Air compressed bombs, which are really good.

It's just a little bad, except for the ant robot can be manufactured, before the end of World War II, don't think about industrial manufacturing, even the United States and Germany, known as the king of black technology, can't do anything, destined to be only small-scale manufacturing, as a gold finger.

It's better to be small than nothing.

What's more, the 182 mm heavy gun, no matter how to study and improve, or reduce its own weight, but there are still more than ten tons, and when the time comes, it will be equipped with a dozen or so guns, and it will be thrown away directly if it is scrapped, even if it is destroyed by the Japanese army, it is not very heartbroken.

By the way, the shells also have to be redesigned, Liu Yun remembered the bottom row of artillery shells during the Vietnam War, the 130mm Type 59 cannon, with a range of up to 38 kilometers, which is simply a black technology in black technology.

Is it hard to play a bottom row? In fact, it is not difficult, it is necessary to set up a gunpowder gas discharge device at the bottom of the shell.

What is the use of a gas exhaust device? It is to reduce the drag of the shell when it flies.

Because when a projectile is flying, it needs to overcome three major resistances, namely gravity, air resistance, and negative pressure at the bottom (backward pulling force), which in hydrodynamic terms, is "the vortex of air that converges at the bottom of the projectile".

The first two are insurmountable, and there is no problem in eliminating the bottom vortex.

Taking the 59-type bottom-row bomb in the Vietnam War as an example, when the propellant is excited and ignited, the gas discharge device is activated, a trace amount of gas is discharged, and the air vortex is dispersed, so as to eliminate the negative pressure at the bottom of the bullet, so the range of the same shape shell and the bottom-row shell exceeds 30% of that of ordinary shells.

However, many things are like this, and they are often easier said than done.

Liu Yun took the elf to ponder for a while, in the virtual illusion, fired tens of thousands of 182 mm shells, and in the end it was still unsatisfactory, the bottom row of shells was not designed, but the bottom concave shells were successfully designed, mainly because this thing is simple enough, just set a groove at the bottom of the shell, and the range extension is more than 20% of ordinary shells.

To put it simply, the bottom concave shell is a shell that adopts the bottom groove technology, there is a groove at the bottom of the shell, after the shell is fired, when the warhead shock wave moves to the bottom of the bomb, the strong turbulent air flow will disperse the air vortex gathered at the bottom of the bomb, and it has better accuracy.

When the shell experiments were successful, a new heavy artillery was also developed.

The new 182 mm heavy gun, in fact, is an enlarged version of the German 170 mm cannon, with a caliber of 182 mm, 36 times the diameter, a gun carriage of 9.4 meters long, a total weight of 13.8 tons, a height of 2.6, a length of 6.8 meters, a width of 2.4 meters, an elevation angle of 0-50 degrees, a 360-degree circular fire, a bullet weight of 102 kg, a rate of fire of 4-6 rounds per minute, an initial velocity of 1060 meters per second, and a maximum range of 52 kilometers.

The above data is, of course, ideal, assuming that it is reloaded by an ant robot and that it uses compressed air shells.

If it is replaced with a normal projectile kit, the ordinary shell weighs 82 kg, the rate of fire is 3 rounds per minute, the initial velocity of the discharge is 935 m/s, and the firing range is 36.2 km, if it is changed to a sub-caliber shell (36 kg weight), the maximum range is 43.6 km, but the power will drop rapidly.

However, when using ordinary shells, the most disadvantageous factor is the life of the barrel.

If you use compressed air shells, you can fire 1,500 shells from the barrel, 1,200 shells at full speed, up to 600 shells if you change to normal shells, and even drop to 400 shells with rapid fire.

In general, the new heavy artillery is not bad.

Even if it fires ordinary shells, it is more than one step stronger than the original German 170 mm heavy gun, and once the two are opposed, the German goods will even be counter-suppressed, which is the advantage of the future people, as well as the high-tech benefits brought by the brain.

As soon as the 182-mm heavy gun was successfully developed, Liu Yun began to frown.

