It was also an experiment, but this time, the distance was a little farther away, about 20 meters or so, after Sun Ji stepped forward and lit the fuse, everyone quietly waited for the effect of the tree cannon, the fuse burned rapidly, and finally when the burning ended, a sound much smaller than the previous black powder explosion sounded, like a muffled thunder on a dry day, followed by the sound of gold and iron and smoke. Pen & Fun & Pavilion www.biquge.info

In fact, most artillery pieces are not as loud as explosives igniting, for the simple reason that the breech will absorb part of the sound waves, and the structure with trees as the main body makes the sound even quieter.

The sound is small, it does not mean that the power is not great, the sound wave can be eliminated by some methods, the power is helpless, when the power is scattered in all directions, and after being concentrated in one direction, the power becomes greater.

You can refer to the flashlight, the bulb of the general flashlight, the wattage is not high, but it can create a strong light in the area, which is the benefit of concentration, and the tree cannon, obviously uses this.

3.5 catties of gunpowder, pushing 30 rounds of steel bullets, scattered forward in a more concentrated direction, because it is a scattered bomb, at the time of 20, it has expanded to a width of 10 meters, just to include most of the test area, the sound of swishing is endless.

Of course, Zhao Xin knows the shape of the bullet, the pointed bullet has stronger stability and higher penetration, but the tree cannon is not rifled, and it is impossible to determine the more stable flight direction.

After a mess, they approached the test area, Sun Ji and the others were stunned, because there was a mess in front of them, and the Buren armor was worthy of the title of heavy armor in this era, even in the era of hot weapons, 45 kilograms, and the heavy cold forging armor with a thickness of more than 2 inches was enough to withstand most of the light firepower attacks, but the physical fitness of people at that time, as well as the output of steel, could not be hunted on a large scale.

The tree cannon, to put it bluntly, is a large shotgun, but it is built with trees, no forging, you can cut down trees directly, and the manufacturing is relatively simple, as long as an assembly line is formed, the speed will be faster.

The power of gunpowder was concentrated in the tree cannon, pushing the steel balls to fly forward, and on the front step armor, at least 4 steel balls were hit, not penetrated, but it did not mean that it was useless, because the four hit positions, the iron armor has been significantly deformed, this kind of armor built with iron sheets, the armor like the clothes that are braided, the most feared, is the attack of blunt weapons, which is also the source of the great threat to the Northern Song Dynasty after the establishment of the Jin State.

Jurchens, barbarians, in the era of cold weapons, the more northern, the more backward and barren the place, the stronger the strength of the individual, the higher the proportion of Hercules, plus it should be a forging process, dexterous and sharp knives, spears and the like, they can't make them, they can only use maces, iron rods and other heavy weapons. Such a heavy weapon, for the step armor, is inherently restrained.

The tree cannon also showed such a role, the deformed step armor, as if it had been smashed by a sledgehammer, the iron piece had been obviously deformed, obviously, the person who had been hit hard, and the person in the armor, unless he was talented, must have been killed or injured under such an attack.

Even the heavy infantry armor is like this, other armor, even more so, the chain mail is even worse, he himself is made of wire, for small arms, there is a certain resistance effect, in the face of weapons that can penetrate heavy armor, directly broke a big hole, not to mention armor and paper armor, relatively speaking, the effect of paper armor seems to be a little better.

The reason is very simple, the paper armor is thick enough, the flexibility of the paper, will also bring a huge cushioning effect, in the face of heavy blows, eliminate some of the force, once the kinetic energy is exhausted, stop the iron ball, the killing effect of the iron ball, but very small.

This can be seen from an iron ball that hit the paper armor, it has just penetrated, but the round iron ball does not have lethality at all, but there is no one inside, so it penetrates, in fact, this tree cannon has little effect on those wearing thick paper armor.

Sun Ji and the others didn't care, Zhao Xin didn't break it, at present, paper armor is his unique thing, there is no need to consider the protection of paper armor, it looks like a simple paper armor, involving the selection of paper, glue adhesion, and a series of processes such as overall molding, it is not as simple as it seems.

Even if it is learned by the opponent, in a short period of time, it will not be able to put it into action, and the rebels will not be able to carry a large number of baggage, or a large number of paper craftsmen, to come and replace the heavy infantry armor with paper armor.

The first appearance of the tree cannon was perfect and amazing, even Sun Ji didn't expect that there was only sound before, and the explosion was relatively loud, but the explosives with low actual damage would have such an effect, he didn't understand why this was the case, but he knew that this was a sharp weapon to defend the city.

