Li Rujin spent a few days arranging Dong Weizhi and his entourage, and took them to have a good tour of the imperial capital, and Li Rujin also took this opportunity to visit the imperial capital. Li Rujin has been in the imperial capital for several years, but he has not seriously visited the imperial capital.

The work was handed over by the Great Elder to him, and at this time, Dong Weizhi knew the specific work of this new department and how much potential this department had. In addition, although Li Rujin is the chief official, he does not put his mind on this, in a sense, Dong Weizhi is the actual chief official of this department.

After Li Rujin arranged Dong Weizhi and his entourage, he told Dong Weizhi that he was going to Huhai to participate in the research and development work, Dong Weizhi's work has gradually unfolded, and there are great elders to escort him, no one dares to stumble on him in the open, but secretly, it is difficult to say.

Huhai is absolutely welcome to Li Rujin's arrival, in the eyes of Huhai, Li Rujin is a golden doll, a fortune boy! What kind of surprise will Li Rujin's arrival bring to Huhai this time.

As a result, the surprise came on the same day, and after Li Rujin and the R&D team met, they announced on the spot that they would not carry out the research and development of steam engines, and directly develop diesel engines.

The engine technology of the Dawen Empire has always been very backward, not to mention the diesel engine, the level of the steam engine is several grades behind the Europa Empire, and now the level of the Dawen Empire's steam engine can only make a single steam engine with a horsepower of about 2000, and it is huge in size, low in efficiency, and only suitable for civilian use.

Diesel engines are even worse, before Li Rujin crossed, the diesel engine technology of the Dawen Empire was basically zero, and more research and development forces were put on electric engines, resulting in an embarrassing situation where electric engines were dominant.

Now Li Rujin directly announced on the scene that he would develop a diesel engine, which will naturally cause a sensation on the scene, but more people are questioning Li Rujin, in the face of these doubts, Li Rujin did not refute, the fact will make these doubts disappear without a trace.

Under the leadership of Li Rujin, the Dawen Empire has successfully developed a high-horsepower tank engine, and the scientists of the Dawen Empire have invented the engine body with mortise and tenon structure more creatively.

But these technologies belong to military technology, the Dawen Empire did not announce to the outside world, these technologies are still in a state of secrecy, the outside world knows very little, everyone knows that the use of diesel engines is only on the diesel engine of the tractor.

But the tractor is a diesel engine and the diesel engine used in the ship is a completely different concept, it can be said that it is a world of difference, and now Li Rujin announced that he wants to develop a diesel engine for ships, how many people will believe it?

Li Rujin led the team to quickly carry out the research and development work, Dawen Empire already has experience in the research and development of diesel engines, and is familiar with this research and development work, but there are still many things to start from scratch.

The R&D target of this time, Li Rujin set a two-stroke low-speed diesel engine, and this choice was also a decision made by Li Rujin after careful consideration. The low-speed diesel engine is an excellent marine engine.

It has high thermal efficiency, good economy, easy starting, great adaptability to all kinds of ships, and low quality requirements for diesel, even if it is heavy oil, it can be used directly. (Heavy oil, one of the worst types of oil.) ）

In addition, because it is a two-stroke engine, the mechanical structure is relatively simple, the maintenance is convenient, and the low-speed diesel engine directly acts on the propeller drive shaft, reducing a large number of accessories, and the low-speed diesel engine also has its own reversal function, which can realize propeller reversal and reversing.

After careful analysis and comparison, Li Rujin decided to develop a two-stroke low-speed diesel engine.

Low-speed diesel engines are still a relatively unfamiliar field for the scientists of the Dawen Empire, and after Li Rujin's explanation, everyone has a preliminary understanding that Li Rujin does not plan to spend too much energy on this project, and in the research and development process, he cheated.

The design drawings were completed in less than five days, and Li Rujin took the drawings to Huhai Machinery Factory to open a production prototype. Half a month later, the first prototype of a 16-cylinder 1,500 hp two-stroke low-speed diesel engine was produced.

Ten days later, the test of the prototype was over, the data basically met the design requirements, and the maximum horsepower output reached 2100 horsepower.

The Shanghai side was stunned, how long has it been, and it has been less than a month since it was full! Shocked, he immediately contacted the shipyard and began to renovate the ship according to Li Rujin's request.

In fact, there are not many things to be transformed, mainly the transformation of the propeller drive shaft and the simple transformation of the engine room, so the transformation work took only one and a half days to finish, the engine was successfully put on board, after two days of installation and commissioning, it was decided to start sea trials tomorrow.

Early the next morning, at the fourth pier of Huhai Port, a ship with a displacement of 2,000 tons docked at the wharf, and the oil truck was refueling the ship.

In order for the test to go smoothly, Li Rujin temporarily blocked the test vessel, and those hopeful and curious ship owners could only wait anxiously on the dock, waiting for the test results.

At eight o'clock, Li Rujin and the R&D team appeared at the dock, and after a brief greeting, Li Rujin and the R&D team boarded the ship to do the final inspection of the engine, and at half past eight, the captain, the driver and several sailors went aboard.

The sailor untied the cable, the hull shook gently with the waves, and the hydrological conditions today are very good, with a wind force of 3-4 on the sea surface, and slight waves, which is conducive to navigation.

After everything was prepared, Li Rujin instructed the staff to start the engine, the engine started smoothly, and the propellers in the water rotated briskly, setting off white waves on the water surface.

With the increase of the throttle, the hull moved gently, under the action of the tail rudder, the bow of the ship left the shore of the dock first, the horsepower continued to increase, the water splashed boiling, the bow tore open the water, and slowly approached the channel.

Five minutes later, the test ship arrived at the main channel, which had been cleared and only the 2,000-ton boat was sailing in the wide channel. The test ship sounded its whistle, and the long whistle echoed across the empty sea.

Li Rujin stayed on the deck at the door of the engine room, and the staff on the side were constantly recording the data from the engine room. "Power 30%, speed 4 knots, everything works!" "Power 40%, speed 6 knots, everything works!"

There are many factors that affect the speed of the ship, the size of the engine horsepower is the main factor, in addition to the number of blades of the propeller, the structure of the hull, and even the water temperature and the direction of the current are all factors that affect the speed of the ship.