Hao Chujun and the other two were at a loss as to what to do. They looked at Zhang Feng and were about to say something when Zhang Feng waved his hand to stop them. He smiled at Cheng Chumo and the others and said, "Iron Bull, I know you feel cold in the sky, but this is for science and for the Tang Empire. You have to sacrifice once. As for Ma Zhou and the others, they cannot go to the sky …"
"Why can't they go to the sky? Are you trying to trick us? "
Du Gou was a little unconvinced.
"Do you think they can go to the sky with their physiques?"
Zhang Feng snorted and said angrily, "Besides, if they go to the sky, who will record the data underground? You?"
Everyone looked at each other.
Although they didn't know what data was, Feng Zi said it so confidently. It should be something very important. They couldn't say much.
It was just that …
They were more or less repulsed by the idea of going to the sky.
They had just been thrown down last time. No one was willing to go there again.
Cheng Chumo said embarrassedly, "Feng Zi, it's not that we don't want to go to the sky, but it's a little too cold. Can you relax a little? Or we can go find some people? "
He had already thought about it. As long as Feng Zi agreed, he would go outside and find some irrelevant people. At most, he would pay some money.
However, Zhang Feng obviously didn't think so. He frowned. He hated these guys' excuses the most. He waved his hand and said, "No, you have been there before. I don't feel at ease letting others go. At most, I'll let you take some things to keep warm. Is that okay?"
Cheng Chumo looked at Zhangsun and the other two. Seeing that he couldn't refuse, he said, "Well, you have to prepare more."
Zhang Feng nodded and then looked at Ma Zhou and the others. "You go and prepare some things to keep warm. Try to hurry."
Ma Zhou and the others didn't hesitate. They turned and ran away. After a while, they came back with all kinds of quilts and cotton-padded clothes.
Zhang Feng casually glanced at it and then passed it to Cheng Chumo and the others. "Here, the quilt and cotton-padded clothes are all yours. Put them on and go up."
Cheng Chumo and the others reluctantly took the cotton-padded clothes and slowly boarded the hot air balloon.
After everything was ready, Zhang Feng looked at Ma Zhou and the others. "Untie the ropes and take off."
Ma Zhou nodded and quickly untied the hemp rope. The hot air balloon slowly rose at a speed visible to the naked eye.
This time, it was much more stable, unlike the last time when it kept rising. Cheng Chumo and the others seemed to be used to all this. They didn't roar and just sat in the basket in a daze.
The hot air balloon flew higher and higher, slowly passing through the clouds. After about an incense stick's worth of time, it finally stopped in the air.
Cheng Chumo and the others sat in the hot air balloon, snuggling with each other. Their eyes were unfocused, as if everything outside had nothing to do with them.
On the ground, Zhang Feng raised his head and glanced at Ma Zhou and the others from time to time. He said, "Remember, after using wax water to seal the hot air balloon, it's obviously much more stable. There are no more swings, and there shouldn't be any air leakage."
The two of them replied with an "oh" and started writing in their books.
This experiment was very important to them. Not only did it solve the problem of air leakage, but it also stabilized a lot. It was undoubtedly a huge improvement.
However, they soon thought of other problems.
Just now, Tie Niu and the others came down because of air leakage. Now that this problem was solved by their benefactor, how were they going to come down now?
The air in the hot air balloon was sealed. As long as the air was not exhausted, it would be very difficult for them to come down.
Thinking about this, Hao Chujun quickly asked, "Benefactor, wait, how are Brother Tie Niu and the others coming down?"
How are they going to come down?
Zhang Feng frowned.
He suspected that this guy had become stupid from studying. Didn't he come down just now? Why couldn't he come down now?
He replied in a bad mood, "They'll come down now the same way they came down just now. Are you stupid?"
"Benefactor, have you forgotten?"
Hao Chujun's expression changed, and he quickly reminded, "Brother Tie Niu and the others came down just now because of air leakage. Now that you've solved this problem, how are they going to come down now?"
Zhang Feng was startled.
Hao Chujun's words reminded him.
That's right, I've already blocked this flaw.
As long as the air inside was not exhausted, it would be very difficult for them to come down, unless …
He glanced at the two of them and quickly said, "Did you prepare sandbags or other heavy objects on the hot air balloon just now?"
The rise and fall of a hot air balloon was related to the temperature inside the balloon. When the temperature inside the balloon was high, the weight of the balloon would decrease. When the buoyancy was lower, the balloon would rise. When the temperature of the air inside the balloon dropped, the buoyancy produced by the balloon would be lower than the weight and weight of the balloon, and the balloon would begin to fall.
However, this method could not be used in the hot air balloon that was currently being developed.
Therefore, they could only rely on heavy objects, such as sandbags and other things.
Because the direction of the wind at different altitudes was different, the airflow produced was also different. If they wanted to rise, they would have to throw down the heavy objects on the hot air balloon. Following the direction of the airflow, they would change their direction and altitude.
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