Shuangqing University, No. 1 Doctoral Dormitory Building, 501 Dormitory.

In terms of noise control of the shadow dragon, Shi Lei was very satisfied. In order to test the control flexibility of the shadow dragon, Shi Lei directly used the small environment of the 501 dormitory to test it in Shi Lei.

Controlling the U-shaped joystick, the shadow dragon moves flexibly in the small space of the bedroom. The handling performance is excellent, especially when it comes to changing directions.

Due to the fact that the bottom of the cabin of the Shadow Dragon is taken by three cameras to monitor the scene in real time, plus the Shadow Dragon is a four-propeller symmetrical design.

When changing directions, you don't need to turn at all, you can go forward, or go backwards, or any other direction. This is a clear advantage over the Steel.

The good handling performance allows the shadow dragon to move freely in a small space, as if it is not restricted at all.

Slowly descending the shadow dragon, Shi Lei nodded with satisfaction, the shadow dragon already had two advantages. Whether it is flexible handling performance or noise control, it is very suitable for complex urban environments.

In particular, the flexible operation performance will make the Shadow Dragon comfortable in urban environments.

"Little Lizi, how is the defense of the Shadow Dragon?" Shi Lei asked with a sense of concern.

Whether it's a propeller blade that looks a little thin, or a live-action capture camera that is exposed to the outside. None of them look like anything with high defense.

Li Chai's next words confirmed this!

"Brother Shi, the defense of the Shadow Dragon, there is no way to compare with the Iron Number! After all, the Steel is made of special aviation metals, while the Shadow Dragon is only made of aluminum alloy. Whether it's a pistol, a miniature submachine gun, or even a high-altitude projectile, it has the potential to inflict fatal damage on the Shadow Dragon. Li Chai said with some embarrassment.

But Li Chai immediately continued to speak: "Brother Shi, although the shadow dragon's defense is not good. But it's much less expensive than the Steel! The Shadow Dragon, which is not equipped with a weapon module, costs only a little more than 10,000 yuan! And most of the cost is concentrated in the on-board computer, high-efficiency lithium batteries, as well as ranging radars and cameras. These parts can be recycled over and over again. ”

Shi Lei nodded helplessly, after all, the cost is only one-tenth, and Shi Lei is not surprised by this answer. Because how to look at the shadow dragon, how is it not like a high-defense body.

The positioning of the shadow dragon is more to carry out tasks in the urban environment, and the security issues in the city, most criminals, will not have firearms. Therefore, it cannot be harmful to the Shadow Dragon!

Inside a small CNC machining center. The barrel of the electromagnetic cannon was finally processed, Li Chai opened the hatch of the small CNC machining center, took off the barrel on the tooling, and smiled strangely, rubbing the silver-white metal tube of about ten centimeters.

Shi Lei felt a chill in his heart. Xiao Lizi's movements are too obscene, as if she is masturbating

"Little plums. You guy, pay attention to the image! Shi Lei couldn't help but remind.

Li guessed and smiled. "Brother Shi, don't underestimate this cannon barrel, although it is only 10cm long, its price is two thousand yuan!"

"So expensive?" Shi Lei looked at the unsightly short tube, and didn't understand why its price was so expensive.

Li Chai explained: "Brother Shi, this is a special metal. It can better adapt to the electromagnetic effect, so that the shell can reach a higher initial velocity! The special diamond drill bit that processed it alone also cost 20,000 yuan! It's a bit expensive, but it should work pretty well! ”

"Try it?" Shi Lei said with some expectation.

"I'll assemble it first!" Li Chai is holding a 10cm electromagnetic cannon barrel. Go to the workbench and lock the barrel into the mechanism.

That mechanism is the core device of the electromagnetic gun, the accelerator and the switch. There are three main parts of the electromagnetic gun, the energy device, the accelerator and the switch.

In terms of energy, it was provided by Shadow Dragon, and Li Chai designed the accelerator and switch in the same part. The switch part should also be connected to the shadow dragon and handed over to the shadow dragon for automatic control.

After the barrel was installed, Li Chai took out a bag of steel balls and loaded them into the ammunition supply system of the electromagnetic gun. The miniature electromagnetic cannon designed by Li Chai uses a cannonball that weighs 5 grams of solid steel balls.

While Li Chai was installing, he introduced the basic parameters of the miniature electromagnetic gun to Shi Lei. "Brother Shi, with the energy situation of the Shadow Dragon, it can only support a maximum of 50 shots. And every time the cannon is fired, it takes about 1 minute of power to stay in the air. ”

Shi Lei's eyebrows were squeezed together, and one shot consumed 1 minute of time in the air, which was really a luxury electromagnetic cannon!

"How's it powering?"

Li Chai found a piece of scratch paper on the workbench, handed it to Shi Lei, and said, "The calculated data shows that the power is considerable. A solid steel ball weighing 5 grams, the initial velocity reaches the level of 800 meters! ”

Shi Lei didn't know the meaning of these data, and said directly: "Xiao Lizi, you give me a distance explanation, what is the power of the miniature electromagnetic cannon!" ”

As the so-called art industry has a specialty, Shi Lei is a super cow in the computer industry, but in the machinery industry, he has become a rookie.

Although Li Chai doesn't know the knowledge of computers, he understands what Shi Lei doesn't understand.

