doomsday survival

Chapter 360
Yang Cheng caressed the woodworking lathe with his hand, his eyes revealed a strange brilliance, as if he didn't hear Shi Jian's question at all.

Shi Jian didn't urge him either, and looked at Yang Cheng with a smile, waiting for his reply.

"Before lunch, it will definitely be done." Yang Cheng raised his head and said with certainty.

"Okay, I'll leave it to you." Shi Jian turned and left after speaking.

When he returned to the fire brigade, he happened to meet Xia Qing holding Shi Qiong out to bask in the sun. Shi Jian immediately walked two steps quickly, stretched out his hands, and wanted to take his son over.

When Shi Qiong saw her father coming, she smiled like a blooming flower, waved her two little hands, and leaned forward.

"Be careful." Xia Qing ordered, and handed his son into Shi Jian's hands.

Shi Jian held Shi Qiong's armpits with both hands and held them up high, making Shi Qiong laugh non-stop.

Xia Qing put his hands beside his son to prevent accidents, and said angrily, "Don't do this, you will scare the child."

"It's okay," Shi Jian replied with a smile, "It's better for the boy to be bold."

Having said that, Shi Jian still put Shi Qiong down and hugged her in his arms.

Shi Qiong became a little unhappy, and opened her small mouth as if to cry.

Seeing this situation, Shi Jian hastily gestured with his hands in front of his eyes, and made a face at the same time, successfully diverting his son's attention and making him laugh again.

"What else are you busy with today?" Xia Qing asked softly.

At this time, Shi Qiong grabbed Shi Jian's finger and desperately tried to pull it to his mouth, as if he wanted to taste what it was like.

"It's still a crossbow." Shi Jian let his son pull his finger over and replied.

Half-year-old Shi Qiong has already grown small front teeth, and he uses these small teeth to gently bite his father's finger.Maybe because he felt that there was no taste, he let go of his hands again and struggled in Shi Jian's arms.

"Then go get busy," Xia Qing said while reaching out to his son, "Come on, mom hug."

Shi Jian handed his son back to his wife, then looked at her affectionately, and said, "Thank you for your hard work. After finishing these things, I will take care of the child for two days and give you a holiday."

"Just two days?" Xia Qing pursed her lips and said pretending to be dissatisfied.

Shi Jian looked at his wife's ruddy lips, and felt a little impulse in his heart. He looked left and right to see if there was no one, and then kissed her suddenly.

"I hate it, the child is watching." Xia Qing said angrily.

"Hehe, what does he know, a brat?" Shi Jian said with a smile.

Xia Qing stretched out his fist and tapped him on the shoulder, and said, "Who doesn't understand, we understand everything, don't we?" The second half of the sentence was to ask Shi Qiong in his arms.

Shi Qiong hummed just right, making Xia Qing look at Shi Jian very proudly.

"Little poor boy." Shi Jian flicked his son's head lightly, in return Xia Qing slapped him hard on the hand.

"Terrible," Xia Qing snarled, then pushed Shi Jian with her hands, and said, "Hurry up and go, I don't dare to let you take care of the child, who knows when we will be beaten up."

"Am I that kind of father?" Shi Jian muttered, stretched out his hand and scratched his son's chin again, making him laugh again, before turning and leaving.

Back in the office, Shi Jian took the parts of the push crossbow and began to assemble it, wanting to see if he could find the problem.

However, after a long time of installation, it was still the same as before, with only a general appearance, but it was absolutely impossible to launch.

Ordinarily, with Yang Cheng, Shi Jian could have entrusted Yang Cheng to do this, but considering that Yang Cheng is a prisoner after all, it is most suitable for him to hold this kind of thing in his own hands.

When Shi Jian was thinking about what parts should be added, there was a soft knock on the door.

"Come in."

The door opened in response, and it was Yang Cheng and Zhang Weiqiang who came in, and Yang Cheng was still holding a crossbow in his hand.

"It's done so soon?" Shi Jian asked in surprise.

Yang Cheng smiled shyly, and replied: "Boss Shi, it's actually not fast, mainly because the lathe is so good."

"Well," Shi Jian responded, stretched out his hand, and said, "Come on, let me see."

Yang Cheng handed the crossbow to Shi Jian, but his eyes were attracted by the hand crossbow on Shi Jian's table. He wanted to ask but found that Shi Jian was checking his own crossbow, so he suppressed his curiosity. .

Shi Jian put the crossbow in his hand and checked it repeatedly.

This crossbow looks very similar to ancient crossbows. It is sixty to seventy centimeters long. The body of the crossbow is made of wood, and the strings are made of animal tendons.

He took the arrow from Zhang Weiqiang's hand again, put it into the card slot, and put the arrow into it with great effort.

Shi Jian did not try to shoot, but took down the crossbow again, shook his head and said, "Let's not talk about the power, but the difficulty of loading the arrow is a bit too big."

Yang Cheng's face turned red, and he explained: "It's more convenient to step on it with your feet."

Shi Jian didn't comment, but pointed to the hand crossbow on the table and asked, "Yang Cheng, what do you think of this?"

