After all, anyone who has cooked knows that when you use an induction cooker, even if there is no flame at all, as long as the oil temperature in the pot is too high, it will spontaneously ignite.
Even if Handu uses iron cans, it is impossible to completely seal the iron cans. Even if the oil is refining, it will not be sealed. Therefore, as long as the temperature is too high, an explosion will definitely occur.
So, if the temperature inside the iron can is too high, is there any way to cool it down? Of course there is, that is to continue to add hot oil into it to cool down. This principle is like boiling water. If the water temperature is 100 degrees, it will boil.
, then in order to control the water from boiling, you can only add cold water to it regularly, so that the temperature inside the iron can can be maintained within a certain range.
In addition, the gasoline refined in this way is unstable and has a low ignition point. It is easy to spontaneously ignite if exposed to the scorching sun.
Of course, this is an advantage for Handu. Because this kind of gasoline has a relatively high combustion value, and if you want to fly a hot air balloon, of course, the higher the combustion value, the better.
Tao Chengdao's disciples are all good at making various utensils. They can even make cannons, so a big iron bucket is no problem.
At Han Du's request, it only took them two days to prepare what Han Du needed.
Place the iron pot of distilled fire oil on the stove, and two thick copper pipes are connected to the top of the pot. Pour the fire oil into the pot and start a fire below.
For the sake of safety, Han Du repeatedly asked everyone to heat the oil slowly over a low fire. Heating over a low fire was also a way to avoid explosions, but in this way, the oil refining speed would definitely not be faster.
But Han Du was not in a hurry anyway, safety was the most important thing. Anyway, it didn’t require much fuel, so Tao Chengdao’s disciples could just practice slowly.
Han Du found Tao Chengdao, pointed at the huge oil lamp and said, "This one won't work either. It needs to be replaced."
Tao Chengdao didn't hesitate at all. As long as he could see Feitian with his own eyes, he didn't care about anything. "You can do whatever you want. If you need anything, whether it's people or things, just tell me."
Now that he has said this, Han Du naturally has nothing to be polite about.
However, after remaking an oil lamp, Han Du was not satisfied, so he simply called in Sun Xian and others from the academy.
Sun Xian's steam engine has been basically completed, and now he is awkwardly waiting for the rubber in Han Du's mouth to come back. Before the rubber comes back, there is very little he can continue to do.
So, after hearing Han Du's call, Sun Xian came without hesitation with several students.
Han Du introduced Sun Xian and Tao Chengdao to each other: "This is the emperor's personal title of Wanhu, named Tao Chengdao, Marquis, the first person to make firearms in the Ming Dynasty. This is Mr. Sun Xian from the academy, who is the first person to make firearms in the academy."
The leader of the world, it was he who led a group of students to build the steam engine."
"I entered Sun Xian at the end of my studies and paid homage to the Marquis. I have heard of Wanhu for a long time, and I am honored to meet him today. I have also heard of the various firearms made by Wanhu for a long time." Sun Xian was young and his status was not as good as that of Tao.
Tao Chengdao, so after Han Du introduced him, he quickly took the initiative to greet Tao Chengdao.
Tao Chengdao smiled and nodded, waved his hands, and said nonchalantly: "Why don't you say that the Marquis is not a Marquis? The old man doesn't care about these false courtesy. I heard that you are Han Du's disciple, so I will make you worry a lot this time."
Han Du also smiled and said to Sun Xian: "Well, Wanhu has such a temper. Since Wanhu doesn't agree, then you can also call Wanhu from now on."
When Sun Xian saw that Tao Chengdao did not refuse, he smiled and said, "Wanhu is so polite. It is my honor to be able to contribute to Wanhu."
After seeing it, without any delay, Han Du and Tao Chengdao took Sun Xian to the huge oil lamp.
After Han Du carefully explained to Sun Xian what he needed, he also told him about the oil lamp problem, hoping that he could think of a solution.