"Brother Shi, according to the formula for calculating kinetic energy, E = 1/2MV2, that is, kinetic energy is equal to half of the mass multiplied by the square of velocity. The speed of the miniature electromagnetic gun is 800 m/s, the weight of the solid projectile is 0.005kg, and the kinetic energy is 1600 joules. That's a remarkable number! After Li Chai finished explaining, he found that Shi Lei was still in a confused state, obviously explaining in vain!

Shi Lei coughed: "Let's just say it, it's as powerful as something!" ”

Li Chai thought for a moment before giving an example: "Brother Shi, do you know the M4 carbine?" ”

In his previous life, the M4 carbine was Shi Lei's favorite, and it was very good in terms of shooting speed, accuracy, and range.

"Well, I know the way!" Shi Lei nodded, and said in surprise: "Could it be that the power is about the same as that of the M4 carbine?" ”

Li Chai nodded, "That's right!" The M4 carbine has a muzzle velocity of 880 M/s, a muzzle kinetic energy of 1645 joules, and a bullet weighing slightly less than 5 grams. Our miniature electromagnetic cannon is almost the same as a carbine in terms of kinetic energy, that is, almost the same in power! ”

Shi Lei listened to Li Chai and realized his previous mistake in thinking about the power of the electromagnetic cannon, it turned out that the power could not only look at the speed. It also depends on the mass of the projectile, and the kinetic energy that will eventually be combined.

Kinetic energy is energy!

The higher the energy, the greater the destructive power and the higher the power!

Another example of the power of the miniature electromagnetic cannon is the famous Blackstar 54 pistol, which has a muzzle kinetic energy of only 480 joules.

After almost understanding the power of the miniature electromagnetic cannon, Shi Lei finally smiled. But Shi Lei had another doubt, although he didn't know much about physics, and he didn't know much about the conversion between energy, but Shi Lei still knew how to use a kilowatt-hour of electricity. That is, one kilowatt-hour of electricity, which is equal to many, many joules.

Why does a single electromagnetic cannon consume a minute of Shadow Dragon's battery life?

Shi Lei asked about his doubts, and Li Chai took out more detailed parameter drawings and explained them to Shi Lei.

According to the conversion of energy. One kilowatt-hour, or one kilowatt-hour of electricity, is equal to 3.6 million joules.

Shadow Dragon uses distributed battery energy supply. A total of five batteries were installed. They are the four frames of the propeller, as well as the main battery compartment of the engine room. The total capacity of the five electromagnetic blocks has reached the level of 2.2 kWh.

The power of each of the four propellers is 300W, and the four propellers add up to 1.2kW, which consumes 1.2 kWh of electricity in an hour.

The Shadow Dragon also has an on-board computer. Ranging radars, surveillance cameras, these also consume power, adding up to almost 500W. That is, 0.5 kWh of power per hour.

The total power consumed by the Shadow Dragon in an hour is 1.7 kWh, and there is still 0.5 kWh left in the total power, which can support more than ten minutes of flight time.

The maximum flight time is 80 minutes, which is still quite an ideal situation!

A electromagnetic cannon only has an energy of 1600 joules, and for a shadow dragon with an energy of nearly 8 million joules, what does it take to reduce the range by about 1 minute for a single launch?

Approximately 8 million joules of energy divided by total time, divided by approximately 80 minutes of journey time, consumes approximately 100,000 joules per minute.

100,000 joules and 1,600 joules, is the difference a little too big?

In fact, due to the limitations of the process, the material and the architecture of the miniaturized electromagnetic gun, the efficiency of the conversion of energy by the Lorentz force and the electromagnetic effect is very low!

With a conversion rate of just 1.6%, it's no surprise!

After listening to Li Chai's explanation, Shi Lei coughed and asked: "Little Lizi, in a word, there is still a lot of room for improvement in the future of miniature electromagnetic guns?" ”

"Yes! So to speak! With the improvement of the technology and craftsmanship we have mastered, there are better material inputs, as well as more advanced frameworks. Our electromagnetic cannon will eventually become more and more powerful! Li Chai spoke confidently.

Shi Lei clapped his hands and said, "I'm relieved!" Xiao Lizi, install this electromagnetic cannon first, and I'm going to test it myself to see how powerful it is! ”

The process of installing the electromagnetic cannon is very fast, whether it is an electromagnetic gun, or an MP7 miniature submachine gun, all of which have a modular design.

As long as it is standard modular, it only needs to be loaded accordingly, and it can be completed in a few minutes!

It took Li Chai seven or eight minutes to install the electromagnetic cannon and the shadow dragon together, and checked it again, and after confirming that there was no problem, he said to Shi Lei: "Brother Shi, no problem!" ”

Shi Lei checked the power information fed back by the ECH system, and there was still 76% of the battery, which could last for more than 50 minutes.

With the rise of the shadow dragon, Shi Lei controlled the shadow dragon to fly out of the living room and fly to the world outside.

Li Chai said nervously: "Brother Shi, the power of the electromagnetic cannon is very great, what are you going to test its power with?" ”.

(To be continued.) )

PS: Calculating these data, Makuyama almost collapsed, lost mathematics, physics and chemistry for many years, and begged to subscribe to "Hackers" to charge Makuyama's positive energy! Come on! Are there also monthly passes and tips? 【Reward thanks】The last betta fish, reward 1888.Snow lotus fragrance in the dark night, flying eagle soaring in the sky, reward 200.Foggy cave flail, friend 0402, Jiashi beautiful eyes, reward 100