After combining all the factors that can be imagined, Zhao Yu stayed up until midnight to complete the overall design of the chariot and draw the sub-drawings of each part one by one. After sleeping for two hours, the wake-up call sounded, and he rushed to the school field to exercise after a simple wash. Today is not bad, Zhao Mengjin has already led a group of officers from the division to line up to wait, and Chen Fenglin has led the officers of the first army to go out without asking.

"How long has it been since Zhao Zhi's envoy had been out of the exercise?" Zhao Yu has been following the morning exercises of the guard battalion, and the subjects are no different, first running for ten miles with light equipment, followed by physical fitness and queue training, and the intensity is much greater than that of other troops. When he was over, seeing Zhao Mengjin sweating profusely and panting, he raised his arm and wiped the sweat on his face with his sleeve and chuckled.

"Subordinate...... My subordinates haven't had morning exercises for more than a month! Zhao Mengjin was silent for a long time before he spoke.

"Hehe, if you don't for a month, your belly has grown so big, it seems that the food is good!" Zhao Yu smiled and didn't blame, but reached out and pulled down his belt, and there was only one eye left in the buttonhole, and then patted his stomach.

"The subordinates know that they are wrong, and they will abide by the military rules in the future, and they will never dare to slack off again!" Zhao Mengjin saluted, he knew that the little emperor was familiar with military affairs, and his words could not be concealed, so it was the royal way to admit his mistakes quickly.

"As the first official, you should be a role model. If you slack off for one point, you will slack off for three points below, one of them; In addition, wars are frequent, and you neglect training, so you can't walk on the road or ride horses, so how can you lead the troops? I'm afraid that if I lose, I can't run! Zhao Yu pointed at Zhao Mengjin and Chen Fenglin, and then nodded at the subordinates behind them whose legs were still trembling.

"The subordinates will strictly follow His Majesty's teachings, and they will be strictly disciplined in the future!" Zhao Mengjin peeked at Du Yuhou beside him, his face was pale, his body shook straight, and he gritted his teeth and promised.

"One soldier bears, one bear. Look at the pigs you eat one by one, and you can imagine what kind of team you will bring out! Zhao Yu raised his face and said loudly, "I tell you that from now on, officers and civilians at all levels will also participate in the assessment, and if they are not qualified, they will all be forced to retire, and they will not be merciful." ”

"Yes, my subordinates keep in mind Your Majesty's lesson!" Zhao Mengjin is also a senior general who commands more than 100,000 forbidden troops, and was reprimanded by the little emperor in front of all the soldiers.

"I didn't hear it!" Zhao Yu said sharply again.

"The subordinates will keep in mind the lessons of His Majesty!" Zhao Mengjin felt that his face was lost today, and he glared at the subordinates around him fiercely and shouted loudly.

"Disband!" His side was not disbanded, and wherever the other departments on the school field dared to move, they all stared at the little emperor who was angry there. And Zhao Yu seemed to be satisfied at this time, sighed and waved his hand helplessly.

"Disband!" Zhao Mengjin turned around and ordered loudly. At this time, the troops lined up and left with the sound of the first-level password, but there was no noise except for the footsteps, and everyone could see that these bigwigs were very unhappy, and it was best not to cause trouble.

When the army dispersed, Zhao Yu walked directly to the well, washed his hands and face, rearranged the army's appearance, and walked to the direction of the canteen to eat. Zhao Mengjin could only smile bitterly and follow behind to accompany the little emperor, but Chen Fenglin ran to the canteen with a smoke, and asked people to quickly prepare to set aside a table for His Majesty, and told the fire army not to be special, and his own food should be the same as that of ordinary soldiers......

"Your Majesty, the baggage camp is ready, and your subordinates will accompany Your Majesty!" Eat silently, sleep silently. It is not only the fashion of this era, but also the regulations of military discipline, the little emperor eats to maintain the habit of the army, in the blink of an eye, a bowl of gruel, three steamed buns have been eaten, and then he finished brushing the bowl and left, Zhao Mengjin hurriedly caught up with the road.

"I'm afraid I'll have to stay here for a few days this time, don't you have military affairs if you accompany me every day?" Zhao Yu walked as he walked.

"Your Majesty laughed, how could his subordinates not have military affairs, but worried that His Majesty would have something to summon." Zhao Mengjin said.

