The whole test process took nearly three hours, and after the test, Li Rujin opened the engine room for relevant personnel to visit freely. After the visit, Li Rujin led the staff on the ship and began to carry out some maintenance and technical modifications to the engine.

In the test just now, a lot of small problems were found, such as the friction between the engine and the transmission shaft is a little large, the engine is running at full speed, the vibration is more severe, and in the test process just now, two cylinders failed and stalled during operation.

Li Rujin led the staff to be busy in the engine room, but the crowd on the dock had already exploded, talking about each other, and there were more words of praise, as for questioning, Li Rujin's R&D team has already come up with the real thing, who dares to question it?

Of course, there are some people who can't eat grapes and say that grapes are sour, saying that this is a 1500 horsepower engine, but they need an engine with tens of thousands of horsepower, and they don't know when to develop an engine with tens of thousands of horsepower?

The tone is sour! Someone on the side recognized him, this guy, just spent a lot of money some time ago to buy two 12,000 horsepower steam engines from the English Empire to install on his own ship, these two engines almost exhausted his family's funds.

But for the sake of business, he gritted his teeth and bought it, and now Li Rujin has made a diesel engine, although it has just started, but the future development must be promising, can he feel good in his heart?

You must know that the service life of a ship's engine is more than ten years, which is basically the same as the life of the hull, and if there is no diesel engine, the shipowner may be proud for a long time, after all, it is extremely difficult to buy back an engine from England or the Europa Empire.

Not only is it expensive, but most importantly, you often can't buy anything if you have money. Now, Li Rujin has made a diesel engine, how many years can he be proud? Three years or five years, he never thought that he would only be proud for one year.

In less than a year, the R&D team successfully developed a 6,000 horsepower diesel engine. A 20,000-ton freighter can run more than 15 knots with two 6,000-horsepower diesel engines, and when fully loaded with cargo, it can also run up to 10 knots, far exceeding his steam engine.

Li Rujin did not stay in Huhai for too long, and left Huhai after setting R&D goals for the R&D team, and he had to rush to Zhoushan Island to participate in the research and development of submarine engines.

Zhoushan Island is the main island of the Zhoushan archipelago, located in the south of the Shanghai Sea, east of Ningbo offshore waters, this island is located in the Dawen Empire a dual-use shipyard, but also Li Rujin in the early development of one of the bases for the manufacture of submarines.

Due to the lack of shipbuilding capacity of the Dawen Empire, it was impossible to build large surface ships, so Li Rujin came up with a way to use submarine forces to defend the maritime frontiers of the Dawen Empire, imitating Germany during World War II in the previous life, building a large number of submarines and learning sea wolf tactics.

A more important purpose is to ensure the smooth flow of the Indian Ocean route, so that the oil of the Persian Gulf can be continuously transported to the Dawen Empire, but through a battle with India and Pakistan, it can be said that the problem of the Indian Ocean shipping lane has been solved, but the submarine manufacturing plan has not stopped, and for a long time in the future, the Dawen Empire will still rely on submarines to defend the sea frontier of the Dawen Empire.

Li Rujin quietly came to the Zhoushan submarine manufacturing base, and the previously arrived R&D team to reconcile, after the meeting, Li Rujin got a surprise news that the Dawen Empire had developed a pure electric submarine.

Li Rujin was taken aback, pure electric submarine, what kind of concept is this!

The staff took Li Rujin to a dry dock and saw the pure electric submarine, which was still under construction. The total length of the hull is about 30 meters, the width is about 4.5 meters, and the height is 7 meters (including the bridge).

The bow of the ship is a teardrop-shaped, the paint has not been painted, and there are still a lot of rust spots on the hull, Li Rujin circled around the dry dock, at this time, the staff brought some relevant information, Li Rujin has some understanding of this all-electric submarine.

The design displacement is 180 tons, the diving depth is 120 meters, and it is loaded with six large battery packs, each of which can provide the submarine with a range of 6-8 hours, an underwater cruising speed of 3-6 knots, and an escape speed of 18 knots.

More detailed information, due to the confidentiality system, Li Rujin did not have authorization and could not access it. Li Rujin calculated that the endurance of this submarine is about 144 nautical miles, that is, about 259 kilometers. The combat radius is 110 kilometers, and if it can be resupplied, the combat radius of this submarine can be expanded, but due to its own conditions, the potential for improvement is not very large.

Due to the lack of specific data, the significance of this submarine in actual combat cannot be judged for the time being, but Li Rujin feels that the significance of this submarine to actual combat is not great, and it is congenitally insufficient, and its own limitations determine the significance of its existence.

Like a piece of chicken ribs, it is tasteless to eat, and it is a pity to abandon it. But it's good to use it for sneak attacks, and to play the role of an assassin. If this submarine can be miniaturized and the endurance can be improved, then its role may be greater.

Li Rujin stayed here in the dry dock for a while, and then went to the interior of the shipyard with the staff, along the way, Li Rujin's mind was still thinking about the pure electric submarine, how to transform it, and now, he was inexplicably interested in this submarine.

When I arrived at the shipyard, I contacted the military personnel and went through the relevant procedures. Li Rujin was given permission and instructed the staff to bring over the information of the submarine and carefully understand the parameters of the submarine.

And invited the designer of this submarine to come over and asked him to talk to Li Rujin about the design ideas of this submarine.

Li Rujin's prestige in the army is still very good, plus he is a disciple of the handsome, the military people still give him face, soon, the entire research and development team rushed over, after some greetings, the research and development personnel to Li Rujin introduced the research and development ideas and process of this submarine in detail.

This submarine was born from the submarine designed by Li Rujin, at the beginning, Li Rujin had not developed the engine for the submarine, started the construction of the submarine hull, the whole construction project, although the flood in the south and the suspension of work for nearly half a year, but still manufactured the hull of four submarines, and the internal facilities are almost installed, but the engine has not been in place.

The R&D personnel of the shipyard muttered in their hearts, this engine can't be developed, right? As a remedy, the R&D team developed this small submarine, which could act as a death squad if necessary to attack enemy ships that violated the Empire's maritime borders.

Some detailed data was also told to Li Rujin, this submarine was equipped with 4 torpedoes, which were launched through two launchers in front. The crew consisted of 12 people, including a captain, a chief officer and chief engineer, and the rest were all sailors.

The torpedo is loaded semi-automatically, and the submarine's oxygen supply device is a snorkel oxygen cylinder, and when the snorkel is used to supply oxygen, the submarine must float up every 6 hours or so, and supply oxygen to the compartment through the snorkel.

The use of oxygen cylinders can increase the diving time to 7-8 hours. If it is more than 8 hours, the submarine will have a lack of oxygen supply, and if it exceeds 10 hours, it will cause the death of the people on board.