For Jiang Tian, it is not difficult to manage or control these international students, after all, in the traditional Chinese culture, respect for teachers and Taoism has been deeply rooted in the blood, since the Zhou Gongdan set the Zhou ceremony, no school has overturned this habit, except for the Legalists who advocate that the law is higher than a qiē, Confucianism is completely believed that the dignity of the teacher is more important than anything else. Of course, the question of whether the law is greater than the law or the law is greater than the love has been debated endlessly, and modern society generally believes that the law should be higher than the human feelings, but when the law is not perfect, it is easy to produce various problems, and the key is who can be sure that the current law is perfect enough? Therefore, no matter what political system is adopted in Chinese society, it will inevitably be mixed with the elements of rule by man in the end. Speaking specifically of Jiang Tian's school, no one will challenge his prestige regardless of his background or traditional habits, except for Zhang Huan, who always likes to ask him questions, no student dares to question his academic authority. Even Koreans and Japanese, who knew nothing about the new school, found themselves underestimating the breadth and profundity of science after they began to study. When the Academy of Sciences got the drawings and began trial production, it was found that this seemingly simple weapon was not easier than the things developed before, and it could even be said that it basically integrated the previous scientific research results, and also stumbled the existing trial production work, and the main problem was that the existing processing accuracy was really difficult to achieve the value specified in the bidding document.

"I said that the thickness of the shell should be at least 0.5 mm, so as to ensure that the rocket has enough residual thrust for the warhead, and you can only make a large firework with this 0.8 mm iron sheet now!" Jiang Tian held an arm-thick iron cylinder and measured it with an earthen caliper: "I don't need to tell you about the relationship between thrust and the weight of the rocket!" ”

Listening to the stern reprimand, Song Yi felt a little aggrieved, not that he didn't want to meet the design standards, but that he really couldn't make the iron sheet thinner: "Sir, the current accuracy of the pressure roller can only reach this level, and it is often scrapped, and if it is thinner, we can only improve the machine first, and we found that although the wrought iron sheet is soft but not strong enough, it may be deformed if you bump it casually." ”

Of course, Jiang Tian knows this problem, but he is not yet able to smelt aluminum on a large scale, and at the same time he does not have enough capacity to produce steel plates, iron sheet is the most suitable outer wall material at the moment, and later found that the thrust of the rocket engine is insufficient, in other words, the energy of the first is insufficient, and it cannot achieve the range and power originally envisaged. Jiang Tian had to try his best to reduce the weight of the rocket, and at the same time began to improve the propellant, but he only had a little knowledge of chemistry in the school exam, and it was obviously unrealistic to switch to a certain chemical propellant, so he could only pin his hopes on the improvement of **. So he found that if the gunpowder was mixed with a certain passivator, although it could burn for a longer time, the instantaneous thrust would drop so much that the rocket could not leave the launch frame smoothly...... The cold wind in the northwest is howling, but Jiang Tian's heart is burning like a fire, and the backward development progress is only one of the aspects, the key is that there is already a new ship formed in Tianjin Port, and it will be able to go to sea for sea trials in the spring of next year, if the improved frigate proves to be successful, but he can't come up with the corresponding weapons on his side, then his idea of relying on fast light ships to maintain coastal safety will be in vain. And if we go back to the old path of those slow ship types in the past, it will be a great waste of resources and the development of the navy, not to mention that there are many people who actually do not want the navy to grow and develop.

