After knowing the reason why the outstanding cruisers in history were strong, Xu Jie had to set the technical standards for heavy cruisers according to the current needs of the Huaxia Navy...... Then it involves the trade-off between speed, protection and firepower.

Judging from the current tasks, as long as the cruisers of the Chinese Navy can outrun the battleships, they can completely refer to the speed of France and Italy at about 3 knots. The cruiser of this speed could only run away in the face of two class battleships, the first was the American Iowa-class fast battleship, the most powerful battleship in history, and the other was the second most powerful Risseliege-class battleship, the latter could run at a speed of 3 knots, and the remaining battleships could not run at a speed of more than 3 knots. Taking into account the current situation, the original and prepared battleships of various countries are not so high-speed, then 3 knots is also acceptable.

So how much output is needed to achieve this horsepower, the French Algiers has a displacement of 1 ton...... It ran at a speed of 31.71 knots with 819 hp and a 33.33 knots with 933 hp, while the average maximum speed in 1 hour was 3.93 knots. The Italian Zara-class cruisers, on the other hand, could run at 98 horsepower at 33.87 knots. The output of some ships of the same class has reached more than 10,000 horsepower, and the speed will fluctuate up and down on this standard, so according to this data, Xu Jie believes that the capital ship of the 10,000-ton standard row, in the case of a displacement of 19,000 tons, the maximum output of 1 horsepower is enough to run at a speed of more than 3 knots, after all, the German-American cruiser in the case of a displacement of 10,000 tons, with an output of 10,000 horsepower, can run a speed .........of 3.66 knots.

Therefore, the maximum output power of the new ship is set at 1 horsepower, and according to experience, generally speaking, the maximum output power will be higher than the rated power, that is to say, the rated power is set at 110,000 horsepower, which basically meets the needs. Now Huaxia does not need to reach a high speed of more than 3 knots like the Japanese Navy, and go up with destroyers to launch torpedoes. As long as you can throw off the battleship. Then the purpose has been achieved. The increase in cost caused by increasing power is a problem, but at the same time, it is more important to put pressure on the design, and putting too much boiler will stretch the armor belt, which is easy to say, but what is the specific concept? Xu Jie, as a person who used to use a ruler in front of the computer desk, still has some understanding of this.

The same cruisers, the Japanese Kaohsiung-class cruisers and Tone-class cruisers had a hull length of up to meters! And the Italians' Zara-class cruisers are only 18 meters! And if you look at the length of the main armor belt coverage, then the difference is even more obvious. The Kaohsiung class is a typical Japanese heavy patrol model, and its armor belt length is 13 meters! (This is from Conway's analysis of the battleship, not the author's own comparison.) And the length of the armor belt of the Italian Zara-class heavy cruisers was about half the length of the hull. That's 9 meters! (This is the author's comparison of looking at the picture-!) That is, the length of the armor belt of the Zara class is almost 3 meters shorter than that of the Kaohsiung class! Of course, there is one less turret in the Zara class. However, the problem of the length of the armor box due to the power gap can also be seen from this. THIS IS WHY THE ZARA CLASS CAN ACHIEVE FULL 1MM ARMOR COVERAGE, WHILE THE JAPANESE CRUISERS CAN ONLY COVER THE AMMUNITION DEPOT WITH 14MM INCLINED ARMOR ..........

Then there is the issue of defense standards, historically the Japanese chose defense standards for ammunition depots to defend against 8-inch guns, and power compartments to defend against 6-inch guns. This choice is still relatively rational. In this plane. THE UPPER LIMIT OF FIREPOWER OF LIGHT CRUISERS IS 17MM GUNS, WHILE THE UPPER LIMIT OF FIREPOWER OF HEAVY CRUISERS IS 1-INCH GUNS, ALTHOUGH THE TONNAGE HAS INCREASED, BUT THE DEFENSE IS MORE DIFFICULT, AND GOD KNOWS HOW STRONG THE 1-INCH GUNS OF THIS PLANE WILL BE! Therefore, Xu Jie thought that if you want to defend against a 1-inch gun at a normal engagement distance, you need at least 9-inch inclined armor. This basis of defense was inferred from the defense standards of historical Dunkirk-type battlecruisers. …。

Historically, when the German pocket battleship Deutschland appeared. Once attracted the attention of the world, this kind of guy with a long range and a battleship that could outrun a battleship and a cruiser became the sharpest weapon of the German Navy for a time. Its 11-inch guns were fully capable of penetrating the armor of all cruisers. And as conceived by the German Navy. As long as the pocket battleships can avoid the three battlecruisers of the British at sea, then there is no need to be afraid of other opponents. As a feud with Germany, the French specially designed a small fast battleship to deal with this kind of fast attack ship, which is the famous Dunkirk-class battleship in later generations, in which the Dunkirk in order to deal with the German 11-inch gun, specially arranged MM inclined armor, so according to Xu Jie's estimate, on the basis of the gun is one inch smaller, the armor belt is also appropriately shrunk and reduced by about an inch. It should be able to protect against 1-inch level firepower. If I design it by a quilt cap. IF YOU MAKE A 3MM ARMOR PLATE INTO TWO LAYERS OF 4MM AND 19MM, IT WILL BE EVEN MORE FINE. Even a further reduction in the thickness of the armor can be ..........

