Some of the technicians in the shipyard had already struggled in this profession before the emperor ascended to the throne. Anyone who dares to question their professional competence will probably lead to bloodshed. But Jiang Tian asked them to go back to the furnace to make up for the class, even if these people were unwilling in their hearts, they had to come with an open mind to listen to the lecture. This is not only because of Jiang Tian's reputation, but also because of the teacher-student relationship between this kid and the emperor, giving him face is equivalent to giving the royal face, even a science man who lacks heart knows how to choose. Corresponding to this is a certain feeling of distrust among shipbuilders. Especially those craftsmen who have been handed down from their ancestors, they all feel that this is a precursor to Jiang Tian's prestige, and it has nothing to do with technology.

"They can think whatever they want, and as long as they listen to my classes, the so-called technicians will know what mistakes they have made. As for what ship will be built, it doesn't depend on my design, but on our shipbuilding technology! Jiang Tian, who was lying on his makeshift bed, rubbed his temples, browsing a large number of research materials in the past few days, which made him feel dizzy.

Liu Baokai, who had never really seen the sea before, and had been fooling around with fishermen in the port for the past two days, nodded, he believed in Jiang Tian's ability, and there was no objection to Jiang Tian's judgment. Before leaving, his father had repeatedly told him that the main purpose of Liu Baokai's trip was not only to have a good relationship with the future navy, but also to try to eliminate the unstable factors that interfered with Jiang Tian. But after observing it in the past few days, not to mention the people who are technically opposed, even the guys who were a little unconvinced were also infected by his work attitude of forgetting to sleep and eat. So when Jiang Tian proposed to start a lecture, even if some people didn't care about it, they decided to listen carefully and then talk about it, he Liu Baokai really had nothing to do. In the past two days, I can only catch some sea fish, shells and other things to relieve my boredom.

As soon as he heard that he was going to class again, the pervert instinctively resisted a little, but when he remembered his duties, he felt a headache spreading. Jiang Tian, who was infinitely slandered in his heart to choose him as his follower, but his face was silent. Although he is a layman, he has fully experienced the complexity of shipbuilding in the past few days, not to mention the ships being outfitted, just a pile of wood on the slipway that is still in a state of parts, when he is dizzy and does not know what he can do. It's okay if you don't understand the structure of the ship at all, and what's worse is that he's still a landlubber, and the first time he walks on the beach, he almost stumbles into a thousand hatreds, so he has been away from the coast ever since. Jiang Tian always laughed at this person who grew up by the Haihe River for not being able to swim, although Jiang Tian's water nature was not very good, but at least he was not afraid of water.

In the hot season, the nights on the seashore are still very cool, because of the air flow, there will be a strong sea breeze blowing from the ocean to the land every night, and the wind speed is so strong that mosquitoes can't stay on people, so Jiang Tian likes to move the bed outdoors in this season, facing the direction of the sea to enjoy the evening breeze, and he is not afraid of the wind chill because he is still young, so he actually has a comfortable summer this summer. It was only when he faced the experienced shipbuilders that he began to miss the half-baked students in Beijing.

"How many times have I said it! The maximum speed of the boat should refer to the aspect ratio and the maximum propulsion, considering that the sail boat has a single power, it depends on how slender the hull is and the efficiency of the sail, not that the bigger you think, the slower! One hand shook the fan desperately, Jiang Tian still felt a little hot and unbearable.

It's no wonder that these old workers are a bit dead-eyed, it can only be said that their level of knowledge limits their knowledge of ships, and even their understanding of fluid dynamics. These people instinctively feel that the bigger the ship, the slower the speed, even if the Western warship is larger than our fortune ship but still fast, but it is just that the foreigners do not load the goods, and the sails are different from ours, and they do not realize the role of the aspect ratio in this. But the Ming Dynasty standard warship is not without clippers, although the tonnage is not large, but it is very scientific to use the slender ship type, whether it is a centipede ship with oars and sails, or an auxiliary sea cangship, there are structural advantages in the modern sense, but it is a pity that from the beginning of the Ming Dynasty sea ban, China's shipbuilding industry has experienced a ruined blow, not only experienced workers have been lost, even the existing ship drawings are only known but do not know why. If Jiang Tian had traveled 250 years earlier, catching up with Zhu Di's reign during the Great Voyage Period, it is estimated that China's shipbuilding industry would not only be ahead of Europe.