Sun Xian is indeed addicted to machinery. After hearing what Han Du said, he did not say anything. Instead, he looked around the oil lamp first and then said: "Sir, the student thought that if it is according to the needs of sir,
We don't have to make it a lamp."
Han Du's eyes suddenly lit up when he heard this, and he thought of something, but he was vaguely unclear. He quickly asked: "What do you think?
Fa, tell me quickly."
According to Sun Xian, since the refined oil is so easy to burn, it is better not to even use the wick. Just get a spout and put a pressure on the oil in the pot, and the oil can be sprayed out from the spout.
As for how to apply pressure, isn't that simple? Just make a piston structure of a steam engine. And Sun Xian can also make a winch that can continuously apply pressure to the oil.
"Okay, good idea." Tao Chengdao was the happiest, and looked at Sun Xian with admiration. He was indeed the person Han Du specially found. Although he was about the same age as his apprentices, in just these two moments,
Much better than his apprentice.
Han Du also nodded in agreement.
Since both Han Du and Tao Chengdao agreed, Sun Xian could just do what he said. He even built a steam engine, so it was a piece of cake for Sun Xian to build such a thing.
After the fire-breathing tool was built, Tao Chengdao's apprentice also refined two barrels of oil.
Put the oil into the watering can and everything is ready. In order to prevent the hot-air balloon from igniting the flames, Handu specially built two wooden stands, opened the openings of the hot-air balloon, and spread the entire hot-air balloon on the stands.
.
The moment that made Tao Chengdao extremely excited came. He refused to listen to Han Du's repeated dissuasion and insisted on lighting the hot air balloon with a torch. As his apprentice began to turn the winch, a stream of turbid oil came from
The water came straight out of the watering can and ignited instantly as soon as it came into contact with the flame.
The flames soared four to five feet high, making a roaring scream. Most of the huge heat was directed towards the opening of the hot air balloon above. But even a little bit of it was radiated to the surroundings, making the apprentice who was turning the winch feel waves of heat.
Attack.
The shriveled hot air balloon quickly inflated, and then naturally broke away from the frame and flew into the air. If there were no ropes that tightly tied the hot air balloon to the wooden frame, everyone could see that it would fly away.
"Okay, it's done, it's done~" Tao Chengdao was as happy as a child.
However, Han Du stretched out his hand to signal him to calm down, and said with a smile: "Wanhu, it's too early to tell. We still have to see how powerful this thing is and whether it can bring people along."
Go to heaven."
"Yes, yes, yes, let's take a look." Tao Chengdao immediately raised his head and shouted to the apprentices standing on the wooden frames on both sides: "Try to see how strong this thing is."
The two apprentices immediately pulled the rope hard with both hands. Even Han Du, who was standing below, could see that the hot air balloon was obviously pulled down.
Obviously, this strength is not enough. Han Du shook his head and said to the person who controlled the firepower: "Go on, increase the firepower."
As the winch rotates, greater pressure acts on the oil in the pot, more oil spurts out, and the roar of the flames becomes louder.
The hot air balloon quickly inflated to its limit. At this time, the two people on the wooden frame could no longer pull the rope. Even if their feet were off the ground, they could not pull the hot air balloon down at all.
If the rope was not tied to the wooden frame, there would be no doubt that the two people would be dragged directly into the sky.
"Okay, okay, stop." Han Du shouted repeatedly towards the person in charge of the firepower.
The man immediately moved the winch back in the opposite direction, and the flames immediately shrank back and extinguished in an instant.
Without the source of heat, the hot air balloon also began to fall, slowly becoming dry again.
Seeing Tao Chengdao's face beaming with joy, Han Du said: "This experiment proves that our idea is right. But the hot air balloon you made, Wanhu, has many problems and needs to be improved."
"Ah? Still need to change? Aren't they already flying? Let's tie both the man and the watering can to the rope, can't we fly into the sky?" Obviously, Tao Chengdao still couldn't forget about flying. What was he thinking about?
