Later generations were a little vague about what role Jiang Tian played in the shipyard because of secrecy, and the parties concerned were also tight-lipped about it, even some of the world-renowned ship design masters later only used vague words such as "played a decisive role" when recalling that time. It wasn't until more than 100 years later, when the ban on many top-secret materials was gradually lifted, that people finally knew what was going on. Jiang Tian was not only the first scientist to carry out scientific calculation and planning in the history of ship design in China and even in the world, but also created a separate discipline of fluid dynamics, and most importantly, he solved the corrosion resistance problem of steel hulls, which made the emergence of ironclad ships possible.

"Can this iron ship really float on the water?" The pervert looked at the topic on the blackboard in a daze, although His Majesty had also talked about this kind of problem, but at least it had not been realized yet, but Jiang Tian picked an extremely difficult topic.

Not only the perverts, but all the people were a little dazed after seeing the content of today's class for the first time. However, due to the stimulation of the trimaran in front, these people did not dare to deny it, but looked at Jiang Tian with a little excitement. If this problem can really be solved, then the Chinese fleet will be invincible in the world, and when the time comes, let alone artillery bombardment, even if it hits, it will be able to smash the enemy's ship into pieces.

Jiang Tian found a basin, filled it with more than half a basin of water, and then took out two plates for eating: "The porcelain plate is heavier than water, let's assume that it is an iron ship, if we fill it with water and put it in the basin, then the dish will sink to the bottom quickly." But if we don't let the water into the saucer, will we be able to avoid sinking to the bottom? ”

The answer is simple, as long as the water is not allowed to flow into the plate, then even a heavy disk or porcelain bowl floats smoothly on the water, which is a very common phenomenon in life, but in ancient times, almost no one applied this phenomenon to shipbuilding, did they not find this wonderful situation? In fact, it is not, just because with the ancient metallurgical technology, the amount of iron required to build such a steel ship is so large that the country cannot afford it, and at the same time, it cannot solve the problem of corrosion resistance of metal products in the sea. Then these two key factors that limit the appearance of steel battleships are not a problem in the eyes of Zhang Tao and Jiang Tian, the two traversers, although Zhang Tao only copied some small blast furnaces of the Great Iron and Steel Era, but in terms of technical level, it can be regarded as the world's advanced, and Jiang Tian happens to know how to prevent corrosion for battleships!

"Sir, we've tried paint made of various materials, but we can't make a piece of iron survive three months in the sea without rusting!" One old-looking researcher regretfully explained, "And once it rusts, it decays much faster than on land." ”

These people have now unconsciously changed the title of Jiang Tian from adult to sir, I don't know if this is their intentional or natural change, anyway, these people understand why the emperor values this junior brother so much, think about it, His Majesty is not those Ming Dynasty emperors who don't do their jobs, how can they reuse a certain wine bag and rice bag because of nepotism.

After listening to their complaints, Jiang Tian smiled, before the appearance of ship paint in the modern sense, this was indeed a headache, but he didn't know the formula of that kind of paint, and even if he knew, he might not be able to make it on a large scale, so his thinking was actually the opposite.

"Since we can't use paint to stop the steel from rotting, then there is actually another way to solve it, that is, to find a substitute for the steel and let this substitute rot first, which will play a protective role!"

Next, Jiang Tian had to start explaining the oxidation of metals again, and after figuring out this problem, he could start the experiment, and the principle of the test was very simple, that is, to find a metal that is more lively than steel and stick it on the surface of the metal hull, so that this thing can be sacrificed as an anode, this technology has a scientific name in later generations: cathodic protection technology. Jiang Tian knew that this technology was purely accidental, just because there was a sailing fan in his university dormitory, who was nagging all day long that if the ships of the Age of Discovery had this technology, they would be able to build ironclad cruisers across the seven seas in advance. But this guy didn't think about whether the sail power could satisfy a battleship made of pure steel.

"What can replace the rust of the iron sheet?" The researcher asked, surprised.

"You guys......" Jiang Tian turned around and wrote a few common metals on the blackboard: "Which of you will tell me what is the most lively thing that is easy to react with oxygen among these things?" ”

Everyone looked at each other, and no one dared to raise their hands to answer this question. Then Jiang Tian had no choice but to shake his head and draw a circle on a word on the blackboard: ""Heavenly Creation" has clouds: ...... Its character is as strong as a wolf, so it is called a Japanese lead! ”

After he said this, everyone suddenly realized that the magical thing of feelings is around them, even if they haven't figured out what cathode and anode are, but they know that this thing can delay the decay of steel.

