Zhao Peng clasped his fists and bowed his hand: "Please follow the last one in the future."

Li Zicheng turned his head and looked around and said, "Everyone follows me and follow General Zhao."

The group came to a dirt platform on the west bank of the Shihe River. Zhao Peng, Li Zicheng and others climbed to the platform. He took out the thousand-mile mirror from his sleeve and looked at Xiluo City, Shanhaiguan on the other side.

"The king please look at it. The Wu bandits used their original cannon stones to resist the thief slaves in the east, and all of them were submissive to Xiluo City. The bandits were dozens of cannons, raised the Shihe River, and two of the red and barbarian heavy artillery were used to suppress our army's cannons. The rest of the cannon stones were aimed at the stone river beach on the east bank. The river was wide open, and they were all pebbles. If I crossed the Shihe River beach, I would kill and hurt them." Zhao Peng pointed to the Shihe River beach and said to Li Zicheng.

"Can Qianli Miles Mile Use Orphans?" Li Zicheng asked.

"Please, King." Zhao Peng presented his hands with a thousand-mile mirror.

Li Zicheng picked up the Qianli Miles Miles and looked at Shanhaiguan on the other side: "What a good thing. Looking at things four miles away is like in front of you. Therefore, they are called Qianli Miles Miles."

"This is used by the Taixi people to sail and fight. If you get it from the sea, you will be far away." Zhao Peng replied.

"If you are on the sea, can you see a thousand miles?" Li Zicheng asked.

"Of course it is impossible. It's only a few dozen miles to climb, because the earth under our feet is round, and it's too far down the horizon, so it's naturally impossible to observe." Zhao Peng replied.

In this era, the theory of Diyuan has brought the Ming Dynasty by Western missionaries. Many people already know that the earth under our feet is actually a ball. Although Li Zicheng is not well-educated, he has been the leader of the rebel army for so many years and knows a lot.

Seeing the stone river beach on the other side, Li Zicheng was very worried that this kind of stone river beach covered with pebbles would have a multiplied lethality to his side once the Guanning Army shells hit it. The shells of that year were mainly solid shells, relying on bounce to kill targets. The shells hitting hard pebbles will not only increase the bounce effect, but also shatter the stones. The splashed stones will cause secondary damage to the Shun Army.

The Red Cannons in the Guanning Army's hand could range from more than three miles. The Shun Army advanced almost lightly when they went to Shanhaiguan, and did not carry heavy Red Cannons at all. The largest cannon was only a thousand kilograms of General Cannon, and most of them were Franchise aircraft with fast firing speed.

Seeing Li Zicheng's worried look, Zhao Peng pointed to the craftsmen who were laying out two sky-storm cannons behind him and said to Li Zicheng: "Please rest assured, you will have a sharp weapon to defeat the enemy. This cannon is called the sky-storm cannon. The Thai Red and Maoyi calls it a mortar cannon, which is specially used to attack the city."

Li Zicheng turned his head and saw that the two cannons were thick and short. He asked worriedly: "I heard that the older ones are, the farther they are. Can such short cannons be farther away?"

Regarding this, Zhao Peng really didn't know how to explain to Li Zicheng that the longer the barrel of the cannon, the higher the chamber pressure. The higher the chamber pressure, it means that the initial velocity of the shell is. However, the range of the cannon is not only related to the length of the barrel, but also to the elevation angle. Although the mortars of that year were sky-high cannons, it was not an elevation angle of more than sixty degrees like the later mortars, but an elevation angle of about forty-five degrees. Therefore, although the bore pressure of the mortars is not as good as that of the same caliber cannon, the range is farther.

The shells are accelerating in the barrel. Once the shell leaves the muzzle, the gunpowder gas no longer accelerates the shells, and the speed of the shells begins to slow down under the influence of air resistance. Therefore, the longer the gun barrel, the gunpowder gas can give the shells a larger initial velocity, and of course more fired drugs are needed to increase the chamber pressure.

In fact, these two sky-storm cannons that have been improved with gun mounts are not real mortars. The real mortar cannon barrel is shorter and can be used to fire flowering shells. Because the barrel is shorter, after the shell is loaded into the barrel chamber, the shell can be seen from the muzzle. The fuse of the flowering shell can be exposed. When firing the cannon, first ignite the fuse of the shell and then ignite the fire door, so that the flowering shell can be fired out.

