The entire World War II was an era of rapid development in science and technology, and all relevant military science and technology were developing rapidly.

In World War II, Germany adopted wolf pack tactics, and the Allies, the development of underwater listening equipment, to an extreme, sonar, a special equipment to detect underwater sound, rapid development, noisy submarines, are often found.

In this way, higher requirements are placed on submarines.

Now Germany is equipped with XXI-class submarines, has been improved, the biggest difference is that the previous ship type has been abandoned, changed to the common elongated teardrop shape in later generations, this kind of submarine has excellent underwater navigation ability, is the first kind of underwater speed exceeds the surface speed of the submarine.

The same is true of this nuclear submarine, which was developed from it.

"If it is a diesel-electric submarine, the diesel engine is the biggest source of noise, and now we use nuclear power, the circulating pump in the nuclear reactor and the steam turbine behind it are the biggest source of noise, and we use various schemes, such as arranging the shock absorbing base, etc., to reduce the noise."

The speaker is a submarine designer, in the development of this nuclear submarine, all aspects need to cooperate closely, nuclear power design, nuclear power experts and submarine experts work together.

"In addition to the noise of the submarine's engine, the other main noise is the propeller." At this time, Ciric continued to transform into an expert.

Of course, the designers have noticed this, but they have not yet found a suitable solution, but Ciric, who came from later generations, is of course clear about this.

Now, the hull has only begun to be built, and the propeller and other parts in the tail are not yet in place, but, without looking, Ciric also knows that it must be the most common kind of three-bladed propeller.

"If you want to reduce the noise of the propeller, you have to reduce the speed, and if you reduce the speed, the thrust will be insufficient, and the solution is to increase the number of blades." "The current three-bladed propeller is backward, we can change it to a seven-bladed or nine-bladed propeller, and at the same time, the propeller is also changed to a large sideways structure. ”

After speaking, Ciric drew on a drawing, in this hot factory.

The propellers, all of which have an odd number of blades, are designed to eliminate symmetrical vibrations, and at the same time, large side skews are a way to reduce noise.

It's just that how to skew, especially how to process, is a huge problem, in later generations, it can be achieved with multi-axis linkage CNC machine tools.

Ciric just proposed an idea, and then how to do it, it was left to these engineers to figure out a way, not to the level of the future, as long as it was more advanced than the current one, that would be enough.

"As for the hull, I suggest that a layer of rubber sound-absorbing tiles can be laid on the hull, which can continue to block the internal noise from spreading outward, and how to manufacture it still needs your collective efforts, not necessarily installed on the current submarine, you can carry out technical pre-research to prepare for the later submarines."

"Führer Ciric, your insightful vision is admirable." Heisenberg said.

Führer Ciric is an all-rounder, capable of putting forward unique opinions in any aspect, and more importantly, it has been proven to be completely correct.

Propellers need experts in fluid mechanics, and silencing tiles need experts in materials to work in the direction proposed by Cirek.

Ciric continued to walk on the slipway, watching the flames of the arc splash everywhere, watching the components of the submarine being formed, and his heart was filled with emotion.

Nuclear submarines, in addition to being used to attack enemy warships, are more prepared for later nuclear bombs.

This is a long road, the test explosion of a nuclear bomb will take several years, the miniaturization will take a long time, and the launch vehicle will have to be installed on a submarine, and there will be many problems to overcome.

However, no matter how big the investment, these technologies must be broken through, after all, this is the capital that will dominate the world in later generations, ballistic missile nuclear submarines!

The nuclear submarine is a brand-new equipment, with a huge displacement, which will drive the progress of torpedoes, sonars and so on, and Germany will continue to maintain breakthroughs in submarine technology.

"Once commissioned, this submarine will be revolutionary, and it will be underwater from the moment it leaves port until it returns." Dönitz sighed: "It's a pity that the cost is too high, if only our conventional submarines could also sail underwater for a long time." ”

The cost is high, and the number is destined not to be too much, you know, in Dönitz's plan, his submarine force, there must be hundreds.

Before leaving, hearing Dönitz's exclamation, Ciric suddenly remembered another thing, a low-cost submarine modification scheme, known as the AIP technology of the nuclear submarine of a poor country!

In fact, as early as before and after World War II, Germany and the Soviet Union were involved in the research of AIP power units.

For example, in 1935, the 18th Central Design Bureau of the USSR proposed the use of the AIP system on submarines, and tested it on the M-92 submarine, which obtained a large amount of test data.

At the same time, during World War II, the German company Walter also tried to use compressed hydrogen peroxide in submarines as a source of oxygen for diesel engines under water.

Conventional power submarines use diesel engines, and the work of diesel engines, in addition to the need for diesel, is oxygen, underwater, below the depth of the snorkel, without an oxygen source, the diesel engine cannot be started.

Therefore, as long as oxygen is carried, the diesel engine can continue to work, and the exhaust gas can be discharged from the submarine, preventing the people in the submarine from suffocating.

Only ordinary oxygen is carried, which requires a huge volume, so it can carry liquid oxygen, reduce the volume and increase the range.

It's just that liquid oxygen is not easy to produce, and it is also difficult to store at low temperatures.

In this way, the substitute for liquid oxygen is hydrogen peroxide, which can be broken down into oxygen and water. When the submarine is running underwater, hydrogen peroxide is heated by the thermal energy of the diesel engine, and then oxygen is produced for the diesel engine. Later, Germany built a small number of such AIP submarines.

However, Ciric doesn't like this kind of thing, because hydrogen peroxide is extremely unstable when converted to oxygen!

From a technical point of view, it is possible to improve the existing submarines, and even insert a compartment and add a hydrogen peroxide canister, but Ciric does not like this technology, and the submariners are risking their lives to carry out the mission, let alone let them increase the unsafe factor.

Therefore, it is better to choose the technical solutions used by later generations of Huaxia.

"Guys, have you heard of the Stirling engine?" Ciric said.