The principle of hot air balloon lifting up is actually very simple. It is to use hot air to float the balloons to lift the gas and then convert it into a load-loaded balloon.

But this thing is the same as the joke from later generations:

Eyes, I can do it.

Brain, I will do it too.

Hands, you two fart...

This includes balloon material selection, combustion temperature control, gravity testing and many other standard things.

Just like the training of a car, even if you have all the hardware facilities and are first-class, you still have a hot chicken without good software training.

At this time, the first generation of hot air balloons developed by Zhang Dagong and Li Zhu and others had already been the result of hundreds or thousands of continuous experiments, and had basically reached the limit they could achieve at this time.

That's why Xu Changqing wants to try it himself!

‘If you know it on paper, you will always be shallow. You must practice it yourself to know it clearly.’

If Zhang Dagong and the others want to break through the bottleneck at this time, they don’t know how much time it will take. If it is normal, it’s nothing. Xu Changqing is willing to let them do more trouble, but at this time, the arrow is already on the string and has to be fired!

Xu Changqing could only take the shortcuts by himself!

Soon, Zhang Dagong and Li Zhu had finished explaining to Xu Changqing, and many craftsmen had assembled the hot air balloons.

Xu Changqing smiled and said to Hong Niangzi: "Sister Hong, are you ready?"

The Hong Madam couldn't help but take a breath of air conditioning.

She had known that Xu Changqing was brave, but she didn't expect that Xu Changqing's courage could be so great. This is really a matter of God...

But by this time, Xu Changqing was ready, and all the men and craftsmen around were watching. Even if the Hongniang was afraid, how could she retreat?

Thinking of this, she gritted her teeth and nodded heavily.

However, she wanted to say something to show her courage, but she was no longer in control and could not speak at all...

Fortunately, Xu Changqing reacted quickly and pulled her with a smile. She walked around here and there, and she was like a puppet carrying a string, and she was finally pulled into the basket by Xu Changqing.

After all, it is for military use and has to undertake bomb dropping tasks, so the hot air balloon is very large and the diameter of the basket is more than 1.5 meters.

The hot air balloon has not yet been spread out and is only placed on the ground, which has occupied a huge space.

"Okay, let's start."

Before the Hongniang could react, Xu Changqing had already checked the hot air balloon and made a starting gesture to Zhang Dagong and others.

Soon, everyone around quickly spread the hot air balloon, and Xu Changqing also ignited the flames of the stove and added fuel to it.

This fuel has been carefully prepared. At the beginning, it is not coal, but charcoal. Only after it is launched, the combustion effect will be improved with a stronger combustion force.

The materials including hot air balloons are also made of silk, numbness, oil cloth, and even fine animal skins, and there are as many as five layers.

As the flames in the stove continued to rise, the hot air balloon quickly swelled up like a magic trick, and then turned into a cloud covering the sky.

Feeling the steaming heat coming from the stove, Hong Madam came to her senses, but her legs had already become weak and she didn't dare to stand up at all. She could only subconsciously hug Xu Changqing's thighs.

Xu Changqing couldn't help but smile: "Sister Hong, relax, I'm fine in everything."

But at this time, Xu Changqing had no time to take care of Hongniang, so he began to pull the ropes and adjust the hot air balloons.

If a hot air balloon wants to successfully launch, in addition to these internal hardware and software facilities, another key core element is wind power!

If it was in the storm season of summer and autumn, let alone Xu Changqing, the first hot air balloon, would not dare to take it out rashly even if it was the advanced objects of later generations.

But it is late winter at this time, and the sea breeze is relatively soft and there is little change, which is the most suitable time to lift off.

Seeing Xu Changqing constantly controlling the hot air balloon like a mountain, Hongniang wanted to say something, especially she wanted to help.

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Xu Changqing, but his body was out of control, and he had no choice.

"oh--"

"The general is mighty!"

"It's taken off, it's taken off..."

At this moment, a shocking cheer suddenly came from beside him. The red lady's pupils suddenly magnified. She saw that the huge hot air balloon seemed like a miracle, and was gradually rising into the sky. The cheering crowd around her soon disappeared, and soon even the sound became small.

Wherever you see, there is only the vast sea surface, and the beautiful waves that roll in from time to time seem to have begun to grow louder.

Soon, the hot air balloon had risen to a height of more than 100 meters. Looking around, I could see all the mountains!

Xu Changqing couldn't help but open his mind, and felt that there was no cell in his body uncomfortable. While adjusting the hot air balloon to maintain stability, he smiled and said, "Sister Hong, get up, it's stable."

The Hongmao really came back to her senses. After trying a few times, it turned out that the hot air balloon seemed to be fixed and very stable. Then she carefully got up.

"Oh my god..."

But as soon as she saw the suffocating scene around her, she almost fainted, and subconsciously threw herself into Xu Changqing's arms, as if only there could she feel a little security.

Neither of them was wearing armor at this time. Although they were wearing thick bodies, the feeling of warm and soft jade still made Xu Changqing feel swayed.

