The four-wheeled carriage on the first drawing was very beautiful. With the handsome and strong painter, he just took a few strokes and a luxurious and beautiful four-wheeled carriage appeared on the paper.

The four-wheeled carriage on the first drawing was drawn directly from Yan Liqiang's four-wheeled carriage that had an impression in his mind. The spacious and bright carriage carriage, the carriage door that opened the door, the carriage step stool that facilitates passengers to get on and off, the two horse lanterns on the left and right sides of the coachman in front of the carriage, and the top and the luggage racks on the back of the carriage were all vividly displayed on the paper, making people excited at first sight.

Not to mention anything else, because of the unique characteristics of the four-wheeled carriage, the carriage is as spacious as a house. Compared with such a four-wheeled carriage, all the two-wheeled carriages in the entire Han Empire, even the "luxury car" given to him by Yan Liqiang when he returned to Ganzhou from the imperial capital, was instantly extremely simple. It is no exaggeration to say that the comparison between the two-wheeled carriage and the four-wheeled carriage is simply a comparison between a motorcycle and Maybach.

Qian Su opened his mouth wide in shock. After looking at the first picture a few times, he looked at the second picture below.

The second picture shows the structure of the four-wheeled carriage. On both sides of the carriage are bright windows. In the carriage, there are two seats that are as spacious as sofas, which look extremely comfortable. Even though Qian Su has never sat in such a carriage, he just took a look and was attracted by this design.

Due to the limitation of the space of the carriage, it is impossible for all two-wheeled carriages to move such comfortable seats into the narrow and narrow space. The two-wheeled carriages in the entire Han Empire were small stools or wooden boards fixed in the car. The so-called luxury was at most just a little fur on the benches and wooden boards. Some women's carriages were specially designed for comfort, and they could directly put a soft collapse that could be lying down and sitting cross-legged. In terms of comfort, they were naturally not as good as the painting Yan Liqiang painted on paper.

"Is this... a four-wheeled carriage?" Qian Su looked at the two drawings, then looked at Yan Liqiang, and a look of surprise flashed in his eyes.

"Yes!" Yan Liqiang said with a smile, "Isn't this obvious at a glance?"

Qian Su smiled bitterly, "I have to say, Li Qiang, you really draw it well, but this four-wheeled carriage is not good at all. If the four-wheeled carriage can be made so simple, the people running around the world will probably be four-wheeled carriages!"

Yan Liqiang asked knowingly, pretending to be curious, "Oh, I don't know why this four-wheeled carriage is not easy to build?"

"It is actually very simple to make it, but the practicality of this four-wheeled carriage is not strong. Why not? It is because the four wheels of the four-wheeled carriage are fixed on the body of the carriage. Once you walk, you can't turn at all!" Qian Su pointed to the four-wheeled carriage drawn by Yan Liqiang and said, "So now there are two-wheeled carriages all over the world, because the two-wheeled carriage can be easily turned on the road, and a driver can control it. I heard that the four-wheeled carriage is in the Imperial Capital City, which is the emperor's throne, but the emperor only takes a few times to sit on the straight official road, and he has to walk for a long time. If you want to turn around, you have to make a lot of people to toss and untie the horses and lift the carriage. It's too troublesome..."

“What if I could solve the steering problem of the four-wheeled carriage?”

"Ah, how is that possible..." Qian Su said habitually without thinking...

Yan Liqiang smiled and handed Qian Su the third sketch he drew. What he drew in the third picture was the structural diagram of the bogie connected to the front and rear wheels of the bottom of the four-wheeled carriage.

As soon as he saw the picture that Yan Liqiang took, Qian Su's eyes widened instantly. After a few seconds, his hands holding the picture were trembling slightly excited.