Another engine test is about to begin, the so-called engine is actually an iron amplified gunpowder barrel, on the side of the vent designed a closed horn shape, the propellant has been changed to a hollow column, in order to be fully combusted, but also in order to obtain enough initial speed, the charge is divided into two parts, near the center is the fast burning charge, in order to push the heavy rocket off the rack, when the rocket flies away from the launch pad after the slow charge is ignited, and provide it with the remaining continuous thrust, The complex spinning engine in the original design has also been removed, and the stability of the rocket depends on the redesigned trapezoidal side strip wings, and the four wing root lengths reach three-quarters of the whole rocket The small side strips are arranged in a cross shape on the arrow body, the advantage of this design is that it not only obtains the lift provided by the short wing, but also minimizes the windward resistance caused by the wings, because the largest variable in air resistance is the cross-sectional area of the object, and another advantage is that it can provide a certain longitudinal strength for the thinner rocket body. This shape is Jiang Tian's copy of the shape of the air defense missile of later generations in his memory, but his rocket obviously has no guidance ability, so the dispersion accuracy is much greater than the original spin method. He can't take care of this defect anymore, if this ignition test still can't pass guò, I'm afraid he won't be able to get the desired results before the Spring Festival. A rocket engine with a @ body is laid flat on a slide car, and a thin wire rope is attached to the body, and the end of the rope is a car weight marked with weight, if the engine can be dragged forward after ignition, then it proves that it can provide enough thrust for the designed rocket, if it does not move, then it proves that the test will end in failure.

This test platform was an idea that Jiang Tian came up with, which could not only test the thrust but also accurately calculate the working time of the rocket. At this moment, he stood outside the test site and nodded to the haggard Song Yi, and Song Yi began to prepare for the ignition, first of all, to prepare a rough benzene clockwork. Although Jiang Tian proposed the structure and principle of the escapement, the people in the clock development team were not able to improve it for the time being, so they had to make some imitations first. But even this kind of copycat table clock was fully praised by Zhang Tao, and urged to develop the pendulum clock first so that it could be placed in the imperial study. Originally, after being requisitioned by Jiang Tian, he had been very depressed.

After a qiē was ready, Song Yi was ready to ignite the fire, the color @ wolf has always coveted this work, maybe he felt that he was lighting a huge firecracker, and then there was a test when the engine was not fixed, and it hit a researcher directly, although it was not fatal, but it burned most of his face, and from then on, as long as it was a test engine, Liu Baokai ran far away, so the work returned to Song Yi's hands. There is nothing brilliant about the ignition mechanism, that is, a lead connects the gunpowder inside, but there is a layer of wax at the nozzle to seal it, and the high-temperature gunpowder gas will break through this layer of obstruction, and the direction of the spray is standardized in the trumpet-shaped shroud. So when the lead burned out, we saw a thick smoke suddenly burst out, which is the unique smoke of gunpowder burning, a huge roar came, the silk rope on the slide rail was stretched straight, the weight behind the rope was pulled instantly, and then it stopped for one to two seconds, and then the sound of the engine changed, this is the sound of the slow medicine began to burn, and the load-bearing vehicle moved again. Jiang Tian's heart sank, the take-off thrust was still insufficient, this was almost the limit of the gunpowder thrust, and if he wanted to improve it, he could only replace other propellants, and with only the existing chemical ability, it was almost impossible. And that momentary stagnation just now can cause unpredictable ballistic changes during flight.

The engine burned for less than five seconds in total, and the red nozzle was already a little deformed, which showed that the material that was too thin could not ensure the performance of ablation resistance. And Jiang Tian just picked up the number recorded by the three researchers at the same time and compared it, and there was no big difference. Then he said to Liu Baokai, who came over: "It seems that our rocket is not as powerful as expected." ”

Although the color @ wolf gives people the impression that they are unlearned, they have at least received a certain amount of scientific education, so they understand that the problem caused by the lack of thrust is the shortening of the range and the reduction of the charge. However, he is not as pessimistic as Jiang Tian: "Sir, the red-clothed cannon claims to be able to shoot eight miles!" In fact, it is only able to hit, whether it is power or accuracy can only be left to fate, usually only used within two miles, now your rocket can fly a kilometer is enough, don't worry about it. ”

Jiang Tian also knew that this was the truth, in the era when there was no long-range observation and sighting means, most of the artillery had to be used within visual distance, unless it was a siege cannon bombarding the city wall, it was too far to know where to hit. But the rocket is different, it itself depends on the number to make up for the accuracy, it is a long-range surface kill weapon, too close range and too large dispersion, will make the consumption ratio of this weapon greatly discounted, especially in naval warfare against the size of a battleship, if you can't carry out an effective round of strikes outside the range of the opponent's gun, then what's the point of equipping it? Liu Baokai did not know the difference between naval weapons and army weapons, and in the eyes of the army, what was still usable could be moved to the ship and become chicken ribs, and the reverse was also true. Moreover, there is another test of naval weapons that the army does not have, that is, the ability to resist the erosion of salt water vapor.

