After three days, it will be used as a workshop supervisor.

"Your Highness, please look!" Lifting a box that two guards carried into the official office, Liu Min said with some excitement.

"Shhh Looking at a box full of three-edged arrows, Li Chengqian gasped and asked in a deep voice, "Is the mold made?" ”

"Don't hide it from Your Highness, the mold was made on the same day, but it took another day to fire, so these are the results of yesterday's day!" Liu Min's face smiled like a flower, if it weren't for the ears in the way, it is estimated that the old man's mouth would be able to grin to the back of his head.

"Okay, good, one day, good, really good, how about the production speed compared to the previous standard arrows?" Li Chengqian was also very excited, as long as the speed of processing this is not slow, soon the three-edged arrowhead should be able to popularize the whole army, and it will be able to come in handy for next year's expedition to the Turks.

"It's much faster than before, and it saves a lot of labor, and if you don't consider the polishing process, it's a world of difference." Liu Min looked a little crazy.

The use of molds is not only used for arrowheads, if you zoom in on a little bit, the tip of the gun can be made in this way, and the knife can also be used, which is simply an infinite increase in production.

Of course, knives and guns need to be reshaped and remade, but unless it is a 100-strong steel knife, it is still two or three times faster than before.

"The polishing thing will find a way, and it won't disappoint you in the future." Li Chengqian said with a light smile.

"Your Highness, the old minister ...... last time Last ......, there were many rudenesses, and I hope that His Royal Highness Haihan. Liu Min was excited for a long time, and after a long day of work, he finally remembered that the method of the mold was proposed by His Royal Highness the Crown Prince who was not very old in front of him.

"Okay, okay, don't pretend to be fake, you have a lot of credit in this, this palace will definitely show your father and remember your first merit." Regarding Liu Min's condescending attitude, Li Chengqian smiled indifferently.

A person who has the ability is not a little arrogant, as long as he can complete the task assigned to him, he is a good comrade!

"Your Highness's merits, the minister doesn't dare to take the lead, and he still wants to ......," Liu Min said with an embarrassed expression.

"You don't need to say anything about this, this palace has its own plan." Now that the mold matter has been settled, Li Chengqian didn't want to bother more about it, and after interrupting Liu Min, he continued: "How is the eccentric wheel, how much is it out?" ”

"There are only a dozen eccentric wheels, so let them get them." Liu Min confessed, ran to find someone to get something, and when he came back, he put it on the table and said, "Your Highness, see if it's like this." ”

"Do you have to try it to find out?" Li Chengqian picked up a pair of eccentric wheels and put them in his hands, and said to Liu Min while looking at them.

"I wonder what His Highness wants this for?" Liu Min didn't dare to hold it up again this time, and asked cautiously.

After a lesson, Ya now doesn't dare to underestimate Li Chengqian, and he still expects Li Chengqian to guide the new steelmaking process.

Although the application of molds has increased the speed of the production of weapons, it has also accelerated the consumption of steel, and if we do not find a way to increase the production of steel, I am afraid that a large number of craftsmen will lose their jobs.

"Let's go, let's go to the crossbow shop together, this thing is used on bows." Signaling Wang Chenghu to put away the eccentric wheel on the table, Li Chengqian got up and walked outside.

"Bow? Eccentric? Liu Min scratched his head, although he had made two eccentric wheels by himself, but he didn't know the use of this thing, just like a worker in the workshop made airplane parts, but he didn't know where this thing was installed on the plane.

The crossbow workshop, which is subordinate to the general supervisor, is mainly responsible for the production of bows, crossbows, and arrows.

After finding a bow maker, Li Chengqian carefully said the installation location of the eccentric wheel, and asked the bow maker to install and debug.

Originally, Li Chengqian also planned to tell the archer about the principle of the eccentric wheel, but after Bao said a few words, he found that the archer's eyes were full of circles, and everything he said was in vain.

"Your Highness, why did you put this wheel on the bow?" Wu Chen took advantage of the time when the bowsmith was looking for the bowstring and asked Li Chengqian.

Li Chengqian didn't think that Wu Chen could understand what a moment was and what a lever was, so he simply said: "You just remember to let the arrow fly farther, the principle ...... I won't tell you, you won't understand it anyway. ”

"Tell me, how do you know I don't understand if you don't say it?" Wu Chen pursed his mouth and said grindingly.

Looking at Wu Chen, who was not convinced with a flash in his eyes, Li Chengqian sighed and said, "Okay, then let's talk about it." Let's start with the first point, pulleys. The application of the so-called pulley can be divided into movable pulley and fixed pulley, and the one we use on the bow is movable because the bow arm is movable, so the pulley hanging on the two corners is a movable pulley relative to the other corner......"

"Your Highness, I, I have a stomachache, go to the toilet, and let Brother Hua'an accompany you for a while." Before Li Chengqian's words were finished, Wu Chen hugged his stomach and coaxed him, and the passive pulley and fixed pulley were directly stunned, and he had the intention of escaping.

"You're going to stay here, the archer's back." Li Chengqian shook his head and smiled, stopping the conversation, saving Wu Chen from the embarrassment.

Compared with the current bow, Datang's bow is much simpler, so except for some effort when fixing the eccentric wheel, there is basically no difficulty in installation. So after finding a basic bowstring, the archer simply hung a bow with an eccentric wheel on the long string.

"Come on, who wants to try." Looking at the longbow made by the bow maker, Li Chengqian asked Wu Chen and Cheng Huaan.

"I'll come." Wu Chen, who was extremely curious, volunteered to stand up.

"Be careful, don't shoot anyone." Li Chengqian motioned to the archer to hand Wu Chen the longbow with the eccentric wheel on it, and instructed carefully.

"Don't worry, Your Highness, although I don't have the skills of benevolence, I don't shoot my right eye with my left eye within a hundred steps." Wu Chen took the longbow and tried to open the bow twice, feeling that it was really much lighter, and couldn't help but take a closer look at the eccentric wheels installed at both ends.

"Don't, go to the range, don't be here." Li Chengqian found that Wu Chen grabbed an arrow from the side at random, put it on the bow and was about to test fire, so he hurriedly stopped it.

The modified bow is completely different from before, because the eccentric wheels at the two ends have changed the moment of the bow, so the speed of the arrow is not the same as before, Li Chengqian is very worried that Wu Chen will get into trouble.

And things were really the same as Li Chengqian was worried about, Wu Chen really missed the test shot at the shooting range, and the arrows that were originally aimed at the target flew directly from above.

Those present were either martial artists or bow makers, but Li Chengqian, who was nothing, had a deep theoretical foundation, so the reason for Wu Chen's failure was quickly found.

After the bow was modified, the elastic power became greater and the speed was greater, which made the parabola longer after the arrow was fired.

According to the distance of the arrow, the archer made a general estimate, and came to the conclusion that the power of this modified three-stone bow was no less than that of a four-stone strong bow. (This is a conjecture, in the case of the specific size of the bow, I don't know the size of the moment and the arm, and I can't calculate how much force will be generated.)