The sniper starts from the bright sword escape period

Chapter 250 Principles of Underwater Firearms

In fact, after you only need to figure out why normal firearms don't work underwater, it's a breeze to design underwater firearms.

First of all, the biggest difference between water and air is that the resistance of water is more than 800 times that of air, and it is obvious that resistance is an important factor affecting the performance of gun bullets.

In the air, air resistance and speed are in a quadratic relationship. In simple terms, if the speed of the bullet doubles, the air resistance experienced by the bullet will increase four times. If the speed of the bullet increases four times, Then the air resistance will become sixteen times the original.

It is also for this reason, so those small-caliber bullets, such as 900mm bullets, obviously have an initial velocity of more than 800 meters per second, but the supersonic flight distance is not as fast as the [-]mm bullets with an initial velocity of more than [-] meters. far.

In addition to the fact that the latter bullet has a heavier warhead and has a better speed storage effect, there is a bigger reason that the faster the bullet speed, the greater the force it needs to resist air resistance.

After understanding this principle, when Bailixiu shoots underwater firearms, the best way is to reduce the speed of the bullet and increase the weight of the bullet. After all, most people have done it before, and the speed of throwing the harpoon is obviously not enough It is tens of meters per second, but it can easily pass through a fish that is one or two meters underwater. The reason behind this is actually the same.

And Bai Lixiu only needs to replace the 150-gram warhead of the . After that, its speed will drop to more than 250 meters per second.

After all, for a 460-gram bullet, the kinetic energy of the muzzle at a speed of [-] is [-] eight joules of energy.

And the muzzle kinetic energy of a 80-gram bullet with a muzzle velocity of 150 meters also has a kinetic energy of [-] joules.

For this kind of underwater bullet modified from existing bullets, Bailixiu has tested it, and its power and range are actually much better than the data of SPP-1 pistol bullets. At least it can withstand a distance of 30 meters under ten meters of water. Shot through a three-centimeter-thick plank.

Of course, it can not only shoot underwater, but also shoot on water, but because of the low muzzle velocity, when shooting above water, the ballistic trajectory will drop sharply, and it can fall by more than one meter at a distance of 40 meters, so it is also It can only barely be used for emergency defense at a distance of more than ten meters.

Bailixiu took out four bullets with a length of more than 20 centimeters from the kraft paper bag and handed them to Wu Qianli, then said:
"There is a buckle on the gun that can be pushed forward to lift the barrel. Then I saw that there are no four holes. They are used to load bullets. There are only four rounds to be loaded in total. You have to reload after shooting, but The advantage of this gun is that it is not afraid of jamming, just pull the trigger again if you encounter a dud.”

After Wu Qianli loaded the bullet according to Bailixiu's prompt, he asked Bailixiu:

"Can this gun only be fired underwater? Can it be fired above water?"

For such an answer, Bailixiu also replied immediately:

"Of course it can, but you have also seen that the bullets of this gun are heavy and have a low initial velocity, so the bullets will fall a lot when the distance is a little farther. The bullets can fall more than 20 centimeters at 30 meters, and they can fall at least 40 centimeters at 20 meters. Mido, so it’s best to shoot within 20 meters, of course, it’s the same in the water, but the visibility in the water, shooting at [-] meters is very good!”

After Wu Qianli heard Bai Lixiu's words, he aimed at a big tree 20 meters away and fired a shot. The sound of the gun was rather dull, not that crisp sound, and the bullet's landing point was exactly what Bai Lixiu had said. There is a difference of about [-] centimeters between what Wu Qianli aimed at and what Wu Qianli aimed at.

And the 20-meter-like bullets that were like iron rods completely disappeared into the trunk, leaving only a small section of tail less than three centimeters exposed outside the trunk.

Bai Lixiu looked at Wu Qianli and wanted to test fire a second shot, so she quickly stopped her and said:

"Okay! Alright! I don't have many bullets of this kind, so don't waste bullets on the shore, and shoot in the water if you want to try shooting to practice your hand!"

After all, Bai Lixiu just remembered, it seems that the Frogman Special Forces only has 50 people in equipment, and only 50 people are needed. Nothing has been said yet, so Bai Lixiu quickly added:

"You have also seen these underwater pistols. There are only fifty of them. You don't need so many people for underwater operations to blow up warships and aircraft carriers. 50 people, each carrying [-] kilograms of explosives is enough!"

After Wu Qianli heard Bailixiu's words, he also understood that the equipment adopts an elimination system, so he asked with some concern:

"Then what about the eliminated people, they have to be assigned to that unit!"

When Bai Lixiu heard Wu Qianli's words, she naturally understood that Wu Qianli's thinking was a bit wrong, so she hurriedly said:

"I only want fifty frogmen with the best water skills to be selected from your interspersed battalion to serve as frogmen for bombing warships and aircraft carriers. As for the others, they are naturally escorts. Our sea forces know what it looks like." , so if you want to get close to the port of the Mi Army, you still have to penetrate through the land...!"

Before Bailixiu finished speaking, Wu Qianli said:

"I understand that each person's [-] kilograms of explosives plus the weight of the compressed gas cylinder used for diving and the underwater pistol have reached the load limit, and there is no way to carry other weapons at all, so the remaining The next person not only needs to send the frogmen to the port of the Mi Army safely, but also needs to share the weight!"

Bai Lixiu nodded in satisfaction after hearing Wu Qianli's inferences, and then motioned Wu Qianli to explain the fact that the frogman special team only needs 50 people.

Wu Qianli was also unambiguous, and immediately assembled all the soldiers in the interspersed battalion, and then said:

"Although after a month of training, there are still good and bad dives among you. The good ones have white streaks in the waves, and there is no difference between being in the water and on the shore, while the bad ones have just learned the dog planing style, and they still do it from time to time. I choked on two mouthfuls of water.

So there is still one month, we are training for a month, and then select the 50 people with the best water skills to become the official members of the special forces, as for those who are not selected, all become the reserve personnel of the special forces. "

Sure enough, Wu Qianli's words immediately surprised everyone in the interspersed battalion. After all, they were all training and were just a little bit short of becoming a reserve.

Bai Lixiu looked at the noisy scene in the interspersed camp, stepped forward and stood next to Wu Qianli, looked at the crowd and said:

"This time, you are specially drawn from the frontline positions. The purpose of this training is to allow you to perform a difficult and arduous task, and the selection of the best is to ensure the success rate of the task. If any of you are afraid now, you can fight I, Bailixiu, will not make it difficult for me to report the opt-out, and if this mission is successful, then you will all become battle heroes!"

(End of this chapter)