"Given by the Lord God, an indestructible artifact!...The cannon exploded...the chamber exploded..."

A group of crows flew across the high sky, leaving behind a burst of "quack" cheers. Xiulot sat under the ceiling of the large tent, pinching the letter from the foundry master, his face turning blue and purple. After a while, he calmed down, took a deep breath, and read patiently again.

"Your Majesty, more than two years ago, you left behind a lot of fragmented and vague revelations, and mentioned the stubby mortars specially used for siege..."

"Scattered and messy, unclear words." Seeing such a blunt comment, Shulot raised his brows and clenched his hands tightly.

However, this is also true. In many cases, the so-called "divine enlightenment" is just his impression of the correct technical direction, and then describes the shape of the creation. As for how to realize it and what the technical details are, professional master craftsmen must slowly explore and solve difficulties one by one.

And in such a process, the improvement of the abilities of the master craftsmen is obvious. Just like Tiripi who explored casting cannons, he has accumulated a lot of experience in casting cannons for many years, and he is even able to independently research and manufacture mortars.

"...You said that the length of the gun barrel determines the range, the caliber determines the power, and the weight of the gun body affects the maneuverability... For heavy artillery for siege, the larger the caliber, the better, and the range is second. Of course, the siege gun The weight can be increased, as long as it can be transported, even if it is slower..."

"According to this idea, I designed a new siege mortar. Its length is about one and a half meters, its diameter is between seven and eight inches, it holds thirty kilograms of stone bullets, and it weighs more than 800 kilograms..."

Seeing this, Xiu Luote contemplated and drew a pen to calculate.

A bronze cannon with a length of one and a half meters and a caliber of seven or eight inches, that is, 22-26 centimeters. The stone bullets that fit the mouth are about half a catty of 6-6.5 cm stone balls, with a volume of about 1,000 cubic centimeters. According to the standard density of stone, 2.8 grams per cubic centimeter, the closed mouth bullet is indeed about 30 catties. A stone bomb of this weight, converted into pounds, would be a full 33 pounds! And if it is replaced with a joint iron ball with a density of 2-3 times, the power is...

"Well, the iron bullets widely used in Europe are still too extravagant for the current alliance. On the contrary, the alliance has enough manpower to polish the stone bullets. After the stone bullets hit the city wall, there will be shattering splash damage , is more suitable for the current alliance..."

After pondering for a while, Xiulot estimated and drew the shape of the bronze cannon on the straw paper.

Bronze is three times denser than standard rock, at about 8.4 grams per cubic centimeter. The 800-jin bronze cannon is about 50,000 cubic centimeters. According to the calculation formula of the hollow cylinder, the inner diameter is 12-13 cm and the length is 1.5 meters, then the outer diameter is...

"A gun with an outer diameter of 24-25 centimeters? A wall thickness of 6 centimeters?"

After counting this, Shulot showed surprise on his face. Such a short, short and thick artillery is simply...

"It's just a lump of bronze! This...the Kingdom's cannon-casting technology still has a lot of room for improvement! Huh... With the current technology, it is the only choice."

Holding the pen, Xiu Luote stared at the bronze cannon he had drawn, and after a long while, he put a "tick" at the bottom. Then, he looked at the letter again.

"Your Majesty, the difficulty of casting this kind of thick and short artillery is much easier than that of long-barreled artillery. Although it took a year or two for the Cannon Foundry Bureau to make the first one. But with this template, it can be made this year. Three...no, five!... Please wait and see, even if I, Tilippi, risk my life and exhaust my apprentices, I will build enough siege cannons for you!"

The straightforward cannon-casting master made written evidence and made promises that may not be reliable. Then, with a tone of half excitement and half panic, he described the details of the test.

"When we tested the cannon for the first time, we used five catties of gunpowder and fired it at a forty-five-degree angle prescribed by His Majesty. The range of the thirty catty stone bullet was about one hundred steps, and it smashed one and a half catties on the ground where it hit the ground. A deep pit of meters...The second test of the cannon, adding ten catties of gunpowder, took more than two hundred steps, fell in the woods, and broke several big trees! Your Majesty, this range is enough to reach the bombardment of the city wall , without worrying about the crossbows at the top of the city!"

Seeing this, Shulot's eyes flashed. According to the parabolic formula, the range of the projectile is related to the square of the muzzle velocity and is affected by air resistance. The kinetic energy given by the burning of ten catties of gunpowder is about twice that of five catties of gunpowder... No, considering the possibility of incomplete combustion, it should be less than twice. The kinetic energy is proportional to the square of the initial velocity, that is, proportional to the range, and the air resistance is added...

"If the range of five catties of gunpowder is less than a hundred paces, then ten catties of gunpowder will definitely not be able to reach a range of more than two hundred paces... Tilipi, my casting master, you are patting your chest and talking big again! . ..Moreover, such a range, even for a mortar, is a bit small. The airtightness of the fire needs to be strengthened..."

Shulot picked up the pen and wanted to write down the reply to the admonishment. But after pondering for a moment, he put down the pen again and didn't write any words of criticism.

The last paragraph of the letter is the details of the artillery explosion, only a few simple sentences.

"Blessed by the Lord God! This mortar is so powerful that it is like the thunder of the Lord God. It shatters all the wood and stone, and even the city walls cannot withstand it!...The craftsmen of the Cannon Casting Bureau and the Gunpowder Department were very excited. Everyone unanimously decided to test Check the upper limit of the artillery range. Director Talaya also nodded in agreement and provided a new type of gunpowder..."

"But I underestimated the power of the new gunpowder, adding a full fifteen catties... This caused the explosion and killed two gunners. I have already paid compensation to their families... Supreme Your Majesty, please be merciful and forgive me for my ignorance!..."

Seeing this, Shulot lowered his eyes slightly. Although Tiripi exploded his chamber and killed a person, we still have to give great encouragement and generous rewards to such an outstanding cannon-casting master. Of course, this will have to wait until the new mortars really arrive at the front line and show the power to destroy cities and countries!

"Your Majesty, when this letter arrives in your hands, the new batch of mortar molds should have been drying in the shade. This time, I will thicken the wall of the artillery again, increase the weight to a thousand catties, and then Tighten the copper hoops on the periphery! And with such reinforcement, this siege cannon must be able to fire heavier stone bombs, load more gunpowder, and shoot to a longer distance! They are bestowed by the Lord God, His Highness God inspired , an invincible artifact!..."

"Huh? A thousand catties of mortar..."

Xiulot picked up the pen, and UU Reading www.uukanshu.com made some calculations. With the addition of two hundred catties, the wall thickness of the cannon has increased by 1 centimeter, and the toughness will be further improved.

"Ha! Tilippi, my master cannon maker, you are on a stupid road, and you will never look back..."

Shulot laughed dumbfounded. Then, he began to calculate, 45-degree parabolic shooting, the height of the shell is about half of the range. And if it is possible to fire 33-pound stone bullets to a hill more than a hundred steps away and a height of more than a hundred steps, then the formidable White Snake Hill City in front of you...

"Phew! If there is such a heavy artillery... all the states and cities in the world will be like a weak girl in front of the kingdom's legions, and there is no power to stop them!"

Xiulot's expression became severe, and he put down the letter. He stood up, walked out of the big tent, climbed up to the watchtower in the camp, and looked at the sky in the northeast. There, a solid hill city, like a tortoise waiting to be slaughtered, was huddled in its shell. At this moment, a group of warriors from the kingdom were escorting two really weak girls into the camp slowly.

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