Zhangsun obviously did not have much interest in this question, but seeing that everyone was discussing, he could only glance at it and reply, "Two miles it is."
"I don't think so."
Du Gou crossed his arms in front of his chest. He seemed to have a different opinion. He also looked down and curled his lips, "I think one and a half miles."
Zhang Feng nodded and did not refute. He recorded everything everyone said in his notebook.
These were all important data. Even if they were one and a half miles above the ground, the hot air balloon had stopped moving in the air. This meant that the hydrogen this time could only support the weight of four people, and it was one and a half miles above the ground.
If they wanted to fly higher next time, they would need to add more hydrogen, at least more than this time. This way, they could basically guarantee that they could fly higher than this time. This could be used in the military.
On the other hand, if they wanted to fly lower, they could add less hydrogen, at least less than this time. That way, they could fly lower than this time. This way, they could use it for agriculture.
After recording everything, Zhang Feng was just about to speak when a gust of cold wind blew. Feeling the chill, he quickly said, "Throw two sandbags down."
Cheng Chumo and the others had made hot air balloons before, so they naturally knew what the sandbags were for. It was nothing more than to lighten the load and use the wind to change the direction of the balloon. Knowing this, each of them threw a sandbag down.
As the weight of the hot air balloon decreased, the cold wind blew and its direction slowly began to change.
Soon, the hot air balloon began to make a sharp turn and floated down.
Zhang Feng sat in the basket, holding a pen in one hand and a notebook in the other, recording the wind direction and the speed of the hot air balloon's deviation.
Cheng Chumo and the other two snuggled together. This time, it was strange that they did not shout. Perhaps it was because they were curious. The three of them stared closely at Zhang Feng's notebook and were somewhat puzzled. .
Zhangsun could not help but ask, "Feng Zi, the wind is so strong. What are you writing in that notebook of yours?"
Zhang Feng rolled his eyes at Zhangsun Chong. "What do you know? If Lao Tzu didn't record and experiment again and again, how many times could you survive? I'm afraid there aren't any left. "
After that, he ignored the three of them.
However, his words made Zhangsun, Chong, and the others feel uncomfortable.
Did he really think that Lao Tzu was a lab rat?
The last experiment?
Resentment was resentment, but on second thought, this kid was still a responsible person.
He even knew how to record it down and wouldn't do any useless experiments.
With that thought, Du Gou looked at Zhang Feng and asked, "Feng Zi, what are you recording? Take it out and let me have a look. "
Zhang Feng frowned. He put down the pen in his hand and glanced at the three of them. "You don't understand. It's useless even if I show you. If you have the time, why don't you see how far we are from the surface?"
Du Gou nodded and did not refute. He glanced down and said in surprise, "We're almost there. It's less than half a mile."
As soon as he said that, Cheng Chumo and Zhangsun Chong stood up and looked down. Sure enough, they were not far from the surface. They cheered, "We're here. We're almost there."
Zhang Feng glanced at Cheng Chumo and the others. "We're here. What's there to be surprised about?"
Cheng Chumo was deflated. He glared at Zhang Feng and did not say anything. He cheered with Zhangsun Chong and the others.
After about the time it took to smoke a cigarette, the hot air balloon swayed as if it had hit something. Zhang Feng quickly got up and glanced down. It turned out that they had reached the surface.
He was about to ask Cheng Chumo and the others to get down. Unexpectedly, these fellows were even more enthusiastic than him. The hot air balloon had just touched the ground when these fellows had already jumped down.
Zhang Feng shook his head and smiled. He slowly walked down from the hot air balloon.
As soon as he came down, Ma Zhou ran over. He looked at Zhang Feng expectantly. "Teacher, how was it just now? Is there any important news? "
Zhang Feng handed the book in his hand to Ma Zhou and said with a serious face, "Just now, we were about half a mile to two miles in the sky. This is related to the hydrogen you injected into the hot air balloon. Remember, if you want to fly higher next time, you have to inject more hydrogen and put less sandbags. If you want to fly lower, inject less hydrogen and put more sandbags. Understand?"
Ma Zhou handed the book in his hand to Hao Chujun and nodded. "Understood, teacher."
Hao Chujun also nodded, indicating that he understood.
Zhang Feng glanced at the sun in the sky. Seeing that the sun had set and the surroundings were starting to fog, he looked at everyone. "That's all for today. If there's anything else, we'll talk about it later."
Cheng Chumo and the others finally breathed a sigh of relief.
The experiment was finally over. There was no need to suffer.
They kept cheering as if they were celebrating something.
The corner of Zhang Feng's mouth twitched. He thought to himself, 'Is it so torturous to sit in my hot air balloon? These fellows. '
With that thought, he turned around and prepared to leave. At this moment, Hao Chujun spoke. He said with some disappointment, "Teacher, are you still coming tomorrow?"
"I won't be coming tomorrow."
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