Bright Sword Military System

As soon as Li Yunlong saw "Ghost Cannon", he lost his temper.

After fighting for so many years, he certainly knows that "ghost cannons" are more effective than bullets in dealing with the devil's artillery towers. With this cannon, five thousand rounds of bullets are enough!

Hearing from the workers that something was wrong with the explosion of the shells, Li Yunlong asked nervously, "What's wrong? Can it be resolved?"

The workers were in a dilemma: "Commander, it's not that I don't say anything, but that I don't know. Director Su said that Comrade Wang Xuexin knew what the problem was! These days, everyone in the arsenal is so busy that they really can't send anyone!"

This is understandable, the war is imminent, the arsenal can produce as much as it can, not to mention there are still a few guns to be driven out.

So everyone turned their attention to Wang Xuexin in unison.

Wang Xuexin nodded and explained: "It's not a big deal, the main thing is...our shells are round-headed shells. If they are fired at the ground at a small angle, the shells are likely to float on the ground and not hit the fuze. It won't explode! If you hit the devil's gun tower That's the problem!"

After hearing this, Lao Jiu opened the ammunition box next to it, and it turned out to be round-headed bullets.

After looking at it, Laojiu added with certainty: "That's the case! The gun tower is built on the ground, so there is no such problem. If we want to hit the ground target, we will use it as a mortar at a steep angle!"

Only then did Li Yunlong feel relieved.

Wang Xuexin asked the workers again: "How many rounds are prepared for each?"

Laojiu answered on his behalf: "Ten rounds!"

The shells are all placed in a box next to it, which is clear at a glance.

Wang Xuexin was a little speechless. There were only ten shells, which meant that there was no chance to test fire... Otherwise, there would be few shells to fire when he arrived on the battlefield.

The worker explained with some embarrassment: "These are filled with smokeless gunpowder. We don't have much smokeless gunpowder, so..."

In fact, there is nothing to say about this. The conditions of the Eighth Route Army are like this, and the arsenal can't help it.

Li Yunlong didn't care so much, he waved his big hand and ordered: "Old Jiu, listen to me! If we have time now, let's practice more, and ask Xiaodongdong if there is anything we don't understand. It's not over with you!"

Lao Jiu had a look of grievance, how could he practice without shells?

But Li Yunlong had no choice but to stand up and respond: "Yes, I promise to complete the task!"

After Li Yunlong left, Laojiu immediately complained to Wang Xuexin: "I said Xiaobei! It's a good thing that our arsenal can make guns, but it's not because I poured cold water on them. Our guns are still worse than the devil's. The devil's guns have rifling There is an aiming device, we don’t have anything here, and we have to shoot accurately, isn’t this embarrassing?”

Wang Xuexin took the experimental data from the worker, flipped through it, and handed it to Laojiu, saying, "Uncle Jiu, don't we still have some data here? All the things that have been shot three times are here! Let's do the math together? When the time comes, it will be good to fight!"

Lao Jiu sighed and said, "That's the only way!"

However, this calculation really surprised Lao Jiu. Usually, Lao Jiu's shooting is mostly based on feeling. At most, he closes one eye and takes a look with his thumb up.

This method is also called "jump eye method". The position of the target is estimated by the deviation distance between the target and the thumb between the two eyes, so you must first close one eye to aim, and then close the other eye to aim.

Just aiming with one eye like in TV dramas is definitely not enough.

After that, judge the angle at which the shell is shot, how far it can hit, how high it can shoot, etc. based on experience.

This kind of operation mostly depends on experience and feeling, and the error is very large. Whether you can hit it depends on luck.

But Xiao Dongbei draws this picture, what parabola, what initial velocity, what acceleration of gravity... after a lot of calculations, it didn't take long for the old wine to be confused!

"This...can it be done?" Lao Jiu asked hesitantly, "Can you figure out where the shells landed with this calculation?"

"Eight or nine is not far from ten!" Wang Xuexin replied.

This is actually a very simple parabolic problem. The mass, initial velocity, and angle of the warhead are known, and then a high school student can calculate the trajectory.

If it was charged with black powder in the past, then it is meaningless to calculate this, because black powder is unstable and incomplete, and the combustion value of gunpowder of the same quality is different. The error is too large to determine the initial velocity, so it cannot be calculated. .

However, the characteristic of smokeless gunpowder is that it burns fully, and there is basically no residue left, so the initial velocity can also be determined, and it is meaningful to calculate the trajectory.

Of course, uncertain factors such as wind speed and wind direction are not considered.

Laojiu looked at the pictures and figures on the paper, and was stunned for a while before slowly shaking his head and said, "Xiao Dongbei, it's not that I can't trust you, it's just that this matter is very important..."

"Uncle Jiu!" Wang Xuexin said, "Why don't I look at the data, let's use this method to calculate how far the third shell can hit!"

Lao Jiu thought for a while, then nodded and said: "Success, there is nothing to lose after doing the math!"

So Wang Xuexin and Lao Jiu counted the third shell fired at an angle of 60 degrees step by step.

First use the formula to calculate the landing time in the vertical direction, and then use the time to calculate the horizontal distance, and the result is 1159 meters.

Lao Jiu was stunned when he saw the data, the difference between the actual landing point and the calculated distance was only seven or eight meters.

This error in hitting a gun tower is completely within the acceptable range.

"It's really possible!" Lao Jiu looked at Wang Xuexin with disbelief, and said, "Then let's try this method?"

"We must try!" Wang Xuexin said, "We have no other way, right?"

Laojiu nodded heavily, but frowned again after a while: "The way to do this is to know the height and distance of the devil's turret, right?"

Wang Xuexin nodded, secretly thinking that this old wine is indeed an old gunner!You will know the crux of the problem at once.

All the calculations just now are the ranges and trajectories from different angles.

In actual combat, it is necessary to deduce the angle range of the artillery from the height and distance of the target gun tower, so that the various elements can be adjusted to hit the target.

Laojiu said worriedly: "Our distance and the like are estimated with a glance. Will it be useful to calculate it then?"

This worry is justified. If the original data is inaccurate, no matter how good, fast, or accurate the calculation method is, it will be useless.

But of course Wang Xuexin has a solution for this.

"I thought there was nothing to worry about!" Wang Xuexin said, "Then let's measure the distance and height of the blockhouse first!"

"That's what you said!" Lao Jiu laughed: "The devil's machine gun is mounted on the gun tower! There are also mines, barbed wire, isolation ditches... The devil can let us go up and measure it?"

"It's not necessary to go there!" Wang Xuexin replied: "It's okay if it's far away!"

Lao Jiu was dumbfounded on the spot, and it took him a while to reply: "You can still be powerful even if you are far away? Are you bragging?"