A week later, in the north of Haizhou City, Huai'an Prefecture, Sanlipo, nearly forty miles from Kongwang Mountain, the three of them carried sacks, cloth bags cross-body, and each carried a circle of large bamboo tubes around their waists, sneaking into the woods.

This place is more than twenty miles away from Haizhou City, and sixty miles east is the shore of the Yellow Sea. It is not far from the official road. It is an excellent place for robbing prisoners.

"Let's be here!" Yang Yifei stopped on the plain in the forest, turned his head to look at it, then put the sack on the ground, and told Mao Shiba and Wei Xiaobao.

Upon hearing this, the two of them put down the sacks. Mao Shiba was carrying a small scale on his left hand, and Wei Xiaobao was wearing a cloth bag cross-body.

Those three sacks are the formula materials for making black gunpowder: saltpeter, sulfur, and charcoal.

In this era, saltpeter was mostly used by wealthy families to make ice and cool down in summer, while sulfur powder is a drug that is easier to buy.

Not to mention charcoal, now it is late autumn, winter is approaching, and there are charcoal sellers everywhere.

"Brother Mao, please crush all the charcoal and saltpeter into powder first." Yang Yifei took out a stone bowl from one of the sacks, and there was a stone pestle inside. People usually use this to pound things like pepper powder.

"Okay." Mao Shiba took the stone bowl and poured out the bag of charcoal. The sack was spread on the ground to contain charcoal powder, and then pounded it into pieces.

The era of black gunpowder naturally existed long ago and was relatively mature, but Yang Yifei still looked down on it because the formula ratio has not yet reached the most perfect level.

Although China had already mastered the main components of gunpowder in the Song Dynasty, it was not mature in terms of ingredients distribution ratio.

In addition to the three ingredients of saltpeter, sulfur and charcoal, it is also mixed with ten ingredients such as clear oil and maru.

These ingredients are mainly flammable substances. When used in military use, they are mostly used for fire attacks, which shows that the Song people have not yet fully recognized the explosive performance of gunpowder.

The composition of gunpowder in the Yuan Dynasty was more reasonable, and the combination ratio of gunpowder was more scientific, of which saltpeter accounted for about 60%, and sulfur and charcoal accounted for about 20%.

The ratios in the Ming and Qing dynasties were more reasonable because they had fully realized the explosive performance of gunpowder. Except for saltpeter, sulfur and charcoal, no longer mixed with other materials, but the ratios were still different and failed to reach the extreme.

After hundreds of years of experiments and practices, until modern times, people finally determined that the most scientific and reasonable ratio of black gunpowder is 75% saltpeter, 15% sulfur, and 15% charcoal.

The explosion power of gunpowder produced in this ratio is the greatest. Compared with the explosion power of C4, that is, TNT, the explosion power is 1:0.6.

In other words, two kilograms of black gunpowder can exceed the power of one kilogram of C4, and what is the concept of one kilogram of C4?

A kilogram of C4 explosion can generate 4.2 million joules of energy, which can move a kilogram object 420 kilometers, or a 100 kilogram object 4.2 kilometers.

Of course, this is ideal, that is, all energy is converted into kinetic energy.

Among the thermal weapons of later generations, a 76mm high-explosive shell was charged about one kilogram, which could turn a small two-story house into ruins.

This is still the steel and concrete house of later generations. If it were a wooden house of this era, one kilogram of C4, as long as it was properly laid, it could blow up a house of 300 square meters.

The charge of a grenade is about 50 grams, and it is not left within a diameter of 10 meters. One kilogram is equivalent to 20 grenades explode at the same time.

Of course, this is the power of the broken fragments to kill. If it is just shock-detonation, the killing range is actually only three or four meters, that is, the diameter is about one meter. The offensive grenade is almost the same.

This is a relatively large comparison. After all, the power of gunpowder explosion depends on various factors, such as the clothing, sealed state, etc.

The so-called thunderbolt bomb that Yang Yifei wanted to make was commonly known as the "dog bomb" in the southwest region of later generations.

This dog bomb does not require fuses or detonators to detonate, and is also very convenient and simple to make. Yang Yifei played with his father when he was a child.

The so-called dog bomb is to wrap a ball of black gunpowder in tin foil or soft cigarette box, tightly wrap it tightly, and explode when it hits the ground. Some people who are more harsh and even put some broken glass residue or stones in the gunpowder, just like earthen grenades.

Because the southwest region has many mountains and dense forests, there were many wild dogs and jackals on the mountain in the 1970s and 1980s, basically every household in the mountain had muskets and dog bombs, which were specially used to blow wild dogs, so it was named this common name.

As the years have been hunted by villagers, wild dogs and jackals gradually disappeared, and they were basically out of sight in the 1990s. The muskets and powders of every household in the village were also confiscated by the state, but the method of making dog bombs was preserved.

Although there is no large amount of gunpowder, people always have ways. Some young people who love to play will buy a lot of firecrackers, then pour out the gunpowder from the firecrackers bit by bit, pour a small bag into a dog bomb, and experience the feeling of playing with a bomb.

Until now, there is a kind of firecrackers that are specially used for children, which is the principle of dog bombs. The firecrackers do not have fuses and explode when they hit the ground.

The dog bomb came to Yang Yifei's hands, but it became a tall "thunderbolt bomb" to bomb people. This is also the most glorious time for dog bombs.

It’s not that Yang Yifei won’t make more powerful things, but this thing is the most convenient and easy to use. It will explode when thrown out and hit the ground. There is no need to ignite the fire. Although the power is a little less, it is also suitable for use.

What's more, the power depends on the amount of medicine used. Dog bombs may not be less powerful than grenades, but they are not as safe as grenades.

If you fall to the ground accidentally, you may feel depressed (so please don’t try to play this, it’s not only dangerous, but also illegal).

...

After Mao Shiba crushed all the charcoal and saltpeter into powder, Yang Yifei raised his small squat, but did not take action. Instead, he stared at Wei Xiaobao who was squatting aside and watching with interest.

"Brother Yang, why are you watching me? Hurry up and make thunderbolts!" Wei Xiaobao asked inexplicably by Yang Yifei.

Mao Shiba, who was beside him, rolled his eyes to the sky, walked over and grabbed his shoulders, and dragged him away.

"Oh, it hurts... Let go, let go, what are you doing, Brother Eighteen?" After walking several feet away, Wei Xiaobao rubbed his shoulders and glared at Mao Shiba in anger.

Mao Shiba stared at him and shouted in a rough voice: "Making thunder bombs is Brother Yang's unique secret technique. You are not from Pili Hall. It is a taboo for others to secretly learn martial arts and secret techniques of other sects. Do you understand the rules of the world?"

Wei Xiaobao shouted with confidence: "I am not a person in the world, so of course I don't understand the rules of the world. Don't you have to say it? You will touch me, hum."
Chapter completed!