At this time, Wang Yi retreated for several days, and when he came out, the dark circles under his eyes were thicker than those of a panda, and his expression was a little depressed.

"What's wrong? Didn't work it out? ”

Ke

looked at him with a smile, he was originally fighting in the plane to carry out tasks, but now it has become like engaging in scientific research.

"No, the bed crossbow is not very easy to make, it is too delicate."

Wang Yi shook his head, he originally planned to draw a drawing for Persian craftsmen to make first, but he didn't expect a drawing to stump him, the bed crossbow is different from the catapult, it involves a variety of precision parts, Wang Yi has never touched this kind of thing, it is very difficult to imagine out of thin air.

"If you don't mind, you can let our craftsmen study with you, there is a lot of power."

Xerxes's title has been changed to you, so it can be seen that his respect for Wang Yi is not a little stronger than Leonidas.

"Let's try again."

Wang Yi walked out of the door, he felt that the sun was very dazzling after not seeing the sun for a few days, what he wanted to do was an ancient weapon he had seen before, our motherland was really talented in ancient times, and the weapon was ahead of the world for I don't know how many years, and even ** was the first to be discovered and used by the motherland.

"What I want to do is something called a three-bow bed crossbow, and the specific shape and principle are like this......"

Wang Yi recruited Persian craftsmen and carefully explained to them the characteristics, lethality and principle of a three-bow bed crossbow, and found that these Persian craftsmen were confused, and they couldn't imagine what the weapon described by Wang Yi looked like before seeing these things.

"Forget it...... You don't even have normal crossbow arrows, so I'd better tell you about normal crossbow arrows first. ”

Wang Yi sighed, it was true that he was too eager for quick success, and he hadn't even tried to make crossbow arrows himself, let alone bed crossbows.

Wang Yi then explained to them the situation of ordinary **, compared with the complex bed crossbow, the manufacture of ** will be a little simpler than the bed crossbow, and these Persian craftsmen have experience in manufacturing catapults, as long as they change their thinking, they can know the general principle, plus this thing is similar to bows and arrows, Wang Yi doesn't even need drawings, these Persian craftsmen volunteered to make the first generation of **.

“……”

After Wang Yi saw it, his face was black, and he was very speechless, what they did was just something similar to a bow and arrow, that is, it looked like a crossbow, but it still needed to open the bowstring with both hands to fire, and because of this strange shape, the power was smaller than that of a bow and arrow.

scolded them, and Wang Yi explained to them again the two most important features, which are convenient and powerful.

**It is necessary to use a trigger-like actuator of a pistol to fire, and then the problem of power is the same as a compound bow, using the principle of elastic potential energy of the material by combining the power of the human being with the elastic force of the object to launch a powerful arrow.

As soon as Wang Yi finished speaking, he was immediately stunned, these people didn't even have a compound bow, and they didn't know the principle of a compound bow......

Then Wang Yi began to popularize compound bows for them again, and talked about a bunch of things, Wang Yi talked dryly, but he still couldn't stop, whether they understood it or not, he still had to take them to make a prototype when they had an impression, and he didn't forget after a while that he had to bother talking again.

This time he learned wisely, and planned to use a step-by-step method, first make a compound bow, and then take a compound bow to discuss the relationship between the crossbow and the compound bow with them, as for the trigger of the crossbow arrow, it will be easy to do, a hook that stretches the bowstring, and after hanging it, make a small device attached to the pulled trigger, put the arrow in the arrow slot, and you can fire.

This is a single-shot **, after shooting, you need to reload the arrows, even slower than the bow and arrow, but the power is definitely greater than the bow and arrow, and it is more convenient, it is used to carry the back of the surprise soldier to hit the enemy by surprise.

As for the repeater......

Wang Yi really didn't want to think about it, he could only sigh at the wisdom of the ancient people of the motherland, it was really NB.

After making a compound bow, Wang Yi sent someone to try out the power, and he felt that it was less labor-saving than a bow and arrow, and the power was similar to that of a bow and arrow.

"Come and see! The next thing is to do it! The principle is similar to that of a compound bow......"

Wang Yi clapped his hands, took the compound bow in his hand and began to explain again, now these Persian craftsmen look at Wang Yi's expression as if they are looking at a fairy, there is no other emotion in their eyes, only worship, no matter what they say.

For several days, the craftsmen slept almost an hour or two a day, ate only one meal, and spent the rest of their time researching and making.

There were countless mistakes in the manufacturing process, such as the crossbow string material was not suitable, it was often broken, the trigger was not responding, or the accuracy was not guaranteed, which were all problems that Wang Yi and the craftsmen needed to solve.

These days, Rya Ke

They and the Persian army were not idle, they went out every day to shake in front of the hot springs, to increase their morale, and the light curtain has not disappeared since it was raised, and I don't know what the hell the oracle is doing.

**It took so many days to get what he wanted, but fortunately, Wang Yi was very satisfied with all aspects of power, but this is not over, Wang Yi's purpose is to make the final ultimate killer, the three-bow bed crossbow!

With Wang Yi's superhuman physical strength, he felt tired after working for so long, not to mention these craftsmen, Wang Yi gave them two days off to rest, Wang Yi was afraid that they would suddenly die......

I have to find a new group of craftsmen to re-explain all kinds of things, so I don't have to be tired to death......

Hearing that the craftsmen were still unhappy on vacation, they had an attitude of not giving up on sudden death, and they were really interested in studying them, and in the end Wang Yi forcibly asked the soldiers to take them home to rest.

Wang Yi continued to draw drawings in the house alone, ** made it, the three-bow bed crossbow was not far away, the drawings were drawn very easily, and then it was the most difficult problem.

Materials, the bowstring used and the bed crossbow are definitely not the same, the bed crossbow is huge, the bowstring made of ordinary materials can't withstand it, it is easy to break, Wang Yi went out to look for a long time and didn't find the material that can be used.

In the end, I gathered craftsmen and came up with a method to use the tendons of various animals, plus tender bamboo and fish gelatin, and mixed to make a string, which has a strong bearing capacity and is more elastic and better! However, because it is too thick, it can only be used by bed crossbows.

The process of making a three-bow bed crossbow was slow, every part had to be carefully polished, and in three days, the first three-bow bed crossbow was finally built.

Wang Yi couldn't wait to experiment with the power of this crossbow, so he pulled it directly to the cliff and aimed at the light curtain, of course, this will definitely not see the power, but when the range is reached, the power will naturally be there, and by the way, try the accuracy.

Xerxes was also on the side, and he looked curiously at this huge thing, what was so peculiar that it needed to be studied for so long.

The three-bow bed crossbow is not pulled by one or two people, but requires a full thirty young and strong strongmen to pull it together.

"Launch!"

Wang Yi's mood now is as excited as if he is directing the launch.

"Whoosh!"

There was really a sound of breaking the air as the bed crossbow was launched, and the speed was very fast, and it reached the light curtain in an instant.

"It's in!"

Bo Zai shouted with a sniper scope, but he didn't expect this bed crossbow to pass directly through the light curtain and shoot into the hot spring pass!