After seeing that Song Yi had already brought back the wreckage of the engine, Jiang Tian did not immediately inspect the scrap iron, but asked another question: "How are those new arrow body materials developed?" ”

The new material mentioned by Jiang Tian is a very common thing in later generations, so much so that many people ignore its existence, or forget the importance of this thing. At least in the various novels that Jiang Tian had read before crossing over, very few people mentioned this world-changing invention, and even Jiang Tian himself didn't think of developing this kind of thing first if he hadn't thought that rockets should be resistant to salt spray erosion. Fortunately, the Academy of Sciences was able to mobilize the strength of the whole country to concentrate on tackling key problems, so when the research group was divided into several project groups, the speed of parallel research and development was not slow, and there was no advanced scientific and technological content in that thing.

Song Yi, who was still a little depressed, immediately came to his senses when he heard him ask: "Sir's whimsy, the iron sheet has been soaked in water for more than ten days, and it has not yet decayed!" ”

Lust @ wolf quickly straightened his ears when he heard it: "The iron sheet doesn't rot in the water?" ”

Jiang Tian nodded: "Do you remember the anti-rust test you and I did in Bohai Bay in the summer?" The outer edge of the iron sheet is wrapped with a thin zinc film, which can be kept stainless for several years in the wilderness, even on the sea, as long as it is not soaked in seawater for a year or two. ”

This miraculous iron sheet has a scientific name called galvanized sheet in later generations, the most common use is automobile steel plate, and galvanized sheet also has a relative called tin plate, this kind of thing is widely used to the point that if human beings leave it, many products will fall into the situation of no suitable packaging materials. And it also has a common name in China called tinplate! Tin plate first appeared in Germany in the 14th century, and later in the 18th and 19th centuries, the British began to widely industrialize manufacturing, since then people have a suitable canned box, but also made many exploration, military, navigation and other organizations and individuals who need to preserve food for a long time have convenient portable rations, and later canned beverages can not be separated from this material. However, in this time and space, tinplate was still lying in the Bavarian workshop, and it was still half a century before the British made tinplate. Not to mention that at this time, Europe did not know what zinc was, and it was even more impossible to manufacture galvanized sheets. Therefore, Germany has been competing with China for the invention right of tinplate, but galvanized sheet is indisputably considered another great invention of Jiang Tian.

On the eighth day of the twelfth month of the lunar calendar, the first snow fell in the capital, this snow came a little later than last year, the streets and alleys have begun to have the atmosphere of the New Year, a group of children are running and throwing snowballs, and the faces of adults are also somewhat smiling, it can be seen that everyone's life is okay with the year that is about to end, the price of grain has been very stable, and the farmers have received the grain regardless of the year, and they do not have to worry about the grain merchants controlling the purchase price, which makes the farmers' food and clothing guaranteed. All kinds of commercial activities are developing rapidly under the stimulation of the new tax law, small merchants and hawkers do not have to worry about the harassment of all kinds of cows, ghosts, snakes and gods as long as they pay a fixed amount of business tax on time, and there is always some surplus money accumulated every month, and the big merchants and merchants have no longer have the extortion in the open and in the dark before, and the goods entering Beijing do not have to pay the city tax, as long as you can issue a tax payment certificate, you can walk the whole country. For those European maritime merchants, it was already unthinkable to be able to enter the hinterland of the Central Plains, and they did not care about the troublesome quarantine procedures. China's capital finally recreated the scene of merchants gathering in the Tang and Song dynasties, and the glassware and glass mirrors in the hands of the Yi people are no longer sought after, since the glass factory in the suburbs of Beijing was officially put into operation, China's glass products have begun to be sold back to the colonies in Southeast Asia, and the Dutch East India Company is hoarding glass mirrors the size of a basin, ready to be shipped back to Europe in one breath to make huge profits, but unfortunately the production of mirrors of this specification is limited, and they are not enough this year. After less than a year of running-in, the whole country has gradually adapted to the new tax law and various systems, and except for the big landlords and former monopoly businessmen, they basically welcome the new policy. Because although there are many taxes and fees now, the collection is basically reasonable, and there are no invisible apportionments in the new establishment of the state, but there is always hope of making a profit if it is a legitimate business. In the past, those monopolistic guild organizations also did not dare to brazenly control the market, but the current economic system of the Chinese Dynasty is quite a rudimentary form of a market economy.

