Chapter 51 stub

Yu Xiaotian gave Blackhead two months. When he went to sea, he added enough supplies to his ship and equipped the soldiers with two tiger squat guns to strengthen their firepower on land.

Just two days after sending off the black head, Yu Xiaotian got two good news in a row. One is that Zhao Mazi's fleet, who sent to Foshan, Guangdong, returned to Nanri Island before the holiday, and their trip to Guangdong was quite smooth. Although they met two pirates trying to rob the ship on the way, When their fleet was all in the same group, they all retreated in the face of difficulties.

Several ships of goods brought were also successfully sold in Guangdong. After finding the Feng family, they purchased more than 20,000 catties of fine iron from the Feng family. The Feng family was very satisfied with this business and gave a fair price. And told them that as long as the sea wolf still wanted raw iron, they could continue to find the Feng family and dared not say that they wanted it. How much, but it's not a big problem to provide them with at least 500,000 catties of refined iron a year.

In this way, the problem of iron shortage in Nanri Island has been greatly alleviated, and the casting cannon is no longer short of raw materials, including other iron projects, which have also been greatly alleviated.

In addition to raw iron, they also purchased thousands of kilograms of cooked iron, which greatly met their needs.

The second good news is brought by Zhang Blacksmith to Yu Xiaotian. Since he arrived in Nanri Island, Zhang has been devoting himself to the construction of the bar.

This blacksmith can be said to be an iron idiot. He likes to study iron. In addition, Xiaotian also tells him about the process of building a pipe from time to time.

Zhang blacksmith began to explore according to the ready-made samples and the process of building the pipe he told by Yu Xiaotian, and Yu Xiaotian was also tossed by him.

At first, the quality of the gun tube he made was not good, but with his continuous efforts, coupled with the continuous transformation and production of some new tooling to build the tube, the craftsmanship became more and more refined. By the end of the year, he finally successfully built a usable gun tube and loaded with gunpowder for testing.

When Yu Xiaotian heard the news, he was so happy that he almost fainted. At present, he has solved the problem of artillery. The next step is to wait for a large number of casting. Now someone has helped him solve the * problem, so he can basically achieve the self-sufficiency of weapons in the future.

So he immediately ran into the iron work to see the first available pipe created by Zhang Blacksmith for him.

This pipe is more than four feet long, about one meter and a half, weighing three and a half kilograms. The diameter of the inner part of the pipe is about 15 mm, which is built according to Yu Xiaotian's idea. The outer diameter of the pipe is hexagonal. At the tail of the pipe, there is a screw that closes the tail of the pipe, and there is a small hole on the right side of the tail of the pipe, which is The fire door of the tube.

Yu Xiaotian took the tube and observed carefully. The whole tube was made very straight. After unscrewing the screws behind, he observed the inner load pipe with light. It can be seen that the inner tube is drilled very smoothly.

This barium tube is built quite well as a whole. It is also in the way that Yu Xiaotian said. First, the thick iron is repeatedly hammered into fine iron, then beaten into iron pieces, rolled the iron pieces on an iron bar, knocked and wrought to catch the interface, and then made a thick iron pipe. Outside this iron pipe is heated and forged into One, after completion, use the drill bit to make the drill smooth and straight, then tapping the wire at the back, installing screws to seal the tail, and opening a fire door. This pipe is considered complete.

is easy to say, but difficult to do. This requires the high skills of the craftsmen who make the pipe, and it takes more than ten days to make a lot of special tooling to create a qualified pipe. If the craftsmanship is not good, the scrapping rate of the pipe is very high. It's good to make one.

Zhang blacksmith also kept exploring before he gradually learned this skill, which also has a good relationship with the foundation of his iron technology. Otherwise, it is estimated that he will have to grope for half a year, and he may not be able to build a qualified pipe.

In Zhang's view, this time he can create such a qualified barium tube, and Yu Xiaotian's contribution is also very much. Many things he told him are very useful, so that he can explore by himself without detours. He can directly follow the path pointed out by Yu Xiaotian and gradually test it to make such a useful barium tube so quickly.

Although Yu Xiaotian doesn't have the skill of hitting iron, even if he gives him good materials and asks him to hit a knife, he may not be able to do it. However, he knows a lot about things. Sometimes what he needs to promote a technology forward is actually just an idea. After having an idea, it is not very difficult to achieve it technically. However, as long as it is not a leap that greatly exceeds the technical level at that time, it is possible to achieve it.

And Zhang blacksmith also learned a lot about gunmaking from Yu Xiaotian. Naturally, he took a lot of detours during the trial production, which made him succeed in a short time. In addition, Zhang blacksmith has never told anyone about it. In fact, he is a craftsman and his ancestors are craftsmen. In the past, his ancestors knew how to build three-eyed gun, but Zhang himself mastered some skills related to building fire gun.

Later, for some reason, Zhang Blacksmith ran to Donghai Village without permission. Zhang Blacksmith has never mentioned this matter to anyone.

