Chapter 1938

Seeing that they were also shot while lying down, Hao Chujun was at a loss. He looked at Zhang Feng and was about to speak. Zhang Feng waved his hand to stop them, smiled and looked at Chumo and others: "iron cow, I know you are cold in the sky, but you sacrifice once for the sake of science and the Tang Dynasty. As for Ma Zhou, they can't go to heaven..."

"Why can't they go to heaven? You're biting us?"

Du Gou was a little unconvinced.

"Do you think their physique can go to heaven?"

Zhang Feng snorted and said angrily, "besides, if they go to heaven, who records data underground, do you?"

Everyone looked at each other.

Although they don't know what data is, it should be a very important thing to see Fengzi's promise. Not a lot of words.

Just

There is still some rejection in my heart about God.

I just fell last time and now I go again. No one wants to go.

Chumo was embarrassed and said, "Fengzi, it's not that we don't want to go to heaven, but it's too cold. Can we slow down? Or let's find some people?"

He has already thought about it. As long as Fengzi agrees, he will go outside to find some irrelevant people. It's a big deal to give some money.

However, Zhang Feng obviously didn't think so. He frowned and hated these guys' shirking words most. He waved and said, "no, you've been up before and have experience. I don't trust you to let others go. At most, let you take something to keep out the cold. Is that ok?"

Chumo glances at Chang sun Chong and sees that he can't get rid of them, so he has to say, "well, you have to prepare more."

Zhang Feng nodded and then looked at Ma Zhou and others: "go and prepare something to keep out the cold. Try to hurry up."

Ma Zhou and others didn't ink, so they turned and ran away. After a while, they came back with all kinds of quilts and clothes.

Zhang Feng looked at it and then handed it to Chumo and others: "come on, here are your quilts and clothes. Put them on."

Chumo and others reluctantly take over the cotton padded clothes and slowly board the hot-air balloon.

When everything was ready, Zhang Feng looked at Ma Zhou and others: "untie the hemp rope and take off."

Ma Zhou nodded and soon untied the hemp rope. The hot-air balloon rose slowly with the naked eye.

This time, it's much more stable. It's not like the last time. Chumo and others seem to be used to all this. They don't roar. They just sit in the basket in a daze.

The hot air balloon flew higher and higher, slowly passed through the clouds, and finally stopped in the air after about a incense burning time.

Chumo and others sit in the hot-air balloon and snuggle up to each other. Their eyes are loose, as if everything outside has nothing to do with them.

On the ground, Zhang Feng held his head high, glanced at Ma Zhou and others from time to time, and said, "remember, sealed with wax water, the hot-air balloon is obviously much more stable, there is no sloshing, and there should be no air leakage."

The two of them made a sound and began to write in the book.

This experiment is very important to them. It not only solves the importance of air leakage, but also stabilizes a lot. It is undoubtedly a great progress.

However, they soon remembered other problems.

Just now, the iron bull came down because of air leakage. Now this defect has been solved by his mentor. How can these guys come down now?

The air in the hot-air balloon is sealed. As long as the air is not exhausted, it is difficult for them to come down.

Thinking, Hao Chujun hurriedly asked, "mentor, wait a minute, brother Tieniu, how do they get down?"

How do you get down?

Zhang Feng frowned.

He suspected that this guy had been stupid in reading. Didn't he come down just now and can't come down now?

He replied angrily, "how did you get down just now? How do you get down now? Are you stupid?"

"Teacher, have you forgotten?"

As soon as Hao Chujun's face changed, he hurriedly reminded: "brother Tieniu and others came down just now because of air leakage. Now you have blocked this defect. How can they come down now?"

Zhang Feng was stunned.

Hao Chujun's words reminded him.

Yes, I have stopped this disadvantage.

As long as the gas in it is not exhausted, it will be difficult for these guys to come down unless

He glanced at them and hurriedly said, "did you prepare sandbags and other heavy objects on the hot-air balloon just now?"

The rise and fall of a hot-air balloon is related to the temperature in the sphere. When the temperature in the sphere is high, the gravity of the balloon decreases. When it is less than the buoyancy, the balloon rises, the air temperature in the sphere decreases, and the buoyancy generated by the sphere is less than the weight and load of the sphere, and the balloon begins to decline.

However, this method can not be used in the hot-air balloon developed now.

Therefore, we can only rely on heavy objects, such as sandbags and so on.

Because the wind direction is different at different heights, the air flow is also different. If you want to rise, throw down the weight carried by the hot-air balloon. With the wind direction of the air flow, you will change the direction and height.