Let's not care about how the small people in the market look forward to this year's Spring Festival, Jiang Tian has almost no expectations for the upcoming festival, at this moment he is standing in the imperial study and looking at his big boss with shame, and the emperor of this country, Comrade Zhang Tao, who is proficient in all aspects of Wen Taowu, is seriously looking at the thick report.

After a long time, Zhang Tao put down the report in his hand, and then looked at Jiang Tian very strictly: "So...... Shrink! ”

Jiang Tian nodded with difficulty, although he was also a traverser, the other party could understand the difficulties of the development work, and there was no one else in the study, but Jiang Tian still felt unspeakable: "I thought that I could design an epoch-making new weapon in one step, but I underestimated the performance of ** as a propellant." In addition, the machining difficulty of the spin system was underestimated, so the aerodynamic shape had to be changed back to the traditional layout, and the elastic wing was kept stable. So the maximum firing range can only reach two kilometers, and this is not counting the reduction in charge due to the reduction in diameter. ”

Zhang Tao still looked at Jiang Tian expressionlessly, without any disappointed or angry expression first: "It's not just that, right?" Your weapon was originally mounted on a battleship, and I looked at the design of your launcher, and you seem to have forgotten about the ablation of the rear deck by the rocket tail flame! ”

"Uh...... I've realized which problem, so I'm improving the launcher...... "Jiang Tian is more and more unconfident.

"Alas......" Zhang Tao rubbed his temples: "This is your own boasting that Haikou can have an epoch-making weapon, and the civil and military of the Manchu Dynasty have heard it." Of course, in terms of performance, your rocket has surpassed the Divine Fire Flying Crow, Jiaolong Out of the Water and the like many times, but it is still far from the goal of that kind of weapon of mass destruction. ”

Jiang Tian nodded with difficulty: "The main reason is that the production cost remains high, and if the army does not purchase millions of rounds, I am afraid it will not be able to reduce the cost." ”

The reason why Zhang Tao is familiar with the work of rockets is related to the fact that he played 40 rocket launchers and 107 rocket launchers in the army that year. In fact, in his opinion, although this kind of rocket artillery with a diameter of only 80 millimeters cannot sink enemy ships remotely, it is still very potential to change to a single rocket launcher, and it is simply invincible to support infantry within a direct aiming distance, if it is fired in a group, although it is not as shocking as the Type 63 107 gun, but it is light, and it has a miraculous effect on dealing with the enemy's infantry group or blocking the cavalry charge, and it can be regarded as a heavy weapon in the support fire. He was already satisfied with this in his heart, and finally had a near-modern weapon of mass destruction. It was just to knock the arrogant Jiang Tian that he pretended to be unhappy.

The reason why Jiang Tian felt that he had failed was because he set the performance of this weapon too high. In his original expectation, this should be an artifact that can fly four kilometers with a kilogram of columnar compressed fire @ explosives @ charge, and even if only two or three hits are fired at the battleship, it can cause serious damage to the personnel and the hull, but now that I look at it, I feel like a chicken rib.