The Invincible Sixth Prince

A few days after returning to Shuofang, Yun Zheng received another good news.

Takeshi Sanada has arrived in Niitsu!

Moreover, Takeshi Sanada even played a trick on them by tying himself up and asking for forgiveness!

Upon receiving the news from Xinjin, Yun Zheng immediately ordered someone to send Takeshi Sanada to Dingbei, and he also rushed to Dingbei with Zhang Xu.

They set out at noon and didn't arrive in Dingbei until midnight.

The next morning, Yun Zheng took Zhang Xu to the firearms workshop.

"Have any new cannons been built recently?"

Arriving at the firearms workshop, Yun Zheng hurriedly asked Yue Sheng.

"Your Highness and Lord Zhang have arrived at the perfect time."

Yue Sheng replied with a smile: "We are preparing to cast a four-inch cannon..."

"Are you sure?"

Zhang Xu asked immediately.

"This one……"

Yue Sheng smiled embarrassedly, "We are just trying, we are not sure..."

Isn’t this all tested step by step?

After Yun Zheng and Ye Zi left last time, we started preparing to cast a four-inch cannon.

We have been doing preparatory work before this.

They specifically looked at today's auspicious day to start casting cannons, and also wanted to ask God for some luck.

If they were sure, why would they bother with all this nonsense?

"Then follow your own ideas!"

Yun Zheng ordered: "Whether it can be done or not, it's okay! Don't feel stressed!"

If the four-inch gun doesn't work, then get a three-inch gun and show it to Takeshi Sanada!

If all else fails, find a place to bury the explosive pack in advance, calculate the time to ignite it, and disguise it as a cannonball explosion.

Anyway, Takeshi Sanada doesn't understand these.

All I can do is scare Takeshi Sanada and make him work for me wholeheartedly!

They are going to invade Yu Country to fight, and it would definitely be better to have someone who understands the situation in Yu Country to work for them.

"Yes!"

Yue Sheng took the order and immediately began to order his men to prepare to cast the cannon.

It was also the first time for Yun Zheng to watch these craftsmen casting real cannons on site. He was very interested and followed Zhang Xu to watch the cannon casting process.

This was also the first attempt by Yue Sheng and his team, so they also cast copper cannons.

This is also their usual practice.

If we can't even cast a copper cannon, let alone an iron cannon.

After these days of preparation, they have already prepared several molds and only need to melt the copper and then pour it.

They prepared three types of molds.

One is a split mold, which is equivalent to splitting the copper cannon into two equal parts from the middle. This makes it convenient to polish the barrel. After the barrel is polished, it is tightened little by little with an iron hoop.

This is also the simplest method.

But at the same time, the cannon cast in this way is basically scrap metal.

The purpose of casting this kind of cannon is mainly to keep samples and facilitate checking the casting effect.

The other two methods are the mud mold casting method they used first, and the lost wax method that Yun Zheng mentioned was developed by them on their own.

All three cannons must be cast today, and then we will determine which method is more appropriate based on the finished products. At the same time, we will also summarize the experience and lessons learned and prepare for the next casting.

By the afternoon, the casting of the three guns was completed.

But it still needs to cool down slowly before you can see the final product.

Yun Zheng and Zhang Xu were too lazy to go to Dingbei, so they stayed at the firearms workshop for one night.

At the same time, I also took the time to make a few flower pops.

By the next day, all three guns had completed cooling.

The appearance of the finished product is actually quite acceptable, except that the barrel and the bore are not smooth.

The bronze cannon cast with a mud mold not only had relatively large potholes inside the barrel, but also had obvious inconsistencies in the gun body, which was probably caused by some deformation of the mud mold during the casting process.

This type of cannon does not even need to be polished and tested, and the casting can be directly declared a failure.

In addition, the polishing and subsequent processing of the two cannons will take time, and Yun Zheng will definitely not be able to wait until they finish polishing the finished products.

"How do you usually polish the barrel of your gun?"

At this time, Zhang Xu asked about Yue Sheng again.

“It’s all polished by people!”

Yue Sheng replied: "It's just like polishing the inner barrel of a musket!"

Zhang Xu thought for a moment and asked, "Can we make a rack to fix the cannon on? Then make a windmill to drive the cannon on the rack to rotate, and then add iron sand into the barrel to block the opening..."

"This……"

Yue Sheng thought about Zhang Xu's description in his mind, and then suddenly slapped his head: "Master Zhang is really smart! Why didn't we think of polishing it this way?"

"Do you think it's feasible?"

Zhang Xu asked with a smile.

“It will definitely work!”

Yue Sheng said confidently: "However, we will definitely need to try a few more times to get the exact result."

This kind of polishing can save a lot of manpower.

Moreover, the cannon is made to rotate by being polished with iron sand. After being polished for ten days or half a month, it might be much smoother and more evenly polished than if it were polished slowly by a person.

However, ideas are ideas and reality is reality.

Zhang Xu's method is definitely feasible, but it should be improved in specific use.

But Zhang Xu undoubtedly provided them with a good idea.

"I knew that bringing you to the firearms workshop would not be in vain!"

Yun Zheng looked at Zhang Xu with a smile on his face, "Well, you discuss with them here how to realize your idea. I will go back to Dingbei first. When I leave, I will send someone to call you."

The purpose of bringing Zhang Xu here was to let Zhang Xu provide some ideas for improvements to the firearms workshop.

At present, it seems that Zhang Xu is indeed smart.

The method that he had not thought of was thought of by Zhang Xu.

It is true that every profession has its specialties!

"it is good!"

Zhang Xu agreed readily.

Afterwards, they simply took a shrapnel bomb for testing.

The effect is actually quite good, but the range is indeed very limited.

This has nothing to do with the shells, it’s mainly a problem with the cannon.

In the end, Yun Zheng and Zhang Xu left with a three-inch cannon.

After thinking about it overnight, Yun Zheng decided not to disguise the explosive pack as a cannonball.

Just this cannon, as long as it doesn't explode when fired, is enough to intimidate that country bumpkin, Takeshi Sanada.

There's no need for any of that fancy stuff!

The next morning, Takeshi Sanada was taken to Dingbei.

Yun Zheng met with Takeshi Sanada directly in the military camp in Dingbei.

Also coming with Takeshi Sanada was Oshima, who had been let go by Yun Zheng before.

Walking into the military camp, seeing the armor on the soldiers and looking at the strong war horses, Takeshi Sanada and Oshima couldn't help but feel secretly envious.

If they had these armors and weapons, and recruited a group of people, they would be able to return to the Yu Kingdom for revenge!

Finally, they met Yun Zheng on the parade ground.

At this moment, Yun Zheng was preparing to test the artillery.

Although Yu Kingdom did not have gunpowder, Yun Zheng felt that it was still necessary to keep this cannon secret.

He didn't want to be seen by Takeshi Sanada and the others even if it was just a basic shape.

Therefore, he ordered people to add a wooden box to the cannon, so that Takeshi Sanada and others could only see the muzzle and could not see the specific shape of the cannon at all.

"I pay my respects to His Royal Highness Prince Jingbei!"

Seeing Yun Zheng, Sanada Takeshi and Oshima quickly knelt down to salute...