The submarine project of the Tang Empire has been in a difficult state. On the one hand, the Navy has achieved great military success in aircraft carrier combat groups, which has led to a decline in the status of submarines. On the other hand, the Tang Army General Equipment Administration has too high requirements for submarines, which has forced submarine experts to spend a lot of energy in research and development.

The culprit of all this is actually Zhang Meng. Although he had corrected his mistake of promoting growth a few years ago, what he said was an imperial edict. Even though he later asked the General Equipment Administration to lower the standards for submarine design and development, the invisible influence still exists when it was actually implemented.

According to Zhang Meng's initial requirements, he hoped that the Tang army's submarines would have sufficient submarine time and sufficient safe diving depth to avoid the pursuit of enemy ships and to have sufficient silent effects to prevent being detected by the enemy's underwater monitoring equipment. These requirements are undoubtedly of high standards for the world submarine manufacturing level in the 1930s.

The general standard for submarines in the 1930s was 80 meters in the maximum submarine depth, and the maximum submarine time would not exceed 24 hours. This was still at the lowest speed of 3 knots. If it was a cruise speed of about 14 knots, it would be at most two hours. The silent effect was almost impossible, because it would be difficult for any submarine to avoid being savaged by the enemy unless it was not moved.

With the continuous progress of the material processing technology of the Tang Empire, the industrialization of rare metal refining provides the Tang military industry with a large amount of high-strength, pressure-resistant, corrosion-resistant alloy special steel. Submarine experts used them in submarine manufacturing, which ultimately enabled the Tang army's submarine to withstand the water pressure of 400 meters to navigate, solving the problem of maximum safety submarine depth.

The problem of submarine time is much more complex and difficult than the maximum safety diving depth. Tang Jun submarine experts had to ask scientists and scholars in other professional fields for help, and use air regeneration technology in submarines to improve battery storage capacity and improve motor efficiency to achieve a huge improvement in maximum submarine time.

With the successful test of Tesla's orbital kinetic gun technology by the National Academy of Sciences, Tesla personally designed a high-capacity battery technology that provides instantaneous electrical energy for electromagnetic guns. After the improvement, it developed a lead-acid battery pack with higher performance. Coupled with many improved high-efficiency motors, it was finally installed on the submarine, allowing the submarine to submarine for one month at a speed of 3 knots.

But another key problem is that the oxygen supply cannot last for a month. Installing an oxygen regeneration device in a submarine is too expensive and the efficiency is too low. In the end, it is better to increase the reserve of liquid oxygen tanks to replenish oxygen. However, in this way, the submarine has to return to the base or look for a submarine mothership to replenish oxygen tanks every once in a while. There are both advantages and disadvantages.

The last problem is to avoid the enemy's sonar detection. The traditional method is to stay still, but the experience of the Tang Dynasty's navy in anti-submarine forces shows that staying still is more dangerous.

The guidance given by Zhang Meng shows that a rubber synthetic material can better absorb sonar detection waves and reduce reflective energy.

According to Zhang Meng's guidance, the submarine experts began to focus on rubber materials, and asked dozens of top chemical experts to synthesize various rubber composite materials, and then conducted sonar wave absorption tests one by one. In a few years, they finally found a member of the rubber composite material family. It was superimposed with foam boards inside and outside to effectively insulate and reduce noise.

With the rough solution of the three key issues, Tang Jun submarine experts can finally complete the submarine research and development indicators given by Zhang Meng back then.

As a new generation of conventional power submarines developed by the Tang Empire, the Carp-class submarine came into being. After a complex sea trial, it was recognized by Zhang Meng and the Navy.

The standard displacement of Carp-class submarines has increased by more than 1,000 tons compared with the V-4 submarine. The water surface reaches 3,700 tons, 5,200 tons underwater, and a length of 120 meters. The increased space and tonnage are mainly allocated to 8 battery packs, 2 Trd motors and 12 oxygen and freshwater reserve compartments, which enables the submarine time to last for one month. This military role is self-evident.

The main engine uses 3 TMN type 6-cylinder 4-stroke diesel engines, dual propulsion shafts, and a water droplet-shaped shell structure, which greatly reduces underwater resistance. Therefore, the external weapon system has also been removed, making the surface speed reach 18 knots, and the underwater speed exceeds the surface speed, reaching 26 knots. The individually designed x-shaped tail rudder makes the submarine's underwater safety and handling excellent.

The military equipment is 6 533 mm torpedo tubes (6 bows), and 24 torpedoes are loaded. The number of crew members does not increase but decreases, from the original 85 to 65, reducing the logistics burden.

Of course, in the past, because the knowledge level among the Tang army submarine soldiers was low, there were only many people arranged. Now, after years of training, the cultural quality of the Tang army submarine soldiers has been greatly improved, and many operations do not require so many people to complete, so the personnel can be reduced accordingly.

The carp-class submarine is called an oceanic black hole by Zhang Meng because the shell of this class of submarines uses rubber silence tiles for the first time, in order to greatly absorb the detection wave energy emitted by enemy ships and reduce the reflected energy, making it impossible for the enemy to hear the true position of the submarine. In conjunction with this, a layer of foam board is laid inside the submarine, especially in the computer room, where the foam board is laid with three layers, making it difficult to hear the sound of the engine from the outside.

In this way, the noise of carp-class submarines is very small, especially during submarines, the sound of the oars is minimized, almost the same as the noise in the ocean. In this era, sonar equipment is still very simple, and the enemy will not be able to listen to the location of the carp-class submarine, or even know the existence of the other party.

In order to test the silent ability of Carp-class submarines, Zhang Meng specially ordered the Navy to transfer more than a dozen anti-submarine destroyers equipped with the most advanced sonar detection equipment, and ordered the most experienced sonar soldiers to conduct anti-submarine searches to find the location of Carp-class submarines.

As a result, over a whole month, more than a dozen advanced anti-submarine destroyers of the Tang army did not find the location of the carp-class submarine. Instead, they were attacked one by one by the other party and were "sinked" one by one.

This result was shocking. Zhang Meng was very happy that the Tang Empire finally had a world-leading submarine. The Navy Department immediately approved a plan to build a carp-class submarine on a large scale, and listed it as a S-class secret. It still claimed to be a V-4 submarine.
Chapter completed!