The plan of the day lies in the morning, Li Rujin opened his eyes in a loud military trumpet, and after a moment of confusion, he remembered that this is the Zhoushan Shipyard, which is the military enterprise of the Dawen Empire, he quickly got up, washed and left the room, and walked to the restaurant in the barracks.

On the way, Li Rujin met Zhou Yan, the guy who debated with him yesterday, the main creator of the mini-submarine, Zhou Yan, who is five big and three thick, and is taller than Li Rujin.

Li Rujin is already quite tall, one meter seven or eight, but this Zhou Yan is half a head taller than Li Rujin, and he is burly, more like a brave soldier, he can't be disgraced, but he is indeed a research and development personnel of the Dawen Empire's military.

Moreover, he is thoughtful, flexible, has a solid foundation, and has a wide range of knowledge, and in yesterday's debate, if Li Rujin had not relied on the aura of the protagonist of the traverser, it would have been difficult to predict whether he would win or lose.

The two ate together in the restaurant, Li Rujin understood what a big guy has a big meal at this time, two or two steamed buns, this guy ate eleven at a meal, two bites of one, Li Rujin was dumbfounded, rice porridge, this guy drank two bowls, the number is not much, but he can't stand the big bowl, like a small wash basin.

After eating, the guy touched his belly and muttered, "It's almost, seven or eight points full." ”

When Li Rujin heard this, he almost knocked his head into the rice bowl in front of him, and said in his heart: This guy is a rice bucket that has been mixed into the army.

After the meal, the two walked to the R&D center with a lively conversation and laughter, but when they arrived at the door of the R&D center, they saw a group of people at the door of the R&D center, neatly arranged, just like students doing morning exercises.

Li Rujin looked at Zhou Yan strangely, Zhou Yan explained, these are the staff of the R&D center, the body is the capital of the revolution, the R&D personnel have few activities, and sometimes in order to engage in research, it is common to forget to sleep and eat, so the leaders of the R&D center decided to do activities at the entrance of the center every morning.

Li Rujin is absolutely in favor of this decision, this should be learned back, and it will be promoted in the research institute of the imperial capital when the time comes. Li Rujin consciously followed Zhou Yan to the back of the team, lined up behind Zhou Yan, and followed the leader's board to do activities.

Li Rujin looked at Zhou Yan in front of him, such a big person started to move, how uncoordinated he looked, as if he was a bear doing exercises, the picture was so beautiful, Li Rujin really couldn't bear to look at it.

In the office of the R&D center, Li Rujin and the R&D team of the emperor are designing drawings for the submarine's engine, and this time, Li Rujin plans to use the tenon structure to design the submarine's engine, and strive to use the silencing technology.

Because it is a submarine engine, the requirements for the engine are higher, not only require high horsepower, low noise, small size, but also require durability and simple maintenance, after all, it is sailing in the vast sea, and there is no way to repair the engine with big actions.

Therefore, the research and development of submarine engines is more difficult, before Li Rujin's arrival, the research and development team had drawn a number of drawings, but they were not passed, and the mortise and tenon structure is not very proficient, the research and development progress has been temporarily frustrated.

The mortise and tenon structure is also a strange field for Li Rujin, the traditional craftsmanship of the republic in the previous life has been lost a lot, although there are still heirs of this mortise and tenon craft, but it is only limited to a certain industry or a certain place, Li Rujin has basically not been contacted, let alone understood.

But Li Rujin has a good mind, and he has a better memory, and the mortise and tenon engine used in the tank has been firmly remembered in his mind, and he can continue to deform, assemble, deform, and reassemble the mortise engine parts of the tank in his mind, hoping to deduce a suitable engine.

At this time, Li Rujin's brain is like the most sophisticated computer, and it is also large, and it has the ability to think and self-correct that computing does not have, and constantly improves the design plan.

But it is not so easy to deduce a suitable engine, due to the lack of understanding of the tenon structure, let Li Rujin want to break his head, and did not design a suitable engine, but there are many ideas of inspiration, Li Rujin wrote them all down, as supplementary materials to everyone for reference.

Thinking for a long time is a huge burden on the brain, Li Rujin didn't dare to think too much, the lesson of excessive use of the brain some time ago is still in his heart, that uncomfortable taste, Li Rujin didn't have the courage to try again.

Time passed day by day, the whole R&D team was busy, Li Rujin's inspiration gave everyone a lot of inspiration, and Li Rujin also had a deeper understanding and understanding of the tenon structure in the continuous deduction.

The mortise and tenon structure is worthy of the immortal invention of the Han people, the mortise and tenon structure is not easy to deform, does not fall apart, and the joint is tightly stuck, which can give full play to the properties and characteristics of the material to the greatest extent. It is much stronger than any bolt structure and can minimize the volume.

The prototype of the engine is also constantly improving, and when Li Rujin arrived in Zhoushan for nearly half a month, the first submarine with mortise and tenon structure engine model was successfully designed and developed.

With the solid model, the progress of research and development was accelerated, and after continuous optimization and transformation, the R&D team decided to make the first prototype. Zhoushan Shipyard has a ready-made machining center, and the machining accuracy fully meets the requirements of the machining accuracy of parts.

Li Rujin and the R&D team moved to the battlefield, and out of the need for secrecy, many parts needed to be manufactured by the R&D team themselves. In the machining center, Li Rujin looked at the machine tools, and felt full of emotion in his heart, he had not operated the machine tools himself for too long, and there was an inexplicable desire in his heart.

The ideal is plump, the reality is skinny, because the machine tool has not been operated for too long, Li Rujin's hand feels a lot rusty, and the operation of the machine tool is a little clumsy.

But after several operations, after producing a bunch of scrap products. Li Rujin's hands and feet became numb, and the sensitivity of the science and engineering students to the machinery that was almost melted in their bones was brought into play, skillfully operating the machine tool, watching one after another qualified parts produced from his hands, Li Rujin's heart had an inexplicable satisfaction.

The whole set of parts, in order to prevent accidents, a total of three sets of out, with the completion of the parts, the first submarine mortise and tenon structure engine prototype is about to be born. The entire R&D team is also eagerly awaiting the birth of this engine.

In a remote corner of the R&D center, there are a few simple rough houses, few people come here, but today, it is very lively, the entire R&D team and the relevant personnel of the research center gather together, so that these rough rooms are full of brilliance.

The engine had been assembled and sat quietly in a corner of the room, the whole engine was structurally complete and square in appearance, more like a large rectangular piece of iron than an engine.

Today is the big day of prototype testing.