master's original design, it was easy to cause a fire.

After all, the entire hot air balloon is made of flammable materials, and when the air flow is bumpy, a basin full of burning grease just needs to spill a little, which is enough to turn the balloon into a fireball.

On this point, the two have some disagreement.

One thinks that success is the most important thing in experimentation. But the other is absolutely unacceptable, an experiment that will kill people.

So before Zhao Hao's second retreat, the two consulted Zhao Hao on this issue.

Zhao Hao naturally can't let his performance be dangerous, and it is unrealistic to make a water gas cylinder in a short period of time.

It seems that the road still has to be taken step by step, and there is no step to jump.

He had no choice but to revise the blueprint, cancel the internal fire source, change the gondola to a hollow ring, and honestly redesign it according to the appearance of the first manned hot air balloon in human history.

That's what everyone sees at this moment.

~~

"Can something this big take off?"

Although it was shocking, few people believed that such a behemoth could fly into the sky.

After all, the rattan hanging basket itself alone costs one or two hundred catties, right? Coupled with the keel and silk skin, three or four hundred catties are absolutely available.

A hundred pounds of people can't fly, how can something weighing three or four hundred pounds go to the sky?

"Hey, Brother Zhao Xian, it's not me who criticizes you." Xu Yuanchun shook his head and sighed: "It's really hard work and money, big and useless." ”

"This is the dream of all mankind, and it is also appropriate to break the cost." Zhao Hao smiled faintly.

"That's it, my brother Zhao makes money by himself, and he can spend it as much as he wants."

Li Mingyue jumped out of the carriage, ran to the edge of the shelf, looked at the hot air balloon dizzily and said, "Can it really fly?" ”

"Of course." Zhao Hao pointed to the rattan hanging basket and said, "There can be two people sitting on it, I don't know who dares to ride with me?" ”

"Me, me!" Li Mingyue immediately volunteered.

Seeing that she was carried away, Zhang Xiaojing hurriedly reminded in a whisper: "Lady, lady......"

Li Mingyue then remembered her own personality, and quickly restored everyone's beautiful appearance, bowed her head and said, "I don't dare." ”

The disciples had already been instructed, and they all acted as tools without saying a word.

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

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

Well, when everyone doesn't dare, this secretary will sacrifice his life to accompany his son......

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

"Then I'll try?" The little lord was happy to see the hunt, although he was a little worried, but with his understanding of Zhao Hao. Since the other party dares to say this, it should be safe.

Before he could finish speaking, he felt a gloomy gaze cast from the side.

You don't have to look at it, you know that it's your sister doing her work.

Li Chengen said with a bitter face: "I'm too heavy, let's let Mingyue and my brother be together, she's light." ”

"That's what my brother said." Li Mingyue smiled in her heart, walked to Zhao Hao's side and said, "Then I'll try it......"

"You're not afraid?" Zhao Hao reminded with a smile: "It's quite scary to fly very high." ”

Li Mingyue is afraid that she can't fly high, the higher she is, the happier she is!

"There's a big brother here, don't be afraid." Li Mingyue 'mustered up courage' and looked up at Zhao Hao.

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

Then he stretched out his hand and pulled Li Mingyue, who climbed up, into the hanging basket.

The disciples lit the fuel pile under the bamboo frame, and the flames burned brightly, pouring heat down the chimney into the balloon.

The balloon continued to fill, and the upward buoyancy became more and more intense, pulling all four tethered ropes straight and tight.

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 off all the tie-down ropes.

The big balloon full of hot air slowly took off with the two of them in the exclamation of everyone.

ps. The fifth change, 10090 plus more, ask for a monthly pass, recommended ticket~~