The situation in Luzon is indeed a bit of a headache. As an island surrounded by sea, it is impossible to win a complete victory in the Luzon battle against hegemony without a powerful navy. Zhang Xianzhong obviously saw this. Wang Chengen believed that it was necessary to lend Shi Lang to Zhang Xianzhong, and Zhang Xianzhong could not be let go! As for Shi Lang who voted for Zhang Xianzhong, he might reversely fight against the Ming Dynasty, but Wang Chengen was not worried about this at all.

"Your Majesty, don't worry about Shi Lang! So what if he becomes an overseas corps? I mean, our submarine is almost done."

Wang Chengen's words brought another surprise to Chongzhen, and Chongzhen was surprised:

"Is that so? I said Wang Chengen, you are like a big magician. You can take out a treasure in a while and always bring us surprises. Tell me, how is this submarine like?"

Wang Chengen pointed at the princess and said:

"In fact, the development of the submarine also has the credit of the princess. Please tell me, princess."

Chongzhen did not expect that the princess would also participate in the cutting-edge technology of the Ming Dynasty. He thought to himself that among the three time travelers, it seemed that he was the only one of them was a useless person.

The princess took the speech and said:

"I dare not take credit. At most, I brought some students to help with some auxiliary work. The most important thing is Xiang Wenjun who was responsible for this project. At that time, I just wanted to find a place for some top students from the Military Engineering Academy to intern and start working as soon as possible. This submarine project involves buoyancy, fluid, propulsion, transmission, and pressure vessels. It is probably difficult to find such a representative carrier anymore. So the submarine team has become a key internship project of our Military Engineering Academy. Since we have never built submarines before, we just started learning and started working, bit by bit, as we looked at the hat, and we looked like we were like a small wooden submarine at the beginning. At the beginning, we built a small submarine, which is equivalent to a toy submarine. The submarine we have built now looks a bit like a real submarine."

When Wang Chengen heard the princess’s words, he thought that there was a princess who belittled the new submarine so randomly! So he had to come up with professional insights and explain them to the emperor, and of course he also said it to the princess. After all, if students and craftsmen are present, it is impossible to talk to the princess about the following words:

"You can't say it like the princess. The first toy submarine the princess was basically copied from the submarine ship built by the Dutchman Drell in 1620. It was said to be a submarine ship, but it was actually more like a wooden cabinet, which contained a sheepskin bag used as a compressed water tank. When diving, it poured water into the sheepskin bag, and when floating up, it squeezed out the water in the sheepskin bag. Unlike Drell's submarine, the submarine ship built by Drell was equipped with multiple wood pulp extending from the ship. When people rowed the wood pulp, they would move under the water. Of course, our wooden pocket submarine did not need to adopt such a backward rowing design. We used a crankshaft connecting rod mechanism to drive the propeller. We just copied the sheepskin bag design."

Chongzhen was also a military enthusiast, asked:

"Oh, it's also a submarine. Hello, there's no horizontal elevator, right?

Wang Chengen's face turned red and he said:

"Actually, I have limited knowledge about submarines in the future. After the first submarine was made, I tried the water and found that the balance performance in the water was too bad. So the princess later laughed at me and said that I did this on purpose and did not set up a horizontal elevator in order to make it a reverse teaching material - you see, without a horizontal elevator, you will hit somersaults in the water. Students, it turns out that it is not possible to have a horizontal elevator."

As soon as these words were said, the three people explained and laughed. Wang Chengen continued:

"As a result, the first submersible was directly transformed into the teaching model of the Military Engineering Academy. Then I thought of the lift balance rudder. Later, I took more planes and saw the swing of the horizontal elevator when taking off and descending. I turned a blind eye to it. I finally understood the truth when I recalled. So, when I was building the second submarine, I designed the horizontal elevator. This second one refers to part of the design of the American submarine in 1863. The Henry was the first submarine in history to be used for actual combat. The Southern Army made the basis of

I used this primitive iron-shelled submarine to blow up the Northern Army's "Houston" cruiser. This "Henry" is 40 feet long and is driven by human power. It is driven by eight people shaking the crankshaft linkage mechanism, and the speed is 4 nautical miles per hour. If you want to ask what kind of crankshaft linkage structure it is, the introduction I saw in later generations is also vague. However, it must be similar to the lever crankshaft linkage system I designed. This system has been carried forward to the Wenjun and is now very mature. I am afraid it is more cost-effective than the "Henry" system."

Chongzhen thought about the system that shined in the Battle of the Taiwan Strait, and nodded repeatedly and said:

"Yes, the system Xiang Wenjun has built is simple, but it does work."

Wang Chengen continued to introduce his proud works:

"Although this second submarine is still made of wooden, it adopts a pressurized water tank design and compressed air is installed in a copper tank. This is exactly the same as the lifting principle of later submarines and is much simpler to operate. With the use of horizontal elevators, the underwater control performance has been greatly improved. As the princess said, this submarine can be called a real submarine."

Of course Chongzhen would not be satisfied with this and sighed:

"With such a submarine, if Shi Lang goes crazy, ah, no, I'm talking about the madman Zhang Xianzhong who really wants to take Luzon and instruct Shi Lang to rob the Ming ships. As long as we send this kind of submarine to fight, the rocket launcher and rocket are enough for him to drink a pot. It's simple to deal with Shi Lang, but to deal with the Japanese, wooden submarines are almost of grade! Besides, there must be a submarine, and there must be a torpedo. You won't tell me that even the torpedo was made!"

