It is actually very simple to invent the fan at this stage.

For example, the simplest one is a mechanical fan.

Propellers have been tested in shipyards for a long time, because there was no rubber before, so sealing was a problem.

Of course, now, this is not the problem here, but the propeller is rotating. Turning the appropriate fan blades up, isn’t it a fan when it rotates!

In addition, electric fans can also be used. It is also a simple thing for today's Ming Dynasty.

In the final analysis, there is still a stable power, no matter how powerful it is, the result of applying this power.

He did it as soon as he said that, and Zhang Mingwei immediately asked them to build fan blades at the steam engine factory. He also gave some guidance on what they looked like, and it was just like three leaves.

It took only two days to make a large fan, hang on the roof and rotate, blew a lot of wind.

This wind is naturally not a cold wind, but because the craftsmen are sweating, the wind can reach the coolness when it blows.

When Emperor Chongzhen heard this, he immediately issued an order to install a fan in the palace.

It’s not that the palace is too hot and the fans are urgently needed, but that this is a new thing and a trend.

In response, Zhang Mingwei shook his head. If he installed a mechanical fan in the palace, it would be too noisy. What should the senior officials of the Ming Dynasty do?

Therefore, he used it for five or six days and took the craftsman to make an electric fan, and the sound was gone.

Naturally, the Ming Dynasty may have set up another money-making company.

Emperor Chongzhen looked at the fan rotating above his head and said happily: "The wind blew from the ground, hehe, I have cracked another magical power that is only available in mythology!"

"..." Zhang Mingwei was speechless when he heard this, and he could think of it.

So he pointed to the rotating electric fan and immediately smiled at Emperor Chongzhen and said, "Your Majesty, this can actually crack another most ordinary and most desirable magical power in the myth!"

When Emperor Chongzhen heard this, he was surprised. Then he was overjoyed and asked quickly: "Sir, what is it? Come on!"

At this time, only the eunuch of the Sili Supervisor Wang Chengen was by his side. He was also curious and stared at Zhang Mingwei, feeling a little emotional, saying that there are too many things in this later generation, too powerful, right?

Zhang Mingwei said to Emperor Chongzhen: "This fan changes direction. The wind blows upwards and generates buoyancy, which can bring people to heaven. In other words, people can use this thing to fly in heaven."

When Emperor Chongzhen heard this, he was shocked on the spot.

The dream of flying in the sky can be said to be that everyone yearns for. Therefore, humans imagined gods and immortals, and one of the most basic skills is to be able to fly.

At this time in the Ming Dynasty, there was a man named Wanhu who worked hard to find a way to launch a rocket, tied it to a stool and carried it to the sky. As a result, the pandas in the panda were not as long as they were, and they paid the price of their lives!

Before, Emperor Chongzhen heard Zhang Mingwei imagine that humans could fly in the sky with the help of tools. He even saw planes in that documentary.

However, he only saw the plane and knew that it could fly; but now, when Emperor Chongzhen heard Zhang Mingwei use the fan, or the ceiling fan, he suddenly felt that he was close to him, and immediately asked ecstatically: "Can you really fly?"

Seeing that he was so excited, Zhang Mingwei had to tell the truth and poured cold water on it: "It's OK in theory, but in reality, it's not possible at the moment."

As he said that, he pointed to the ceiling fan and said, "This must rotate fast enough and the buoyancy caused is large enough. The steam engine that can continuously provide power is too bulky. It is impossible to generate enough buoyancy with the power of the steam engine. New power must be used to make this possible."

When Emperor Chongzhen heard this, he couldn't help but sigh and said, "Sure enough, flying in the sky is not that easy!"

Seeing him so disappointed, Zhang Mingwei had to comfort him again, "But if you just want to go up to heaven and see it, it is actually easy. Didn't we just have rubber? We can make a huge Kongming lantern and take people to heaven to see the scenery."

"Yes!" Emperor Chongzhen was overjoyed when he heard this, and nodded and said, "The Kongming lantern can fly in the sky. There will definitely be no problem with the huge Kongming lantern, right?"

Speaking of this, he looked at Zhang Mingwei and asked with anticipation: "How about making one?"

After hearing this, Zhang Mingwei immediately smiled and said to Emperor Chongzhen: "Your Majesty, these rubber resources are very precious now. I originally thought of using the blade, and even embezzling a little more to make rubber gloves, etc., and preparing for chemistry to make a large-scale replacement of the Ming Dynasty's ordnance. Which one does Your Majesty want?"

"..." Emperor Chongzhen was stunned when he heard this.

Wang Chengen was also similar, a little dumbfounded, feeling that there were countless good things that could emerge from Duke Xingguo.

