After breakfast in the cafeteria, everyone has to prepare for class if they have a class, and they have to prepare for class if they don't, or do other things.

"Mountain Chief, please stay!" Letai stopped Xia Hongsheng after everyone said goodbye.

Xia Hongsheng stopped, and the music platform stepped forward and said to Xia Hongsheng: "I was going to go to the mountain chief today, but the hot air balloon has been completed, and I am waiting for the mountain chief to go to check it, give it a try!" ”

"It's done?!" Xia Hongsheng was shocked in his heart: "So fast! ”

Xia Hongsheng immediately walked to the back of the music stage, and when the two arrived at the place where the hot air balloon was made, they saw the huge ball skin spread out on the ground from a distance.

"According to the drawings of the mountain chief, this thing was finally made, and it lived up to the high expectations of the mountain chief." The music platform was very pleased and said: "It's just that the structure on the mountain chief's drawings is very exquisite, and some places can't be done, so the music platform has to change it according to his own ideas." Mountain chief, please! ”

Letai went in with Xia Hongsheng and said one by one: "Ball skin, the mountain chief's requirement is to be both light and able to gather qi without leakage, so after discussing with Yuan Daochang, the cloth is first soaked in boiled fish gelatin, and after these cloths are full of fish gelatin, then unfold it while it is hot to prevent it from sticking together, and then soak these not thin soaked in fish gelatin into the wax, and lock the fish gelatin on the cloth." To prevent the wax from melting after the heat rises, wrap a thin layer of cloth on the outside. Come to think of it, this time the cloth will not leak, and it will not be sink. ”

The two went forward together, and Xia Hongsheng saw that the ball skin was connected to a wooden box through a rope, to be exact, it should be a small wooden house.

Xia Hongsheng was puzzled, it should be a wooden frame.

I only heard the music stage say: "This is what I made my own decision and added." This thing is going to fly into the sky, and what a wind! I'm going to blow people up with a headache! Will it blow out the fire? So I took it upon myself to put everything in this wooden house. Come and see! ”

The music stage was very excited and took Xia Hongsheng to the cabin, it was really a small wooden house, so that after the music stage entered, it was only two fingers wide from the roof. However, Xia Hongsheng was very surprised that although the sparrow was small, it had all kinds of organs.

The cabin was still an ensuite, one on the outside, and another with a door open.

The outside room can only accommodate two people to sit down, and if you squeeze it, it can also accommodate three people. This one is equipped with chairs, and Xia Hongsheng gave a thumbs up to the ideas of the music stage and others. The chair was a wooden board attached to the wall that could be put down, and when it was lowered, it became a chair for people to sit on. If you feel that it takes up space, you can lift it up and stick it against the wall.

Seeing that Xia Hongsheng was flipping the chair, the music stage smiled, walked over, put down the wooden planks on the walls on both sides, and turned them into two seats facing each other. I saw that the orchestra platform smiled and bent down to lift it down, and unexpectedly lifted a wooden board from the middle, and the thin wooden sticks like mazaars that crossed below were lifted up and pulled by the orchestra below, stuck there, and became a table. Xia Hongsheng noticed that although the plank was as thick as the other planks on the ground, it was divided into two layers. In this way, the floor is still flat when put together, but when it is lifted, it becomes a small table.

"Hahaha! Good! Xia Hongsheng said with a smile.

The two of them went into the small gate again, and the small door was much larger on this side than on the other side.

The orchestra made a stove-like thing inside, and a copper pipe on top of it sticked out like a chimney. Next to it is a piece separated by a wooden plank.

"That's where the hot air balloon is controlled." Letai said to Xia Hongsheng: "Put pulverized coal in this wooden pool, put the pulverized coal into the furnace and burn it, and the hot gas will flow into the outer ball skin along this copper pipe. That way, the heat won't run anywhere else. Yamacho was relieved that the original structure had not been changed from the outside, and the heat was still being discharged under the skin. In addition, the back mouth of this furnace is usually covered by iron sheets, just pull this handle, the iron sheet will open the gap, can be inlet air, but also can make the slag fly out through this hole, blown away by the wind. The coal dust burned and the slag burned out are also fly ashes, so it will not fall and hit people. Sandbags are also stored here. In addition, the mountain is long, and I see it here. ”

Xia Hongsheng looked in the direction pointed by the orchestra, but saw that there were still a few ladders on the wooden wall.

"The ladder can go up to the top, with the roof as the bottom, and a fence around it, just like the original basket." Letai introduced Xia Hongsheng.

Xia Hongsheng immediately sent up the ladder, opened the wooden door above, and sure enough, he saw that it was like a basket under a hot air balloon. In this way, it looks like a small cabin under the basket of a hot air balloon.

"What does the mountain chief think?" The music platform also came up, came to Xia Hongsheng's side, and asked with a little pride in his tone.

"Sir's ability is really ingenious." Xia Hongsheng looked around, nodded and said, and then asked: "However, relying on heat to rise, after all, it is slower and less powerful." There's a room hanging down here, and I don't know if I can fly. ”

"It should be possible." Letai thought for a while and said, "At the beginning, the mountain chief said that the bigger the ball skin, the greater the load of the hot air balloon. Therefore, in order to be able to move this small house, on the one hand, in addition to making the cabin as small as possible out of balsa wood, and making the house very small, on the other hand, the ball skin was also made much bigger. ”

After thinking about it, Xia Hongsheng nodded and said, "In this case, let's try it." Mr. Le, the first test flight is absolutely unacceptable, and this hot air balloon is a dangerous thing, and it is normal if it fails once. If this thing fails to lift off, or if it burns, falls, or shatters after liftoff, it is normal, and I hope Mr. Le should not take it too seriously, even if it fails, let's sum up experience, learn lessons, and start over. ”

Letai nodded and said with a smile: "Don't worry, the mountain chief is provincial." When the Mo family is doing tricks, if they want to make a mechanism, they have to fail countless times to succeed little by little. ”

"That's good!" Xia Hongsheng nodded: "It's windy today, and it's not very suitable for hot air balloon flight." I'll have them all ready, and when the weather is right for the next few days, I'll take a test flight! ”

The best time of the day is when the sun has just risen or an hour or two before the sun goes down is the best time for a hot air balloon flight.

Because the wind is usually calm at this time, and the airflow is also stable. High winds and fog are not conducive to the flight of hot air balloons.

If you want to fly a hot air balloon freely, the wind speed should be less than 6 meters per second, the visibility should be greater than 1.5 kilometers, and there should be no precipitation in the flight airspace!

"Okay!" Letai rubbed his hands excitedly. (To be continued.) )