As for the related industries in Chang'an City, including steel, chemical and military workshops, they were directly changed by Li Chengqian into a technology development research center. In the early stage, the mode of mentoring and apprenticeship is adopted, and centralized training and learning experiments are carried out, and then trial production tests are carried out.

Li Chengqian participated in the whole preparatory process of the entire arsenal these days, and in a week, with the efforts of Wang Xuance and all the craftsmen, the arsenal was completed and began to carry out small-batch trial production, of course, it was impossible to produce a large number of them. The point is the lack of raw materials for ammunition.

For a whole month, six qualified three-inch (100 mm) guns and three qualified two-inch (60 mm) guns were produced in the process of continuous improvement. Yes, there are more defective products with small calibers. This also exposes the backward level of process manufacturing.

The good soldier is also a bad weapon. How can you not try such a good thing? Everyone present, including Changsun Chong, Du He, Fang Jun, etc., were all teenagers and made a lot of noise. Li Chengqian's heart was also itching, and after thinking about it for a while, he had to order a few special forces to use mules to carry two cannons of different calibers to the trial site. Why Special Forces? Because only they have received training and guidance from Li Chengqian, and have been tested in Chang'an.

Li Chengqian was not too sure about these products, so when he redesigned them, he thickened the inner wall of the barrel, and each part was double-insured, so it was particularly cumbersome compared with later generations. For a two-inch gun, the weight of the weapon itself alone reached seventy catties, far exceeding the weight of thirty catties in later generations.

Looking at the cannon body erected at a 45-degree angle, as well as the sandbags and bunkers prepared in advance, Li Chengqian's hands were also full of sweat. The leader of the special forces squad is a young man in his twenties and about 20 named Chang Yucheng. He was the first special forces soldier to receive Li Chengqian's gun training and hand-eye ranging instruction.

In fact, the structure of the mortar is not complicated, and the operation and use are also very simple, after observing and aiming at the target, Sanyu Cheng took the shell from his companion's hand, slid the mortar shell from the muzzle into the barrel, followed by the two turned around, covered their ears, and squatted behind the sandbag.

With a loud bang, except for Li Chengqian, everyone was terrified, this was simply the birth of the thunder god, and before everyone came to their senses, under Li Chengqian's instructions, there was another sound. Sanyu kept adjusting the gun carriage and changing the angle of the gun body. Shells kept being fired. The ten shells that were brought out soon were depleted.

San, with four team members, began to run towards the target and record the data. In less than an hour, the record was sent to Li Chengqian's hands, looking at the record, Li Chengqian grinned, for a two-inch shell, the whole bullet is one foot two inches long, weighs five catties, the range is as close as 40 zhang (130 meters), the farthest is 520 zhang (1700 meters), and the effective killing radius is two zhang four (8 meters), although the parameters of later generations are nearly thirty percent smaller, but what kind of rotten craft is this, to speak from the heart, I feel very good, it is really unexpected.

"Lang Jun, how did this so-called cannonball you made fly out, how did it fly so far." Fang Jun was already shocked, and the first one ran over and asked.

Changsun Chong also jumped up, ran over and asked, "This thing is too powerful, if you go down with a few shots, the city wall can also be blown up, how did you do it?" ”

Du He was not in a hurry, walked to the cannon, looked left and right, and really couldn't see anything famous, except for a firing pin in the barrel, there was really nothing to see.

Looking at everyone's faces, Li Chengqian was not hypocritical, and directly pointed to the shells and explained to them: "All mortar shells have tail fins. In addition to the tail fin, it also includes fuzes, detonators, explosives, bomb bodies, closed air rings, basic medicine tubes, additional charge packs, primers and other parts. ”

Then he pointed to the barrel and continued: "The shell is fed into the barrel, and by its own weight the bottom of the shell hits the firing pin at the bottom of the barrel; When the primer is fired, the basic charge tube at the tail of the shell is ignited, and then the gunpowder tied to the additional charge bag on the outside of the shell is also ignited. Although there is a certain gap between the shell and the barrel to ensure that the shell can slip off, the closed air ring on the outside of the shell can still create a great pressure in the chamber, pushing the shell out of the muzzle and towards the target. ”

Duho looked at the cannonball, then at the barrel, and then asked, "Why do you have a few small wings in the cannonball, and this is what you call the tail?" Is it for good looks? ”

Li Chengqian shook his head with a smile and said: "The firing principle of this kind of cannon determines that the shell cannot be closely attached to the barrel, so it cannot stabilize its flight direction, so it has to use a tail stabilization device to ensure its flight attitude, just like an arrow shot." ”

Several people nodded as if they didn't understand, but in fact, they were all at a loss, and the explanation was exactly the same as not explaining. Without a knowledge base, Li Chengqian could not explain it clearly. Then he instructed Chang Yucheng to continue the test of the three-inch cannon. The three-inch cannon was heavier, weighing more than 140 pounds. Although compared with later generations, the power and range have decreased by nearly forty percent, but the overall level has met its own requirements, and the range of the three-inch gun has reached more than 1,000 zhang.

Although Wang Xuance was not surprised, but thinking about Li Chengqian's experiments, and then looking at these two kinds of cannons, he couldn't help but think in his heart, the prince wants to make even smaller, if this is shrunk enough to be able to hold it in his hand, isn't it invincible?

He was thinking about it, and Du He kept gesturing, gesturing and talking to himself: "If you hold this in your hand, what kind of martial arts will you learn, whoever catches up will spray whom, and when the time comes, you will take a troll, and you will go anywhere in the world." ”

When Changsun Chong and Fang Jun heard this, they looked bitter with a bitter face, and said in their hearts, what they said is also what they said, with a gun in hand, I have it in the world.

Li Chengqian smiled, shook his head, ignored these people, and then took out a grenade, called a few special forces over, and began to explain step by step, several times in a row, and began to demonstrate while talking. Open the safe, hold the grenade, and throw it vigorously at the target dummy in front of him, followed by a bang, which stunned several people for a moment.

Damn, really? Except for Wang Xuance, everyone is not calm, is this okay? If you take a few with you, you can't run rampant in the world? Just as a few people were shy and ready to step forward, Wang Xuance smiled and said, "It looks good, but it's a pity, in case it is not handled well." This thing blew up on the body, so isn't there no bones left? ”

Li Chengqian also smiled and said to everyone: "I just demonstrated to everyone for a long time, just to prevent such a thing, after all, this grenade is the most dangerous thing, if you don't pay attention to it, there will be problems, therefore, for this thing, don't think about it, after a while, when the gun is made, everyone will be satisfied." ”