"Just leave someone to join the army to accompany me, I don't need you to accompany me." Zhao Yu said expressionlessly, "Could it be that you don't have confidence in the army you belong to, and you're worried that I will be in danger?" ”

"Of course not, all the armies of Jiangdong are loyal to Your Majesty from their subordinates down!" Zhao Mengjin hurriedly spoke.

"In that case, why do you have to stay with me all the time?" Zhao Yu stopped and twisted his face.

"This ......" Zhao Mengjin really didn't know how to answer, yes or no, he didn't say it for a long time.

"You really don't have anything to do with the guys. Today, I just reprimanded you in public, that is, I trained them all to death, and no one dared to fart! Zhao Hao smiled and whispered in his ear.

"Well, my subordinates understand!" Zhao Mengjin smiled evilly when he heard this, and the depression in his heart was also swept away, and he was about to retire after making a salute.

"Remember to find me someone who is smarter, don't grind!" Zhao Hao hurriedly emphasized.

"Your Majesty, rest assured!" Zhao Mengjin couldn't hide his excitement and said......

Although Zhao Mengjin was very confident in his own people, he still chose a relatively closed place and let the little emperor start work there. And Zhao Yu was much more generous, leaving only two guards to serve by his side, but he also knew that those guards must be watching nearby, and if anyone moved, he was afraid that the first one would be shot.

The baggage battalions were staffed with military craftsmen, who were responsible for repairing damaged weapons and camp equipment, and also repairing fortification or siege equipment during wartime. When Zhao Yu arrived, they all prepared the tools and materials according to their own ideas, and he didn't talk nonsense, hung up the drawings he had drawn, explained them first, let them roughly understand what they were going to make, and then distributed the parts drawings to the corresponding craftsmen, so that they could make them according to the size and style, and he was responsible for explaining and inspecting.

The chariot designed by Zhao Yu adopts the style of a four-wheeled van, with a length of six feet, a width of eight feet, a height of eight feet, and a height of six and a half feet. Because the steering frame is installed to achieve single-axle steering, the wheels are small in the front and large in the rear. The size of the wheels determines the ability and stability of the vehicle, and it is impossible for you to pick a flat place in the wilderness to line up, let alone always drive on the main road. Therefore, it is necessary to choose large-size wheels, and choose a rear wheel with a diameter of five feet and a front wheel with a diameter of four feet.

In this era, it was not possible to use rubber tires for wheels, and wooden wheels were usually used and reinforced with iron blades. The first thing about a chariot is to be strong, especially the wheels, and the wooden wheels are more likely to be damaged in the field, and if they are in the middle of the road, they will be in great trouble. Therefore, Zhao Yu used iron spokes and wheels with wooden strips inlaid on the hub, so as to reduce the weight as much as possible on the premise of ensuring sturdiness.

For the carriage of the chariot, Zhao Yu did not adopt the bucket-shaped style of the Hussite chariot, but the traditional square shape, with an isosceles trapezoidal roof section. In order to be able to add auxiliary guards, he changed the wheels to a built-in type, so as to avoid friction and collision between the guards and the wheels. And it can reduce the width of the vehicle, enhance the passability, and also improve the survival rate on the battlefield.

Everyone knows that the lower the center of gravity of the vehicle, the better the stability, and the modern racing chassis is eager to stick directly to the ground, which is the result of the pursuit of stability. The large size of the wheels inevitably raised the carriage and shifted the center of gravity upward, while Zhao Yu adopted a sunken carriage in the design in order to take into account both passability and stability. This not only solves the problem of the center of gravity being too high, but also increases the height of the cabin, improving the volume and the comfort of the occupants.

On the premise of ensuring that the occupants can stand upright, Zhao Yu transformed the sinking part into a storage box to hold the crew's personal equipment and reserve food and drinking water, so as to improve self-sustaining power and activity space. Since he was an expert in this area, he naturally managed to make use of all the space, and the driver's seat was certainly not spared, and was converted into a storage box with two axes, two shovels, two pickaxes, two hoes, and a set of repair tools.

For the box of the carriage, Zhao Yu chose a pine board that is resistant to corrosion and has a reasonable strength and price, considering the power of the current bow and crossbow, the three-inch wooden board defense is sufficient. Therefore, in addition to the bottom plate, the side compartment and the top plate are all of this size. The most creative thing is the 'wing' structure adopted by the left and right compartments of the carriage, that is, the two compartments can be lifted as a whole, like open bird wings. In this way, it is not necessary to consider the direction of the vehicle in wartime as in the case of the partial van, and the height of the roof can be increased when the compartment is lifted, which is convenient for dispersing the smoke generated when the firearm is released.