So Jiang Tian modified this whimsical idea, the battleship only arranged steel armor and steel ribs in key positions, and the civilian ocean-going ships were iron-ribbed wood-hulled ships, mainly to increase the strength of the ships. But this compromise design also gave those designers a headache for a long time, because the large increase in the amount of metal made the ship overweight, not only the center of gravity needed to be recalculated, but even the loading capacity was affected, and later in order to ensure a certain amount of redundant buoyancy, the size of the ship had to be increased, and the impact of wind and waves on the hull should also be considered. In particular, after the aspect ratio has been greatly increased, the longitudinal strength of the ship has been greatly reduced, and the simple point is that it is too long and easy to fold in the middle. As a result, Jiang Tian overturned the original design of the sub-compartment, and added a longitudinal partition under the main deck as a stiffener, in order to ensure that the bow has enough buoyancy in the wind and waves, it was directly designed as a hollow bow, in order to resist the phenomenon of waves on the deck at high speed, the bow was stretched forward and the side of the ship floated outward, so that the last flying clipper boat that was not a flying clipper was baked!

It is said that it is not a flying clipper because Jiang Tian didn't know what a flying clipper was from the beginning, and the various designs of this thing were gradually modified after repeated experiments. To say that it is a clipper ship is that this type of ship is already similar to the flying clipper ship that appeared in the 19th century in another time and space, reaching a length to width ratio of more than 1:7, so that this kind of ship can reach a high speed of 20 knots. At this speed, the pirates could only look at the ship and sigh, even if the clippers in the navies of various countries could not catch up with him, which became the favorite mode of transportation used by smugglers. Of course, this is all an afterthought, because just to meet the needs of the navy, the orders for this kind of ship have been sold until 20 years later, and the people do not have this kind of ship at all, and the result is that as long as the pirates targeted by the navy, no matter how good the technology of those water rats is, they will not want to escape the arrest of the navy. So the ship was first known not for its speed across the oceans, but for its overwhelming maneuverability to clear pirates in the waters around China. It wasn't until a few decades later that a civilian trading ship with a displacement of less than 1,000 tons set a record for the fastest time from Guangzhou to London in 117 days, which caused a sensation in Europe and triggered a worldwide boom in the construction and research of clippers. The representative of the heyday is the Jiangnan shipyard launched, the displacement of 3,700 tons of "killer whale", this is a transpacific ocean luxury cruise ship, the maximum speed can reach 15 knots, according to Chinese standards is 28 kilometers per hour, until the large-scale appearance of steamships, which ended the legend of clippers, only some private yachts are still partially used this type of ship.

When it comes to ship standards, Jiang Tian, as a traverser, did not let go of the right to customize the standard, first of all, he replaced the speed unit commonly used in later generations with kilometers, after all, China is not Europe, and it is a bit embarrassing to use nautical miles to convert. It doesn't matter if it was put in the past, after all, Jiang Tian came from China to miss the time and space of the Age of Discovery. But this world must have the presence of Chinese ocean-going traders, so all kinds of standards must be adopted according to Chinese habits. Even if it can't become a world standard for a while, both he and Zhang Tao are confident that Chinese will become the world's common language in the future, the metric unit will become the world's standard in the future, and the rules of the game formulated by China will bind all countries participating in the game. Therefore, in order to come early on this day, Jiang Tian deliberately let the entire researcher and even the workers of the shipyard get acquainted with the metric unit from now on, and strictly limit the tolerances, forcing them to abandon the original history of building ships based on experience and rough measurements. Instead, it is developing on the road of standardization and standardization.

Just when the researchers were still worried about the drawings, Jiang Tian's heart was actually very depressed, seeing that the two-month time was about to come, not to mention that the level of these short-term training trainees was unsatisfactory, even if they let their bold design a ship be towed until this time. But this is not the essence of Jiang Tian's worries, after all, it is already a god to have the current situation, and it is impossible to build a research system in such a short period of time in any country, and it is only with the convenience of his foresight that he Jiang Tian has this ability. Zhang Tao put him in this remote corner to keep him away from politics, but judging from the various news that came back, two months was still a bit short, and it could not overwhelm the old school. It looks like Sun Wukong, who is pressed by the Buddha, always wonders if he can break free from this five-finger mountain.

In the eyes of outsiders, reform seems to be a sure thing, even if those old men of land and wealth make trouble, how far can they go? In fact, they thought wrong, after all, in the vast rural areas, the rights and popularity of the clan and gentry are still not completely replaced by the imperial court, with such a premise, it means that the foundation of these people is still there, and they can still grasp the guidance of public opinion among the people. Therefore, Jiang Tian looked at Di Bao every day and was worried, but he couldn't use any strength.

The pervert saw this qiē in his eyes, but he still thought that Jiang Tian was worried about the sisters and sisters in Beijing, and he had the heart to find two people to warm the bed for his husband, right? But the situation in this place is special, and ordinary people don't say they come in, even if they turn around a few more times, there will be people to check it, so he doesn't dare to commit a crime against the wind and touch this moldy head. Besides, if Xinyue knows, I'm afraid that I won't be able to copy other people's exam papers again. Then there is only one way to organize entertainment activities, but in such a place where men gather, what entertainment is there to do?

