Because what Li Su wants to display is quite cumbersome and it is not convenient to move it into the house, Li Su invites Guan Yu and Ma Chao to go to the school for inspection.

The three of them left as soon as they said they could go and came to the school grounds. Li Su walked very quickly, and even the bodyguard Dian Wei didn't say that he was Guan Yu on the left and Ma Chao on the right. He was in his own city, so what else could he bring to his guard?

Within a few minutes, he arrived at the temporary military camp in Lintao City. A Li Su's aide came to welcome him. Li Su gave a few instructions, and the man immediately prepared and guided Guan Yu and Ma Chao.

Guan Yu followed behind, looking at Li Su's new aide, narrowed his eyes and whispered: "Boya, where is your new disciple and aide? I see that he has a habit of martial arts in every move. I'm afraid he is not a bandit, but a serious scholar?"

Li Su smiled slightly, and couldn't help but remember the scene when Guan Yu first met Dian Wei. That time, Dian Wei was wearing a hat to cover his face, but Guan Yu saw at a glance that he was a desperate person in the martial arts world, who bought people for revenge.

Guan Yu had already fled to the world before following Liu Bei and had been in the world for five or six years. Now he has been whitewashed for twelve years, but he has not forgotten his old experience in the world.

Li Su: "This man's name is Xu Shu. He was originally a scholar from Yingchuan. He did commit a murder and went into exile in the world. Last year, he went to Yan Xiang, Huang Chengyan to Hongnong. After Yan Xiang was defeated by Yan Xiang in the imperial court, the scholars forced by Yuan Shu saw the king's rule and were curious for a moment and traveled to observe. By chance, I saw that he had a talent in military dispatch and his talent was okay. If he took him to do something, he might be able to join the army."

This time Li Su went north, of course, and of course he would also bring some staff. Many of the employed people he raised last year have come, and this time it is also a good opportunity to make a fortune.

Guan Yu didn't say anything. He just kindly reminded him, afraid that Li Su wouldn't see that the other party had a background in the martial arts world and was deceived. Since Li Su knew it would be useful, it must have a reason.

From Guan Yu's own standpoint, he is also a gangster. He does not discriminate against people in the world. As long as he speaks it openly and honestly, he should not dare not admit his past.

The group was soon led by Xu Shu and first saw a car that was very huge in the eyes of people today.

The shape of this car is a bit similar to the denim caravan in the western film. It has four wheels and is very narrow and long. The wing plates at the front and rear ends are also erected outwards, similar to the shape of the bow and stern.

There is no doubt that Li Su was inspired by his understanding of the "Western Development" in the United States when he was in school, and also thanks to the common sense experience provided by Red Dead Redemption games.

The length of the car is more than two and a half meters (near six meters) and six feet wide (one meter three). The wing plate next to the car is four and a half feet high, but because there is a wheel axle and half a wheel at the bottom of the car and the wheel diameter is also six feet, the upper edge of the car is more than seven feet high.

If an ordinary soldier stands next to the car, unless he is an eight-foot-tall man, he will not be able to see the car in the car, let alone use melee weapons to kill and stab the people in the car. If he encounters a cavalry melee, the cavalry is on the back of the horse, and his shoulders are about ten or two feet high. At this time, as long as the people in the car stand up, they are basically the same height as the cavalry.

But these are not the key yet. In the eyes of Guan Yu and others in the late Han Dynasty, the strangest thing about this car is why it is necessary to build such a narrow and long car, and it has to be made with four wheels, making it very difficult to turn. And the baffle is so high, is it just to sit in the car and fight? Don’t you think the car itself is too heavy and waste transportation capacity?

