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Su Qin and Li Yu each trained on their stomachs.

Suddenly, there was a whirl, and a gust of wind blew.

But this wind seems to have been evil, and it is going around the two of them, which is a bit of a whirlwind.

"Evil Sect!" Li Yu took a sip.

Su Qin also raised his head and looked in four directions.

At this moment, the wind was much stronger than just now, but it was very chaotic, the wind in front of the two people was blowing sideways for a while, and the wind not far away was even more changeable.

Su Qin put down the sniper rifle and sat up, Li Yu also sat up, Su Qin patted him: "Don't get busy getting up first, Li Yu, what do you think this wind should be done?" ”

Well?

Li Yu was stunned.

"This situation is very difficult to encounter, it is more complicated, you see, if the two of us are on a sniper mission at the moment, you are an observer, how should you deal with this wind direction?"

Li Yu was stunned for a second, then raised his binoculars and looked at it.

"The wind direction is very complicated now, and the wind direction is not the same at different distances."

After that, he took out an anemometer and measured: "Next to the two of us, the wind within a hundred meters is a whirlwind, and there is no pattern. ”

After a pause, he held up his binoculars to observe.

After a few seconds, he said: "Three hundred meters to five hundred meters, this section is a crosswind on the right side, if the sniper distance is farther, the section from eight hundred meters to a thousand meters, the wind direction is reversed, it is a crosswind on the left." ”

Su Qin nodded: "The basic judgment is correct, then now the problem comes, the upwind direction of this distance is so complicated, so what should you do?" ”

Li Yu frowned.

Regarding sniping, about observation, in fact, the big university hasn't taught him too much, they have been doing the most basic training for a while now, and they haven't taught these advanced calculations and processing.

However, according to this period of study and understanding, he still said his thoughts: "I think it should be like this, we are around us to a distance of 100 meters, this section of the wind direction is very complicated, there is no law, it is a whirlwind, but in fact, this section of the wind can be basically ignored, and the energy of the bullet is enough to dissipate the impact of these winds." ”

"Not bad." Su Qin nodded.

"As for the section of 300 meters to 500 meters, although it is a cross wind on the right side, according to observation, the wind speed is actually not big and can be ignored. What we need to pay attention to is the wind at a distance of 500 meters to 800 meters, first of all, at this distance, the kinetic energy of the bullet drops very much, and any little wind may blow the bullet away, so this section of the wind should be paid attention to. ”

Su Qin nodded and agreed: "Li Yu, remember this sentence, the average shooter studies the trajectory, and the top master studies the wind." ”

What the?

Li Yu couldn't understand it at once.

"If you want to be a top sniper, you have to study the wind. First of all, the Wind Repair will only appear in long-range precision shots. Secondly, if the sniper can also rely on the observation equipment to measure the distance, then the sniper can only rely on his own experience to repair the wind deviation. Li Yu, although you are only an observer, I hope you have always used the standards of a sniper to demand yourself, understand? ”

Li Yu raised his head and looked at Su Qin for a few seconds before he nodded: "Understood!" ”

In real warfare, the observer is not just observing, to be precise, the observer is the secondary sniper, once the main sniper has any problems, the secondary sniper has to be on top without hesitation, so the observer is not just observing.

"So, when you have time, look at the wind." Su Qin solemnly advised.

After a pause, he continued: "My experience is that the distance of 100 meters does not need to consider the wind deviation, and the wind has not had time to exert its power and the bullet has already flown there.

However, if the firing distance is 200 meters, then the shooter should correct the wind deviation as appropriate before firing.

At a distance of 300 meters, even a crosswind of a level 3 breeze with a wind speed of about 4 m/s will deflect the bullet by about half a person.

Half a human body!

Enough to make your mission fail!

I don't know if you've seen the experiment done by sniper experts in the West of the United States, when the wind speed reaches 4.4 m/s, using a 7.62mm bullet to shoot at a target 365 meters away, the crosswind will cause the bullet to deviate sideways by 34.5 cm. ”

Su Qin told Li Yu about his experience and understanding of Feng Yao.

However, it is difficult to say whether Li Yu can comprehend this kind of thing.

Moreover, it is difficult to get a personal understanding without tens of thousands of live firings.

"Today I will teach you to look at the wind direction and repair the wind deviation." Su Qin lay down beside Li Yu.

In order to correct the wind deviation, the first thing to do is to determine the wind direction.

Wind is the movement of air that is invisible to the naked eye.

But snipers can determine the direction of the wind by observing the movement of other objects, such as smoke, such as trees and weeds, and can even determine the direction of the wind by observing the shaking of water waves.

However, it is difficult and challenging for a sniper to determine the wind direction between himself and the target area, and to find evidence indicating the wind direction.

Because the wind in the actual combat environment is often capricious, there is no wind for a while, but there is a wind for a while, and it is possible to blow to the right for a while, in addition to the cross wind, there are also downwinds, headwinds, whirlwinds, and so on.

A sniper may be able to score well on the shooting range very quickly, but in the field, learning to determine the complex wind direction in the combat area can take a long time to grind.

Once the wind direction is determined, the sniper also needs to determine the wind speed.

Wind speed determination before sniping is also very complex.

Although snipers often carry a small dexterous anemometer with them, this kind of thing can only measure the wind force at the sniper's location, and the wind force at this point has little effect on the accuracy of the sniper.

The sniper's eagerness to understand the target, and the wind in the flight range of the bullet, cannot be detected by the anemometer.

At this point, the sniper is required to be able to use the changes in the ground to determine the wind speed.

A normal sniper will measure the direction and speed of the wind based on the swing of objects on the ground, such as the swing of trees.

Some experienced snipers can also use the Phantom to determine wind speed.

The apparition here is not a mirage, but an illusion formed by observing the heat waves on the ground through a scope.

When ranging, the sniper focuses the scope on the target, and then turns the focus knob to make the scene blurred, at which point the rising ground heat waves become very clear.

The sniper can determine the wind speed based on several typical situations in which the scope observes the heat wave on the ground, for example, when the phantom rises vertically, indicating that there is no wind; For example, when the phantom is tilted 60 degrees, it indicates that the wind is about 0.4 m/s to 1.2 m/s.

Su Qin taught Li Yu everything he knew and understood.

Li Yu didn't care if he could understand it or not, and kept them in his heart first.

After teaching the wind and the wind deviation, Su Qin said again: "Next, I will teach you to measure the range." ”

Ranging?

Li Yu was stunned.

Do you still need to teach ranging measurement? Isn't there a laser rangefinder?

Measuring distance is much simpler than measuring wind!

Su Qin smiled: "Although we now have a lot of precise instruments, in a real war, who dares to guarantee what will happen?" Can you guarantee that your rangefinder won't have any problems at all? ”

"......" Li Yu opened his mouth and couldn't speak.

Su Qin sighed and said seriously: "It's good to have good equipment, but ..... Plum Fish ...... Don't entrust your life to these high-end equipment that are not necessarily reliable, you have to control your own life, otherwise you ....."

I don't know what I thought, Su Qin's expression suddenly felt a little lonely.

"Remembered the squad leader." Li Yu nodded hurriedly.

Su Qin quickly adjusted his mood, and he said, "Okay, I'll teach you a few ways to measure distance."

The first is the eye-skipping method.

The observer closes his right eye, stretches his right arm forward, and gives a thumbs up. Select a point on the target and align it with the left side of your thumb. If you don't move your arm, use your left eye to observe, remember where your thumb is pointing on the left side at this time, and estimate the distance between the point and the distant target point, and then multiply it by 10, which is the distance between the observer and the target. ”