ACCORDING TO XU JIE'S PLAN, IF HE CAN, THEN WEAKEN THE THICKNESS OF THE ENTIRE ARMOR BELT TO 1MM AS MUCH AS POSSIBLE...... THE THICKNESS OF THE OUTER ARMOR PLATE FOR THE QUILT CAP IS 3MM, AND THE THICKNESS OF THE MAIN ARMOR IS 18MM. Strive to cover the entire armor belt, as for whether it can be specific or not, it depends on the design. Xu Jie decided to use a single layer of large-thickness armor, which can not only resist the horizontal attack of 1-inch shells, but also resist the dive attack of 1-pound armor-piercing shells at a certain angle. SO THE THICKNESS OF THE HORIZONTAL ARMOR SHOULD BE AT LEAST ABOUT 11MM. The main turret defense depends on the situation, and it is best to have the front of MM. As for underwater protection? Its lightning protection depth should not be less than 3 meters. AND THE THICKNESS OF THE ANTI-MINE ARMOR CANNOT BE LESS THAN MM.

Overall, this defense standard is a bit difficult to achieve for a standard 10,000-ton warship, but considering that everyone may slightly exceed some tonnage in practice, then it is understandable that Huaxia is more than that. If it really doesn't work, make some fuss about the secondary artillery now, install two less secondary guns in peacetime, and then install them when the treaty ends or when the war is fought, according to Xu Jie's layout, the secondary artillery must have at least one 1MM gun, divided into 6 turrets. AS FOR THE MM GUN AND THE 4MM GUN? It depends. Anyway, according to historical experience. It's still relatively easy to add these weapons.........

Then there is the layout of fire, and how the artillery is arranged is directly related to the length of the armor belt. Like the turret layout and 4-turret layout of historical cruisers (which are divided into two types, one is 4 twin main guns, and the other is 3-pack and two-mounted. Xu Jie doesn't like it, Xu Jie still prefers 3 3 guns with 3 units. And there is another bolder idea to go directly to two 4-pack 1-inch gun turrets! If you look at it from the point of view of saving the length of the armor belt, the latter is undoubtedly the most advantageous in the case of guaranteeing the distance between the two turrets.

But let's not talk about the technical difficulty of the 4-pack turret, even if the turret can be built, the stability is passable. The hull width itself is also a challenge, with cruisers historically mostly ranging from 18 meters to 1 meter wide. Even if the tonnage on this plane is enlarged, the increase in width will not be too large, after all, this is limited by the size of the cruiser. And even if it can be loaded. The depth of the underwater defense system in the lower part of the turret will also be weaker, because the bloated ammunition depot will be relatively large, the solution of the French is to increase the thickness of the underwater anti-mine armor, if Huaxia wants to design it this way, it can only be solved in the same way, but this has another advantage, that is, two twin 1MM level anti-aircraft guns can be arranged along the central axis at the stern and bow of the ship, so that the unilateral anti-aircraft fire of the battleship becomes 8 ..........

In short, the choice of firepower layout of the heavy cruisers of the Huaxia Navy will ultimately choose one of these two ways. And light cruisers generally choose a 3-seat 3-group layout. After finalizing the defense, speed and artillery, there were two remaining issues to be solved, one was whether torpedoes were still needed, and the other was the question of carrier-based aircraft. For torpedoes? Xu Jie meant that the light cruiser could consider loading a few rounds. AFTER ALL, THE 17MM GUN IS WORSE THAN THE 8-INCH GUN IN TERMS OF EFFECTIVE RANGE AND POWER, AND THE OXYGEN TORPEDO THAT THE JAPANESE NAVY ONCE HAD IN HISTORY IS KNOWN FOR ITS ULTRA-HIGH SPEED, ULTRA-LONG RANGE AND SUPER ATTACK POWER, ALTHOUGH THE EFFECTIVE RANGE CANNOT REACH THE THEORETICAL NUMBER, BUT IT IS STILL GOOD WITHIN 8KM, AND IF YOU ARE LUCKY, YOU CAN HIT A TARGET 1KM AWAY. So as a supplement to the artillery, a few rounds can be appropriately arranged. …。

Of course, the arrangement of carrier-based aircraft is as much as possible, Xu Jie has not thought about the plan of the aviation cruiser, but considering that once the treaty period is over, if there is a war, Huaxia will definitely put the construction of aircraft carriers in the first place, and there will be no shortage of aviation power at that time. And the construction of gunboats will definitely be postponed, and perhaps even the importance is still after the destroyers, after all, destroyers are still the main force of air defense and anti-submarine and are in great demand. In addition, the construction period of heavy cruisers is relatively long...... So in order to ensure the number of artillery in the fleet, Xu Jie did not plan to build an aviation cruiser. Nor was it intended to use conventional aircraft on heavy cruisers.........

However, Xu Jie still has to deploy some seaplanes on the cruiser, according to historical experience, if all the turrets are front-loaded. Even the historical treaty cruisers could be equipped with 8 seaplanes, and if the Huaxia heavy cruiser adopted the method of 4 main guns in front or 3 in 3 main guns, then it would be no problem to carry 1 aircraft. As for more, it depends. The main role of these seaplanes is to conduct reconnaissance, reconnaissance, and anti-submarine operations. According to Xu Jie's plan. Huaxia will first start construction of heavy cruisers to test the waters, and if successful, start construction of another four. These cruisers will be commissioned by 198 years, which will account for one-half of China's heavy cruiser tonnage according to the treaty. How the remaining 6 heavy cruisers will be built will depend on the situation. And work on the light cruiser will also begin.

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