Zhu Youzhen looked at Ding Lan, his hair was messy, his face was gray, and the clothes on his body were not only ragged, but also glowing dark, obviously he hadn't washed them for a long time. Except for the stubbornness shown in his eyes, if Ding Lan is put on the street, everyone thinks that he is called Hanako.

"His Royal Highness King Xin, Ding Lan ......" Liu Yifei, the director of the Firearms Bureau, didn't understand why Zhu Youzhen was interested in Ding Lan, in the eyes of his colleagues in the Firearms Bureau, Ding Lan was a person with a not very good brain, if he didn't know that Ding Lan usually had no violent tendencies, he would have been worried about Zhu Youzhen's safety.

Zhu Youzhen interrupted his speech, he wanted to feel for himself whether Ding Lan was an idiot as others said, or a real scientific research giant. Ding Lan's image is not terrible, it may be that his obsession with rockets makes him ignore the environment of survival, and master-level scientific researchers must have such a spirit, on the contrary, it is impossible for a person who is too heavy on fame and fortune to become a master.

Zhu Youzhen remembered the portrait of Einstein in the previous textbook, which was also messy hair, and intuitively, Zhu Youzhen felt that Ding Lan and Einstein had a fight. Maybe he got into rocket research, but others didn't understand the rocket, didn't understand him, and didn't pay attention to the image, so others misunderstood him.

"Ding Lan, how is the rocket developing?"

Ding Lan also glanced at Zhu Youzhen, he shook his head lightly, didn't say anything, and his eyes that suddenly showed light quickly dimmed, returning to the realm of confusion. It seems that he is also very dissatisfied with his research and development work.

"Ding Lan, you say, can rockets really carry people to heaven?" Zhu Youzhen noticed the light flashing in Ding Lan's eyes just now, although it was only for a short moment, he still felt that Ding Lan was not an idiot, he was really obsessed with the development of rockets.

Maybe it's the contradiction between the bright prospects of rockets and the reality of their own backward development, not dealing with them well, and not having the object of communication, so that he has become an alternative in the eyes of others, if this is the case, then I have to help him a little, sometimes, helping others is to help myself, I may have to use Ding Lan's research and development work to use rockets on the battlefield.

Zhu Youzhen decided that he wanted to have a more in-depth conversation with Ding Lan.

Ding Lan's eyes looked straight at Zhu Youzhen, his lips moved a few times unconsciously, as if he had something to say, but he didn't say it after all, however, his eyes suddenly lit up, like a dim incandescent lamp, which brightened sharply due to the sudden rise in voltage.

"In my opinion, it is feasible to ascend to heaven with a manned person." Zhu Youzhen generally does not call himself the king, unless he wants to highlight his conscious identity to attack the other party, he will call him "this king", for Ding Lan, Zhu Youzhen tried to slow down his tone, maybe he is really the first scientific master of the Ming Dynasty.

"His Royal Highness Nobuyo has research on rockets?" Ding Lan finally spoke, however, his tone was full of disdain, his eyes were squinted with a little spirit, and his brows were tightly locked, he didn't believe that the young Xin Wangye's research on rockets would surpass his own.

Ding Lan is emotional, whether it is anger or joy, as long as it is not indifferent. Although Wan Hu opened up human research on rockets and stimulated mankind's passion for space exploration, he also brought the direction of rocket research into a dead end. Manned rockets are now too advanced, and many theories and supporting technologies are far from keeping up.

It is easy to ascend to the sky with a manned person, as long as a large amount of gunpowder is stored on the rocket, and a large enough thrust is generated from the ground when ignited, people can be lifted off with the rocket, the key is to return to the ground safely, the current technology cannot land safely at all, Wanhu has not solved it, it seems that Ding Lan is also worried about this matter.

Zhu Youzhen didn't have any good way, although he came from later generations, he didn't have any exploration of rockets, he only had some common sense knowledge of later generations, and his understanding of rockets was just to stay in front of the TV to watch the launch of the Long March rocket.

Ding Lan's question made Zhu Youzhen secretly ashamed, he searched his intestines and scraped his stomach, and for a while he thought of the Katyusha rocket, the V-2 rocket, and the hot air balloon, and suddenly, he had an idea.

"The manned and the rocket should be split into two parts, and I will talk about the manned ascension first." Zhu Youzhen is not hanging Ding Lan's appetite, he really just thought of it, as if human beings began to enter space, it was a hot air balloon. "It's easy to get a man into space, the key is how to return to the ground safely."

"Does Your Highness know how to return to the surface safely?" This is Ding Lan's biggest puzzle, he doesn't believe that Zhu Youzhen can solve the problems that have plagued him and his father for decades in just a few words.

"The speed of the rocket is too fast, and now there is no way to control its return, we can choose the slow one, such as a hot air balloon." Zhu Youzhen found that the confusion in Ding Lan's eyes had faded a lot, and he had to continue to play the role of a teacher that he was not very good at, "Make a big balloon out of cloth, hang a charcoal brazier underneath, light the charcoal fire in the basin, and when the hot air enters the balloon, the balloon will become lighter, so as to ascend to the sky with the charcoal brazier below." When falling, slowly and gradually extinguish the charcoal fire in the basin, the hot air in the balloon will slowly decrease, the weight of the balloon will increase, and because it increases very slowly, the balloon will also fall slowly, and the person on the balloon can safely return to the ground. ”

Ding Lan's eyes suddenly lit up, in stark contrast to the old and dirty clothes on his body, he has been studying rockets for a long time, of course, he can understand Zhu Youzhen's popular science knowledge, but he is still a little skeptical of Zhu Youzhen's statement, "Your Highness, can the balloon really bring people back to the ground safely?" ”

"Absolutely." Zhu Youzhen's words are categorical, this is a method that has been proven by later generations, and there is no need to doubt its authenticity. But I can't finish the thing, otherwise, how can I embarrass the relationship between Ding's father and son, who has been studying for decades?

