As soon as Li Yunlong saw the "Ghost Cannon", he lost all temper.
After fighting for so many years, he certainly knows that against the enemy's turrets, "ghost cannons" are much more effective than bullets. With this cannon, he can do without five thousand rounds of bullets!
At this moment, when he heard the workers saying that there was something wrong with the shells exploding, Li Yunlong nervously asked: "What's wrong? Can it be solved?"
The worker was in a dilemma: "Captain, it's not that I didn't tell you, but I didn't know. Director Su said that Comrade Wang Xuexin knew what the problem was! Everyone in the arsenal has been so busy these days that we really can't send anyone here!"
This is understandable. With the war approaching, the arsenal can produce as much as it can, not to mention how many cannons still need to be driven out.
So everyone unanimously turned their attention to Wang Xuexin.
Wang Xuexin nodded and explained: "It's not a big deal, the main thing is... our artillery shells are round-headed shells. If they are fired towards the ground at a small angle, the shells are likely to float on the ground without hitting the fuse and not explode! It will not be used to attack the Japanese turrets.
That’s the problem!”
After hearing this, Laojiu opened the ammunition box next to him and found that it was indeed a round-head bullet.
After looking at it, Laojiu added with certainty: "That's what it is! The turret is standing on the ground, so there is no such problem. If we are to hit ground targets, we will use it as a mortar at a steep angle!"
Li Yunlong was relieved.
Wang Xuexin asked the worker again: "How many rounds of ammunition are prepared for each door?"
Laojiu answered on his behalf: "Ten shots!"
The shells are placed in a box next to them, clearly visible 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 on the battlefield.
The worker explained with some embarrassment: "These are filled with smokeless gunpowder. We don't have much smokeless gunpowder, so..."
There's actually nothing to say about this. The conditions of the Eighth Route Army are just like this, and there's nothing the arsenal can do about it.
Li Yunlong didn't care about so much. He waved his hand and ordered: "Old Jiu, listen to me! Now that we have time, we will practice more. If there is anything you don't understand, just ask Xiao Dongbei. If you can't hit it by then, I will
I’m not done with you!”
Laojiu had a look of grievance on his face. How could he practice without even having cannonballs?
But after Li Yunlong gave the order, he had no choice but to stand up and answer: "Yes, I promise to complete the task!"
After Li Yunlong left, Laojiu immediately complained to Wang Xuexin: "I'm talking about Little Northeast! It's a good thing that our arsenal can make cannons, but I'm not pouring cold water on it. Our cannons are still inferior to those of the Japanese. The Japanese cannons have rifling.
There is a sighting device, but we don’t have anything here, and we have to shoot accurately when we come up. Isn’t this embarrassing?”
Wang Xuexin took the experimental data from the worker, flipped it over, handed it to Laojiu, and said, "Uncle Jiu, don't we still have some data here? All the things that fired three rounds are here! Let's do the math together?"
When the time comes, it will be a good idea to fight!"
Laojiu sighed and said, "This is the only way!"
However, this calculation really shocked Laojiu. Usually, Laojiu mostly relies on feeling when he has sex. At most, he just sticks his thumb up and closes one eye to take a look.
This method is also called the "jumping eye method". It estimates the position of the target based on the deviation distance between the target and the thumb between the two eyes, so you have to close one eye to aim first, and then close the other eye to aim.
Just like in the TV series where you can only aim with one eye, that's definitely not possible.
After that, we can use experience to judge at what angle the cannonball can be fired, how far it can hit, how high it can shoot, etc.
Most of this operation relies on experience and feeling, and the error is very large. Whether you can hit it or not depends entirely on luck.
But when Xiao Dongbei drew this picture, what was a parabola, what was the initial velocity, what was the acceleration of gravity... After a lot of calculations, I was confused after a while!
"Is this... possible?" Laojiu asked hesitantly: "Can we figure out where the cannonball landed?"
"It's almost ten!" Wang Xuexin replied.
This is actually a very simple parabola problem. If the warhead mass, initial velocity, and angle are known, a high school student can calculate the trajectory.
If black powder was used for charging in the past, then the calculation would not make much sense, because the black powder is unstable and incomplete combustion, and the combustion values of gunpowder of the same quality are different. The error is too large to determine the initial velocity, and there is no way to calculate it.
.
However, the characteristic of smokeless gunpowder is that it burns completely and basically leaves no residue, so the muzzle velocity can also be determined, and it is meaningful to calculate the ballistic trajectory.
Of course, uncertain factors such as wind speed and direction are not considered.
Laojiu looked at the pictures and numbers on the paper. He was stunned for a while and then slowly shook 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, "How about I don't look at the data and we use this method to calculate how far the third shell can hit!"
Laojiu thought for a while, then nodded and said: "Sure, there's no loss after all!"
So Wang Xuexin and Laojiu worked step by step to count the third shell fired at an angle of 60 degrees.
First use the formula to calculate the landing time in the vertical direction, and then use the time to calculate the horizontal distance. The result is 1159 meters.
Laojiu 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 is completely within the acceptable range when hitting a gun tower.
"It can really work!" Laojiu looked at Wang Xuexin with disbelief and said, "Then let's try this method?"
"We have to try it!" Wang Xuexin said, "We have no other choice, right?"
Laojiu nodded heavily, but after a while he frowned: "This method requires knowing the height and distance of the Japanese gun towers, right?"
Wang Xuexin nodded, secretly thinking that this old wine is indeed an old gunner! He immediately knew the crux of the problem.
The calculations I just made were all about 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 turret, so that the various elements can be adjusted to hit the target with one hit.
Laojiu said worriedly: "We only estimate the distance with our eyes at a glance. Will this calculation be useful at that time?"
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 Wang Xuexin certainly has a way around this.
"I thought there was nothing to worry about!" Wang Xuexin said: "Then let's measure the distance and height of the turrets first!"
"That's what you said!" Laojiu laughed: "The Japanese machine guns are mounted on that turret! There are also mines, barbed wire, isolation trenches... Can the Japanese allow us to go up and measure them?"
"There's no need to go up there!" Wang Xuexin replied: "It's fine if you stay far away!"
Laojiu was stunned on the spot. It took him a while before he responded: "You can still gain energy even though you are far away? Are you bragging?"