In later generations, the AIP system of submarines has been a technology that various countries are striving to obtain, with low cost and can replace nuclear submarines to some extent, especially welcomed by poor countries.

Among them, fuel cell technology is impossible to achieve in this era, using liquid oxygen, or hydrogen peroxide, is too dangerous, so the safest way is to use Stirling engines.

The Stirling engine was invented by the British physicist Robert Stirling in 1816, so it was named the "Stirling engine".

The Stirling engine outputs power through the working medium (hydrogen or helium) in the cylinder, through cooling, compression, heat absorption, and expansion into a cycle of cycles, so it is also called a hot gas engine.

This Stirling cycle hot air engine does not exhaust exhaust gases, and does not need other air except the original air in the combustion chamber, so it is also suitable for urban environments and outer space, and is an ideal solution to ensure that conventional power submarines can sail underwater for a long time without floating.

It's just that this kind of engine did not enter the real effective application process, and the Stirling engine was proposed to change the low efficiency of the original steam engine, and after that, the gasoline engine and diesel engine came out.

And when applied to submarines, it is the best means.

Many of the people present were technicians and were no strangers to the Stirling engine, and now, when they heard Shirek mention the Stirling engine, they immediately understood what Shirek meant.

It is a relatively prudent plan to use this scheme to realize the covert navigation of underwater submarines.

"However, we don't have the technology, and if we do that, it means we could be delaying the process." A submarine engineer said: "In terms of efficiency, if we improve the existing submarine and add liquid oxygen or hydrogen peroxide compartments, it will be more effective." ”

Ciric shook his head: "But it is very dangerous, I value the safety of our soldiers more than rapid service, for the empire, every soldier's life is precious." ”

This sentence made the hearts of the people around him warm to hear, and now, as the war continues, more and more people in the empire are joining the army and going to fight in all directions, and among these people present, there are many relatives who have joined the army.

Ciric, the most important thing is the life of the soldiers, such a Führer, is worthy of respect.

"Yes, Great Führer, I was wrong." The engineer immediately said that of course he knew how dangerous liquid oxygen and hydrogen peroxide were, and that if he wasn't careful, they could easily explode.

"We can spend one to two years to study this system, without putting forward too high indicators, this kind of Stirling engine, as long as it has a power of tens of kilowatts, it is enough, in addition to supplying the normal lighting, electronic equipment work and living facilities on the boat, the remaining energy can be used to propel the submarine, the submarine only needs to maintain continuous navigation for half a month at a few knots of underwater speed, it is enough."

Historically, the empire has constantly put forward various perverted indicators, resulting in the delay in the development of weapons and equipment, and this kind of mistake is not made by Ciric.

In later generations, it was not until the nineties that the Swedish "Gotland" was equipped with two V4-275R Stirling engines with a power of 75 kilowatts each.

Therefore, the most important thing is not to raise the index too high, so that the submarine has the ability to sail underwater for a long time, and the navigation in the state of the snorkel can be more effectively avoided.

The advantages of Stirling engines are high efficiency, low noise, low pollution, and low operating costs. However, the Stirling engine is less powerful, so it is generally used directly to drive the submarine to slow underwater sailing.

It's just equivalent to adding such a cabin, once you need to travel at high speeds, you still need the original technology.

Ciric put forward low requirements for various indicators, and it played a catalytic role in the invention of this machine, and in two years, Germany should not have a large-scale military conflict with the United States, Ciric needs time to buffer, first solve the problems of the Soviet Union.

At this time, on the other side of the world, a duel between submarines and surface ships has just begun.

Over the Pacific Ocean, the waves are rippling and the waves are less than a meter high, which is a good time to sail.

A large submarine is sailing on the surface of the sea in a floating state, and it is already very good for submariners to be able to breathe the humid sea breeze.

This submarine is not small, with a total length of more than 100 meters and an underwater displacement of more than 2,400 tons, which is definitely the largest of the submarines.

At the front of the hull, the Il-74 is painted crookedly.

Yes, this is the latest Haida 6B submarine in service with the island navy!

The submarine of the island country's navy is named "Yi, Lu, and Bo" in large, medium and small, similar to the Chinese A, B and C, and the I-type submarine belongs to the first class of submarines, with a standard displacement of more than 1,000 tons. And a few years later, the navies of the island countries have built large ones with a displacement of 3,000 tons, or even 5,000 tons.

A submariner, who climbed up from the central conning tower, was not tall and yellow-skinned, and he spoke in a chirping bird language, and then carried a sun flag in his hand.

He climbed up and wanted to hang the sun flag on the mast above the conning tower, but just as he was about to pull the rope, suddenly, a gust of sea breeze blew, and this sun flag was blown into the sea by the sea breeze!

The following chirping bird language continues to come, roughly greeting the women in the other party's family, expressing that they want to have intimate contact with the other party's women, and this is also a kind of charity, not disliking the other party's old ugliness.

"San Lang, you idiot, why did you throw the flag into the sea?"

"Report, I'm not careful, I'll go get a new one."

"This is already the last flag!"

"I'm so sorry."

"I'm sorry bird, take your sheets and paint them as a flag, hurry!" The voices below were even more dissatisfied.

"Yes."

The stupid sailor Saburo ran to his cabin, and soon, a colorful painted flag was hung up.

"Idiot, why don't you use red?"

"There's no red paint, just black ink."

"Baga, pa!" Several big slaps hit Saburo in the face, and after a few blows, blood flowed out of his nose.

"It's red now, paint it!"

After some tossing and turning, a full half an hour, finally, the flag, which was made of sheets, mixed with black paint, and red bloodstains, was hung up and fluttered violently in the wind.

Plugging his nose, Saburo continued to stand on it, and now, he was going to serve as a lookout, which was an honorable and sacred task.

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