So, Jiang Tian and Liu Baokai naturally picked up the cards and fought the landlords with the soldiers who had no scientific research tasks and were not on duty. I don't dare to say that the sky is dark, at least it is also a person on his back, in short, don't look at the army where there is a clear distinction between upper and lower levels, when he sees Jiang Tian, no matter the officers and soldiers salute properly. But when it came to the gambling table, these people definitely did not take care of the chief's idea, and in addition to luck, they also took advantage of this kind of play to match the cards, excluding the simple and clear of pure gambling, but a little more calculated, when the card friends were not adaptable, Jiang Tian also killed an equal, and did not let the money in his pocket become too little.

When Zheng Hongming came to Jiang Tian because of academic problems, he almost couldn't believe his eyes, only to see a respected big expert, his face was covered with notes, and the chips in front of him were pitiful: "Sir!" You have a little problem in your research, and I really can't think of it, so I plan to ask you for advice! ”

Zheng Hongming kept smiling when he spoke, but he didn't know which person in the room to look at? This can only be blamed on their poor level, and they all have their faces covered in notes, which at first glance look like they are holding a mop.

"What's the problem?" At this time, Jiang Tian was looking at the cards he grabbed in a daze, thinking that if such a card was in his hand, it seemed that this time the note would not be able to run.

After knowing who Jiang Tian was, Zheng Hongming hurriedly saluted him again: "It's the battleship you asked to design, and the gun position of 100 guns is not a small number, so I had to open the window on the side of the ship, and just like that, it was also put in three layers." But the high-speed ship type is not suitable for more guns on the side of the ship! ”

"Alas......" Jiang Tian sighed a little hateful that iron is not steel, and at the same time he threw the cards in his hand on the table: "Since it is not suitable for more artillery, then you can change the ship type!" ”

Don't look at the size of the gambling table, but these soldiers are not stupid, look at this posture not only Jiang Tian has official business to be busy, but also a bit of an eviction order, so no matter how smelly the cards in this guy's hand are, you can't shout that you will finish this game before working, so another failure was dodged by Jiang Tian.

Zheng Hongming was actually frightened by Jiang Tian's fame and talent, if it was in normal times, even if there was no such expert to consult, their technical backbones would not be able to come up with a solution if they met to study it, but when Jiang Tian came here, they seemed to have begun to rely on such a universal talent, and they didn't know how to find a way to solve the problem, but naturally wanted to ask Jiang Tian what to do. This time, he was awakened by Jiang Tian's words, why should he be entangled in the speed of the ship? Anyway, the main purpose of the battleship is to bombard with naval guns, and the speed sacrifice point is not too much of a problem, but it would be nice if it could take both sides into account. But looking at Jiang Tian's meaning, it seems that there is really a way to get the best of both worlds.

So Jiang Tian, who was a little anxious to lose, began to make up for these researchers in a high-sounding manner, thus avoiding the sad reality that he was about to lose all his belongings. Although there are many officers and soldiers who are obsessed with this card game, they all think that Jiang Tian is taking the opportunity to get out, but after all, people's official positions are there, not to mention that the golden cicada has come out of his shell, even if it is a bad debt, what can he do? Fortunately, the official of this Yipin did not repay the debt, in fact, because the gambling book was very small, so Jiang Tian did not lose much money, and Liu Baokai also planned to pay off the account behind his back, but Jiang Tian has always had good self-control, and he did not expand the gambling funds beyond his own Yulu, fortunately, he did not live on Yulu, so it didn't matter if he lost it all.

As for Zheng Hongming, he doesn't have so many ideas now, he has been impressed by Jiang Tian's wisdom and creative power, strictly speaking, the design of the battleship is still led by Jiang Tian, and in order to place a large number of broadside guns, he had to adopt the common European ship's inward tilt scheme, due to the elongation of the hull, so although it is still a three-layer artillery deck, in order to reduce the center of gravity, the number of guns on each deck is different, in general, it is much lower, and less above, At the same time, in order to overcome the problem of weakened anti-roll ability caused by the inverted design and the high center of gravity, Jiang Tian put forward the idea of the stabilizer fin for the first time in this time and space, but gave up because the design was too complicated, and then turned to the transformation of the keel. This was also important for improving the accuracy of artillery fire, a design common to later large warships that was an epoch-making revolution in this era, except that a plank sticking out of the hull increased drag, and also affected the operational flexibility of the ship, but for huge battleships, this was not a problem. The revolutionary design did not stop there, such as steel armor in key positions, keels and masts spliced with slightly shorter timbers, double rudders to increase maneuverability, improved sails using pulley blocks, and rotating gun emplacements with 90-degree angles of fire at the bow and stern, in short, this ship could be regarded as the strongest battleship in the world within 50 years.

Just when everyone was still immersed in this futuristic warship design, a fast horse galloped from the capital, and when Jiang Tian saw that the person who came to deliver the decree was not a eunuch but a forbidden army, he knew that he could not return to the capital for the time being. In addition to praising and affirming Jiang Tian's contribution to the design of Chinese ships in the past two months, the emperor asked him to rush to the military port of Shanhaiguan within a few days, saying that there were important goods to be handed over, and at the same time, a company of forbidden cavalry had already gone on the road, and he would act as his escort and escort the goods into Beijing at that time!

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