He smiled secretly and said, "Why aren't you arrogant now?"

However, hot air balloons are the top priority. After enjoying the delicateness of Hong Niang for a while, Xu Changqing began to constantly encourage her and let her stand up by herself.

After a while, I felt that there was no danger. Then the Hongniang relaxed a little and began to bear it independently, enjoying this indescribable feeling.

Seeing that she got used to it, Xu Changqing also began to teach her how to operate hot air balloons, including some of the principles.

At this time, the afterglow of the setting sun gradually ended, and the hot air balloons had floated away from the island group and came to the vast sea. Looking around, countless people on the island were looking at this side excitedly and nervously, but they were as small as ants.

"Changqing, I, am I not dreaming, right? This is really beautiful! Ah——"

The Hongniang finally got used to it and began to truly enjoy this feeling. She couldn't help but spread her arms and screamed in a whisper.

She has never had such a happy time in her life as she was at this time, especially with Xu Changqing by her side.

The smile at the corner of Xu Changqing's mouth could not be concealed. It was like a painting, with the goal achieved, the beauty was on the side, the beautiful scenery was picturesque, and free!

However, after only feeling this kind of freedom for a while, Xu Changqing's mind returned to the topic.

Zhang Dagong, Li Zhu and his team's test, the maximum lifting height of the hot air balloon is about 150 steps.

Of course, this is just their predictions based on their eyesight, which are far from accurate enough.

This is also a major embarrassment at this time, and there are no practical measurement standards.

From this we can also see what a proud and great achievement of Emperor First Emperor’s “unified weights and measures”!

Without standard measurements, it is undoubtedly more difficult to accurately build a measuring instrument for altitude. Xu Changqing could only roughly estimate the height at this time with his eyesight.

From a purely military perspective, it is actually not enough to take 150 steps, and a height of 100 meters is enough.

Even if there were sharpshooters in the Qing Dynasty, shooting arrows into the sky and shooting flat were completely different concepts. The height of 100 meters was enough for them to see the dust.

However, for the sake of safety, 150 meters, or even 200 meters, can be considered the safest area.

After all, if a hot air balloon is not only successful, but also a miracle and a cloud that will always be over the head of Man Qing, you will never fail!

The weights and measures at this time of the Ming Dynasty were about 150 steps, which was about 220 meters, and the height of about 200 meters was a little close to the limit.

This makes it difficult to ensure that there will be no problems in materials, manipulation and other aspects. There are still many areas that need improvement and enhancement.

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Especially due to weight reasons, the fuel cannot be carried too much, and it is extremely tempting to attract wind direction. This means that if you want to use hot air balloons, aerial weapon that transcends the times, you must make the pre-war calculations accurate and accurate!

This is indeed very difficult, but at this time, this effect and this deterrence are definitely immediate and immediate results!

"Changqing, what are you thinking? Look, look at the big fish over there!"

At this time, the Hong Niang's cry interrupted Xu Changqing's thoughts. She obviously had a little temper, and she pinched Xu Changqing's arm in anger.

Xu Changqing hurriedly looked in the direction of Hongniang's finger and saw dozens of dolphins, as if the elves of the sea were playing naughtyly on the sea, sometimes jumping out of the water, shouting arrogantly.

Xu Changqing couldn't help but smile relieved.

Even though there are many crises in the sea, they are all elves of the sea from beginning to end!

Xu Changqing hesitated for a moment, but still held the graceful slender waist of Hongniang and smiled and said, "Sister Hong, are you happy today?"

Looking at Xu Changqing's slightly hot eyes, the Hongmaster's pretty face suddenly turned red. How could she not understand what Xu Changqing meant?

He couldn't help but bite the red lips hard.

However, after a moment, her tears could not stop like a spring, gushing outward, but there was no sound. She gritted her silver teeth and turned her head, not looking at Xu Changqing.

How could Xu Changqing not understand Mrs. Hong’s thoughts?

This is a bit of a sin...

However, the matter is finally solved, and escaping is definitely not a solution. Xu Changqing thought for a while and said solemnly: "Sister Hong, if you are not happy, I will talk about the military advisor. Haha, my Xu Changqing has no reputation at all, and I don't care about this at all. But don't worry, I can guarantee you that I will never hurt the military advisor."

Seeing that Mrs. Hong still didn't turn around, Xu Changqing wanted to say something else. Mrs. Hong suddenly turned around and hugged Xu Changqing hard: "Changqing, stop talking, forget it, just do it. I, I'm not worthy of you..."

As she said that, she lay on Xu Changqing's chest and burst into tears. She quickly made Xu Changqing's clothes wet and transparent.

"Sister Hong, why are you doing this? I, Xu Changqing, can swear that as long as I handle the matter quickly and I will marry you right away, I will definitely carry a sedan chair!"

"Changqing, you, don't say anything more. I am just like a willow, and I am already a broken willow. How can I be worthy of you? I...ah——"
To be continued...