Guan Yu walked closer, touched the wooden board of the car, and it was actually one and a half inches thick (four centimeters). After estimating the weight, he couldn't help but shake his head:

"This car is afraid that it will have 2,000 kilograms of wood in the carriage. It will waste load. If the wooden board is thinned by half, reduce by 1,000 kilograms and load an extra 1,000 kilograms of grain and supplies, wouldn't it be nice? Moreover, there is no need for the carriage to surround the carriage on all sides. This will be troublesome when unloading. At least it will be left without surrounding the carriage, just push the carriage up and down. Now when you unload, you have to carry four feet high before turning it out. This is a waste of energy to the soldiers.

Boya, I roughly know what you want to do. After all, we tried to break the chariot formation and defeat the cavalry as early as when I was suppressing Zhang Chun in Youzhou, and we also saw Que Yi's first camp fighting. Que Yi was also a famous general from Xiliang and had a good deal of dealing with cavalry. I think you just want to use the chariot to assist a small number of crossbowmen in the convoy to defend, so that even if you encounter several times the Guo Si cavalry robbed grain and set fire, you can successfully defend it. So the car was made strong and thicker, and the chassis was also raised.

But I have been here for several months and have been discussing with Bo Qi, and I have also noticed some problems. The Xiliang cavalry is taller than the Youzhou cavalry, and they also like to sprint with long spears. It is not as good as the Youzhou cavalry likes to sprint with Zilong and Gongsun Zan. Guo Si's tactics are more similar to not fearing losses and facing a few waves of arrow rain, and then rushing to the front to sprint and kill. No matter how strong these cars are, it is okay to block the strait arrows of the cavalry, but nothing else is useful."

Li Sujing waited for Guan Yu to express his opinion, and then smiled and said, "Chang Yun, you have misjudgments. Do you think my car is so high and heavy, just to defend against archery rain, and it is useful in wartime? In fact, even if you don't encounter an enemy, it's purely for transportation. This car is much more cost-effective than the light car you mentioned. I'll ask you, how many stones can a light car pulled by a cow now? Where are the two cows?"

Guan Yu took two or three seconds to twist his beard and replied based on his experience: "A ox light cart will pull fifteen to twenty stones, and two ox carts will be at least forty stones."

Li Su proudly revealed the mystery: "Don't pay attention to this car, four-ox pulling cart can carry a load of 100 stones! Traveling 60 miles a day! If it is changed to a six-horse pulling cart, the load will remain unchanged and can travel 80 miles a day! I did an experiment when I first arrived at Dazhong."

The reason why this kind of car is so bulky is that it can still carry so much cargo (about 15,000 to 17,000 kilograms, equivalent to four tons), and the unit of livestock cargo volume increases by 20% or 30% because four-wheelers save a little animal power than two-wheelers. The car itself can stop steadily and there is no need to put heavy pressure on the shoulders and backs of cows and horses. The cows and horses just need to use force forward.

There is nothing much to say about this. Li Su went directly to the experiment and asked the car to pull 17,000 kilograms of goods. He dragged it with four cows. Guan Yu saw the real effect. After thinking about it for a little, he had a rough idea of ​​the labor-saving effect of the four wheels.

The disadvantage of the four-wheeler is that the steering is not good, and Li Su did not make the steering mechanism for the car, so the mountainous states like Yizhou are definitely useless, but Xiliang is a large Gobi desert with a flat horse. It is originally a direction that does not need to turn around without turning any way, so this disadvantage doesn't matter.

Guan Yu slowed down for a while and said sincerely: "Four wheels are indeed labor-saving, but you haven't said why you need to install the front panel to prevent loading and unloading. The thinner wooden boards will save animal strength and transportation capacity. We must strive for excellence, and we cannot be better than two-wheeled vehicles and achieve two or three-year satisfaction."

Li Su smiled proudly, but did not explain, and first directed Xu Shu with a folding fan: "Yuan Zhi, ask the soldiers to push the car into the pool."

There was really a pool on this school ground in Lintao City. When Guan Yu came just now, he passed by. When he saw it, he felt a little strange, but he didn't think much about it, thinking that Li Su was drinking horses.

