Chapter 279: Rifling

"Whoosh,." "Whoosh,." "Whoosh,." "Whoosh,." A terrible scream swept through the air, followed by a series of sounds of heavy objects touching the ground, "Bang." "Bang." "Bang." "Peng!" Boom. "Bang." "Bang." "Peng!", the heart trembled.

In a target area 300 paces away, the enemy phalanx made of tree branches was forced out of three wide and long gaps by high-spinning and jumping projectiles, and sawdust was all over the ground, and branches and leaves flew wildly.

"It's done, it's done, it's done." Before the projectile stopped completely, the master craftsman Jiao Yu had already rushed over like crazy, and he held a projectile whose surface was ground black, and walked back breathlessly, "Dadu Dudu, it's really done, inside the four, three ricochet bullets appeared, fifteen steps into the enemy formation, no, ninety feet deep, each jumping projectile smashed at least four targets, and all the other places that were touched by the projectile were all exposed white wood stubble." ”

"The effective firing range is three hundred, no, one thousand eight hundred feet, the ricochet formation rate is three-quarters, the governor is mighty, and if the rifling is useful, it is really useful, this copper-tired steel core cannon weighs only fifty pounds more than the original, and the effect and effect can be more than doubled." Refusing to let Jiao Yu be in the limelight alone, Huang Laowei also jumped up and added loudly.

The two of them are not very accustomed to calculating the length directly with a standard ruler, so they always stumble when they speak, but the meaning expressed is very clear, after the use of copper tire steel core and rifling technology, the artillery that can shoot four-pound projectiles, whether it is power or range, has been greatly improved, especially the richeting formation rate, at least more than half of the guarantee, not as it turned out, completely relying on luck.

"Probably more than double." As the chief instructor of artillery, Huang Lao Er also followed closely out of the enemy formation, walked to Zhu Chongjiu's side, first saluted a military salute, and then added loudly very professionally, "It turns out that the shell can also kill the enemy at 300 paces, that is, 1,800 feet, but at such a distance, even if a ricochet is formed, it can only hit two or three targets, and then it completely loses its strength, and this time, basically as long as it is hung by the projectile, it cannot be spared, and there is a target in the deepest part who is hit by the projectile head-on. The three-inch wooden shield split into six pieces. ”

"Then pull the artillery a little farther away, and fire a round every one hundred and twenty feet, and see what the maximum range is." Zhu Chongjiu first returned a military salute to Huang Laoer, and then commanded loudly.

"Yes." Huang Lao Er happily agreed, commanded his cronies, lined up, pushed the artillery carriage, and walked to another artillery position one hundred and twenty feet away.

As a group of veterans, the concept of ordering and prohibiting has long been deeply rooted in the marrow of each of them.

"Pay attention to monitor the temperature of the gun and the surface condition of the gun, the new projectile is coated with soft lead, which may be more likely to cause explosions." Zhu Chongjiu followed a few steps from behind and reminded loudly.

After coating the projectile with a layer of high-purity soft lead, the deformation effect of guò lead can be used to better seal the gun chamber, and then form a greater chamber pressure, so that the shell can obtain a greater initial degree when it is fired, but the disadvantage of this method is that the pressure and heat formed by the deflagration of the projectile are basically all blocked in the gun chamber, and the possibility of exploding the chamber is also greatly increased.

However, after the gun was changed to a steel core copper tire, the suddenness and damage effect of the bore were significantly suppressed, because the two metals of copper and iron are different in terms of expansion rate and heat transfer rate, once the barrel is damaged, the internal steel core and the external copper tire will not burst at the same time, so through the temperature measurement and the surface observation of the gun body, it is entirely possible for an experienced gunner to predict the damage process of the gun in advance and avoid the tragedy.

Compared with the previous lethality of the four-kilogram bronze cannon, Zhu Chongjiu would rather take a few more risks of exploding, at least, the current copper-tire steel-core rifled cannon can shoot a two-kilogram solid projectile four hundred and fifty meters away, and can form a ricochet with a high probability, although it is much worse than the red-clothed cannon of "one cannon goes down, kills the enemy, and erodes ten miles" in his memory, but it can be regarded as a real primary artillery, not like the original, at best it can only be regarded as a large musket, (Note 1)

"Whoosh,." "Whoosh,." "Whoosh,." "Whoosh,."

"Bang." "Bang." "Bang." "Peng!" Boom. "Bang." "Bang." "Peng!"

Just thinking about how to improve the copper-tired steel core cannon in order to reach the standard of the Franc machine in another time and space, a new round of test firing has begun, Huang Lao Er commanded the elite gunners under his command, and the two-kilogram projectile, changing various angles, kept hitting the preset target area, smashing the target area with smoke and dust.

The formation rate of ricochet is still more than half, especially when firing at an elevation angle between 30 and 40 degrees, it can even reach three-fifths or even three-quarters, because of the high rotation, the kinetic energy stored on the projectile also increases exponentially, even if it falls on the ground and does not form a ricochet, it will also roll high with an unpredictable trajectory, and cut down the target people in the target area like straw.

But at the same time, the frequency of artillery firing has also been significantly reduced, originally almost once a minute, but now even if it is operated by the most skilled gunner, it will take nearly one and a half to two minutes to be ready, and the spiral rifling not only makes the projectile load, it takes more effort, but even has to use the rag wooden handle of the gun chamber to hard top it every time, and after firing, the difficulty of cleaning the gun chamber has become more and more difficult.