"Different ships, the use is different, the structure is also very different, warships should be sturdy and durable, consider a variety of indicators such as wind and wave resistance and sinking resistance, and at the same time have weapons in separate warehouses, and have sufficient safety facilities for gunpowder and other dangerous goods. Civilian ships don't have to think about these ......" Standing in front of the blackboard, Jiang Tian wrote the main points while using the most concise words to let these people figure out what they were doing: "If it is offshore trade, you need to use a deadweight dà, a ship with spacious space, and the relative wind and wave resistance and other factors are poor." As for ocean-going trading ships, unless they can be very large, speed and sinking resistance come first, because their worst enemies are pirates and storms. ”

The pervert, who was worried about the boredom of the course, was more energetic than any researcher at the moment, because he didn't expect Jiang Tian to explain the seemingly highly professional course in such a simple way and make people think deeply. He had heard of pirates coming and going at sea before, and the entire southeast coast of the late Ming Dynasty had become a paradise for several pirates, as for the Zheng family, who had not yet accepted the king's transformation, if it wasn't for the fact that he had a ship in his hand, and there was a group of experienced shipwrights, otherwise he would be able to pacify this thief with a cavalry guarantee. Even those researchers think so, it is precisely because the mainland cannot find a better craftsman now, so they have not been able to jump out of the circle of Ming Dynasty ship type. In the eyes of these people, the reason why they could not build an excellent new ship that could satisfy the emperor was entirely because of the lack of experienced workers under them, but Jiang Tian was now telling them that you didn't have that ability at all, and standing in this position was just a corpse vegetarian meal!

Of course, Jiang Tian didn't say this sentence, but all the people who were listening would have this feeling, even if the other party just casually said one or two nouns, it could make these people study for a long time, for example, Jiang Tian said just now, the ship mainly has two situations in the waves: roll and pitch. These two shaking sensations may not be difficult to guess, but Jiang Tian also said that the roll depends on the righting moment of the ship itself to get rid of it, and the key factor that produces the righting moment is not only the position of the center of gravity, but also the design of the ship's side...... A group of people stared at Jiang Tian with small eyes, they really wanted to put forward the questions in their hearts, but there were so many questions that they didn't know where to start, this was just a casual general explanation, if they really analyzed a specific problem in depth, could they really understand what people were saying?

At this time, Liu Baokai, who didn't learn and didn't know how to do it, even if he raised his eyebrows, anyway, he had also studied in Jiang Tian's private school, and he could understand those messy new terms relatively quickly. Jiang Tian, who also found that the foundation of these people was too poor, had to let the pervert "reluctantly" explain the doubts of his classmates, and if there was anything he didn't understand, he would ask Jiang Tian. In short, there was a shutdown on the first day of class, not only Jiang Tian did not expect it, but even Zheng Hongming, the director of the shipyard, did not expect it. However, he also understood that this suspension was a force majeure, and the backbones on his side were like listening to a book from heaven, and they didn't know what it meant at all. After Liu Baokai's plausible explanation, many people could immediately understand the meaning, and found that this awe-inspiring little grandfather was actually a half-bottle of vinegar. But with such a second-hand counselor, the new knowledge he has mastered is already very comparable.

The pervert, whose vanity has been greatly satisfied, secretly swears in his heart that in order to be sought after like today in the future, he must study hard and never doze off again in class! As for whether his grand vision can be realized, it is estimated that he has no bottom in his heart. However, in the process of explaining, he also found that Jiang Tian could always summarize a set of complex theories with one or two very incisive sentences, and these theories were related to the seemingly useless scientific knowledge he had learned in class. Even a layman like him could think that increasing the buoyancy of the bow could ensure that the bow would always be higher than the water, and the specific mechanical analysis could be applied to the principle of leverage, so as to obtain the position of the ship's center of gravity and how much wind and waves it could resist! This is not yet a ship launched, and it is possible to calculate the approximate table in the ocean. He suddenly felt that if even he could think of this, if Song Yi or the prince were to be his followers, wouldn't he be able to directly participate in the design?

"It's not as simple as you think!" Jiang Tian refuted his lofty ideas: "You can see what is wrong with their design, but even if I point out the mistakes, they may not have the ability to change them, maybe it is better to tear down and start over a little faster." ”

"But...... There are already two ships on the slipway, and if we have to tear them down and start over, won't we have to tear down all these half-finished ships? ”

"Who said they were going to be torn down? It's just that it's just built and handed over to the people, because even if this kind of ship is built, it's not much more advanced than before, and it's better to build a new one. ”

If it had been placed in the past, who would have dared to directly command the shipyard to sell ships? If there is no warrant from the emperor, it is the sin of bullying the king, but now don't say that Jiang Tian holds the title of Qincha, that is, who in the whole shipyard does not know that this is a first-class ship expert, if people conclude that your work does not enter the stream, then it is best to humbly admit incompetence, and ask what is wrong, if anyone dares to question the expert without opening his eyes, it is estimated that he can be despised to death by the technicians up and down the whole factory.

Speaking of which, there is another episode, just when Jiang Tian was immersed in the drawings and carefully studied their technical level, a holy decree suddenly came, it was originally just an unknown naval shipyard, but it was upgraded to the Dagu Ship Research Branch of the Royal Naval Research Institute! And Zheng Hongming naturally became the first dean, as for his boss, the so-called Royal Naval Research Institute, although it is only a name at present, but there is already a first dean, that is, Jiang Tian, who is still competing with the drawings. As for how to build this research institute, the emperor did not say, nor did he stipulate what results should be researched, so much so that it was a bit like establishing a yamen for Jiang Tian. So don't say that Jiang Tian can't look down on the two ships under construction, even if he does, he has the power to kill and kill. As for the inside of the imperial court, now it is boiling against Yingtian for reform, so no one cares which corner Jiang Tian hid into, as for what naval research institute, anyway, civil officials can't ask about military affairs, so he can do whatever he likes.