But at this moment, when he saw Xu Shu slowly pushing the car into the water along the slope, the car was already full of tests, loading more than 10,000 kilograms of goods. After entering the water, it swayed and floated easily. Under the full load, the side of the car panel was half a foot higher than the water surface.

There is no doubt that Li Su dared to hold 17,000 kilograms of goods, and the whole car weighed more than 2,000 kilograms, so he must leave more than 20,000 kilograms of reserve buoyancy for the car according to Archimedes' principle.

The car is six meters long, one meter wide, three heights, and no theoretical displacement of seven to eight cubic meters is allowed. 20,000 kilograms are only five tons, and there is still two or three tons of buoyancy margin.

The wooden board is so thick that it is not only for covering crossbows during wars, but also for fear of crossing the river during transportation of goods, and the bottom plate is not compressive enough to leak and seep water.

The car would rather sacrifice the convenience of loading and unloading than block it, just to surround it with enough buoyancy space.

The bottom plate of the front and rear of the car must be raised upward to reduce the drainage resistance during amphibious and land use.

In fact, the heavy-duty schooner in American western films also has this advantage, and can be easily passed through the water net. Historically, this car was very popular in the 1820s. The canal construction craze in the United States occurred in the late 1820s, until the entire 1830s and early 1840s. After twenty years of construction, the United States completely connected the Great Lakes region with the 13 states on the East Coast with the canal network.

This heavy-duty waterproof caravan is a great show of its strength before the canal network is built, because it can be used both water and land, and can be transported between two rivers for a period of land. After crossing the Appalachian Mountains from Pittsburgh, it switches from the East Coast water network to the Great Lakes water network to continue moving forward, saving two troubles of "unloading and loading" and "unloading and loading", and avoids preparing two ships, one car, and triple-fold transportation along the way. As long as one transportation is a one-stop stop, no transfer from New York to Chicago.

Later, the canal was completely repaired, and New York could directly reach Chicago. This type of schooner was completely eliminated by canal boats in the central region, but was then adopted by cowboys during the development of the west, and continued to show off his skills. Originally, since the late 1840s, Americans tried to continue to develop more western lands, but as railway technology gradually matured, canal digging companies went ashore to transform and invested in railway construction. Ship-shaped schooner continued to play the role of a pioneer before railway construction, and used both water and land all the way west, solving the problem of "ships cannot move between multiple unconnected rivers."

Of course, Guan Yu and Ma Chao didn't understand these history, so they just felt confused: "You... are you trying to cross the river? Are you driving in the water?"

Li Su signaled Xu Shu to expand a map of the Western Regions, and then signaled Xu Shu to help explain.

Xu Shu was not polite, and pointed at a branch with a branch: "Please see, General Guan, Captain Ma, in the future, we can first march from the tributary of the northern bank of the Yellow River, but after reaching the source of the waves, we have to move further west, so we can only ride horses and pull carts.

But in fact, as long as you pass the edge of Wuwei County and Zhangye County, you will soon see a large river inland, which is Ruoshui. According to the "Book of Han", Ruoshui is 1,800 miles long, from Zhangye, through Jiuquan, and finally reach Juyanze. During the reign of Emperor Wu, General Huo Qubing of the Cavalry arrived in Juyanze for the first time. According to the records left by Huo Cavalry, Ruoshui River can actually be shipped in many places, but because it is located in the Gobi Desert, there are many shallows.

Now that we have changed this kind of car, we can not only solve the problem of "no boats in the weak water basin", but we no longer have to go to Zhangye County to build ships, but we use both water and land. We can drive the Wuwei wave ship as a car to the weak water before going into the water.

Moreover, the weak water was 1,800 miles, and there were more than ten places where the shallows could not be navigated. In previous years, if I had only relied on ships, even if I had built enough ships in Zhangye, I would be blocked by the shallows every 100 miles. Unless a man-powered tugboat passed by the beach, or if I had to rebuild the ship on the other side of the shallows, it would be extremely costly and could not be achieved.

