Da Vinci tilted his head and looked at the dimly lit hut in a daze, and only after a while did he sniff and his dull eyes fell on Zheng Fei.

"It's you," he choked.

Zheng Fei took the oil lamp handed by Hans, walked up to him, squatted down, and looked at him carefully by the light, his face was dirty, his hair had not been washed for a long time, and he smelled strange, and the whole person was like a little beggar squatting on the corner of Lisbon.

"Why did you come here?" Zheng Fei said with concern, and at the same time, the knot in his heart also relaxed, and the frowning brows that had been tight before were loosened a lot.

Da Vinci found it, and it was a great fortune, irreplaceable.

Hearing what he asked, da Vinci scratched his face twice, thought for a while, pursed his mouth blankly, and said with a smile: "Forgot"

As soon as the words fell, he suddenly remembered something again, and immediately cheered up as if he had changed his spirits, and said, "You come with me to see this!"

With that, he ran back to the table, pointing to a large thick stack of parchment, his eyes full of urgent anticipation.

Looking at his expression, Zheng Fei felt that something must be good, and beckoned George to go over with him.

Leonardo da Vinci had come after the convoy had left Lisbon to join the South America, and there were so many other people on board that he couldn't calm down and think about it, knowing that he still had a lot of things to study.

Because Zheng Fei explicitly forbade idlers to board the South America, he took advantage of the fact that the sailors were not paying attention at night, sneaked into the sea with a swimming ring, and got into the deepest part of the cabin.

The reason why he stayed here was because he became interested in what George did, boys, born with a love for guns, not to mention the opportunity to make guns, not to be missed.

Unwilling to be taken out in the middle of his research, he begged George not to sue anyone else and went into the secret room, took a pile of bread and water, and stayed inside.

George stayed in this cabin every year, and only occasionally went out at night to breathe, not knowing where he came from, not knowing that he was looking for him outside, and he was usually so busy that he gradually forgot about it.

In George's feelings, this kid who only eats bread and water all day long, and keeps spending strange patterns, is a madman.

True geniuses, all are crazy.

They can concentrate all their attention on what they are interested in, and they don't care about what is going on outside the window, and they don't care about their environment or what others think of them.

In their eyes, they can only see concentration, concentration, and concentration.

Walking into the secret room, the light cast by the four oil lamps reflected the small secret room a little dazzlingly, and on the floor and on the table, there were countless pieces of parchment, some with symbols, some with guns.

Zheng Fei found that da Vinci seemed to be particularly keen on drawing a cone-headed cylindrical symbol, like the allusion to the egg, and repeatedly drew at least a few hundred pieces of paper.

"What do you want me to see?" Zheng Fei asked with interest, looking down at the strange symbol.

Leonardo da Vinci is the best at creating surprises.

Leonardo da Vinci spread out the piece of paper and said, "Many days ago, he said that he was modifying the chamber of the gun and that the problem of bullets could not be solved. He pointed at George, and then added, "So I wanted to design a bullet that would fly out of the muzzle of the gun without compromising the airtightness, and make the most of the power of gunpowder." ”

As he spoke, he pointed to another piece of parchment with the structure of a rifled gun drawn on it, and said, "Rifling can speed up the flight speed of the bullet and increase the range, but the disadvantage is that the space in the barrel will be larger, and the bullet can only be increased by increasing the volume of the bullet to improve the airtightness, but then it will increase the weight of the bullet, and then I tried to make the bullet hollow." ”

Da Vinci rummaged through the parchment of the room, anxious as if a soldier had lost his gun, hurried but methodical, and after a good two minutes of rummaging, he finally exhaled easily and took the drawings.

Seeing that he had a serious demeanor, coupled with what he said before, George couldn't help but blink a few times, and whispered to Zheng Fei: "Captain, how do I feel that he doesn't look like a madman?"

"No, he's a madman. Zheng Fei smiled.

"No, he could have come up with the idea of hollowing out bullets, I didn't think of it. ”

"It's because he's crazy that he thinks of it. ”

As he spoke, da Vinci spread the drawings on the table, smoothed them out, thought for a while, and then continued: "The problem is that hollowed-out bullets are easy to flatten or shatter, and the penetration will be greatly reduced, so I designed a bullet with this structure, don't look at it as inconspicuous, squeeze it from the direction of the warhead, or even hit it with a stone, it will not deform." ”

At this point, da Vinci squeezed his eyes triumphantly, and his face soared.

Zheng Fei glanced at the drawings, the shape of the warhead is a supporting structure that was widely used in the construction industry hundreds of years later, and this kid didn't know how to make a few circles of threads at the top, although the processing difficulty is a little higher, but it can effectively improve the flight speed and range of the bullet.

"Well done. He couldn't help but praise that he was worthy of being an epoch-making technology giant, and he could think of these things with a thinking of only a teenager.

He just wanted to hand the drawings to Hans and instruct the craftsmen to produce them in batches, but Da Vinci took them back, crumpled them with his palms, shrugged his shoulders, and said: "However, it is not perfect, because the size of the bullet is too large to block the muzzle of the gun, and it increases a lot of unnecessary resistance." ”

Hans's face sank and he said, "Damn, why did you show us so much before?"

"Well, I just want you to see the fruits of my labor these days, and it looks fuller, hehe" da Vinci pursed his lips as if aggrieved, and then took out a neatly folded piece of paper from his arms, carefully unfolded it, and stuck out his tongue with more smugness in his eyes, which shows that even if he has deep thoughts, he has not lost the innocence peculiar to youth.

There is a cone-shaped thing drawn on the drawing, which reminds Zheng Fei of the basket used by fishermen in his hometown to catch yellow eels when he was a child, but he could not get in or out.

"Shrink the size of the bullet and add a device to its tail, which will expand the inner layer of the barrel after filling out the form, prevent the air from escaping, do not waste the propulsion of the gunpowder, and when the bullet is fired, the drag will be greatly reduced. ”

[It's a little late today, there is a more ~ more than 30 degrees of high temperature after 12 o'clock, the hot sun is shining, and I am tossed half dead outdoors, which is simply sour. 】