With these foundations, Zhang's blacksmith has unique and natural advantages when groping for building a bird's tube, which is why he successfully built a tube in a short period of time with some theoretical knowledge and a few ready-made samples.

After Xiaotian's inspection, no problem was found, and Zhang has tried to shoot this tube several times, but no problems such as explosion or cracks have been found, so there is no problem with the practical safety of this tube.

But this barrel is only a barrel at present, and other parts have not been assembled to form a practical fire rope gun, so during the test shooting, it can only be fixed on a wooden table with U-shaped nails and aimed at a wooden rake in the distance for launch test to test the hammer. The safety and shooting accuracy of the tube are fine.

Yu Xiaotian went to watch the landing point of the bullet hole of the wooden target again. Because it was fixed on the table for aiming and firing, it avoided artificial effects on accuracy. The landing points of several rounds on the wooden target were very dense, basically concentrated in the white bullseye area the size of the mouth of the bowl. Only the first two shots were not aimed, so After falling outside the bullseye and adjusting later, the landing point of the projectile is much more accurate.

"When the test is fired, how far is the target from the mouth?" Yu Xiaotian turned his head and asked Zhang blacksmith.

Zhang Blacksmith quickly replied, "If you go back to the big master, the small one just began to test shoot, and the target did not dare to set it too far away and was placed 30 steps away!"

Yu Xiaotian observed the wooden target. This wooden target is a thick wooden board temporarily found by Zhang Blacksmith, with a thickness of about an inch. Several shots of the test shot directly penetrated the wooden target, indicating that the shooting power of this tube is relatively good. At least for unprotected targets, 30 steps away are basic. It can ensure very sufficient kinetic energy to ensure the lethality of living targets.

So Yu Xiaotian nodded and said, "Yes, but 30 steps are a little closer. Then try to put the target at a distance of 50 and 70 steps to try the accuracy and power!"

So in the afternoon, the shooting range was busy again, and from time to time began to hear the sound of sound again. According to Yu Xiaotian's request, the wooden target was placed 50 and 70 steps away, and the tube was still fixed on a wooden platform to aim and launch.

The result of the test is that at a distance of 50 steps, the accuracy and power of this pipe can be guaranteed. The landing point of the ring is only expanded, but it is still within an acceptable range. The landing point is concentrated within the size of the washbasin. Although the one-inch thick board has not been completely destroyed, most of the scales are still effective. The breakdown of the thick wooden board, which means that within 50 steps, the projectile shot by this barrel can still cause fatal damage to living targets.

But after 70 steps, the launch and accuracy of the bullet tube began to be greatly reduced. On the large target on the desktop target used as the target, the drop point of the bullet actually began to miss the target, and the power of the projectile also decreased sharply. The projectile was also concentrated in the lower part of the target, and it could no longer be effectively penetrated. Transparent board.

Therefore, the effective range of such a bullet is about 50 steps. After more than 50 steps, the kinetic energy consumption of the bullet begins to be serious, making the power and accuracy of the shot can no longer be guaranteed. The target basically depends on God to take care of it, and if the target has armor protection, it cannot be guaranteed. It is effective to kill the target.

Such an effective range is not even as good as the bird's bullet. The bird's bullet is still claimed to be 70 steps away, but the bullet fired by the bullet from the bullet tube can't guarantee the shooting accuracy and power 70 steps away. Yu Xiaotian is somewhat disappointed with this, but after thinking about it, he is relieved that he asked Zhang Blacksmith to build this The tube is different from the bird tube in this era.

The most important thing is that the caliber of the bismium tube has been increased by 15 mm, which is beyond the caliber of 8 mm to 12 mm commonly seen in this era, and the quality of the projectile has also greatly increased. However, in order to facilitate use, the caliber tube cannot be made too long, which also makes the caliber and length of the tube much lower. In addition, in order to ensure the safety of the tube, the amount of charge has not increased much, so it is also possible that the effective range is lower than that of birds with a smaller diameter.

Although the effective range and accuracy of this kind of gun is lower than that of bird gun, in fact, the power is much more powerful than the bird gun, especially within the effective range. The power of this kind of fire gun with increased caliber is much more powerful than that of ordinary bird gun. Although the penetration may not increase much, because of the bullet The quality of the pill has increased a lot, but the kinetic energy that can be transmitted to the target has increased a lot. Within 50 steps, as long as the person is hit, whether he wears armor or not, even if he does not pierce their bodies, the energy carried can basically ensure that the living target will be shot down, at least it will lose its combat effectiveness. The question.

(unlucky! Today, I started to have a fever for the third time! It seems that there is indeed something wrong with the body! It's just a slight cold, but it hasn't improved for a week. Last night, it burned to more than 38 degrees! I'm going to transport water today. I don't know if I can update another chapter this afternoon! If it really doesn't work, I will ask my brothers for a day off!)