Seeing Qian Su's appearance, Yan Liqiang sighed. The principle of the four-wheeled carriage is actually not complicated. It is just a layer of window paper. As long as it is pierced, everyone can understand it at a glance. The four-wheeled carriage that Qian Su mentioned before cannot be turned because everyone habitually installed four wheels on the same fixed frame. Therefore, it is very difficult to turn such a four-wheeled carriage and is not very practical. In his previous life, there were four-wheeled carriages in the famous ones, but that kind of four-wheeled carriage was a load-carriage pulled by a cow. All the turns were completed by several cows pulling the car in front with their strength. Such four-wheeled ox carriages were used even in rural areas in China before liberation.

To solve the steering problem of four-wheeled carriages, it is very simple. Just break through the limitations and inertia of thinking, install the front and rear wheels on two different frames, and then connect the two frames together with an upright hard shaft. In this way, the problem of four-wheeled steering can be easily solved, which is the bogie of the carriage.

Yan Liqiang had thought about making a four-wheeled carriage before, but at that time, the conditions were not yet mature and it was not very meaningful to do it, so he didn't do it. This time, on the way back to Ganzhou, Yan Liqiang had been bumping tens of thousands of miles in the two-wheeled carriage, and he finally learned from his mistakes and decided to get out the four-wheeled carriage to benefit the people of the world.

Food, clothing, housing and transportation are the most profitable and demanding businesses. Once this four-wheeled carriage is made, Yan Liqiang will never doubt that it will be popular all the world. As the creator of the four-wheeled carriage, even if he cannot monopolize all four-wheeled carriages, with his fame, as long as he occupy the highest part of the four-wheeled carriage, there will be a steady stream of profits and money coming towards him. At the same time, he can also cultivate his own power.

In addition, the biggest advantage of four-wheeled carriages compared to ordinary two-wheeled carriages is that they have a strong load capacity, which can greatly improve the carriage carrying capacity. This four-wheeled carriage is of little significance to a person. However, for a country like the Han Empire that mainly relies on land to complete the circulation of goods, this has extraordinary significance. The convenience and efficiency of goods transportation on land will be convenient and efficient. First of all, the logistics and transportation costs of goods will be reduced, and the circulation and migration of goods and personnel will be conducive to the large-scale circulation and migration of goods. In this way, commerce can be greatly developed. The development of commerce and handicrafts will also develop and prosper. The improvement of production technology will also have demand and motivation, which will bring a series of changes...

Of course, if you want to build a high-end four-wheeled carriage, it is not enough to have a carriage bogie. Others can tell how to do this bogie at a glance.

So, Yan Liqiang then handed Qian Su a picture. On the picture, Yan Liqiang designed a coil spring for shock absorption at the bottom of the carriage and the rear axle connection...

"What... what's in this circle?" Qian Su asked in shock as he looked at the picture.

"This thing is called a spring!"

"Spring..." Qian Su repeated it, obviously still a little confused about what the spring is, "What's the use of this thing?"

"It can be soft and hard, big and small, stretch and shrink..." After saying this, Yan Liqiang suddenly reacted, "Ahem, Uncle Qian, don't think so wrongly. This thing is used to dampen the carriage during driving and increase the comfort of the carriage. You will know when it is built!"

Qian Su laughed, "Do you know how to make this thing?"

"Of course!" Yan Liqiang looked at Qian Su seriously, with a look of memories on his face, "I had another dream a few days ago. In that dream, the old fairy grandfather who once taught me how to save people taught me how to make springs!"

In an era without springs, springs are definitely "high-tech" products. Moreover, because of their special production technology, Yan Liqiang can completely control the production process of springs in his own hands, so that others can see but cannot create them in a short time. Therefore, it can widen the gap between the four-wheeled carriages they produce and the four-wheeled carriages produced by others, and establish the status of the "luxury carriages" produced by the Ganzhou Manufacturing Bureau in this era...

The Rolls-Royce among the four-wheeled carriage produced by Yan's is not a dream...

Qian Su suddenly looked at Yan Liqiang eagerly, "Liqiang, I beg you for something?"

"What's the matter, Uncle Qian?"
Chapter completed!