"Hey, this thing looks complicated, but the principle is very simple, just parallel lines, it is just a little more complex in implementation..."

"Just like children are punished to write and want to be lazy, they hold two charcoal pens in one hand and can write two lines of words at the same time..."

"The principle is simple, but it is not simple to implement. First, there must be a linked multi-link structure, and secondly, it must ensure that the movement of the latitude and latitude can be synchronized..."

"The British Duke has fantastic ideas and strong hands-on ability. He has been thinking about it for many years and realized this idea. Although it is a bit troublesome to use, it is also an amazing breakthrough. Therefore, this copy machine... no, the tracing machine is of great use."

At this time, the night was late, and Yuwen Wen introduced the beauty of the tracing machine (also known as the copying machine) to Yuchi Chifan in his bedroom.

Although Yuchi Chifan couldn't understand the mechanical structure, it did not prevent her from listening carefully.

In the afternoon, Yuchi Chifan said a lot to the prince. Now it was her turn to listen to Yuwen Wen's endless explanation. As she listened, she felt that she couldn't quite understand the principle.

But she also understood a little, that is, once this device is used in large quantities, it can not only copy various calligraphy and paintings "perfectly", but also "copy" many engineering drawings, and then "produce plates", and then large-scale printing is followed.

The lower the cost of obtaining knowledge, more and more people will learn and master knowledge. Yuwen Wen now has an idea to "trace" a large number of existing engineering drawings, make plates, and then publish them.

These "projects" include construction, water conservancy, machinery and other industries. When "standard drawings" are published in large quantities, they are of great significance to promoting the technological development of related industries.

Since ancient times, most craftsmen's skills have been passed down from father to son and master to apprentice. For craftsmen, these techniques are the key skills of making a living, and are generally not easily passed on. It is easy to cause the inheritance of many technologies to be suddenly interrupted due to various accidents.

If the court can adopt a more reasonable policy, "buy" the knowledge that craftsmen rely on for their livelihood, sort and summarize it and then publish it, this situation can be effectively avoided.

The inheritance and development of technology requires a large number of people with professional knowledge and literacy. However, the children of nobles who came from a general like the "big engineer" Yuwen Kai who likes to study engineering technology are always a minority. Not anyone else has the conditions for Yuwen Kai to learn engineering technology knowledge.

Yu Wen Wen felt that if a basic and complete technical training system can be established and various types of technical personnel can be systematically trained, it will be a kind of academic and political education that will benefit later generations. If the cost of learning technology can be greatly reduced and the income of technical personnel can be increased, the Central Plains will inevitably usher in an era of great technological explosion for decades.

This requires a lot of foundation to be laid, and the emergence of tracing machines has greatly facilitated the "copying" of various hand-drawn engineering drawings, which is of great significance.

Therefore, Yuwen Wen was willing to take out the "Preface to the Lanting Collection" for Yang Ji to "consider".

Seeing Yuwen Wen's excited look, Yuchi Chifan was also happy. She didn't care how important this tracing machine was. As long as Yuwen Wen was happy, she would be happy too.

She knew that Yuwen Wen was not trying to teach her anything, and she also knew that Yuwen Wen knew that she didn't understand very much, but the other party still liked to communicate with her in this way, or when she was in a good mood, she played the pipa song with strange tone and let her be the listener.

My husband actually wanted to share the joy in his heart with her. This feeling of being needed made Yuchi Chifan feel very warm.

To a certain extent, she is Yuwen Wen's "soul" and all Yuwen Wen's yearning for a better life in the future will "play" for her.

While the couple was talking, Yu Wen Wen used this device to "draw" a set of gear design drawings, and the completion rate reached 70% to 80%. Yuchi Chifan found that the picture looked familiar.

"Is this... Could it be the gear set that the prince mentioned today... the gear box structure diagram?"

"Yes, this device is amazing, and now it's finally progressing!" Yuwen Wen saw that his beautiful prospects of "playing" had a "meaning" and immediately changed the topic.

"I said before that the combination of gears is extremely charming when rotating. The gear box is a relatively complex combination of gears. The key to the propulsion of the ship propeller is the gear box."

"The gearbox needs to achieve 'speed change' and 'enlarge' the output speed of the steam boiler. This involves a technical parameter called 'speed ratio', which the prince should tell you."

"Uh...ah...yeah..." Yuchi Chifan was a little embarrassed. It was obvious that she didn't remember her son Yuwen Weicheng's introduction to the gearbox.