Smart people know that this is the emperor to find a shield for Jiang Tian, and even more smart people also guessed that this is the emperor looking for the future backbone of the prince's East Palace, don't look at Zhang Tao is now at the peak of the Spring and Autumn Period, generally speaking, the founding monarch has been fighting for many years, and there are more or less hidden diseases, who can say exactly how many years he can live, and the emperor in his fifties has not died less, so now leaving the prince with some usable talents who can support the orphan is a problem that normal monarchs will consider, from this point of view, Whether it is his relationship with the royal family or the current title of the crown prince, he has this meaning, and at the same time, it also reassures the current officials, don't look at him by the emperor's favor, but he will not be able to take power until the crown prince ascends the throne. Jiang Tian didn't pay attention to Zhang Tao's arrangement, because when everyone thought that he was going out to hide quietly, only the emperor and himself knew best in their hearts how important this naval research institute was. So in Jiang Tian's eyes, this is by no means a title to fool people, but something that must be taken seriously.

"Dig me a three-kilometre waterway along this river, and the requirement is to use living water, and at the same time the river is straight! The width is tentatively set at ten meters and the depth is two meters! Jiang Tian lightly drew a line on a simple map: "This will be the base for us to test the new ship type!" ”

Although he was talking about a new measure, these people immediately converted the specific number jù in their minds, and if they think about it carefully, is this a little small? Such a narrow river is a ditch at most, even if it is three kilometers long, but it can't run a big boat? Everyone looked at each other, not knowing what Jiang Tian wanted to do.

"Don't guess! This waterway is used for model testing, after all, it is too expensive to build a real ship, if it is only a small model, not only the construction period is greatly shortened, but also the reliability of the ship type can be checked in advance. Even if you accidentally sink it, you don't feel distressed. ”

Jiang Tian's arrangement was very common in later generations, and even some universities with professional points had similar small facilities. In the seventeenth century, such a professional hydrodynamic test device may be unparalleled in the world, assuming that this facility can really play its due role, it will play an incalculable value, just imagine that when Europe still relied on experience to explore shipbuilding technology, you have used such advanced things to verify various designs, in less than a hundred years, China's shipbuilding technology will not only surpass Europe, as long as this secret is not disclosed, then the future of the sea can only be dominated by the Chinese.

According to the information of later generations, this secret test base has indeed been concealed for more than 100 years, and the troops guarding the facility are all absolutely loyal Praetorian Guards, and all relevant personnel have been given gag orders, and the research materials accumulated over the past hundred years are also top secret. Later, it was the great development of surveying and mapping cottage technology in Europe, and it was difficult to maintain this leading edge anymore, especially after the steam engine gradually became the mainstream of ship power, which gradually lifted the ban on some related facilities. However, at that time, it had been renamed the Royal Central Fluid Power Research Center, which included not only the testing of surface ships, but also a large number of studies related to aerodynamics and underwater acoustic conduction, which exceeded the scale of Jiang Tian's original plan by five times. Three hundred years later, it has become the world's largest, most powerful, most experienced, most complete equipment, and most comprehensive research base in related fields.

Time to pull back to Jiang Tian here, fortunately, the coastal area of Tianjin belongs to the alluvial plain, belongs to the land where the river sediment is piled up, I want to be when Nezha was in the sea, the coastline has to retract back dozens of miles, after thousands of years of accumulation, there is a later coastal area, itself is the river vertical and horizontal soil is soft, so there is not much difficulty in digging the river here. It's just that the construction level of this era is limited, and within two months, Jiang Tian can only retreat to find a relatively straight small ditch, and then let the boatmen carry everyone and throw the verification models one by one into the river to observe the various designs on the calm water, or drag them with a rope to observe the state of movement. Such primitive conditions have also been recorded in the annals of history and have become a must-read history for students of this major in later generations. It's just that they don't know that back then, such a creative method made those researchers inexplicably excited, but the carpenters in the shipyard were miserable, pestered by these people every day to make models, not to mention, they also have extremely high requirements for the fineness of the model, especially the bottom and side of the ship, which must be accurate to the millimeter level.

Looking at their enthusiasm and hard work, Jiang Tian nodded with satisfaction, this is the revolutionary scene of science @ leap @ advancement! Let these guys who haven't even mastered the basic knowledge expand their imagination a little more, maybe someone will have a flash of inspiration to carve an epoch-making classic boat type, although the probability is a bit low, but there is plenty of time. He believed that no one in Europeans knew better than them about the performance of the various linear types of ships in the water until they had a full grasp of fluid dynamics. According to this development trend, is there still any need to worry that the Chinese Navy will not be able to conquer the world?

Liu Baokai, who is playful and immortal, has also plunged into the enthusiasm for shipbuilding in the past two days, he did not expect that this kind of child-like practice can also summarize the scientific truth, and a group of researchers of different ages are crowded in a few small boats, staring intently at the boats on the river, recording their various states at various speeds and wave heights, so a new type of ship that will shake the world is slowly born in these records.

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