The submarine tests of the Dawen Empire were carried out very successfully, and a large number of extremely valuable and detailed data were obtained, which will continue to be an important basis for the continuous modification and improvement of the submarine.

The admirals of the Dawen Empire are also very excited, the success of the test means that the time to join the combat sequence of the submarine is one step closer, how terrifying the combat effectiveness of this submarine is, they already have a certain understanding, the torpedo embrasures in the front four and the back two are daunting.

This submarine is equipped with a total of 18 torpedoes, 12 in the front and 6 in the back, and the torpedoes are based on the electric propulsion torpedo designed by Li Rujin, who designed a torpedo three years ago with a range of 60 kilometers and a speed of 45 knots.

Later, the military's scientific and technological personnel reformed and developed the torpedo, shortened the firing range, and cut the firing range directly by half, to 30 kilometers, but the speed was greatly improved, reaching a terrifying speed of nearly 60 knots. As a result, the size of the torpedo did not shrink, but increased considerably.

At a speed of 60 knots, which is equivalent to 111 kilometers per hour, a terrifying speed, basically no ship can escape its attack as long as it is included in its attack circle. With a range of 30 km, it is already basically enough to meet the needs of the fight.

In fact, submarines generally attack within a range of 10 kilometers, beyond 10 kilometers, the hit rate of torpedoes will drop a lot, and there is no guidance system for torpedoes in this period, in order to improve the hit rate, it is natural that the closer the distance to launch an attack, the better.

Of course, they also exposed themselves to the range of the enemy's naval guns, which also posed a certain threat to their own safety. Therefore, submarines will pursue the first hit rate, and if they can't attack the enemy ship at the first time, then their own safety will really become a big problem.

The detailed data was also sent to Li Rujin's hands, and Li Rujin sighed slightly in his heart after reading the data, some data still failed to meet Li Rujin's expectations, such as the economic speed of the submarine underwater, only a little more than two sections, and not even three sections.

In Li Rujin's expectations, the underwater economic speed should be able to reach between 3 and 6 knots, but now it is good, even the minimum value has not been reached, and there will inevitably be some disappointment in my heart. As for the escape speed, it was only a pitiful sixteen knots, and the maintenance time was only an hour.

At present, military ships generally have a speed of more than 20 knots, and the speed of this sixteen knots is a bit insufficient. It is important to know that the self-defense capability of submarines is extremely limited.

In addition, the noise of the submarine diesel engine is relatively large, mainly because the technology of the research institute has not yet matured and has not been applied in this sea trial.

After Li Rujin read the data, he wrote down a few improvement plans in the record book, first, to increase the speed of the submarine, this can be solved in two aspects, first, improve the number of propeller blades, now the ship propeller of the Dawen Empire is still the traditional three-bladed propeller, if it can be changed to a five-bladed propeller, it can not only increase the speed, but also further reduce the noise of the submarine.

But this technical difficulty is not small, the five-blade propeller is much more difficult to manufacture than the three-bladed propeller, and to recalculate the angle and size of the propeller, this is not a simple job, there are many things to do.

In addition, increasing the power of the engine and further optimizing the shape of the hull, there are three main resistances for the submarine to sail underwater, friction resistance, protrusion resistance and vortex resistance, of which the vortex resistance and friction resistance can be overcome by changing the small structure on the outside of the hull, such as increasing the skin to reduce the frictional resistance, and adding small protrusions to the skin to reduce the vortex resistance.

But these still need to be solved through a long period of technical research and development, in order to solve the speed problem now, the most direct means is to reduce the protrusion resistance is the most practical, the bridge of this submarine is still upright, that is, a cylinder is directly stuck on the hull, so the protrusion resistance is relatively large.

If you change to a streamlined type, you can greatly reduce the resistance of protrusions. After Li Rujin wrote these points in the notebook, he pondered whether to set up another R&D team to do these tasks?

Li Rujin didn't know that when the Dawen Empire was doing submarine tests, the Europa Empire also ushered in a war monster, and the 25,000-ton super-heavy cruiser customized by Europa in England had left England and was sailing all the way to the port of Marseille in France.

In fact, this war monster can no longer be described as a super-heavy cruiser, it should be considered to belong to the category of battleships, and it may be more appropriate to call it a battlecruiser.

The ship was equipped with three triple-barreled main guns, two in the front and one in the rear, a total of nine, with a barrel caliber of 12 inches (305 mm) The Europa Empire also wanted to load a 14-inch caliber heavy gun, but due to the recoil was too great, the displacement of 25,000 tons could not resist at all, and only 12 inches could be used.

In addition, there were six eight-inch secondary guns, four 12-mm twin-mounted machine guns, and four 110-mm twin-mounted anti-aircraft guns.

If you want to destroy it, the capital ships of the Dawen Empire may be able to kill it. But the Europa Empire never imagined that the navy of the Dawen Empire suspended the development of surface ships and instead went all out to develop submarines, and they were attack submarines with terrifying combat effectiveness.

In the future naval battle, it will give the Europa Empire a vivid practical lesson, so that the Europa Empire will thoroughly understand what it means to be small and big!

The port of Marseille in France held a grand welcome ceremony for the arrival of this giant ship, and the date, only one day later than the submarine trial ceremony held by the Dawen Empire in Zhoushan, is destined or a coincidence, no one can say.

The Europa Empire lost inexplicably to the Dawen Empire in two wars, and the Europa Empire learned from the pain and calmed down, on the one hand, studying the tactics and new weapons adopted by the Dawen Empire in the two wars.

On the other hand, the vigorous development of the country's military strength, especially the research and development of new weapons, has invested a huge amount of money, and the air force has inevitably entered the eyes of the military experts of the Europa Empire.

Especially in the bloody plan, the ingenious application and amazing achievements of the Dawen Imperial Air Force. Let the Europa Empire realize that the future war is no longer on land and sea, and now it has added a wider battlefield --- sky.

The Europa Empire developed a completely new strategic development direction, placing the development of the Air Force as the first development sequence.