He could realize his wish to fly into the sky as soon as possible, and he didn't care about anything else. He even expressed his idea of tying people and watering cans to ropes.
Han Du shook his head and said: "Wanhu, this
After waiting for so long, I am no longer in a hurry. It is definitely not possible to tie people and watering cans to ropes. I think I should put a basket underneath, where people can sit, watering cans can be placed, and things can be carried.
.And the current hot air balloon is definitely not good. The force distribution of the rope alone is unreasonable and needs to continue to be improved."
Sun Xian also discovered this problem, and when Han Du said it, he nodded frequently.
"It still needs to be changed? When will it be changed?" Tao Chengdao was a little unhappy. He felt that Han Du was delaying his flight.
Han Du looked at Tao Chengdao with a smile and said: "Don't worry Wanhu, it won't take long. However, even if the hot air balloon is modified, Wanhu can't even think of going up in person."
"How can this be done? I've been waiting for this day for I don't know how many years. Why don't you just say no?" Tao Cheng could rely on Han Du to say goodbye, but this was the only thing he would never agree to.
He had tried almost every possible means to fly to the sky, how could Han Du stop him with just one word?
Han Du patiently explained to Tao Chengdao: "After all, this is the first time this thing has been made. No one knows what problems there are. What should you do if something happens to you when you go up there?"
"What could happen to this thing?" Tao Chengdao originally wanted to refute Han Du, but under Han Du's burning eyes, his voice became smaller and smaller.
After all, he was almost blown to pieces not long ago. If Han Du hadn't stopped him in time, he might have been buried in the ground by now. Therefore, in front of Han Du, he would still be short of breath in this regard.
Han Du saw that Tao Chengdao was so persistent and was too lazy to say anything to him. He immediately raised his head and shouted at his disciples: "Watch your master."
Two disciples, one on the left and one on the right, immediately stepped forward and stood beside Tao Chengdao. Their posture was obviously to guard him tightly. No matter what, they would never allow Tao Chengdao to find a chance to go up.
After Han Du saw it, he smiled and said: "Wanhu doesn't need to think about it. I will put it in the academy for the first time to fly. Moreover, for this grand event of the first flying to the sky in thousands of years, Wanhu will always let the emperor
Want to see it with your own eyes?"
After hearing this, Tao Chengdao sighed after thinking about it for a moment. Han Du was right. He had to ask the emperor to observe him for the first time in flying. Tao Chengdao also knew the benefits of doing so.
Since the emperor is here, this first opportunity to fly into the sky will definitely not be his turn. When the emperor is present, how could he have the opportunity to fly into the sky if he is not accompanying him in front of him.
Just before the popularity of Broom Star among the people had passed, another news spread.
"Hey, have you heard? The academy will hold a flying event in half a month."
"I haven't heard of it, but what are you talking about flying into the sky? Are people flying into the sky? People are not birds, how can they fly into the sky?"
"Who knows? But since the news came from the academy, it shouldn't be false."
"That's true, but maybe you heard it wrong?
"Oh, no matter what is going on, we will find out if we go and see it in half a month?"
"That's true"
"Go together, go together"
Fengtian Temple.
"What? Feitian!" Lao Zhu looked at Han Du blankly, his eyes widening.
Although Lao Zhu didn't witness the last time Tao Chengdao flew into the sky, he heard that Zhu Biao came back to report it. He heard that if Han Du hadn't replaced Tao Chengdao with a fat sheep, Tao Chengdao would have fallen long ago.
His body was shattered into pieces. At that time, Lao Zhu also believed that flying to the sky was impossible.
But just a short time later, Han Du came to tell him that he had found a way to fly into the sky and wanted to invite him to watch the ceremony. Even Lao Zhu couldn't react to this at the moment.
"Yes." Han Du nodded and replied with a chuckle.
After Lao Zhu pondered for a while, he asked doubtfully: "But isn't this Feitian bad? The last time Tao Chengdao Feitian exploded?"
