The external equipment of the engine has arrived at the blank room, the connection work has been completed, the fuel tank has long been filled with diesel, all the work is ready, and the engine is waiting for the test run.

The staff still took the tools to do the final inspection of the engine, although such inspections have been done countless times, but at the last moment, they were still not at ease, and did a detailed inspection of the engine.

It's none of your business, hang high. Once you shut yourself up, you are nervous. Li Rujin looked at the cautious staff with some amusement and sighed. Let them go, even if they are at ease.

At the end of the inspection, the staff made a gesture to Li Rujin that could be started, and Li Rujin walked to a simple console and pressed the engine start button. Driven by electricity, the flywheel turns, from slow to fast.

The rotation of the flywheel drives the piston, the piston reciprocates in the cylinder, inhales, does the work, "drag, drag, drag" The engine runs on its own, and a puff of black smoke comes out of the exhaust port, filling the room and causing a cough.

But none of the people in the room came out, they wanted to witness this moment in history. Li Rujin let go of the hand that pressed the button, and at this time the engine was already able to run on its own. The engine started successfully.

At this time, the onlookers applauded excitedly and congratulated them on their success, while the staff had already shed tears of excitement, and the hard work and dedication of nearly a month were finally rewarded at this moment.

The excited staff did not forget their responsibilities, and around the side of the engine while observing the operation of the engine, while recording various data, these data will be the basis for the optimization and transformation of the engine again.

Li Rujin let the engine run for a few minutes, completed the warm-up work, and then motioned to the bystanders to give way to the side, he was about to start gradually increasing the horsepower, Li Rujin slowly pushed the throttle, and the speed of the engine gradually increased.

The speed increased, but the engine still ran smoothly, in the design Li Rujin had already thought that this engine was to be installed on the submarine, there can be no violent vibration, so Li Rujin increased the weight of the engine itself.

Moreover, the mortise and tenon structure can well combine the various parts of the engine organically and tightly, so the mechanical vibration is much smaller. Li Rujin continued to push the throttle, and by this time the maximum speed of the engine had been reached.

Originally, Li Rujin wanted to design a low-speed diesel engine, but considering that it was mainly used to charge the battery, Li Rujin still decided to build a medium-speed diesel engine. (Medium-speed diesel engine speed 500---1000)

Moreover, the medium-speed diesel engine can directly drive the propeller drive shaft through a simple deceleration device to provide power for the submarine. If necessary, you can recharge the battery and sail at the same time.

The whole test machine lasted for nearly two hours, and the mortise and tenon structure engine was really excellent, whether it was running at low speed or high speed, the engine ran smoothly during the whole process, and there was no mechanical failure.

The successful test machine, after Li Rujin turned off the engine, won full applause, both the bystanders and the staff of the R&D team gave Li Rujin a thumbs up, at this moment, Li Rujin won the respect of everyone.

In the military research center, people with ability will always be respected, not to mention that Li Rujin led the R&D team to design such an excellent engine, which made up for the gap in the military diesel engine of the Dawen Empire.

In the evening of the same day, a grand celebration ceremony was held in the R&D center, and the scientific and technological personnel of the military did not get rid of the arrogance of the soldiers, and came over with bowls of wine to Li Rujin. No matter how big Li Rujin is, he can't resist it!

Li Rujin was drunk, and he didn't know how to go back to the dormitory, so he drank a broken piece. The next day, Li Rujin basically didn't leave the dormitory, and lay on the bed for a day, he had already entered a semi-disabled state, and he almost had to be fed for dinner.

It wasn't until the third day that Li Rujin recovered from his semi-disabled state, and the wine was too fierce.

With Li Rujin's recovery, the R&D team also entered the working state, and began to perform minor surgery on the engine with reference to the data. The superior performance of the whole engine has greatly increased the confidence of the entire R&D team, and they are full of great confidence in this engine.

The staff made several engines and began to carry out various tests on the engine, such as fatigue test, comprehensive fuel consumption test, driving the generator to charge the battery, and the data was continuously fed back to Li Rujin's hands.

Li Rujin instructed the relevant personnel to start the research and development of the motor, this time, Li Rujin got Zhou Yan's great help, and within a few days, the design and manufacture of the motor supporting the engine was completed, forming a complete set of equipment.

With the completion of the research and development of the whole set of equipment, the research and development of the engine for the submarine has come to an end, but there are still more difficult tasks waiting for Li Rujin, and now he has begun to prepare for the problem of the engine on the boat.

It has been more than a month since Li Rujin left the imperial capital, and he began to feel homesick, missing his mother, missing his wife, and even more missing the two fleshy sons.

Thoughts will spread, and in less than a day, thoughts occupy Li Rujin's brain, and everything seems so careless. Li Rujin also felt strange, since the two little ones were born, he seemed to have become more homesick.

When the longing changes from one to two, and then from two to three, the longing will become heavy, restraining Li Rujin's footsteps. Li Rujin applied for a family visit report, and now he is a military researcher, and the procedures that should be in place are the same.

The report on the family visit was quickly approved, and the institute was still very tolerant of Li Rujin, and with a stroke of the pen, the ten-day family visit leave was approved. Li Rujin simply packed his luggage and couldn't wait to leave Zhoushan. Now his mind is full of sons, sons!

Li Rujin's status in the military is still very noble, and he has already hung the rank of major general, which is not a fictitious title for civilian officers, but a real rank of major general with the ability to mobilize troops.

After several successive turnarounds, Li Rujin returned to the imperial capital smoothly, and this time when he came back, Li Rujin did not tell his family, he planned to surprise his family.

Sure enough, Li Mansion made a positive response to Li Rujin's sudden return, from the moment Li Rujin stepped into the house, Li Mansion was boiling, and for a time it was a time of chaos, chickens and dogs jumping, and Li Rujin's mother was even more on Li Rujin's ears before Li Rujin reacted.

It didn't take long for my sister and brother-in-law to hear the news, and the family had a reunion dinner with Meimei. At the dinner table, my sister's adverse reaction made my mother nervous, more of an expectation, they are all people who have come over, and my sister has a vomiting reaction at this time, which will definitely make people think more.

Under my mother's repeated questioning, my sister finally told everyone that she was pregnant with a baby! Suddenly, my sister became the focus of everyone's attention, as for Li Rujin, let's go and stay there!