Wang Chengen said embarrassedly:

"This, this torpedo, this is really not! However, the torpedo will be available soon. Of course, this torpedo is also the first torpedo created by Whitehead in 1866, and is a copycat version. This copycat version uses compressed air as power, drives single propeller propulsion, and the horizontal rudder plate controls the depth of the torpedo's boat. Whitehead's torpedo's boat speed is 11 km/h and has a range of 180-640 meters. Our copycat version has a compressed air engine, and it may not be tested after half a month."

In theory, the principle of this piston engine driven by compressed air is simple, and it can even be designed as a blade. Speaking of which, there are too many things to do, so how can it be covered in everything and can only be selected.

Chongzhen was very excited when he heard this, but said:

"I also know that technology advancement requires time, manpower and material resources, and cannot be achieved overnight. But there is no way, after the Japanese, the pressure was extremely high after traveling through time. Although they signed a non-aggression agreement with these Japanese, they both knew that this was just a piece of paper, and they were all trying to get time. So time is endless!"

The princess looked calm and said with a smile:

"You can still make money by adding additional investment in technology, of course, money will never be enough. After the situation in Beijing eased, Pingliao's government bonds rebounded step by step, and it is expected that profits of 200 million taels of silver will not be a problem. If you sell arms to Zhang Xianzhong, you will also have more than one million taels of silver. If you invest another 4 million silver coins in technology, I don't know how many results can be produced."

When Wang Chengen heard this, he couldn't help but feel excited and said solemnly:

"As long as I have money, it's easy to do! With money, I can build a project team. It's not difficult for the project team. Find a few scholars and some craftsmen, make an outline, and arrange them, and then you can do it. For example, alloy steel is nothing more than doing more experiments, different temperatures, different catalysts, sulfur and phosphorus removal agents, and different combinations of trace metals, etc., plus I'm in, the general direction will not be wrong, and I can avoid countless detours, and of course it will be very fast. Just like a submarine project, draw pictures and make models, it will take less than ten days, and then build physical submarines. Most of the detours taken in history do not need to be taken again, so it can be so fast! I can say in charge that the more money, the more results, the faster the results. However, no matter what, I have to send more scholars and craftsmen to me, and I don't choose them. I think those children of the royal family are not good, just transfer them to me."

, Chongzhen heard Wang Chengen's words and said with a smile:

"Then what you mean is that Shi Lang just borrows and sells weapons. Anyway, our new weapons will emerge one after another. Apart from the Japanese, we are not afraid of anyone, and we are not afraid of any overseas corps. Right!"

The princess giggled:

"That's right, I'm still worried that Zhang Xianzhong will not be able to start the situation in Luzon. Originally, we don't have to worry about Zhang Xianzhong, a bandit, and we can just let him die. But we still have to worry about him, the bandit leader. You guys say, is this just a strange thing!"

Chongzhen was full of confidence in Zhang Xianzhong and then said something:

"The rumor is that the Japanese are going to withdraw from Luzon. In my opinion, this may be true. If I were me, I wouldn't be trapped in the mud pit of Luzon. Obviously, the current situation is likely to be a situation like the Vietnam War and Afghanistan. The Japanese might as well withdraw their troops and advance eastward with all their might, so that they will not waste resources. However, the Japanese's approach has never been based on common sense. Who knows what will happen!"

－－－－－－－

On this day, Zhang Xianzhong finally received a reply from the Ming Dynasty, agreeing to borrow someone, including Shi Lang and Shi Lang's original subordinates, and even some ships, of course, nominally, he still defected to Zhang Xianzhong in the name of defection.

This is really good news!

However, another bad news came immediately, with signs that the Japanese army was preparing to withdraw its troops, and after the withdrawal, Manila would be handed over to the Spanish.

Zhang Xianzhong immediately summoned everyone to gather together in the royal palace to discuss the major plan.

There are many different opinions about the Japanese withdrawal and Spain's defense. The news is true and false, and it is difficult to tell the authenticity. Yang Heng and Wei Deng are even more worried that the Japanese are setting traps.

However, new information shows that the Japanese were indeed withdrawing troops in batches, and teams of troops boarded the ship and left, and fewer Japanese troops in Manila were rushing to Luzon from both water and land, saying that it was possible to be in control. After Qin Zhiyong's confirmation, this information has been increasingly revealed that the Japanese and Spanish had reached a tacit understanding, and withdrawing troops and transferring city defenses is by no means groundless.

Zhang Xianzhong was patient and listened quietly to everyone's statements and suggestions. He slapped the table and said:

"I already know your advice. Since I, Zhang Xianzhong, came to Luzon, I am not afraid of Japanese pirates and Spain. Even if they join forces, we will take action when we should. I am afraid of him as a ball! If the Japanese dare to withdraw, my army will dare to attack. I am determined and immediately send troops to Manila and must capture this city! Regardless of whether it is a trap or not, I dare to get in. If our army blindly avoids war, then don't want to occupy Luzon. Hum! Of course, how to attack Manila, Dingguo and some of us might as well come up with a combat plan. New firearms combat, Staff Yang and Staff of the Guard are experts. Determined to make a good combat plan and take Manila in one fell swoop, it depends on you!"
Chapter completed!