In order to facilitate firing, five shooting holes were opened in each side of the compartment, the height of which was just enough for the gunner to shoot in a standing position. The lower position on the carriage on both sides of the board is designed with foldable chairs, so that the occupants can sit down when driving and reduce fatigue. The width of the car also allows the soldier to lie sideways and stretch his legs, so that he can sleep comfortably in the car without having to sleep in a tent. In addition to designing a small door similar to that of the Hussite chariot on one side of the compartment to facilitate the crew to get on and off, he also left a flap on the bottom plate for escape and attack enemy troops.

The driver's seat is naturally in front of the car, which is convenient for them to observe the road conditions ahead. And in order to protect their safety, not only are the guards installed on both sides, but the roof of the car also sticks forward, providing them with shelter from the wind and rain, and at the same time, it can also protect them from the sky.

Although Zhao Hao has taken into account all the conditions that the chariot should have and the combination of man and machine, what he is most worried about is the weight of the chariot. This is by no means a simple matter of packing more or less things, but it involves a lot of problems. First of all, the vehicle is too heavy, the traffic capacity is limited, and it is easy to get stuck on the soft road, which will not only reduce the marching speed, but also have to consider the marching route. It is even more troublesome to encounter a river, and it is necessary to think about the bearing capacity of the bridge, and further reinforcement should be carried out when the bridge is built.

Then there's the issue of traction. According to the prevailing algorithm, the dragging force of a horse for long-distance walking is equal to its weight, and the range of horses that Zhao Hao can choose is very narrow. At present, he could not get his hands on heavy horses from Europe and Siberia, and the Guangxi and Dali horses were too small to do the job, so they had no choice but to use Mongolian horses.

The weight of Mongolian horses is roughly between six and seven hundred catties, and the traction force is about six hundred catties. If you use two horses, you can drag about ten stones, and the use of four wheels can be improved, but it is not too high, so that the body is too heavy, and the load capacity can only be reduced accordingly. And this is not only a matter of increasing the number of horses, knowing that one horse consumes more food per day than five people, which increases the pressure on material supplies, that is, it is necessary to use several times the consumption to increase the volume of transportation. Therefore, Zhao Yu required that every component installed on the car should be weighed and recorded, so that improvements can be made accurately.

Everyone around Zhao Yu knows that when he tries to make new objects, he has never been stingy with money. However, he did not offer a heavy reward this time, but he also paid for all the participants to improve the food, and the big fish and meat were full. The soldiers of the baggage battalion were also proud to work with the little emperor, and two days later, with their joint efforts, the first prototype car was made.

It can be said that the prototype car basically met Zhao Yu's design requirements, but it was also overweight as expected. He was designed on the premise that a chariot could carry a combat crew of fourteen to seventeen men, including fifteen musketeers and two pilots. Calculated that the crew and their carry-on equipment alone are 1,500 catties, and the two horses will definitely not be able to tow it, so only four horses can be selected for traction. But even so, the weight of the car is very reluctant, let alone carrying more baggage.

Zhao Hao could only make up his mind in the car, and he found that the heaviest part of the car, in addition to the wheels and axles, was the body frame. Don't think about the idea of the wheel, and he knows that the strength of the iron pipe and the solid iron column of the same diameter is the same, that is, the bearing capacity is the same, but not only the material is saved, but also the weight is reduced.

As a result, the axle was turned into a hollow iron tube, and the bottom frame and floor were made of bamboo, which was as tough and strong as or stronger than wood, thus reducing the weight of the car body. But Zhao Yu was still not satisfied, and the idea could only be on the board. This problem is very tricky, and if the protection is weakened, the gains outweigh the losses. But it was difficult for him, and after the test, he chose the sandwich structure of the carriage plate.

The outermost layer is still made of pine, but the thickness is only one inch, the middle is made of straw woven straw mat, which is rolled to increase its strength and reduce the thickness, and the inner layer is clamped with wooden planks less than half an inch back. This not only reduces weight, but also reduces costs, after all, this is a rice-growing area, and straw is basically useless except for fire.

With Zhao Yu's unremitting efforts, the weight of the car was finally reduced to 700 catties, a total of 500 catties. Don't underestimate this weight, if it is changed to food, it will be enough for a truckload of people to eat for a month, and if it is replaced with gunpowder and buckshot, it will be enough for them to fight a battle......