"My lord, where is the master craftsman? I want to meet him, I have some academic questions and want to ask him for advice!" Old Sopa looked excited, he had never known that machines could evolve to such an extent, and if he could, old Sopa would even like to follow that master as an apprentice.

There is no shame in this, every craftsman must know that scholarship is never-ending, and if you slack off, you will be eliminated.

Every master always has the heart of an apprentice.

Old Sopa looked at Rand with expectation in his eyes, hoping to get the answer he wanted from him.

"Well, I'm afraid there's no need to ......," Rand grinned, he was pleased with old Sopa's reaction, as long as it piqued his interest, then whatever was going to be talked about was very easy.

"Why? Is it the master who wants to hide his identity?" asked Old Sopa eagerly, he also understood the other party's approach, after all, once such an advanced machine leaked out, then there would be an endless stream of famous craftsmen, "I assure you, I can absolutely keep my mouth shut, and I will not mention this to anyone, I swear to the gods!"

"I think you misunderstood me," Rand cleared his throat, thinking that he should tell Old Sopa the truth at this point, after all, hanging his appetite for too long might backfire, "I want to say that the craftsman who made the fuel engine is standing in front of you at this time." ”

Old Sopa looked around in great confusion at first.

Is it one of those craftsmen who are at work?

No, it's impossible! How could a master who was able to make such a precision machine be willing to do such a mass-produced work with no technical content!

Was that the boy who was following Rand, or was it the woman with a nice figure?

No matter how you look at it, it doesn't seem like they have such a forward-thinking design concept.

Could it be......

Old Sopa thought of a possibility that he couldn't believe, and he slowly raised his head, his gaze fixed on Rand's face.

It's him?

Hiss......

Old Sopa gasped, his voice trembling.

"My lord, don't you tell me that you are the one who designed this machine?"

"Is there anything surprising about this?" Rand shrugged his shoulders and looked bleak, "It's a very basic mechanical structure, if you want to learn, I can teach you." ”

Old Sopa's eyes widened, and it wasn't until he heard Rand's last words that he gasped heavily: "My lord, if it's not my ears, then I'm dreaming, how can you know how to make machinery?"

"Do you need to talk about these in detail?"

Old Sopa's eyes almost lit up, and he blurted out directly: "Of course!"

......

"This is, heavy crossbow!" "Old Sopa stood on the head of the wooden house, and stroked the arrows of the ballista with his hand, as if touching an extremely precious treasure, "No, it's not an ordinary siege crossbow, it has two arrows and ten bowstrings...... It's a haircut, oh my God!"

Rand couldn't help but feel a little proud as he looked at the fanatical expression on Old Sopa's face, the ballista was the first machine he had made, and it was one of the main forces to defend the town.

Heavy crossbows are not uncommon, but city-defying crossbows with even hairstyles are extremely rare, and old Sopa gently pulls the bowstring, and a huge force pulls it, and the bowstring does not move at all.

"It's so powerful!" old Sopa wiped the sweat from his forehead, he had just exhausted all his strength and couldn't pull the bowstring, "how powerful is this thing?"

"You can try it, but the results may not be what you expect. Rand patted the shaft on the ballista and demonstrated, "I was also taken aback by the penetrating force of this thing. ”

Old Sopa was obviously also very interested in the ballista, although this kind of simple siege machine was not as sophisticated as the fuel engine, but the ballista, a weapon whose original mission was only to kill, obviously attracted the attention of Old Sopa more, as a master craftsman specializing in the production of weapons and armor, he was obviously fascinated by the ballista.

"Go get some arrows. Rand instructed his entourage to go to the storehouse to collect what they were going to use, arrows, and steel plates to protect their targets.

The accompanying soldiers were extremely efficient, and soon a target was erected outside the city gate with wooden stakes and steel plates.

A distance of one hundred meters is enough for the ballista to exert maximum penetration.

"It's time to go!"

Old Sopa turned the hinge with his right hand as Rand had taught, watching the bowstring pull apart little by little, and then snap into the groove with a click.

"This is a simple ballista, using card slots and pulley technology," Randt said, in fact, the ballista itself is not too technical, the most sophisticated part is the sight at the top of the ballista's arrow path, called the ruler of Wangshan.

The slightest difference in the gap between the rulers can affect the final landing point of the arrow, and Rand has done hundreds of experiments to make it as accurate as possible.

"See the tick mark with the sight of one eye," Rand explained to Old Sopa in great detail, pointing to a bulge at the back of the arrow, "and this point is most accurate when it passes through the ring at the mouth of the arrow and is in a straight line with the target." ”

As for the things that affect the accuracy of shooting by wind or light, Rand didn't say much, those are things that only soldiers need to know.

Old Sopa only needed to know how and how powerful this thing was.

"There is a small reel, which can be used to adjust the height of the arrow path and change the arrow path from single shot to multiple shots. Rand pulled the card slot under the arrow path, "Your first shot, let's try the less difficult single arrow first!"

"Don't underestimate me, I also served in the army for a long time before joining the Rose Workshop......" Old Sopa muttered dissatisfiedly, turning the axis below with his right hand, "The height adjustment mechanism is really well designed, it is made of some kind of slotted bolt, right?"

Rand shrugged his shoulders, "That's right. ”

Looking at Rand's indifferent appearance, old Sopa was a little frightened, the technology of making bolts was not mature enough even in the Rose Workshop, and he had also tried to use the blade expansion method to make bolts, but the strength of the finished bolt buckle was not up to standard, and it would crack or misalign if it could not withstand too much force.

The bolts used on this ballista are obviously stronger than those made by themselves with the blade expansion method, and the palm of the hand shakes the hinge without feeling the heaviness or detachment, and the accuracy is also extremely high, and the arrow path is slowly descending, and there is no such sudden fall.

This is a rare thing, and old Sopa secretly decided in his heart that he must find an opportunity to ask Rand what technology this bolt is made of.

"This position, it should be about the same. ”