"Eh, this ......" Lu Bu was stunned for a moment.

When they were in Helan Mountain, the two were originally mentally prepared to deal with everything, but after they really returned to the state, no one dared to talk about it.

The wolf warrior special forces are all Lu Bu's descendants, and the ghosts and gods have given them a gag order early on, so no one knows about Cai Yan and Lu Bu in Helan Mountain.

But these people do not include Jia Xu, the intelligence chief.

For everyone, Lu Bu had no intention of hiding.

On the contrary, he was also anxious to determine Cai Yan's identity, but their situation was a bit special, and Cai Yong's identity was there.

If it is announced rashly, Cai Yong's face will have nowhere to put it.

Therefore, Lu Bu was never able to find a suitable opportunity to talk about this matter.

And not only Lu Bu, but even Cai Yan himself panicked and didn't know what to do.

After leaving Jia Xu, Lu Bu found Zhang Da.

Although he didn't know how to make machinery, after all, he traveled from later generations and studied history himself.

Therefore, he has a lot of theoretical knowledge and historical innovations, so he has put forward a lot of good ideas and ideas that are in line with the current era.

And with Zhang Da, a super manufacturer, doing the actual production, many of Lu Bu's ideas were realized.

For a long time, Ding Yao often came here to study and help.

Since setting the goal of being a useful person to Lu Bu that time, Ding Yao has chosen this path for himself.

She has been ingenious since she was a child, and she also likes to make some strange and ingenious things.

After worshipping Zhang Da as a teacher under the introduction of Diao Chan, the master and the two sighed that they hated to see each other late.

A celebrity has a long heritage, a talented and open-minded studious, and the master and apprentice are like fish in water in this situation, which makes the craftsman camp go to a higher level.

When Lu Bu came today, Zhang Da and Ding Yao were studying the keel waterwheel.

Keel waterwheel is also known as "overturned", "treadmill", "waterwheel", and the province is called "keel". Because its shape resembles a keel, it is called "keel waterwheel".

Its structure is based on wooden planks as grooves, the tail is immersed in the water flow, and there is a small wheel axle. At the other end there is a small axle, which is fixed to the wooden frame of the embankment. When you step on the crutch, the big axle rotates, and the leaves in the trough are driven to scrape the water and pour it into the higher ground. In later generations, there were water-to-keel cars powered by flowing water, and ox-drawn overturned cars that used oxen to rotate gears. and wind-turned, wind-turned, wind-powered rollovers. Guangdong and other places are lighter with hand cranking, and apply it to the field ditch, which is called "hand crank pulling car".

This device already existed in this era, but it was mostly used in the south, and Lu Bu quoted it and improved it according to some experience and ideas of later generations, and after several days of research and exploration, the master and apprentice made a model, which was being tested at this time.

Lu Bu leaned over and looked at the model of the waterwheel carefully, and praised it as he watched.

"Master Zhang, your craftsmanship is becoming more and more proficient, and this model is really good."

Zhang Da and Ding Yao found Lu Bu at this time and hurriedly saluted.

Zhang Dayi arched his hand and said: "The lord praised it falsely, Zhang Da didn't dare to be ashamed." This model is completely Miss Ding's masterpiece, and Xia Guan is just a handicap. ”

"Oh?" Lu Bu retracted his gaze and looked at the two of them in surprise.

Not long ago, Ding Yao took the initiative to come to the craftsman camp to study, and Lu Bu had known about this for a long time, but he only regarded Ding Yao as a child, and he came here to play mostly, but listening to Zhang Da's tone, it didn't seem to be the case at all.

Ding Yao's head hung slightly, not daring to look up at Lu Bu, and his heart was as nervous as a deer.

She listened to Lu Bu's words in her ears, and she was happy that Lu Bu praised the exquisiteness of things, but she was angry that her works were regarded as the credit of others.

Later, after hearing Zhang Da's words, he was full of shyness, rubbing the corners of his clothes with his two little hands and waiting for Lu Bu's praise.

A smile curved into the corner of Lu Bu's mouth, and Ding Yao's careful thinking naturally did not escape his observation.

For those who have made achievements, Lu Bu has never hesitated to praise them, and he said Ding Yao with joy in a few words.

"When will this waterwheel be ready for production?" Lu Bu asked with concern.

"Back to my lord, there are still some things that need to be improved recently, and it will be improved in a few days." Ding Yao replied preemptively.

Seeing Ding Yao's delicate and cute appearance, Lu Bu couldn't help but smile, rubbed Ding Yao's little head dotingly, and said: "This is the best, this time I came, I just have an idea I want to tell you, see if it can be made in the shortest possible time." ”

Every time he heard that Lu Bu had a new idea, Zhang Da was very excited.

Zhang Da is a workaholic through and through, and after joining Lu Bu, Lu Bu not only gave him the stage to let go and meet all the conditions he needed.

The most important thing is that Lu Bu will pop up some whimsical ideas from time to time, which broadens his horizons and ideas, and makes him feel like he has met a soulmate.

At this moment, hearing that Lu Bu had new ideas, he was naturally very happy.