Seeing this, Yuwen Wen explained that he wanted to explode instantly: "The speed ratio is the speed ratio, to be precise, the speed ratio between the gears..."

He began to pick up his pen and draw sketches on the white paper, and Yuchi Chifan watched them seriously.

But Yu Wenwen drew several sketches of gear combinations and devices, and began to explain what the speed ratio of gear sets is.

"You know the principle of leverage. Gear sets composed of gears of different diameters can also form lever systems, either saving effort or saving distance, and the gear set can also change the speed..."

"You see, the gear coaxial to the steam engine drive shaft is called the driving wheel, and the gear coaxial to the driving wheel and the propeller is coaxial to the driven wheel..."

"The driving wheel has forty-eight teeth and the driven wheel has twelve gears. Then, when the driving wheel rotates for one round, the driven wheel has rotated four rounds..."

"What does this mean? It means that the speed of the steam engine transmission shaft is amplified four times after being driven by this gear set. For example, the driving wheel is twenty revolutions per minute, and it is transmitted to the transmission wheel, and the speed of the transmission wheel is eighty revolutions per minute."

"The transmission wheel and the propeller are coaxial, so the propeller's speed is 80 revolutions per minute. In this way, the steam engine with slow transmission shaft speed can also allow the propeller to rotate quickly."

Hearing this, Yuchi Chifan became interested: "So, don't the propeller in the model ship rotate very quickly, but how can I push the steam engine in the model onto the large ship?"

"This question is good." Yu Wenwen drew several more sketches: "The thrust of the propeller is related to the rotation speed and also to the size of the propeller."

"The propeller of the ship model is only the size of a fingernail and is very light in weight. The real marine propeller to be installed has at least a diameter according to calculations."

Yuwen Wen compared Yuchi Chifan's neck with his hand: "From the feet to a person's neck, it's probably that high."

"This kind of propeller has four blades. In order to ensure durability, it must be made of fine iron. For example, it is made of model casting. The weight is definitely not light. The steam machine needs to drive the heavy propeller. Even with the help of the gearbox, its output must be large enough."

"The power required to make a paper windmill rotate a hundred times a minute and a steel propeller weighing hundreds of kilograms is very different."

"If the steam engine needs to be strong, the gearbox must be durable. The amplification of the speed ratio depends entirely on the gears. If the gear teeth strength is not enough and it is easy to be damaged, then the entire gearbox will not be able to operate normally and cannot play a role in speed increase."

"The best way to use gears to be durable is to use a lot of materials. However, the more material the gear is, the heavier the gear, the more difficult it is to rotate. Then when the steam engine drives the propeller to rotate, it will have to consume additional power to rotate the gears."

"The power of the steam engine is very valuable, and you can save as much as you can. Therefore, solid gears are not good. They must be properly hollowed out to reduce weight, but while effectively reducing weight, you must also ensure strength, which is also a technical difficulty."

Yuwen Wen talked a lot, because he tried to use simple words to describe the principle, so Yuchi Chifan could roughly understand and listen to it.

In fact, she doesn't care about "propeller propeller", but she just likes this way of getting along.

Only in this way can she become Yuwen Wen's "soul-hearted person" and become the person needed by the other party.

Yuwen Wen also enjoyed the feeling of "popularizing science" to his wife. He continued to talk and began to imagine the future:

"Winter is approaching now, and the 'project team' led by the prince has made a breakthrough now. The propeller is advancing, and the days of practicality are getting closer."

"Maybe, in a few years, the paddle wheels of the steamer can be replaced with propellers, so that the ship can move faster."

"The paddle steamer on the Yangtze River has sailed against the current for twenty miles per hour. If it is changed to a propeller, the goal is to reach at least forty miles per hour. By then, from Guangling to Jiangling, there will be more than two thousand miles of water, and it will arrive in five or six days, and the water will be faster."

"At sea, the waves are large, the paddle wheels are prone to damage, and the propulsion efficiency is not high, but it is different with propellers."

"So, in the future, there will be not only propeller-propelled inland boats, but also propeller-propelled sea boats."

Yuwen Wen took out the map, held his beloved wife's hand, and sighed: "In the blink of an eye, it has been ten years since the fire ship was born. After ten years of sharpening a sword, the propeller sword was almost sharpened..."

"In the future, with a large ship, we will take a boat into the sea, go to Liaodong, go to Danluo, go to Ryukyu, go to Jiaozhou, and see the great world outside!"

"At that time, while I'll play the pipa to you while watching the sea view on the boat! OK?"
Chapter completed!