Yang Cheng wanted to ask a long time ago, when he heard Shi Jian's words, he immediately said: "Boss Shi, this is also a crossbow, but I have never seen one like this before, so I don't know what these are for." He pointed at the crossbow Body pulleys.

"Assist, with this, you can install the crossbow very easily." Shi Jian explained.

Yang Cheng stretched out his thumb and praised: "This idea is really clever."

Shi Jian continued: "I originally planned to make a wooden sample first, and then use steel to make the final product. Unfortunately, I don't know much about this. There are a few parts missing. Can you see if you can finish it?"

Yang Cheng asked tentatively, "Can I have a look?"

Shi Jian laughed and said, "Of course you can, otherwise how could you complete it?"

Yang Cheng stretched out his hand to get the hand crossbow, only to find that the various parts were not connected at all, they were just assembled together, and fell apart as soon as he picked it up, so he had to look carefully on the table.

Shi Jian handed him the original design drawing again, told him the function of each part, and then talked about what the final product should look like.

Yang Cheng listened carefully, while looking at the design drawing, while assembling the hand crossbow, he quickly put down the end of the crossbow and said: "Mr. Shi, there must be something missing here in the trigger?"

"Yeah, I know something is wrong here, but I didn't figure out how to do it." Shi Jian admitted.

"These are all similar, how about mine?" Yang Cheng asked.

"Row."

Yang Cheng observed it carefully again, then picked up a pen to draw on the paper, and said, "Mr. Shi, then I'll go and process it now."

Shi Jian nodded in agreement, and when Yang Cheng and Zhang Weiqiang went out, he sighed and said, "They are all engaged in mechanical design, why didn't I think of it?"

In fact, Shi Jian has made a fool of himself. He always thinks that the trigger should be the same as a gun, which can automatically reset, and needs to add a spring or something.

As a result, I didn't expect that it was purely a mechanical structure, and it was not difficult to design.

In other words, he has a specialization in technology. Yang Cheng likes to study various exquisite mechanisms, especially the crossbow. He can solve problems more easily than Shi Jian, a talented student in mechanical design.

Yang Cheng returned again, quickly installed the trigger on the spot, connected all parts together with a wooden wedge, and handed it over to Shi Jian.

Shi Jian tested the trigger a few times back and forth, and found that it was very flexible, so he picked up a prepared bowstring and connected it.

Because this crossbow is powered by a pulley, it can be pulled apart without much effort, which is indeed much more convenient than the one made by Yang Cheng.

Shi Jian felt it carefully, and said to Yang Cheng: "Yang Cheng, you should understand the usefulness of the pulley, now if I let you continue to improve, can you do better?"

Yang Cheng thought for a while and said, "Mr. Shi, I can try."

"Okay, I'll leave it to you, and I'll tell you the things you need to pay attention to." Shi Jian said.

Next, Shi Jian explained the characteristics of modern crossbows to Yang Cheng.

The crossbow made by Yang Cheng is no different from the ancient crossbow.Due to the different materials used in modern crossbows, the design of the crossbow body has changed. At the same time, referring to the characteristics of modern guns, the trajectory has been improved, and it is stronger than ancient crossbows.

Although Yang Cheng hadn't learned these things before, he excelled in special research and quickly absorbed the knowledge Shi Jian taught. After a week of repeated experiments, he finally decided on a design plan.

While Yang Cheng was researching the crossbow, Shi Jian and Gao Shanhe finally refined the spring steel, and the performance satisfied Shi Jian.

When making steel, it really followed what Feng Kuang said, adding animal bones to it, and it succeeded.

This made Feng Kuang very proud, and he boasted to Shi Jian for several days, describing himself as brighter than Zhuge and Kongming.

After Yang Cheng's plan was finalized, Zhang Weiqiang started to make sand molds and successfully cast the body of the crossbow, leaving only the bowstring unsolved.

In fact, steel wire is not a good choice, because the steel wire is heavy and does great damage to the crossbow piece, but now there is no composite material, so it can only be used.Anyway, at Shi Jian's time, except for a few brands of domestic crossbows, they all used steel wire strings.

Shi Jian picked up the No. [-] test object, and couldn't help frowning, because it was made entirely of steel, so it was relatively heavy, not light at all.

After shooting two arrows, Shi Jian was still a little dissatisfied, because he felt that the power of the crossbow was not as great as he imagined.

"What's the problem?" Shi Jian thought carefully.

Feng Kuang also carefully recalled Chen Qiong's crossbow at that time, and finally said: "Shi Jian, I remember that the pulleys don't seem to be so round."

Shi Jian thought about it carefully, and immediately understood, he slapped his thigh and said, "I know, it must be the eccentric wheel!"

The function of the eccentric wheel is to save labor and speed up. Through the irregular parabolic orbit of the eccentric wheel, the movement speed of the string is accelerated, so that a higher arrow can be obtained under the same working stroke than the traditional recurve crossbow. speed and greater power.Therefore, compared with the composite crossbow with the same power, the composite crossbow can be made smaller.

After another three days of research and improvement, a crossbow that fit Shi Jian's wishes was finally placed in front of him.

　Ask for three monthly tickets!Not much!

　　
　
(End of this chapter)