After coming back to his senses, Emperor Chongzhen immediately asked Zhang Mingwei excitedly with great expectations: "Sir, what is the way to change this armament in a significant replacement?"

When Zhang Mingwei heard this, he didn't piss his appetite. He replied with a smile: "Murts, cannons are rear-mounted, which is a bit similar to Fran machine cannons, but they are much better than Fran machine cannons. They do not need to replace the cannon barrels, but lead bullets are directly installed from the back. Even after this, there can be continuous fire muskets. Compared with the current weapons, they are completely in the sky and underground!"

Emperor Chongzhen's eyes glowed when he heard this, and immediately remembered the machine gun that he had seen in the documentary that kept ringing.

Seeing him like this, Zhang Mingwei smiled and said, "Aren't we worried that our military and national weapons would be learned by the Ming enemies after they were sold to Portugal? It doesn't matter. After we have this new type of military ordnance, we can still beat them even if they have learned to rifle guns and cannons!"

Upon hearing this, Emperor Chongzhen grabbed Zhang Mingwei and said, "Sir, since you can do anything good, why didn't you do it before? This thing cannot be hidden!"

"..." Zhang Mingwei was speechless when he heard this, so he had to explain to him, "Your Majesty, the so-called science and technology tree is a technology similar to a tree. It must have roots before there are leaves to bloom and bear fruit. If the technology in advance is not mature, how can we do something more powerful in the future?"

Hearing this, Emperor Chongzhen felt a little embarrassed and asked Zhang Mingwei: "Is that OK now?"

"Well, you can almost try to start doing it." Zhang Mingwei nodded and said, "But it is not simple. Many links need to be tested. It will take a long time to actually make it work. Therefore, the original guns and the like should be used. When the time is almost the same in the future, the original guns and cannons cannons can be sold to vassal states."

It is absolutely OK to not waste it when you hear it. Emperor Chongzhen nodded immediately and said, "Sir, you are right. You can do whatever you want, and you can do whatever you need to allocate manpower and material resources, even if you speak!"

He threw all the huge Kongming lanterns behind him when it came to the back of his mind when it came to the military and national power.

What Zhang Mingwei refers to is preparing to invent white gunpowder, that is, thunder mercury. This is not easy to do, and there are a series of prerequisite requirements.

In later generations, when he wrote historical time travel novels, he checked how to click on this technology tree. Therefore, in theory, he knew how to do it, but in fact he didn't try it, so he told Emperor Chongzhen that it took a long time, and the original guns would continue to be used.

Fire cotton, also known as gunpowder cotton, is scientifically called nitrocellulose. Its explosive power is 2 to 3 times greater than black gunpowder, has stable combustion and better ballistic energy. Moreover, its combustion is very complete and there will be no problem of carbon deposits on the barrel.

In addition, the fire foam burns without moisture and only has a faint white smoke, so it is a type of smokeless fire powder.

In fact, this is the earliest smokeless gunpowder.

In the process of making fire cotton, rubber gloves are required, and a fan is required. In the later stage, a thermometer is required to control the temperature to obtain ether, etc.

After a series of operations, the final white powder, commonly known as white gunpowder, can be obtained.

The characteristics of white gunpowder are relatively low temperatures and have low requirements for the barrel, but their power is three times that of black gunpowder. Therefore, the dosage can be reduced, which is of great benefit to reducing the weight of infantry and saving the dosage of nitric acid and gunpowder.

In addition, the combustion speed of white gunpowder is higher than that of black gunpowder, so it can provide a higher initial muzzle velocity, which means that the mass and caliber of the bullet can be reduced, and the weight of the bullet can be further reduced.

Another great advantage is that compared with the black gunpowder that produces sulfides after combustion, the white gunpowder is completely burned and there will be no residue. Therefore, the barrel life can be greatly improved and the rifle wear will be less.

In terms of military industry, the danger is too high, so we can only do it step by step.

When the white gunpowder is made, other things such as copper fire hat impacting fuses, firing needles and guns, and filling bullets are just craftsmanship issues, and relatively speaking, they are much simpler.

As for nitrifying glycerin, that one is too dangerous. Zhang Mingwei doesn't want to die young, nor does he want the few talents to play with this now. Let's put it aside for the time being.

Of course, there are also more stable TnT, which is yellow gunpowder. This involves the recycling and refining of benzene. At present, it is not realistic, so let it go first.

In this way, what Zhang Mingwei had to do was to invent white gunpowder first and let the Ming Dynasty's military industry take a big step forward.

But even so, he probably couldn't be busy. After all, his energy could not be just focused on this aspect. Instead, the use of rubber would cost most of his energy.
Chapter completed!