The emperor of the Dawen Empire stayed in Zhoushan for three days before leaving, and stayed in one place for three days, which was something that the emperor had never done, and it was enough to prove how much the Dawen Empire attached importance to submarines.

During these three days, two submarine tests were carried out in a row, and the emperor of the empire also participated in the whole process, even if he ate ordinary meals with the crew on the navigation ship, he did not get off the ship again.

The second sea trial was also successful, and a lot of important data was obtained, in addition, another submarine is also stepping up the installation of the engine system, preparing for the two submarines to take turns to test, speed up the test progress, and strive to make the submarine finalized as soon as possible and join the naval combat sequence of the Dawen Empire.

Another submarine is being modified according to the plan given by Li Rujin, adding a skin to the hull to reduce the friction and vortex resistance of the submarine in the water. At the same time, the bridge was stripped and the vertical bridge was replaced with a streamlined bridge.

It's a big project that takes enough time to complete. The new type of propeller has also been designed, the new propeller is a five-bladed propeller, which increases the blade area and blade angle, which are all obtained through heavy mathematical calculations.

As for the results, the results will not be available until the actual test on board, but everyone is optimistic about the final test results.

Although the propeller design has been completed, it has not yet been produced, after all, the production difficulty of the five-blade propeller is several times that of the three-bladed propeller, even the Huhai Machinery Processing Factory does not dare to pack the ticket, saying that it can be 100% produced.

At this time, the director of the Huhai Machinery Factory told Li Rujin that the machine tool research and development team of the Imperial Capital Research Institute was looking for him all over the world.

Li Rujin participated in the research and development of military projects in Zhoushan, and the level of secrecy was very high, and it was really difficult to know Li Rujin's whereabouts and contact Li Rujin at this time.

Sure enough, although the method is a little stupid, but the effect is good, Li Rujin quickly contacted the head of the R&D team of the machine tool, and the person in charge told Li Rujin a shocking good news, the machine tool control program based on Chinese characters has been developed!

This news made Li Rujin overjoyed, and he couldn't wait to rush back to the imperial capital now and personally experiment with this set of procedures, but Li Rujin was really lacking in skills, and now the transformation of the submarine has reached a critical stage, and there is no room for error.

He wanted the R&D personnel of the machine tool to bring this set of programs to Zhoushan, but the R&D personnel told Li Rujin that this set of programs can only run on several designated machine tools in the research institute, and there is no compatibility, so the machine tools cannot be transported from the research institute in the imperial capital to Zhoushan.

Li Rujin put down the phone stupidly, the control program of the machine tool is extremely important to the Dawen Empire, although this set of newly developed programs may still be very simple, but after all, the most important step has been taken, from simple to complex, as long as the accumulation of technology and the precipitation of time, which step can be reached.

In order to return to the imperial capital as soon as possible and see this set of procedures with his own eyes, Li Rujin continued to speed up the progress of his work in Zhoushan. Even when the children in the family were one year old, Li Rujin did not rush back to the imperial capital, first, Zhoushan was indeed unable to leave, and second, Li Rujin was afraid that he would return to the imperial capital, so he looked at this set of procedures, and ignored Zhoushan, after all, he was just one person, it was impossible to divide it into two, Zhoushan was half, and the imperial capital was left half.

Li Rujin accelerated the progress to Zhoushan side brought a lot of pressure, under the huge pressure, Zhoushan side also broke out the terrifying work energy and research and development energy, five blade paddle after ten days of hard work, finally succeeded in manufacturing the first qualified product.

Li Rujin personally escorted this big guy back to Zhoushan, and Zhoushan's skin research and development has also made regrettable progress, under the guidance of Li Rujin, the first generation of shark skin was developed based on shark skin.

Sharks, the killers of the ocean, the presence of apex predators, are the most evolutionarily successful fish, and there is no one. Whales and dolphins evolved from mammals, and homeotherms are higher than cold-blooded animals in their own evolutionary process.

Whether it is physical size, mobility, or predation ability, sharks are the most evolutionary and successful in the ocean. From across the ocean, its skin structure is a marvel of natural evolution full of wonder and incomparability.

Due to the short time of the shark skin developed this time, it is only the most basic imitation, and the material used is also simple rubber, and the sad thing is that this set of shark skin is a disposable, and there is no guarantee that it can support until the end of the test.

The propeller replacement is over, but the shark skin still needs time, and it can only be produced while staining it on the submarine shell, which is indeed stained, and now it can only be used in this simple and crude method.

After another 10 days of refit, the "Experimental No. 1" submarine was finally completed and ready to go to sea for sea trials.

In order to facilitate the distinction, the shipyard called the first submarine launched into the sea "Experiment No. 1", and the other submarine that was reconstructed as "Experiment No. 2" was called "Retrofit No. 1", which was referred to as "Real One", "Real Two and Modified One" respectively.

Experiment 1 was reassembled, the dock began to fill with water, and when the dock surface and sea surface were balanced, the engine of Experiment 1 started, and the water splashed backwards, pushing the submarine towards the predetermined sea area.

This test is just a speed test, which is very simple, so the test time is also very short, only about an hour. With the commander's order, a diving alarm sounded on the submarine.

The submarine dive has been carried out many times, but each time the submarine dives the scene, the people present look excited and fascinated, and the huge water vapor column is raised high, does it also mean that the navy of the Dawen Empire has embarked on the road of rising?

An hour is not too long, and it is not too short, and those who are waiting will feel that this hour is very long, such as Li Rujin and a group of personnel waiting on the command ship.

However, the busy officers and men on the submarine felt that this hour was extremely short, and it was over after a few tests. Twenty minutes of economic sailing, twenty minutes of cruising, and finally an escape voyage ended the whole test.

When the submarine surfaced from under the water again, Li Rujin and a group of relevant personnel looked at the big guy who surfaced a little stupidly, and the shark skin on the submarine hull had fallen off from the hull due to the erosion of sea water and the pull of telling the voyage.

The shark skin on the entire submarine was scattered and looked miserable, like a beggar, Li Rujin asked the submarine to sail back to the dock and ripped off the scrapped shark skin on the hull. This image is really not good.

After the submarine returned to the dock, the gates closed, dozens of pumps in the dock began to work, and the waterline of the dock began to descend at a speed visible to the naked eye. The huge hull of the submarine began to gradually reveal itself.

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