A 2-meter-long tree cannon, plus a steel hoop, the total weight is larger, there may be hundreds of kilograms, the range is close, it is not suitable for field use, when it is really encountered, it can't take him out, but in the defense of the city, it is a natural advantage, as long as the speed is fast enough, in a certain period of time to a shot, the power is amazing.

Especially for the attack power of the infantry armor, the infantry armor has always been what he is more worried about, among the forbidden troops of the Yunyi Army, which one is the more sophisticated, the infantry armor has a total of 1500 sets, and the 1500 main forces will be the focus of the siege.

The longbow, for unprotected targets, or the same leather armor archers, has a huge lethal effect, but the attack on the infantry armor is limited, and the soldiers wearing heavy armor can completely cover the face and ignore the attack of the longbow, even if it is equipped with heavy armor-piercing arrows, it is only to attack some weak links of the infantry armor.

Now there is a powerful tree cannon suitable for defending the city, and of course I can't put it down.

Zhao Xin saw the effect of the tree cannon, so he simply asked Sun Ji to play, and told Sun Ji some precautions, one is to light the fuse, quickly go to the explosion-proof bunker, second, to clean the cannon chamber every time to prevent the remaining incendiary materials, causing unnecessary explosions, and the third is to try the strength of this tree cannon, how much is there.

The wooden structure, even if it can support the explosion for the first time, after a long time, the accumulation of damage again and again is quite terrifying, and it will definitely fall apart eventually.

However, Zhao Xin somewhat ignored the strength of the tree cannon he made, the tree cannon he chose was already a mature tree cannon, not only had good sealing, but also a perennial arbor in the selection of trees, with high density, plus the steel hoop outside.

It can't be said that there is no high-quality steel in the Northern Song Dynasty, even if it is not at the smelting level, the meteorite that flies down from the sky, as long as there is a part of the outstanding performance, it can be the raw material of the divine weapon, and the iron hoop constructed with the so-called divine weapon is strong enough, and the flexibility is good, which can share the energy of the gunpowder to a large extent, and finally, after 50 cannons, this tree cannon will explode.

Hearing the final result, Zhao Xin was a little surprised, the durability is too strong, it can't be compared with the 3,000 rounds and 5,000 rounds of mature steel cannons in later generations, compared to the early iron cannons, it is already good, this seems to be extended.

Zhao Xin was worried that the strength of the tree cannon was not enough, he thought that 15-20 guns were already the limit of the tree cannon, but he didn't expect that it would eventually reach 50 guns, so if you load a little more 7-8 catties, you should be able to use about 3 catties of solid iron balls.

From a shotgun, to a single cannon, this is a pioneering feat, there is no tree cannon, dare to play like this, most of the tree cannons, are large shotguns, used to make up for the lack of artillery, lack of attack power.

Single-shell artillery, there are many things involved, first of all, it is the gun chamber, it must be stuck in the iron ball, the spiral and rifling are not necessary, the strength of the trees is far from reaching the level of steel, even if there is, it will quickly wear out, it is not as good as a smoothbore gun.

The firing range of the artillery is related to the length of the barrel, as well as the amount of charge, for the time being, under the premise of no nitrocellulose, it is okay to use black powder, but it must be treated, through water treatment, mixed evenly, to form granular gunpowder, which can be burned as completely as possible and reduce residue.

These are only Zhao Xin alone, under a series of dazzling orders, one by one, the 3-meter-long tree was brought to the carpenter's workshop, after the intense processing of several masters, it took more than a day to complete.

Compared with the previous tree cannon, the caliber is smaller, before it was a casual shotgun, the caliber is very large, about half a foot, now, only about 5 centimeters of the metric system, almost four or five times the previous one, the production is more detailed, and with a variety of coatings for internal reinforcement, to ensure the internal strength, more, are thick, greater thickness, can increase the strength of the barrel, the key to the group is the iron hoop, from the original few to a dozen, almost on the barrel, every other tie or so, is an iron hoop, It's still the kind of thickened and bold shape.

The cannonball is also specially made, a solid steel ball, the weight is not low, the whole round, just a little smaller than the caliber, put into the artillery, the airtightness is better, and the gas produced by the gunpowder will all be pushed behind the iron ball to increase the propulsion. The medicine room in the rear can be filled with gunpowder of less than 12 catties to ensure sufficient propulsion.

To tell the truth, after the successful production of the scattered bomb tree cannon, Sun Ji also thought about what the power would be if the scattered bullet was turned into a single bullet, but he didn't say much, the weapon manufacturing, it felt the same, it may not be the same, but he didn't expect that in a short period of time, Zhao Xin brought him such a big surprise, with previous experience, especially after the 100 cannon blew up the tree cannon, he was also addicted to this thing, and offered to try the power of this tree cannon.