Yuan Tiangang arrived at Jingyang Academy one night later, and Xia Hongsheng took him to meet the music stage. According to the drawings provided by Xia Hongsheng, Letai already had a preliminary idea, and after talking to Xia Hongsheng, Xia Hongsheng also felt that it was feasible, so Yuan Tiangang ordered the Taoist boy he brought to buy and collect the things he needed. Prepare to make the first sample to experiment.

There is an unavoidable issue here, and that is fuel.

At present, the most effective fuel is the fine coal powder made by Xia Hongsheng's coal yard for smelting furnaces or other firing things, which burns the most fully and has the largest heat.

But not to mention that the pulverized coal is quite heavy, it is used on the hot air balloon, and it cannot be said that it is no longer cared after it is filled and burned all at once. Instead, it is necessary to keep adding pulverized coal to keep it burning, provide heat, and promote hot air to enter the hot air balloon to provide upward power. Therefore, there needs to be a combustion furnace under the hot air balloon, and there needs to be a lot of pulverized coal for continuous addition of pulverized coal to maintain combustion after rising. This greatly increases the weight of the basket under the hot air balloon.

It's an endless loop.

When a hot air balloon flies, it needs to burn pulverized coal to provide heat, and it needs to carry a large amount of pulverized coal in a gondola to keep it burning. Carrying a large amount of pulverized coal, which increases the weight of the hanging basket and requires more thermal energy, and in order to obtain greater thermal energy, more pulverized coal is required......

The advantage of using pulverized coal instead of an open flame is that, firstly, it is the fuel that can provide the most heat at this stage, secondly, it will not burn the ball skin of the hot air balloon, and thirdly, it is easier to carry out windproof treatment.

There is no solution to this problem for the time being. You can only make one first, fill the ground with coal dust and burn it, so that it can lift into the air and gradually fall as the coal dust is less. Let's verify the feasibility first.

There are also spherical materials, nylon, polyester and other materials are now inevitable, only cloth. Not light enough, not strong enough, not tight enough to breathe.

Xia Hongsheng could only adopt the earliest method of hot air balloons, made of pasted paper, the seams of the cloth were buttoned with buttons, and then coated with a layer of wax or fish glue for sealing. This will reduce the altitude of the balloon's rise, but there is no better alternative.

Yuan Tiangang really didn't build it, and it only took two days to prepare all the required materials. More than a dozen carriages loaded with things were transported to Jingyang Academy, which also attracted onlookers from the students of the academy.

"Hey, have you heard, it is said that the mountain chief and Mr. Le are going to make a big object together!"

"Isn't this nonsense, anyone can tell that the mountain chief is going to do something!"

"Do you know what the mountain chief is going to do?" Another student smiled mysteriously: "At that time, I saw so many carriages pulling things in, so I took the initiative to go over to help, and listened to a few ears by the way, as if I was going to make a hot ball, but I don't know what it is, have you heard of it?" ”

A group of students talked about it, and many people ran over to watch it every day.

Xia Hongsheng enclosed the hot air balloon field, but it was not blocked, allowing the students to gather outside to watch—they couldn't read it anyway......

"Hey, Brother Zitai, you are a protégé of the mountain chief, do you know the inside story?" Someone asked Wang Zitai, that is, Li Tai.

Li Tai shook his head expressionlessly and said, "I don't know." ”

However, there was an incomparable frenzy in his eyes, staring closely at the busy music stage and others inside.

What do you know?

What is this, how can you guess it, and how can you guess it?

This is something that can make mortals fly into the sky just like the legendary immortals!

It's a fairy thing!

This is the immortal magic weapon that my master and the immortal man brought to you!

Li Tai had seen the drawings of a hot air balloon in Xia Hongsheng's study. The shape and structure of the object is becoming more and more like what is on the drawing.

Li Tai still clearly remembers that when he asked Xia Hongsheng what this was in Xia Hongsheng's study, Xia Hongsheng replied lightly.

"Oh, it's called a hot air balloon, and it's used to fly people into the sky."

Xia Hongsheng stood up from the pile of wooden shelves, looked at the objects in his hand, and couldn't help but sigh in his heart at the depth of the Mo family's attainments in the organs. It can be said that in terms of manufacturing machinery, the level of the Mo family is almost the same as that of the military aircraft workshop. However, the most advanced tools are used in the military aircraft workshop, using Xia Hongsheng to formulate miniature weights and measures, accurate to millimeters of measurement units and accurate to gram weight units, using various supporting tools provided by Xia Hongsheng. These are the secret weapons that have enabled the military aircraft workshop to produce various artifacts that are far ahead of the current world technology. As for Letai and others, they rely on their own experience and some of their own unique tools.

If Letai and others can combine the standardized manufacturing tools and experience of the Military Machinery Workshop with their own existing Mojia manufacturing experience and knowledge, then Datang's manufacturing process will be greatly improved.

Xia Hongsheng looked at Letai and the others who were busy there, and then looked at the hot air balloon whose skeleton was almost formed, and secretly had an idea in his heart. Why don't you use the hot air balloon as an opportunity to fill Letai and others into the military aircraft workshop as consultants for the military aircraft workshop?

"Mr. Le, although I know that the Mo family is especially good at the art of mechanism manufacturing, but I have seen it with my own eyes in the past few days, but it is a different feeling." Xia Hongsheng said to the music stage: "The Mo family's tricks are really exquisite and ingenious, which is amazing. ”

Letai raised his head, wiped the sweat on his forehead, shook his head and sighed, and said: "In a certain opinion, it is one thing to come up with a thing, it is one thing to make this thing possible, and it is another thing to make this thing. For example, this hot air balloon, Xia Hou can design this kind of thing, and make this thing can be made in a real way, this is the most powerful. In contrast, even without me and a few others, Xiahou could still make this thing. My Mojia technique, without the first two, is at best just a group of craftsmen with good skills. This is to make a certain have to admire Xiahou's character, if this thing is made, it can really carry people to the sky to travel proudly, then it is really a shocking invention, at that time, the name of Xiahou, together with the way of Gewu, will be famous all over the world. ”

"Mr. Le is overrated, the effect of this thing seems to be miraculous, but in fact, the principle behind it is very simple. If you know this principle, anyone can make it if you try it a few times. Xia Hongsheng said to the music stage: "This is the magic of Gewu. Everything in the world, all kinds of phenomena, have their own laws behind them, and if you master these laws, you will master these phenomena, and if others don't understand them, they will feel like gods. Isn't our Jingyang Academy just to let the world know those laws? ”

"Xiahou's mind ......" Letai smiled bitterly and said: "If my Mo family could have such a mind as Xiahou before, I am afraid that I will not end up like this now." ”

"Mr. Le doesn't need to be annoyed, the Mo family and the way of Gewu complement each other, especially the Mohist post-learning, which is almost equivalent to Gewu. I believe that with the opening of the academy, the technology of the Mo family will not decline anymore. Xia Hongsheng said.

While the two were talking, they suddenly heard someone outside shouting for the mountain chief, Xia Hongsheng looked back, but saw that it was the doorman of the academy.

Xia Hongsheng recruited him and asked him to come over, and the man crossed the fence and went to Xia Hongsheng, and said: "Qiqi Mountain Chief, the palace has sent someone to say that His Majesty has summoned the Mountain Chief to meet him immediately, with the fastest speed!" ”

Xia Hongsheng was stunned for a moment, and immediately realized that something had happened. (To be continued.) )