However, the two cannons in Zhao Peng's hand are not real mortars, but are actually short-barrel cannons. The length of the cannon barrel still exceeds the caliber, so it is impossible to ignite the fuse of the flowering bullet from the muzzle. Therefore, Zhao Peng specially designed a special flowering bullet for these two cannons, which is a cork fuse flowering fire shell far ahead of this era.

The cork tube fuse flowering shell is when casting the shell, leaving a small hole on the head. After the shell is cast, the explosives are loaded into the shell body, and then the cork tube with the fuse is inserted into the hole and sealed with wax. A cork bullet holder is tied to the tail of the shell. On the one hand, it can prevent the direction from being installed in the opposite direction when loading the shell. On the other hand, the function of the cork bullet holder can close the dead barrel and increase airtightness.

Zhao Peng retreated from the earth platform and walked to the cannon position.

The gun position was arranged behind the earth platform. The gun position here could not be seen from the top of Shanhaiguan City. Of course, the gun position could not be seen either. However, there was a tower above the earth platform standing next to the gun position. Zhao Peng climbed up the tower and stood on the tower to look at Shanhaiguan. Just like when he last shot Qixing Village, he stretched out his arm, raised his thumb, and closed his left eye...

After measuring the distance, Zhao Peng got down from the tower, asked someone to raise the flagpole, hung a small paper-folded windmill on it, and then hung a thin wooden board on the flagpole. This is the weather vane and anemometer he made himself.

These two mortars have been tested by Zhao Peng many times and have used fixed-pack gunpowder. Zhao Peng and the craftsmen have made many thin pancake-like launching medicine bags. According to the data, the number of launching medicine bags can be put into the barrel, so that the speed of loading shells can be much faster. In addition, there are also different charging specifications of fixed-packing medicine bags, some of which charge a larger amount and some smaller.

Zhao Peng took out the paper and calculated various data on the paper.

Li Zicheng and others came up and saw Zhao Peng holding a goose feather in his hand and writing and drawing on paper. There seemed to be something inside the hollow pole of the goose feather. He drew lines and patterns on the paper.

"What kind of pen is this? It looks quite useful." Li Zicheng asked.

Zhao Peng replied: "This is a charcoal core goose brush. If you don't use a charcoal core, just cut the top of the goose feather and you can dip it in ink and write directly. This way, the lines drawn are much straighter than the brush."

In fact, Zhao Peng originally wanted to make a pencil, but he had to split the pencil into two pieces with a wooden pole and wrap the charcoal core in the middle, which was time-consuming and laborious. So he came up with a dual-purpose method. The quill can be placed in the charcoal core as a pencil. When it is not used as a pencil, you can dip it in ink to write directly.

It was very difficult to draw engineering drawings for brushes back then, and it was difficult to draw straight lines. It was far inferior to hard pens at this point.

Calculate the data. Charcoal pen is much stronger than brushes. If the charcoal pen is calculated incorrectly, you can directly erase and modify it. At that time, there was no eraser. Zhao Peng dipped his finger in water and wiped it on the paper. He could erase the wrong number and then write it again.

After completing a series of calculations, Zhao Peng asked Wang Xin and the craftsmen to start loading the mortar according to the data he gave. At the same time, two apprentices lowered the Hokage hanging on the wooden pole.

"We can't see the Shanhaiguan city wall here. Can we hit it accurately?" Li Zicheng asked.

"You don't need to see the target. Just calculate it and you can kill the Wu thief Red Cannon by shooting a cattle across the mountain! And the Wu thief's gunners can't see us, so they naturally can't reach us either." Zhao Peng replied with a smile.

After the apprentices loaded the fixed-load gunpowder, they first put a wooden board into the gun chamber, compacted it, then put a shell into the gun chamber, then stabbed a pointed cone through the fire door, pierced the medicine bag, and then inserted the medicine twist, and then completed the entire loading work.

The tower rose again, Zhao Peng climbed up the tower and said to Li Zicheng and the others: "King, generals, please climb up to the high platform ahead to watch the shelling effect."

Li Zicheng and his generals climbed to the platform ahead, while Zhao Peng stood in the tower to observe the effect of the first round of test shots.

"Fire the cannon!" Zhao Peng shouted.

An apprentice holding a torch pointed the torch at the medicine twist on the fire door. As the medicine twist shortened into the fire door, a dull roar sound came from the cannon, and the muzzle was sprayed with flames, and thick white smoke rose from the muzzle and the fire door.
Chapter completed!