Lu An once again put on his tactical backpack, which contained a slingshot, as well as two hundred and fifty warheads with a mass of two grams, and sixty-two large warheads with a mass of thirty-six grams. The warheads are all made of iron.

Because the school is strict in order to prevent fires, high-power electrical appliances are not allowed to be used. Therefore, the method of melting and casting aluminum cans with a sediment abrasive cannot be used. However, as long as you have money, you can find a hardware store to help. Five dollars for a large projectile, two dollars for a small projectile. Enough money can be very careful about the processing of the surface.

These projectiles are not visible to outsiders, because they do not see what the bullets look like, and they are not even qualified as slingshot projectiles, because they do not conform to aerodynamics.

The small projectile is a combination of a regular cone column (the cone is cut into the head) and a date core-shaped cone, the small area of the cone column and the large area of the bottom surface are round, and the date core cone is embedded in the center of the larger bottom surface. And when it was launched, it was right in front of a large area of bottom with a sharp cone inserted.

Small at the top and large at the bottom, the orientation is sharp, sharp and sharp to facilitate shuttle, while the large area facing the front, according to the normal air resistance, will obviously deflect under the wind resistance. This is not qualified as a slingshot projectile.

But Lu An's ability is precisely unimpeded, and the large area in front is to detach the date core from the chassis at the last moment of impact, so that the date core penetrates, and the big head of this cylinder completes the collision. As long as the speed reaches a certain speed, after the small jujube core completes the penetration of the armor, the base behind it completes the collision and the debris generated carries heat and kinetic energy into the tunnel opened by the jujube core.

This is the effect of the armor-piercing bullet of the tank, the long rod penetrates the half-meter-thick homogeneous steel plate, and a large amount of debris flames are poured into the tank along the long rod of the armor-piercing bullet, the tunnel pierced, forming a destructive effect. In order to ensure the armor-piercing efficiency of the tank armor-piercing projectile, the long rod of the armor-piercing bullet must be long enough, otherwise when penetrating the armor, the long rod will wear out prematurely, so that the penetration depth is not enough. And Lu An only needs to prepare an object the size of a jujube core, because the iron jujube core is wrapped around a membrane, and on this membrane, mechanical energy is not allowed to be converted into internal energy, so the iron jujube core will not wear out, only the armor penetrated by the iron jujube core will be deformed when it is crushed. The jujube kernel will become dense under the uniform extrusion of the membrane, and the jujube kernel will not be deformed under uniform external force.

The jujube core only penetrates the channel, the lethality is too weak, and the jujube core will not produce a lot of friction heat energy with the armor like a long rod. Therefore, kinetic energy is still needed to be released within the target. This is the reason for the base of the cone column in which the jujube kernel is embedded. Absolute collision, absolute smashing. The speed of the impact is fast enough, and the surface of the armor will erupt into a violent fire.

And this metal projectile, which weighs only two grams, is not fired by a slingshot. The slingshot does not provide the ideal muzzle velocity.

The slingshot fired by the slingshot is a large projectile of 36 grams, and the overall appearance is that a small projectile has a long cylinder added to the back of the thing.

Actually, this structure is a little more complicated. Because the front end of the jujube core is not embedded in a large area of the ground with a solid cone, but embedded in a bell mouth, and the small mouth of the bell mouth is connected to a small hole in the back cylinder.

If this projectile advances, the air in front of it will be poured into the bell mouth, then compressed in a straight tunnel inside the cylinder, and then ejected at the tail of the cylinder. Inside the cylinder are solids of paraffin wax and pulverized coal.

The overall structure looks like a missile without an ignition device. When the slingshot is ejected, the projectile is both inside and outside, there is no resistance, in the initial ejection, the air from the bell in front of the projectile is compressed after inflow, and the kinetic energy is stored as absolute elastic potential energy. Then the elastic potential energy is quickly released at the tail,

As long as Lu An is properly controlled, the internal space of the projectile disappears without obstruction. In a small air passage, the elastic potential energy of the air is immediately and quickly converted into internal energy. The ejection energy granted by the slingshot, like a spark caused by pulling a flint, completes the ignition step inside the projectile. (Diesel engines are ignited by compressed air.) ）

In this case, the internal interface resistance properties can be flexibly controlled, and the combustion efficiency can also be controlled. This is a rocket that does not need to be ignited, and there is no need for various pipes to control the rate of fuel burning. Ignition is the process of removing the unobstructed film, and coordinating the projectile attitude and controlling the internal combustion efficiency can also be completed by the unobstructed film.

In the end, the entire large projectile was mostly outside without resistance, and the tail was sprayed with chemical energy. In the end, it can advance the warhead in front of the large projectile to 1800 meters per second (note that this is not the ultimate speed, and a higher speed can be increased by two times, but Lu An's control ability is limited and can't do it), this speed is better than the discharge speed of a heavy sniper rifle of 1,500 meters. Capable of shooting through armored vehicles.

One gram of standard coal is more than 7,000 calories. The number of joules converted to is 30,000 joules. The thermal efficiency of a rocket engine (the conversion of the calorific value of combustion into mechanical energy) is fifty percent. The entire projectile was loaded with eighteen grams of mixed solid fuel with a mass of thirty-six grams. If perfectly burned and released, there should be 270,000 joules of energy acting on the projectile, while the kinetic energy of the heavy sniper rifle is only 150,000 joules. That's an eighteen-fold difference in energy.