Because he can't find a suitable gunner to serve such a new type of heavy artillery, even if it is a German elite artilleryman, he may not be able to play it, if he plans to train it himself, but he does not know how to train it.

Do they all use ant robots as artillery?

Even if you really do this, you can't wait for a few cannons, because you need at least four ants to play one, and the four links of aiming, loading, delivery, and transportation all require ant robots, and you can only operate forty or fifty guns when you are full.

Moreover, although the 182-mm heavy gun is powerful, it has an Achilles' heel, and it is particularly afraid of blows from the air.

Once the Japanese army made up its mind, if it had to destroy the heavy artillery group, it only needed to concentrate dozens of bombers to wipe out the heavy artillery group, and in the face of tons and tons of bombs, the ant robot had nothing to do, in case it was injured or blown up, Liu Yun just wanted to cry and had no place to cry.

Commander Liu secretly warned himself that when using 182 mm heavy guns in the future, he should either pay attention to the defense of artillery positions and make a fortress group that "never falls", or improve mobility, and never let the enemy approach or be caught by the enemy's air force.

If there is really no way, we must strengthen the 88-mm anti-aircraft artillery group and the struggle for air supremacy, otherwise the heavy artillery group will be a pile of broken copper and iron.

When he exited Liu Yun's virtual illusion, to his surprise, Kong Yuling was actually waiting by his side, as if he was about to collapse, with two dark circles under his eyes, he immediately cried as soon as he woke up.

Commander Liu had no choice but to hug her and comfort her sweetly for a long time before Miss Kong gradually stopped talking.

When Liu Yun was comforting his wife, he also slowly looked at the surrounding environment, only to find that it was the morning of the next day, and the time for studying the cannon this time took nearly twenty hours, no wonder Kong Yuling almost collapsed and turned into a giant panda, it seems that she didn't sleep much last night.

Liu Yun was preparing to undergo mental hypnosis to let Miss Kong get a good night's sleep.

Kong Yuling suddenly remembered something, and hurriedly jumped up from Liu Yun's arms, and said eagerly, "Yicheng, the big thing is not good, yesterday afternoon, an urgent telegram came from Shanghai Hongqiao Renai Hospital, saying that the great writer Mr. Lu Xun was seriously ill and dying, and hoped that the United Pharmaceutical Factory could provide a dose of special medicine."

Liu Yun was shocked, if it weren't for Miss Kong's timely reminder, he would have almost forgotten about it.

In another time and space, Lu Xun died of illness in October 1936, the cause was tuberculosis and emphysema, it is said that with sulfonamides and penicillin, the great writer should not be so easily critically ill, but any time and space has its own law of development, such as the time of the Japanese army's full-scale invasion of China, it should still be July 7, 1937.

Speaking of Lu Xun's critical illness, Commander Liu couldn't help but think of the scene when he first met Lu Xun in Hongkou Park when he first returned to the Republic of China.

He was a great writer, he was running around to buy supplies for the Red Army, and he also took good care of himself, a penniless little person, not only personally signed and sent a book, but also sent a manuscript of the original text, and after a few decades, this is a rare cultural relic at the national level, worth more than millions of millions.

Liu Yun decided to take a trip to Shanghai to see the old gentleman in person.

The great writer once said that "the direction of Lu Xun is the direction of the new culture of the Chinese nation and the direction of the new life", which makes Commander Liu admire the most, or practice "Hengmei coldly pointed at the thousand husbands, bowed his head and was willing to be a son of a cow".

The corners of Kong Yuling's mouth moved, as if she had something urgent to say, but her spirit was a little sluggish.

Liu Yun couldn't help but feel a shock in her heart, and hurriedly took out a dose of primary treatment solution, asking her to take it immediately, and when Miss Kong's spirit recovered slightly, she hurriedly said another bad news.

At around 12 o'clock last night, an urgent telegram came from the western Sichuan side, or a Yue Shan telegram from Yin Qinlan, the original text was sent by Deng Wenting.

Liu Yun quickly glanced at the telegram, to the effect that thousands of road repair workers, during the construction of the railway in Mianning County, were cursed by black witchcraft, thousands of workers were dying, and the other party limited Commander Liu to reply within three days, otherwise they would bear the consequences.

