Hugo van Groningen sat on a small stool in the arsenal casting workshop, silently organizing tools. François, a casting gunman from Lausanne, once made cannons for Bavaria, and was quite experienced. He was the well-deserved leader of their group, and this was also accepted by the "Tartans".

François was rated as a third-level worker by the factory manager of the "Tattans" with a monthly salary of 30 riyals; while he, a young man from Groningen, is a first-level worker with a monthly salary of only 5 riyals. After deducting the monthly fee, he only earns 4 riyals.

In addition to them, there are more than 20 people in the cannon casting workshop. However, they are all rookies with no experience. Except for a few "Tartans" who are still smart, the other handymen are clumsy and they can only cause trouble at any time.

To be honest, Hugo has a good impression of those "Tartans". At least they are very polite, and they seem to be uninformed, and often ask some incredible questions and ideas.

The casting cannon workshop once successfully cast four long-barrel cannon guns. The performance is pretty good and the weight is much lighter than the cast iron cannon. Unfortunately, they not only cast these four cannons, but also cast eight cannons. Obviously, none of the other four cannons were qualified.

In fact, this yield rate is acceptable for a group of cannon artists, who are mostly novice, but the "Tattans" obviously don't think so. They were extremely disappointed with this result. One of the leaders surnamed Ma decisively stopped the supply of steel in the cannon casting workshop and threatened to stop the work of the cannon casting workshop without solving the problem of too low yield rate.

In this way, Hugo was idle for a while, of course, such days were not too long. Soon, the "Tatans" came back. During this period, they studied four unqualified cannons. Three of the four cannons were blown up or cracks during the loading test, and one was that the barrel had problems when it cooled, causing the barrel to bend.

This curved gun barrel gave the "Tatans". After discussion, they believed that this was because the inner and outer walls of the gun barrel were unevenly cooled, resulting in invisible cracks on the inner wall of the gun barrel.

To be fair, Hugo believes that this conclusion makes sense. When the gun barrel is cast with steel molds, when cooling, the outer wall area of ​​the gun barrel is larger than the inner wall, and the external air circulation is faster than that of the inside of the gun barrel, it naturally causes the outer wall to cool faster than the inner wall, causing cracks to appear on the inner wall of the gun barrel. If cracks appear on the inner wall of the gun barrel, the gun will naturally explode.

The larger the caliber, the more likely it is to have such problems, because the larger the caliber, the larger the area difference between the inner and outer walls of the barrel, the larger the cooling speed gap, the more likely it is to cause cracks in the barrel. Thinking of this, Hugo felt a sudden enlightenment. No wonder the larger the caliber, the lower the yield rate of the cannon, and some large-caliber artillery can't be successfully cast. It turns out that this is the reason for everything.

Today, four newcomers came to the cannon casting workshop. These are new cannon craftsmen collected by the "Tatans". Hugo knew that they were Swedes based on the rough Chinese he learned in the night language school.

Damn Swedish! Hugo muttered to himself.

The eight "Tatans" who often participate in the casting of cannons in the workshop came all. In addition to them, a "Tatan leader" who had been there several times before appeared. After a while of discussion, they decided to offer a reward of 500 riyals to everyone for a method to speed up cooling the inner wall of the gun barrel. They promised that once the method is proven to be effective and reliable, the bonus will be redeemed immediately and the professional title will be improved by one level.

This condition made Hugo feel a little moved, and he began to calm down and think about the method.

Wang Qinian was a little irritated. Why didn’t there be many people in the 568 people who know various industrial manufacturing? In the past, the protagonists who read novels online seemed to have turned into encyclopedias after traveling through time. They wished they knew everything and were proficient in everything. Building guns and cannons is nothing, but aircraft carrier missiles can be made for you. It’s really a matter of comparing goods to throw away goods, and people can die! The eight time travelers in the cannon casting workshop also followed these Europeans to cast several cannons. They discussed it for a long time last night, but they didn’t come up with any good ideas.

Wang Qinian was just irritated when he suddenly saw a tall and thin foreigner with red hair standing up in the workshop.

It was him! The gunman Hugo van Groningen from the Netherlands. Wang Qinian remembered it all at once. There was no way to remember it. This guy was one of the only two genuine gunmans who had traveled through time travelers before.

Did he have any solution? This thought passed through Wang Qinian's mind.

"Sir. I...I think I have a... way." Hugo said in Chinese stutteringly. When he found that he could not express his meaning accurately in Chinese, he immediately spoke English. His mother was English, so he also spoke fluent English, and he knew that many of these "Tartans" could speak English.