Who knows, Ding Yao next to him was even more excited than him, jumped up happily, and hurriedly asked Lu Bu to explain in detail.

Ding Yao thought in his heart: Brother Lu Bu has a new idea, I must perform well, so that I can get my brother's attention even more.

After all, Zhang Da and Ding Yao had also worked together for a while, and immediately understood what Ding Yao meant when he saw this.

Smiling slightly, he quietly took two steps back, deliberately letting Ding Yao go ahead.

Lu Bu organized the language and said, "This object is called Quyuan Plow. ”

"Quyuan plow?" Zhang Da and Ding Yao asked in unison.

"That's right." Lu Bu nodded.

In the Eastern Han Dynasty, most of the plows used by farmers are straight ploughs, the characteristics of straight ploughs are that they use straight ploughs, long ploughs, and it is very difficult to turn around, and it is very laborious, two ploughing oxen need to pull at the same time, ploughing cattle are originally a scarce commodity, and if you use this tool to plough the ground, the efficiency is very low.

It was also on Jia Xu's side that he suddenly thought of the Quyuan plough that appeared in the Tang Dynasty and has been used for thousands of years in later generations.

Lu Bu took a brush and explained while drawing on the table.

"Change this place to a curved log, and use a short plow of about six feet." Lü Buxian roughly drew the shape of the zigzag plow, which was completely different from the shape of the plough used today.

Zhang Da saw the difference at a glance and asked, "Lord, this long wheel has been changed so short, how can two cows plow?" And the front of the plough is bent downward, so how can the ploughing ox plough? ”

After Lu Bu glanced at it, he explained seriously: "First of all, the biggest point of this curved plough is that it only needs a ploughing ox to pull it. One of the things is that the nine-foot long wheel was changed to a six-foot short wheel, and some of the weight was reduced. ”

Zhang Da frowned, although the plough wheel was reduced by three feet, the weight of that fraction could be said to be insignificant.

Lu Bu naturally understood Zhang Da's doubts, smiled and continued to refine the sketch, and then pointed to the newly added small parts on the plow wheel and continued to explain.

"The groove on the top of the plough is called the plough evaluation, and the horizontal one is called the plough building, such as advancing the plough evaluation, the plough arrow can be made downward, and the ploughshare is deep into the soil. If the plough is raised, the plough arrow is upward, and the ploughshare is shallow when it enters the soil. The organic combination of plough evaluation, plough arrow and plough construction can adapt to the different requirements of deep ploughing or shallow tillage, and can standardize the adjustment of cultivated land depth, which is convenient for intensive cultivation. ”

After a pause, Lu Bu said mysteriously: "This design also has the greatest effect, it can greatly save effort, you can test this carefully in the future." ”

Lu Bu is a pure liberal arts student, let him answer the mechanics questions in detail, it is better to kill him with a knife is too happy, and quickly change the topic to continue the explanation.

"Removing here, here, and here, all these unnecessary places, and streamlining the whole frame, it can reduce a lot of weight. In addition, the lower plough wall is here, and the shape of the disc is modified to ......"

Ding Yao looked at Lu Bu's serious appearance, and his heart throbbed for no reason, the serious appearance of the person in front of him was so charming.

At this moment, Lu Bu's image in her mind has become more and more magnificent.

But soon, she was attracted by the curved plough newly designed by Lu Bu, and soon she interrupted and asked: "This, this plow wall, why did you deliberately change it to a circle?" ”

The slender jade finger was pointed below the figure that Lu Bu had just drawn, behind the plough shovel that turned over the soil.

Lu Bu smiled and patiently explained: "This plough wall was originally a rectangular shape, which was not conducive to steering, and it was easy to pile up the upturned diagrams, increasing the resistance. ”

After a pause, seeing that the two of them nodded understandingly, he continued to explain again as he drew an enlarged pattern of the plough wall on the sketch.

Here, the shovel is modified into a circle, with a wooden shaft in front, and a circular hollow iron disc is placed on the circular shaft so that it can rotate freely. In this way, because the disc can be rotated, the soil turned up by the plough shovel will naturally fall to both sides due to the rotation of the plough wall, and if there are grass stems and grass roots, etc., the sharp plough wall can cut it, so that a lot of effort can be saved in the process of farming. ”

After explaining for a long time, Lu Bu finally explained the role of the plough wall clearly, and the two of them also suddenly realized at this time.

Lu Bu quietly breathed a sigh of relief, after all, he only knew something about this kind of thing from the records of historical materials, and he had never really seen the specific physical object.

At this moment, let him explain in detail to two people who can be said to be mechanical experts, and there are really some class axes, but the explanation is finally completed, and the rest needs to be analyzed by these two experts themselves.

In the past, Zhang Da and Zhang Da have always been divided into labor in this way, Zhang Da can not only implement Lu Bu's ideas perfectly, but also be able to propose many valuable improvements, which is why Lu Bu is very relieved of him.

Glancing at the master and apprentice who were devoting themselves to the research of new products again, Lu Bu quietly walked out of the room.