Now, when you encounter a shallow, you will let the fleet go ashore and continue to drag it with livestock. Will it be wonderful? Moreover, the weak water is in Zhangye and downstream into Juyanze, so you can also use the natural thrust of some of the water flow when you take a boat. There is almost no need to consume human and animal power in the river section with a large drop. Livestock just need to follow the boat by the river.

When you encounter a narrow and gentle river surface, let the livestock move forward by the river. If the river surface is really wide and not suitable for the rope, let the soldiers sit inside and row the oars.”

Xu Shu roughly explained the principle of movement of the car and ship, and Guan Yu and Ma Chao were also eye-opening.

Li Suyuan had actually thought about getting the crankshaft paddle wheel and the foot pedals to let the sailor pedals, but in the end he felt that disassembling the wheels and installing the crankshaft above the carriage were too cumbersome, and there were too many extra parts and spare parts to carry, which was too complicated. After the preliminary experiment, it was found that the carriage was too shallow compared to the paddle wheel, and the shaft was too high. People had to lift their legs and pedal, which was very laborious, unless the soldiers who were pedaling the boat were stools and pedaled. Li Su finally gave up all the unfavorable factors.

Because the efficiency of human paddle wheels is not much higher than that of paddle rowing, the advantage is that the strength of a person's thigh is stronger than that of his arms, so it seems easier to pedal like a bicycle.

Standardization and simplification are also important. Taking too much steps can easily cause logistical disasters.

When you can go downstream, you can float downstream. If you can't float, you can pull the fiber. If you don't pull the fiber, then switch to rowing. At least you can drive the ox to pull the ox along the river. At least you can still drive the ox to pull the ox along the river.

Just enough. In any case, it is much more labor-saving than the whole process of ox pulling. The key is that the terrain is better adaptable.

"Boya really knows everything, how can I come up with it for you?" Guan Yu couldn't help but be amazed.

Xu Shu hadn't finished speaking yet, and he was also anxious to show off a tactical application that he thought of later and offered advice to Guan Yu: "General Guan, after using this car, our army can make more favorable adjustments in the future on the marching route of the baggage team, which is thanks to this car."

Guan Yu raised his eyebrows and wanted to see Xu Shu's weight. After all, this was the first time Xu Shu offered his suggestion: "Oh? I hope to hear it carefully."

Xu Shu pointed to the map and said: "When we went west, the Qilian Mountains on the left, the waves and weak water on the right. Because of the terrain, there are often small rivers in the valleys between the Qilian Mountains on the southwest side of the left, and the weak water often flow into the waves and weak water. The source is either the melting water of snow mountains or the rivers on the plateau.

On the right side of the weak water, there is an endless Gobi Desert, and there is no tributary flowing into these rivers. If we do not have this kind of amphibious and land caravan, we must always carry grain along the northeastern river on the right. This will avoid the trouble of crossing a wave after more than a hundred miles and the weak water tributary, so we can avoid crossing the river all the way.

But this also leads to a disadvantage, that is, if Guo Si concentrates light cavalry and robs food from the Gobi direction, our army's reaction time will be shorter. Now our army is no longer afraid of crossing the small river a few more times, so even if we cannot flow along the river section of the river along the river, we must take the land route, and try to choose the left bank on the southwest side and lean against the Qilian Mountains.

In this way, Guo Si had to come to attack the enemy, but his cavalry had to go roundabout to find weak water, waves, and shoals, and cross these two rivers before they could attack our grain team. Wouldn't our preparation time be greatly increased? According to my estimate, unless Guo Si was head-on and was not afraid of swimming in relatively deep waters, he would have to delay at least half an hour to prepare for the grain team that our army was attacked by sneak attacks."

Guan Yu couldn't help but lit up. He, who had fought for twelve years, knew how much difference could there be when the convoy was attacked by cavalry after half an hour. To put it bluntly, the suddenness of the cavalry was suppressed so badly, would he be embarrassed to call a "sneak attack"?
Chapter completed!