Commander Liu has already left the anger, the road builders have been working hard for a long time, and they have been working hard in the field for a long time, and they have been poisoned and cursed by the vicious wizards, what is the natural reason, he has an urge to kill, but fortunately, he also knows that some things are not in a hurry.

For example, Lu Xun is seriously ill and dying, and he urgently needs special medicine to continue his life, and he will personally go to Hangzhou Bay to investigate the terrain and set up a heavy artillery fortress and so on.

After a period of rapid thinking, Liu Yun came up with a way to achieve both, that is, the soldiers were divided into two roads, because the lives of thousands of road construction workers were very important, and he could not afford to hesitate. As for Lu Xun's condition, it is also very important, so Kong Yuling will go to it in person, and then bring two tubes of therapeutic agents with her.

If it can be cured in time, it is naturally the best, if not, it is necessary to hang the old man's life first.

As for going to Jinshanwei in Hangzhou Bay to survey the terrain of the anti-landing, it can only be temporarily stranded, but you can take the opportunity to visit Lu Xun and let Kong Yuling go to the vicinity of Jinshanwei to have a look first.

However, to Liu Yun's surprise, when he first talked about Hangzhou Bay, Miss Kong was more familiar than him.

Seeing Commander Liu's bewilderment, Kong Yuling took out a military map, which was a military topographic map near Hangzhou Bay, indicating the locations of Jiaxing County, Pinghu County, Jiashan County, Fengxian County, and Shanghai and other counties and cities, and there was a striking red circle on the map, "Jiulong Mountain".

Originally, Liu Yun didn't care, and swept away the words of Jiulong Mountain.

When he casually saw the side of Jiulong Mountain, which was marked "Jinshanwei (County)", he was instantly stunned, it was incredible, and he hurriedly asked Kong Yuling, what is Jiulong Mountain?

Isn't the terrain very high, is there a garrison here now?

Seeing that this guy was so nervous and excited, Miss Kong briefly explained, "Jiulong Mountain, bordering the sea in the south and the plain in the north, is in the cross center of the Shanghai-Hangzhou, Suzhou-Ningbo golden corridor, and there are nine ridges in the north, just like the gathering of nine dragons, so it is called Jiulong Mountain."

"The average altitude is not very high."

"The main peak of Limutai Mountain is 997 meters above sea level, and more than 80 peaks around it are undulating, magnificent, magnificent, Jiulong Mountain has a long history, rich resources, quiet environment, pleasant climate, before the Xinhai Revolution, it was the royal garden of the Manchu Qing Dynasty."

However, Liu Yun didn't listen to these introductions at all, staring at the map in a daze.

The downtown area of Shanghai is close to Fengxian and Jiaxing, and to the west of Jiaxing County are Huzhou, Nanxun and Taihu Lake, which is the famous Taihu South Corridor.

In another time and space, in the later stage of the Battle of Songhu, 100,000 Japanese troops landed in Jinshanwei in Hangzhou Bay, all the way from Fengxian County, invaded the downtown area of Shanghai, and together with the Japanese troops who landed in Wusong, surrounded and annihilated hundreds of thousands of Chinese troops in the Songhu battlefield.

On the other hand, the Japanese army captured Jiaxing County, took the southern corridor of Taihu, and penetrated directly into the rear of Nanjing's defense system, shaking the confidence of the Chinese army to continue to hold on, and finally led to the defense of Nanjing ending quickly, so that 300,000 soldiers and civilians in Nanjing were slaughtered.

What Kong Yuling was saying, Liu Yun turned a deaf ear at all, but asked solemnly, "Yuling, how far is this Jiulong Mountain from Jinshanwei, Jinsiniang Bridge, and Quangong Pavilion?" ”

Kong Yuling was also stunned, and after thinking for a while, she replied with great certainty, "I don't know very well, but I heard the local people say that it is the farthest from Jinshanwei, about sixty miles, and it is more than thirty miles away from Pinghu Quangong Pavilion, and as for Jinsi Niang Bridge, I'm afraid it is more than forty miles."