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Tang Hua: "That's not the case. You should be able to see the waterline model of the target ship in the ship model pool of the design institute, right?"
……
"Under the prescribed 4800-ton displacement and small aspect ratio framework, the warship can use 72000 horsepower to reach the speed you require," said Shigeru Makino, "Even after the third optimization of the line type, we have achieved an incredible Speed figures: 33.1 knots, plus or minus 0.3 knots."
The ship model test pool was not in operation, the water in the tank was quiet, and the wooden ship models were hoisted to the shore.
唐华仔细端详4800吨舰型的水线以下部位。之前他认为4800吨、长宽比8.5:1、方尾的舰型能达到的最高航速在32节左右，不过现在航速的优化略微超出了原先的预估。
The bow of the ship is a flying shear bow connected by opposite arcs at both ends.After the bow, the front half of the ship has a slight concave shape, just like the duck slide or Yamato.
No wonder the speed is so high...
This kind of bow is really low resistance and high speed, but the processing and construction is a bit troublesome.Later, when countries had lower requirements for the speed of warships, they simply didn't need flying clippers.
"Is this a model of a ship with a larger displacement that you researched yourself?" Tang Hua saw that there was a model of the underwater part of a warship that was one size larger.
"This is a 6000-ton model with an aspect ratio of 9.6:1 and a speed of 30.5 knots."
A little bigger will catch up with the 167 ship.But destroyers may not need such a large displacement at present.Besides, a 6000-ton destroyer is a bit expensive.
"Minister Liu, Minister Tang," Makino Shigeru said, "Actually, I also have some new ideas about the hull structure. If I can provide some steel materials, workers and processing tools, I would like to build a scaled-down ship near the research institute." The internal structure model of the warship, and test the optimal design scheme of the main structure such as the keel and ship ribs."
唐华：“大约多大比例尺的模型，1：10，1：8，还是1：6？”
Shigeru Makino: "The ratio is 1:8."
The steel of the model is definitely not a problem. For a 4800-ton warship, the 1:8 model uses less than 10 tons of material.Let Shigeru Makino continue to practice with a group of interns.
"Old Liu, the Navy's ship-to-air defense test in the Bohai Sea should be over," Tang Hua turned to Liu Nai, "I don't know what the result will be."
……
The ship's air-to-air defense test is of course not anti-aircraft, but to see if it can shoot down anti-ship missiles.
The anti-ship missile is YJ-1.The interception weapon was first tested with Hongqi-1 and Hongqi-2, which is a bit like attacking the shield with the spear of the son.
1953年底生产的鹰击-1巡航高度是100~150米，红旗-1和红旗-2最低拦截高度可以到50米，理论上肯定是能拦截的。
The biggest problem is that the YJ-1 missile is too small, the target is small, the radar reflection cross section is small, and the echo signal is weak.If the radar can't capture the Eagle-1, then the anti-aircraft missile is useless at all.
According to the test results, the interception rate of Hongqi-1 and Hongqi-2 is very bad.
红旗-1双发拦截5次，击坠靶弹2次。红旗-2双发拦截5次，击坠靶弹1次。
单发拦截，红旗-1和红旗-2各进行了10次拦截测试，拦截成功率分别是30%和20%。
拦截鹰击-1时最掉链子的是雷达，理论上应该在30公里外就发现鹰击-1，实际情况是雷达能看见发射鹰击-1的图-2（都用的空射版鹰击-1），但图-2丢出去的导弹雷达暂时是看不见的，接近一段距离雷达才能扫到导弹。最远的一次在22公里外发现鹰击-1，最近的一次到10.5公里才发现。
When the distance was found to be less than 12 kilometers, all Hongqi-1/2 interceptions failed.
Contradictions competed, and the spear temporarily took the lead.
Even anti-aircraft missiles are difficult to stop the Eagle-1, and the commanders and fighters of the North Sea Fleet are a little depressed.But in the test plan, there is still a link of anti-aircraft guns intercepting missiles, which must be done.
There is no need to test the 100mm high-level dual-purpose gun. Its turret rotation speed is not as fast as the relative azimuth angle change speed of the missile when it is less than 4 kilometers.
The Soviet Pacific Fleet first came to test with a warship equipped with a 57mm gun. The 57mm naval gun tried to intercept it five times and all failed.