Han Du then explained: "The emperor is unaware of something. I and Wanhu have found another way to fly into the sky. This time there should be no problem."
Since there is no problem, Lao Zhu is naturally very excited. If he can really see the feat of flying with his own eyes, then he will really have no regrets. He has personally experienced things that many capable people in the past dynasties have longed for but cannot achieve.
What's there to regret?
"Okay, I will go there in person when the time comes. Where are you going to fly?" Lao Zhu nodded and agreed to Han Du, and then asked again.
Han Du replied: "In the academy."
"Academy?" Unexpectedly, after hearing this, Lao Zhu frowned, as if he had some objections to Han Du's answer.
"Your Majesty? Is there anything wrong?" Seeing this, Han Du quickly asked cautiously.
After Lao Zhu paused for a moment, he frowned tightly and said, "Although your academy is not small, it is in the capital after all. What if it explodes like last time?"
Of course, Han Du felt that the possibility of an explosion was very small, but he was actually not completely sure. So he asked in a low voice: "What does the emperor mean?"
"Let's put it in the university grounds. Even an explosion will have no impact. Besides, the place is big enough. It's good for the people to see such a grand event." Lao Zhu's tone did not allow Han Du to refute.
The Grand Campus is the headquarters of the Fifth Army, just east of the capital. If the army is moved away, it will indeed be a vast and flat land.
Since Lao Zhudu had made such a decision, Han Du said nothing, bowed and said: "I obey the decree."
Half a month passed very quickly, but for the people in the capital, they felt that it was like a year. They were looking forward to it every day, and they waited more than a dozen times before they finally got to witness the legendary flying scene.
The campus grounds had long been cleared and vacated. A high platform had also been built in the campus grounds. The soldiers were wearing armor and holding sabers in their hands, blocking the common people about ten feet away from each other.
A huge hot air balloon is placed in the middle. This hot air balloon is obviously much better than the one made by Tao Chengdao. Not only is it round and a real sphere, but it also has much more ropes than the one made by Tao Chengdao. The rope is
They are interlaced and connected to form a network, and they are densely sewn on the hot air balloon so that the position of the rope will not change when the hot air balloon inflates.
All the officials took their seats on the high platform, and Lao Zhu finally arrived.
"I pay my respects to the emperor. Long live my emperor. Long live the emperor."
As soon as Lao Zhu arrived, both the courtiers and the soldiers and civilians on the campus immediately erupted into shouts of "Long Live the Mountain" like a tsunami.
"Everyone loves you for your peace of mind."
"Thank you, Your Majesty"
After all the officials stood up, Lao Zhu said to Han Du: "Let's start."
Han Du immediately stood up, bowed and replied: "I obey the order."
After saying that, Han Du walked straight towards the hot air balloon.
Although it has been experimented once, it is also very dangerous to board a hot air balloon rashly. However, other people do not understand this hot air balloon even more. If they were to go up in it, there would be no danger. Without knowing anything, they might even
This Feitian thing is messed up.
Therefore, Han Du thought about it and decided to go up in person. And he didn't need to fly very high, as long as he could prove that this thing could fly, there would be no danger.
Watching Han Du step into the basket, the bottom of the basket is a sandbag used to increase the weight.
Seeing Han Du walking into the basket, Lao Zhu couldn't help but frown. Of course he didn't want Han Du to take risks, but he also thought that Han Du had said that this thing was not dangerous, and he knew that Han Du never did anything he was unsure of.
, so he didn’t speak.
When everyone saw Han Du's actions, they didn't decide anything.
But Tao Chengdao suddenly couldn't sit still and immediately stood up and ran over quickly.
When Han Du saw Tao Chengdao coming, he immediately asked: "Wanhu, what are you doing here?"
Tao Chengdao ignored Han Du's obstruction and dug into the basket, saying, "You can't stop me. I've been waiting for this day for I don't know how many years."
Han Du tried his best to stop Tao Chengdao, and said quickly: "Wanhu, this may be dangerous, how about you let me try it first, and then you come back?"