Moreover, these technical tasks require a lot of time to experiment step by step, and he does not have this time, he has more important things to do, "However, you need to study how big the balloon should be, what kind of cloth to use, when the charcoal brazier will start to ignite and extinguish, and where the person will stay in the balloon." ”

Ding Lan nodded silently, a trace of firmness flashed in her bright eyes, and the wisp of stubbornness blended harmoniously. After a long time, it is estimated that he was recalling every sentence of Zhu Youzhen, and then he remembered what Zhu Youzhen said and divided it into two parts, "Your Highness, there is another piece, which is about the ...... of rockets"

It seems that Ding Lan is both happy and regretful about Zhu Youzhen's method of ascending to heaven, and is happy that after Zhu Youzhen's ignition, it is finally possible to realize the free ascension of human beings and land safely; It is a pity that since Wanhu, the hard work of three generations to develop rockets may have been in vain, which is not a small blow to Ding Lan, who has always insisted on developing rockets.

"Then I'll talk about rockets." Zhu Youzhen is also not modest, in fact, he has great expectations for the military application of rockets, and although the current rockets cannot be expected to destroy the opponent's armored vehicles and tanks like the Katyusha and V-2, they can still be of great help in striking at the nomadic cavalry, especially in frightening the war horses and disrupting the formation.

Once the rocket is used on the battlefield, it will speed up its development and play an unexpected role, which is also an opportunity for the Ming Dynasty to fully demonstrate advanced technology to the backward nations. "The rocket can't carry people to heaven now, it doesn't mean that it won't work in the future, the rocket develops to a certain point, its whereabouts can be controlled, and then it can be manned to ascend to heaven, although there is still a long way to go, but no matter how difficult it is, you can't give up. Now rockets, the direction of research should be range and accuracy. ”

Regarding range and accuracy, for Ding Lan, it is a new term, Zhu Youzhen took a little time to explain, because he used the vernacular way to describe, even Liu Yifei understood, under the subtle influence of Zhu Youzhen, he would never treat Ding Lan as an outlier again.

"Lord in charge, I may not be able to understand it now, but hot air balloons and rockets are epoch-making scientific achievements of the Ming Dynasty, and now they are being developed with Ding Lan as the leader, but the conditions for development are too poor, can the Lord in charge improve the development conditions and environment of Ding Lan?" For the development of such heavy scientific and technological achievements, Zhu Youzhen did not want Ding Lan to fight alone, the waste of talents of the Daming Firearms Bureau was very strict, and he had no way to improve the operating rules of the Firearms Bureau now, but he hoped that Liu Yifei could help Ding Lan and let Ding Lan engage in scientific research with peace of mind.

"Yes, Your Highness." From Zhu Youzhen's tone, Liu Yifei realized that balloons and rockets may be important scientific and technological achievements, and they are very promising to be realized, as the director of the Firearms Bureau, the most important generalist of Daming Firearms, has a much sharper grasp of cutting-edge science than ordinary people. But the research and development of Daming technology has always been done independently by craftsmen, although he really wants to do something for Ding Lan, but he doesn't know where to start, "But, can Your Highness make it clear how to help Ding Lan?" ”

Zhu Youzhen thought for a while, this can't blame Liu Yifei, this is a problem in the Ming system, it's no wonder that Liu Yifei who is in it can't understand it, it seems that he has to be a teacher again, "First, you can't discriminate against Ding Lan, give due respect to scientific and technological personnel, and correct Ding Lan's name; Second, equip Ding Lan with some assistants, including assistants in life, to liberate Ding Lan from tedious chores; 3. Cancel Ding Lan's work in other areas and specialize in the research of hot air balloons and rockets. ”

"Yes, Your Highness. The subordinates did the same. The subordinates will equip Ding Lan with ten craftsmen, and Ding Lan will use them uniformly. Knowing the direction, Liu Yifei had to do it.

"I will also give Ding Lan financial support." Speaking of this, Zhu Youzhen took out a silver ticket from his arms, "Ding Lan, the research and development work requires a lot of money, this is one hundred taels, take it first, if it is not enough, tell me again." Also, if you need help with other aspects, just tell me, a qiē, for hot air balloons with rockets. ”

Last time, in order to study grenades and mines, Zhu Youzhen also gave one hundred taels, but the one hundred taels was a guarantee for the success of the development, and this one hundred taels had no conditions, that is to say, no matter whether Ding Lan could successfully develop a hot air balloon and a rocket, this hundred taels belonged to Ding Lan, and this was the start-up capital for the research of hot air balloons and rockets, and if Ding Lan could develop it successfully, there would be another reward.

It can be seen that Zhu Youzhen attaches great importance to hot air balloons and rockets. Zhu Youzhen's attention is not only because hot air balloons and rockets may be used in the military, but more importantly, this is the scientific cause of the Ming Dynasty, which should have been allocated by the state, but the Ming court will only fight openly and secretly, who is willing to invest limited funds in scientific research? The country cannot fulfill its obligations, and Zhu Youzhen, who comes from later generations, is ready to take on this responsibility himself, besides, he is the prince, and it is also appropriate to do some responsibility for the Zhu dynasty.

When he came out of the Firearms Bureau and returned to King Xin's Mansion, it was already evening, and Zhu Youzhen, who was tired and excited, was about to have dinner under Wan'er's service, but Xu Yingyuan hurriedly ran in: "Your Highness, the holy decree has arrived." ”