In the interception test of the dual-mounted 37mm naval gun, the North Sea Fleet failed to intercept all three times, and the Soviet Navy intercepted three times and succeeded once.
In the 25mm cannon interception test, the North Sea Fleet successfully intercepted 3 times and 1 time, and the Soviet Navy intercepted 3 times, also successfully [-] time.
In short, the results of naval guns intercepting anti-ship missiles are not that bad, and the captains of the North Sea Fleet who participated in the test also found that the success rate of intercepting guns with smaller calibers seems to be higher.
……
"The biggest problem with this interception test is the search radar. The Hongqi-1 missile fired a total of 20 bombs and hit the air target 6 times. Among them, the search radar found that the 12 interceptions at a distance of less than 4 kilometers all failed, and one of them was even a missile. It roared past the test ship before it was launched in time."
The North Sea Fleet writes a summary report after the test.
"Deducting 4 cases where the radar found that the distance was too close, 16 out of 6 interceptions hit air targets, and the single-shot interception success rate was 37.5%."
"Due to the booster, the Hongqi-2 missile has a relatively large range, so the success rate of interception at close range is not as good as that of the Hongqi-1."
"Previously, the test unit was pessimistic about the effectiveness of naval guns in intercepting anti-ship missiles, but in actual tests, it was found that naval guns actually have a certain success rate in interception."
"The 57mm anti-aircraft gun is almost unable to hit the missile due to low projectile density and slow response."
"The 37mm anti-aircraft gun has a certain success rate, and the success rate of the 25mm machine gun is even close to the Hongqi-1 when it is intercepted by two engines."
"Integrating the performance of the 37mm and 25mm guns, the test unit believes that the advantage of the 37mm gun is that the effective interception distance of the projectile is longer, and the disadvantage is that the magazine loading method it uses cannot achieve uninterrupted continuous shooting of the shells. lower."
"The rate of fire of the 25mm gun is fast, but the effective interception distance is relatively short."
……
The report was delivered to Tang Hua and Liu Nai two days later.
Tang Hua was not surprised by this result, but Liu Nai was a little surprised.
In 1967, during the Third Middle East War, the Egyptian Navy sank the Eilat with Styx missiles. In 1967 and 1973, the Israeli Navy intercepted anti-ship missiles with machine guns on warships as soon as they were in a hurry. Facts have proved that they can indeed intercept The next few.There was even a Styx shot down by a 12.7mm anti-aircraft machine gun.
The Israeli Navy also used machine guns aimed at human flesh at this time.
"How about it, old Liu, come and figure out how to improve the cannon?" Tang Hua said.
红旗-1和红旗-2在拦截反舰导弹时能有一点儿效果，那么红旗-4的拦截率应该更好看一点。二机局现在给红旗-4配用的雷达虽然还是机械方位角扫描，但扫描频率加倍，对低空小目标的信号增益也优化过。导弹方面红旗-4比红旗-1/2打得准，新的舰空导弹发射架俯仰旋转的速率也大于红旗-1/2的旧发射架。
However, the naval gun will have to be greatly changed.
Liu Nai: "Hey, our Dalian Jianxin is imitating the V11 double 37. It seems that we are going to design an improvement plan while imitating. I have a number of improvement directions."
25毫米机关炮最大有效射程2000米左右，双37能到3000~4000米，可能先改双37比较容易些。
The report of the North Sea Fleet clearly states that the biggest problem with the Double 37 is that the firepower is not continuous, and the 5 rounds of magazines are bang bang bang bang bang, and they are finished.The next step is for the gunner to reload the new magazine.The same is true of the Bofors 40mm gun. There is no problem in intercepting propeller aircraft during World War II, but it is not enough to intercept anti-ship missiles.
Either change the ammunition drum with a larger capacity, or use the ammunition belt or the ammunition delivery lane connected from the ammunition depot to the gun tail.
Tang Hua: "Don't just focus on the 37 guns, in fact, the 25 guns also have potential."
Liu Nai: "I don't think it's easy to change the arrangement of the barrel of the 25-gun."
Tang Hua pondered, he had to find a way to guide Liu Nai to only absorb the ammunition and barrel of the 25mm gun, and design a new Gatling gun.
……
Bohai Bay is conducting anti-ship missile interception tests. On the other side of the earth, outside the Norfolk Naval Port in Virginia, the US Navy is also conducting similar interception tests.