"Sir. I think we can use water or oil to cool the inner wall of the barrel." Hugo said. "It is well known that water cooling is far more efficient than air cooling. Since the inner wall of the barrel cools slowly than the outer wall, can we use some kind of medium with high cooling efficiency to speed up the process? For example, water or oil."

"Hmm?" Wang Qinian's eyes lit up suddenly: "This is a way."

"Pour water into the cannon barrel?" asked Wu Jun, the time traveler. He was the time traveler who was focused on cultivating by the Executive Committee.

"No, it's not like this. This will cause the barrel to crack." Hugo's thoughts become clearer. "We can make the inner mold when casting the gun into hollow. Simply put, it is to leave a cooling cavity in the inner mold. When the inner wall of the red hot barrel is in full contact with the inner mold, the heat transmitted heat heat heats the inner mold. At this time, we inject water into the cavity, and the water flows out from the other reserved port, taking away the heat. In this way, constantly injecting water out of the water can achieve circulating cooling. What's even better is that this process is still controllable. We can control the cooling process by controlling the flow of the cooling water. After all, if the inner wall is too heated, the barrel will still have problems."

"This method is good!" Wang Qinian slapped his thigh hard, stood up and said excitedly: "Xiao Wu, I think this method is reliable! Why don't we give it a try?"

"I think it's OK." Wu Jun nodded and said, "No need to delay, let's cast a cannon as soon as possible and try the effect. Moreover, we need to explore how much the flow rate of this cooling water is appropriate."

"Okay, I'll go find a vest." Wang Qinian said, "Look at when his cauldron will open. When it opens, hurry up and get some steel for us. Grandma, this kid is really stingy and has cut off our breasts for a whole month."

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Three days later, the test gun field was crowded with people.

Many people have heard of the new art of casting cannons and rushed over to see the effect. Not only Wang Qinian and Ma Vest came, but even Peng Zhicheng from the Army also came. After all, he was also the one who was obsessed with cannons.

The casting gun workshop launched a 24-pound cannon this time.

This is a 24-pound long-tube cannon with a diameter of 18. Since high-quality high-carbon steel was used during casting, the weight of the entire cannon and the cannon truck was only about 1.5 tons. After the casting of the cannon body, the inner wall was cooled by water cooling, which greatly increased efficiency.

In fact, the travelers not only cast this cannon, but also an 18-pound cannon failed to control the cooling speed of the inner wall, causing cracks to appear on the inner wall and could only be discarded.

The eight gun team members were all time travelers selected from the security team. They had conducted many live-fire training before and were quite proficient in their business.

The gunners first filled the 4-pound reducer package into the barrel. Because it was a test gun, they did not load the projectiles.

After everything was ready, Wang Qinian calmed down a little and signaled that he could fire the gun. The members of the gun team pulled the long lead wire outside the gun door to retreat to a safe distance, and then ignited the lead wire.

There was a loud "boom" sound, and the muzzle was filled with smoke. Wang Qinian looked around and felt relieved, at least not on the spot!

The gunners quickly surrounded him, cleared the barrel, and checked for cracks in the cannon body.

Everything is good! The cannon leader made a gesture to Wang Qinian.

The standard charge of the 24-pound gun is 6 pounds, which is just passing the first level. Next, the gunners will load the 6 pound standard package into the inner chamber to test the performance.

The members of the gun crew skillfully cleaned the barrel, loaded it into a standard medicine bag, then retreated to a distance, ignited the lead, and fired!

The 24-pound cannon roared again. Without waiting for Wang Qinian to signal, the members of the gun team rushed forward to check the cannon body in thick smoke.

No problem! The gunman made the same gesture as the first time.

There were already a small cheer on the audience, and Wang Qinian and Peng Zhicheng's faces were full of smiles.

"Put 8 pounds of medicine!" Wang Qinian waved his hand heroically, "Try the performance under strong loading."

The gunners left as they said and repeated the previous moves again, but this time the medicine bag was replaced with an 8-pound strong-loading medicine bag.

"Boom!" The 24-pound cannon that was fired was still standing on the spot as steady as Mount Tai.

The cannon leader ran over and carefully inspected it for ten minutes before shouting: "There are no cracks!"

"Yeah!" Wang Qinian and Peng Zhicheng were celebrating and smiling.

The test results perfectly prove that the internal mold water cooling method is successful and effective when casting the cannon. What the travelers need to do next is to cast the cannon more and verify whether the yield rate has really decreased to the desired result.

Hugo van Groningen stood behind Wang Qi Nian with a smile, and François and the four new Swedish cannon casters looked at him with envy.
Chapter completed!