The mysterious general camp of the Gushan Army came out, and Zhao Zheng asked at the new site of the camp: "Is the development of the cannon still going well?" ”

Zhao Feng lowered his head and took out the record book from his arms, and read it in a low voice: "The thousand-kilogram heavy artillery consumes 5,700 catties of steel, and it is made into two cannons, with a firing range of about ten miles." Pen "Fun" Pavilion www.biquge.info

A solid bullet shattered ten miles away; One hollow bullet, almost no pigs and sheep remained.

However, each launch took about a third of an hour, and it could not meet the rapid-fire standard mentioned by the lord. ”

Looking at Zhao Feng's pleading, Zhao Zheng pulled him up with a smile, he was also anxious, the breech gun era had not yet entered, and he already wanted to achieve the effect of rapid fire and cluster killing in the breech gun era, which was tantamount to a fool's dream.

Gong Yi Duo was already sluggish, and he was familiar with mechanics, but when it came to gunpowder knowledge, he became a child, and he was interested in it, and he would not give up until he understood it.

"The Gushan Army has such a killing weapon, I don't know if I can take a look at it?"

For the sake of the knowledgeable person's sharp weapon in his heart, the public loser, who has always regarded himself as a guest secretary, actually made the ministers bow to Zhao Zheng.

Zhao Feng's immature face showed a subtle killing intent, if Zhao Zheng was not there at this moment, then Gong Yi Duo would know life and death. Perhaps in the hearts of others, the departure of Chun Niang and the carpenter is just sadness, but the separation of relatives in his childhood is a great pain.

"The light cannons below 1,000 catties have also been successfully cast into two according to the design of the main man, but after firing more than 30 pieces, the cannon bodies have cracked to varying degrees."

Gong Duo looked at Zhao Zheng anxiously, and he was helpless to ignore Zhao Feng, but once Zhao Zheng nodded, the artillery didn't just want to see it.

"It's cracked", Zhao Zhengmo rubbed his chin and pondered, heavy cannons are difficult to crack because of the thick cannon body, but the inconvenience of carrying makes their deterrent significance greater than that of war. Zhao Zheng's idea was to invent a cannon that was both portable and powerful, so that in his future siege of the city, the casualties of the soldiers would be greatly reduced.

"What size of steel do you use?"

"Tianzi No. 1"

After a year of carpenter's research, the quality of Gushanjun's steel continued to rise, and the hardness was even comparable to that of modern steel. Therefore, a batch of flint guns are being secretly developed, and the secrecy level is the highest level, and only Zhao Zheng can intervene.

The higher the number of the steel, the harder it is, which is also one of the easiest grading methods.

The moment the gunpowder explodes in the shell, the chamber temperature will rise rapidly, and the next shot must be poured into cold water to cool down, and the cannon body is easy to crack under thermal expansion and cold contraction.

Thinking hard to no avail, only by seeing the real thing, the encyclopedic knowledge deposited in the brain in the previous life will emerge, and Zhao Zheng took Gong Duo to the artillery test site.

As soon as I entered, an iron cannon weighing more than 2,000 pounds was lying on the gun mount, and the surroundings were empty, and there was not even a technician.

This kind of thing has always been done by Zhao Feng himself, choosing many honest assistants, and now Zhao is about to upgrade, and the assistants have also been removed by Zhao Feng.

"Fire a shot, I'll see the effect."

Zhao Feng nodded, took out a key with a strange style from his body, and pulled a small car back after a while.

Cleaning the chamber, pressing in the gunpowder, and finally putting in the shells, plus the lead, these are all necessary steps, and Zhao Feng lightly ignited the powder twist when he was familiar with it.

"Boom~"

The huge roar shook the dust, and Zhao Zheng covered his ears and observed the subtle changes in the cannon body. The temperature of the chamber under the explosion has been terrifying several hundred degrees, and if you touch it with your hands at this time, it will inevitably burn off a layer of skin.

"Squeak~~"

A layer of white smoke rose from the barrel of the gun, and as the white smoke dissipated, an imperceptible crack gradually appeared. This time it was cooled from the outside, so the crack showed itself outside the cannon.