However, Lu An was far from being able to exert the maximum value of the projectile, because Lu An would partially restore the resistance of the shell many times to adjust the flight attitude of the projectile (in Lu An's eyes, it was a flying point of light, a line pulled out. If the line is not straight, it must be adjusted)

Unhindered may not seem like an earth-shattering effect at first glance, but it's a control-oriented superpower that controls the energy transition between mechanical and internal energy. These days, Lu An has been training this ability to control the formation of the internal and external interfaces of the projectile.

The missile needs to be refined, otherwise the flight attitude is unstable, this Luan can be replaced with super energy, missile ignition, missile control, and Luan are all replaced by super power control. The only flaw is that Luan may not be in control.

If someone makes a control chip for their projectile to assist Lu An's control, Lu An will save a lot of trouble. But without such convenience, Lu An could only control it himself, and rehearsed countless times to observe whether the light lines pulled out by the projectile were bent. With slight coordination, each projectile Luan rehearsed hundreds of times. Finally, he mastered the technique of the projectile being fired by a slingshot, igniting it from a distance of 20 meters, accelerating to its maximum speed within 500 meters, and finally stabilizing into a straight line to hit the target.

The final penetration of this projectile fired with a slingshot has a huge penetration power on the bunker, because the kinetic energy of the sniper projectile has to be lost in the air after all. And the sniper warhead warhead will not be able to cause the armor-piercing effect of an iron jujube core covered by an unobstructed film. Such a large projectile is most suitable for striking at medium and large targets (tanks, battleships, houses, bunkers) at a range of five hundred meters to the end of the field of view. As for within five hundred meters, the effectiveness of the projectile is not optimal. With a gun within 500 meters.

Unobstructed superpowers, in general, can only cover a range of one decimeter, but if it is controlled, the control skills are profound. In addition, use your brain and skillfully use the rules of physics. It can inflict extremely terrifying killing effects. In order to complete the control skills within this palm, Lu An spent most of the rehearsals in the rehearsal steps almost every day, and he knew every detail of the projectile by heart.

In the world he lives in now, Lu An is a loach, and in Yuan Yi's mission space, Lu An must be an armor-piercing bullet.

What exactly is Luan, and the key is what Luan wants to do? Life is life, and the battle of mercenaries is work. In the world you live in, you don't have to live so hard. Being an ordinary loach is what Lu Ann wants to live for. And mastering the power of invincibility is the duty of the job.

And the task of space, Lu An couldn't dodge, after bringing enough of his own attack props and survival props, Lu An lay down on the bed and began to enter the Yuanyi space. It's time to do the task.

After entering the Yuanyi space, what caught my eye was the huge hourglass above, and the huge hourglass seemed to be about to leak soon. The last wisps of sand are intermittent. Lu An couldn't help but sigh that time flies so fast.

Walking to the advent platform, Luan took out his prop, a pistol. The black iron block made Lu An quickly substitute for the unique feeling of the task. Lu An opened the light curtain and contacted Li Sanxiang and Bai Lu, and after a while of chatting, Lu An found that Bai Lu had completed his personal task, and Li Sanxiang was ready to enter the mission in four hours.

In the Yuanyi Light Curtain, Li Sanxiang said to Lu An with a worried look: "There is something wrong with the atmosphere in the space now. ”

Lu An looked around during the rehearsal and felt that the atmosphere was a little unusual, and most of the people were in a hurry.

With a minute of rehearsal, Lu An walked to the mission area and found the clue that the price of those popular tasks had increased.

In reality, Lu An responded to Li Sanxiang: "What's the situation? ”

Li Sanxiang said: "I don't know, what's the situation, all the popular tasks have become more sought-after, it is the nobles who have intervened, recruited a large number of potential civilians, entered the command, and provided meritorious point loans." With a lot of money, civilians have been very hot lately in grabbing high-level missions. ”

In the rehearsal, he learned that Lu An, who Li Sanxiang had chosen, was in order to continue the dialogue, and continued to ask: "So what should we do?" Need to take advantage of this opportunity? ”

Li Sanxiang said: "No, don't take advantage of this opportunity, the Nano Group (the organization that bought equipment for Li Sanxiang with a loan of 30,000 # merit points for the three missions of the Mist) asked us to join, and I have already pushed it back, and Bai Lu and I agreed that there is no good thing in the sky that will drop pie in vain." Luan, you'd better use the permission of any task of your choice this time. Don't try to take advantage. This wave of cheap is not so easy to make. ”

Hearing Li Sanxiang's advice, Lu An nodded and reassured: "I will use my authority, don't worry." By the way, what the hell is going on, why did the nobles start recruiting low-level commoners into their command, do you have any news. ”

Li Sanxiang shook his head and said, "I don't understand, I can't find any news." ”

Lu An said, "Then let's wait until I come out." ”

Li Sanxiang stopped Lu An and said, "By the way, this mission, pay more attention, the society here is very complicated." ”

After hanging up the communication, Lu An sighed, and Lu An really didn't know how to reply to a cunning person like Li Sanxiang who told him to pay attention to the complexity of society. Luan walked towards the mission release area. Pillars of light towered here, and Lu An walked towards the crowded pillars of light. A place with a lot of people means that everyone wants to grab it, and everyone wants to grab it, which means that the price is high.

In the mentality of taking advantage, Lu An is ready to use the authority of this free choice of tasks to choose the most expensive.