"The 1,900-foot test launch has been completed, and the ricochet rate is 60 percent, and the farthest 90 feet deep into the target area is all effective killing."

"After the 2,000 and 40-foot test firing is completed, the ricochet rate is 50 percent and a half, the farthest depth into the target area is 80 feet, and the effective killing depth is 60 feet."

"The 2,160-foot test firing was completed, the ricochet rate was 40 percent, and the target area was 70 feet deep."

"Two thousand two hundred and eighty feet, ricochet rate"

"Two thousand four hundred feet"

Huang Lao Er ran around with a leather paper notebook, constantly summed up the number jù, and reported it to Zhu Chongjiu, the maximum effective range was 2,600 feet, that is, the distance of about 640 meters in another time and space, and the longest range was as high as 800 meters.

In addition, the landing point of the shells has also become easier to judge, and it is no longer as in the past, when there was no rifling, under the action of wind and other unpredictable external forces, there is a huge shift, and if more than 20 copper-tired steel-core guns are concentrated, it is entirely possible to carry out a covering strike on a specific area of 2,100 feet, that is, 350 paces.

"What is the temperature of the cannon body, if you can, try a round of flowering shells, be careful not to press too tightly." Zhu Chongjiu nodded with satisfaction and continued to order loudly.

"Yes." Huang Lao Er saluted, strode away, and after a while, he stuffed the pre-prepared flowering shell into the barrel of the cannon, and began to bombard the target area indiscriminately.

"Boom." "Boom." "Boom." The momentum looks quite huge, but the effect is very average, the cannonball with the lead ignition, it is still easy to be dumb because of the violent collision when it lands, and after the cannonball lands, it can not explode immediately, it always stays for a long or short period of time, and then suddenly jumps up, sweeping the area three or four steps away from the mess.

"If you see the projectile hit the ground and run for your life, there is at least a 30% chance of escaping." Without waiting for Huang Lao Er to come over to report, the master craftsman Jiao Yu had already poured cold water on himself, "If you shorten the lead as much as possible, if you don't wait for the shell to fly to the place, it will have exploded, and it will not have any effect." ”

"Then let's leave it for the six-pound cannon." Zhu Chongjiu thought for a while and casually ordered, "After you go back, let's see if you can change the six-catty cannon to a copper tire and steel core, and add rifling." ”

Without the touch fuse, the power of the flowering bomb can not be effectively waved, and how to make the touch fuse, he can not find any impression in the memory of another time and space, only know that it may be necessary to use thunder mercury as raw material, and the manufacture of thunder mercury requires concentrated nitric acid, and the manufacture of concentrated nitric acid involves the calcination of nitrate, or the reaction of sodium nitrate and concentrated sulfuric acid, concentrated sulfuric acid, it needs to be calcined with green alum, and where the green alum is produced, he does not know.

Talents, or need talents, in this era, can export chapters of the reader is easy to find, but understand the most basic chemical knowledge, I am afraid that only the Taoist priests in the mountain alchemy, and the entire Huaiyang area of the alchemy Taoist priests are all tied up, hand in hand to teach them to operate, can successfully produce nitric acid, I am afraid it has to be one in a hundred, but from nitric acid to thundermercury to the touch fuse, there is still a difference of 108,000 miles.

It would be nice if you could open a two-way wormhole and dock with Zhu Dapeng's time and space, any thing here is a priceless antique, and any thing over there can be called an artifact, there are two thousand Bayi bars plus twenty mortars, enough to sweep the world, why should I squat here and ponder what mercury thunderate and alum oil.

"That, that six-pound cannon was changed to a copper tire steel core, villain, my subordinates have already started to do it." Knowing that his own governor had a problem with distraction, Jiao Yu stood next to him for a while before responding cautiously, "But, but, the subordinates think that the top priority, the top priority, is to build, build a small cannon specially used to shoot scattered bullets, do not need to hit too far, can kill and injure targets within a hundred steps, use four-pound cannons to hit the distance when fighting, and when the enemy is close, use fire guns and small cannons to bombard, so that their archers will completely become decorations." ”

"Shotguns." Zhu Chongjiu was slightly stunned, and then the clouds on his face were swept away, yes, although he couldn't make a touch fuse in a short period of time, but Lao Tzu could completely make another big artifact, the tiger squat cannon, that was another time and space, Qi Jiguang and his old man's killer weapon to deal with the Japanese Bandits, it was definitely a large sweep at close range, and even the fire guns in the Japanese Bandits only had the share of fleeing from the wind, not to mention ordinary bows and arrows.

Thinking of this, he no longer ignored the melancholy of not being able to make a fuse, grabbed Jiao Yu's shoulders tightly with both hands, and grinned at the other party, "Build, even if you go to build it, no matter how much it costs, do your best to get it out for me, no need to take a hundred steps, as long as the effective killing distance is fifty steps, that is, above three hundred feet, I will give you credit." (Note 2)

Note 1: The range of the Franc machine in the middle and late Ming Dynasty varies greatly because of different models, but the basic effective range is more than 600 meters.

Note 2: Tiger squat cannon, Qi Jiguang when he was fighting the Japanese invaders, the improved small shotgun, according to the unearthed physical measurements, the caliber is 57mm, the length of the body tube is 42.3cm, can shoot 100 projectiles weighing five coins, it is recorded that the firing range is as high as more than 100 steps, that is, 150 meters above, but the effective range of the cannon should not be so far, if it is fired with black powder, it should be between 80 and 120 meters.

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