Artillery is the privilege of the rich, whether it is a few thousand catties of cannon bodies or a few catties to dozens of catties of shells, none of them can be affordable by ordinary people in this era.

Although Zhao Zheng was able to smelt high-quality steel, the lack of mines made him limited to the ore he bought in the market, and some high-quality steel with good toughness and easy temperature could not be smelted at all.

"Dare to ask the lord, why does the cannon body continue to thicken from front to back?"

"Look at the drawings by yourself", Zhao Zheng said impatiently, and after a while he realized that this was Gong Duo asking, and he had always called himself "Brother Zhao".

"Brother Gong, don't blame, I meditated on artillery, and my attitude was inappropriate for a while."

"I don't dare to blame, but I ask the lord to explain."

Zhao Zheng laughed and said: "The previous thunder shook the sky, and Brother Gong should have seen that the energy of the gunpowder came from the explosion. Artillery uses this energy to condense it and fire shells.

However, due to the huge power of gunpowder, when the ammunition is promoted, the chamber pressure gradually decreases from the explosive part of the tail of the gun to the muzzle, so the upper tail part is designed to be thicker. ”

Gong Duo nodded frequently, pondered the principle, and even walked to the front of the cannon and rubbed the cannon body with his hands, repeating it several times from front to back, he said: "Since the tail chamber pressure is the largest, it is necessary to thicken it, and at most adjust the lower shelf, isn't it also very convenient?" ”

"It's not easy to say, the lord asked to cast a cannon that could be used in the military, in order to make it easy to carry, we tried to reduce the weight, if the whole body is thickened, will not all the work be wasted."

"Why thicken the barrel, just thicken the tail."

Gong Duo and Zhao Feng's vindictive questioning suddenly woke up a link in Zhao Zheng's mind. Since the artillery has the greatest pressure on the tail, it is enough to add the iron hoop.

Inspired by the water that bursts the embankment, Zhao Zheng was eager to start making it immediately, he simply squatted down and painted it on the ground with stones.

In the history of previous lives, there were also people who encountered the dialectical problem of portability and safety, but he thought of a brilliant solution to solve it. That is, after the gun body is cast, the tail is reprocessed to make the tail thicker, but the whole gun body remains unchanged, and it looks like a mille-feuille roll.

Zhao Feng and Gong Duo stopped arguing early, lowered their heads and looked at Zhao Zheng's "graffiti on the ground" carefully, Zhao Zheng's legs were sore, and he stood up, and said with a smile: "I finally didn't forget to clean it, you immediately copied this picture and started to make it."

In addition, do not use Tianzi No. 1 steel, choose some mixed casting with good toughness, first of all, to ensure its repeatability. ”

"That's right", Zhao Zheng scratched his head and said: "Try to cast the hundred-catty artillery in bronze, you can add some steel powder to it, but you must ensure flexibility." ”

Zhao Fengru received a treasure, smiled and saluted before leaving.

As for Gong Duo, he was completely stunned, he completely left behind the knowledge of bows and crossbows he had learned before, and had seen the devastated artillery, and the future must belong to the era of firearms.

He flicked his hem, knelt on the ground and said: "Gong Yi Duo is willing to swear an oath to his ancestors, and finally be loyal to the lord, please let me participate in the development of artillery." ”

In the Warring States Period, when science and technology were not prosperous, ancestors were second only to heaven and earth, and Gong Duo swore by his ancestors, which was enough to prove his desire for artillery technology.

Zhao Zheng accepted his gift safely, took his hand and said, "I don't care what will happen in five hundred years, let's open this Pandora's box together." ”

At the Gucheng State Guesthouse, Gao Yanli had already saluted and was about to leave, and after a few days of inquiry, he still couldn't figure out Zhao Zheng's strategic intentions. It was clear that he was preparing for a war, but he didn't know which country to start a war with, so he wanted to investigate, but the surveillance of the Gushan Army made him nowhere to explore.

"Gushan hides a big secret, I want Prince Ming to make plans early."

When Gao gradually left the solid city, he looked at the outlined city wall and said thoughtfully.