The two of them nodded as if they understood.
Seeing this, Zhang Feng continued, "But the effect of this coarse cloth is not very good. It is too porous. You can try a new material next time."
"Teacher, what material should we use?"
Ma Zhou asked subconsciously.
Hearing this, Zhang Feng paused.
The hot air balloons of later generations were basically made of reinforced nylon or polyester. These two materials were relatively light and very strong. The most important thing was that they were not breathable. But there were no such materials now.
Although the coarse cloth could be used temporarily, it was too porous. He had to change to another material.
But what to change to was difficult for him.
Ma Zhou and Hao Chujun stood aside and did not dare to say anything, for fear of interrupting their teacher's thoughts.
About a quarter of an hour later, a faint smile appeared on the corner of Zhang Feng's mouth as he slowly said, "Change it to silk."
"Silk?"
Ma Zhou and Hao Chujun looked at each other and said almost at the same time.
Because they all knew that silk was very expensive in the Tang Dynasty. Generally, only rich people had the money to use it. Now their teacher said to use silk. Where could they get it?
Seeming to see the two of them, Zhang Feng smiled and said, "You don't have to worry. I will get it for you."
In fact, he had long wanted to change to another material, but he just thought of silk and said it.
Silk had good hygroscopicity, ultraviolet resistance, and heat resistance. With these characteristics, the hot air balloon could operate normally whether it was hot or rainy.
Although it was a little expensive, it was still worth a try. After all, research was to find the right way out of thousands of wrong ways.
Seeing Zhang Feng say so, the two of them did not say anything and nodded together, "Yes, teacher."
"Not only that, you can also try to change other experimental equipment."
Zhang Feng glanced at the two of them and said.
Now the hot air balloon had taken off, but it still needed the help of wind. It must be constantly experimented with other materials and replaced.
"Yes, teacher. We understand."
The two of them cupped their hands and replied.
Zhang Feng nodded with satisfaction. He was very satisfied with these two disciples. They had good comprehension ability and he believed that they would not let him down.
"Since you all understand, I'll take my leave first. If you have any questions, come to the Academy to look for me."
He glanced at the two of them and was very pleased. After saying that, he walked towards the door of the laboratory.
"Disciple respectfully sends off Master."
The two of them said in unison.
"There's no need to send me off. It's not like I can't find my way."
Zhang Feng waved his hand nonchalantly.
Ma Zhou and Hao Chujun were stunned for a moment. They knew that their teacher was not a pedantic scholar who was bound by etiquette, so they did not pay much attention to it. They stood where they were and pretended to send him off respectfully.
Zhang Feng smiled faintly and walked out of the door alone. It seemed that the pacification this time had a good effect. The two of them also had an appearance of humility.
Along the way, he was thinking about the silk. Now the silk of the Tang Dynasty was more expensive than gold. It was a little difficult to get it. However, coarse cloth was indeed not a long-term solution. It was easy to leak. It seemed that he had to ask Cheng Chumo and the others for help.
He did not speak on the way back. In a moment, he returned to the Academy. At this time, it was the end of the class. The Academy was full of laughter. A few roars could be heard from the basketball court. The students who had free time strolled in the Academy. When they saw Zhang Feng, they all went up to greet him.
"Hello, Dean."
"Hello."
Zhang Feng smiled and continued to walk to his residence.
However, when he passed by the basketball court, a resentful sigh attracted his attention.
He saw a group of people around the basketball court. They were wearing short-sleeved shirts and seemed to be discussing something.
Zhang Feng's curiosity led him to walk over. He looked at the people sitting around and could not help but ask, "What are you all doing here?"
Hearing this, everyone turned their heads. When they saw that it was Zhang Feng, they quickly stood up and said respectfully, "Hello, Dean."
Zhang Feng nodded and continued to ask, "What are you all talking about here?"
Everyone lowered their heads and looked at each other. It seemed that they had something to say.
Zhang Feng was a little annoyed. He glanced at an acquaintance in the crowd and said, "Yun Ping, tell me, what's going on? Don't dawdle like a woman. "
"This …"
Yun Ping looked at the crowd hesitantly. In the end, he made up his mind and said slowly, "Dean, it's like this. After class, we played with another team in the Academy. We didn't expect that we would lose …"
At this point, he paused and blushed.
"What happened after that? Continue. "
Zhang Feng hurriedly urged. Just when he was getting excited, this kid actually stopped talking. He really suspected that this guy was deliberately whetting his appetite. He had to teach him a lesson in the future.
"After that, we were not convinced and agreed to play again later. Now, aren't we here to discuss tactics?"
Yun Ping was a little resentful. As he spoke, he would turn around and glance at his companions. It was as if he was saying, 'It's all your fault. Now, you've been caught by the Dean.'
He was like a little quail. He lowered his head and waited for Zhang Feng's punishment. The people behind him were the same. They lowered their heads as if they were afraid that Zhang Feng would punish them.
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