"Shocking secret! What's the secret? I glared at this friend who had no "conscience", and I felt so sorry for him.

Yun Hao finally came back to his senses when he saw me like this, and said with a slightly restrained smile: "The attack mecha doesn't necessarily have to break the shield, we just need to find a way to let it pass through the shield." ”

"What do you mean?" I replied, found a chair and sat down, leaned back, and asked.

Yun Hao also took a chair and sat opposite me, and said proudly with a smile: "Actually, we have all fallen into a misunderstanding, since the mecha set up the shield, I think that the attack mecha has to break the shield. But sometimes the shield can't protect against physical attacks, and I'm thinking about using physical attacks now, and you still remember how the rebels dealt with Thor last time at a distance! ”

I tried to think about it for a while, nodded and said, "But that's different, the rebels use low-speed small robots, which don't respond to low-speed object shields, but the speed of the machine gun is quite high, and the kinetic energy carried by the high-speed warhead is also quite high!" The shield doesn't respond to it? ”

Yun Hao heard me say this, his brows raised slightly, and he showed a strange smile: "This is the shocking secret I just said. In general, we think that the shield does not respond to objects traveling at speeds below 100 km/h, and that the shield will work at speeds above that. But I've now figured out that this isn't entirely true, and shields are ineffective against some small high-velocity objects. I did the math, and this law can be called the energy surface product, which can be calculated with a simple approximate formula. Energy surface product (N) = 1/2mv2*S, where the unit of S is cm2, m is kilogram, and V is m/s, this formula is only applicable to objects with a cross-sectional area of less than 1.3cm2. After experimenting, I found that there is no reflection on the shield of objects with an energy surface area of less than 108,000N, more than 68,000N, and a cross-sectional area of less than 1.3Cm2 and a velocity of 1500~2800 meters per second. At this time, the bullet can ignore the protection of the shield and hit the mecha directly, if any of the above conditions are not met, the shield will work to block the bullet. The area of 88000~108000N can be said to be the death zone of the mecha. ”

"What!" I couldn't help but shout out that the problem of breaking the shield for thousands of years could be so easily discovered, and I was fascinated by this novel discovery, and at the same time I wondered. My mind was thinking sharply, although Yun Hao seemed to have a lot of sense, but I always felt that something was wrong. I pondered for a while, and finally came to the point.

"So what is the current bullet caliber? How fast can it go? Even if a bullet passes through the shield, how much damage can a single hit inflict on the mech? ”

As soon as I said this, Yun Hao gradually withdrew his smile, stood up and shrugged his shoulders, sighed and said: "I also have a headache for this matter now, the caliber of this warhead is tentatively set at 12.7mm, the speed is about 1800 meters per second, and the weight of the warhead is about 46 grams." If you hit, it depends on the part, its armor-piercing ability is about 1.2cm at a distance of 1.5 kilometers, and the surface metal plate of some particularly thick parts of the mecha is still impenetrable. However, the metal plate on the surface of the general mecha can be penetrated, and after penetration, it can cause some damage to the internal components of the mecha, causing the mecha to malfunction and lose its combat effectiveness. I counted it, and it generally takes about 10 rounds to hit an ordinary mecha to be effective, but fortunately, this gun has a fast rate of fire, so a six-barreled machine gun is used to ensure the rate of fire. ”

I nodded and thought of another question: "Then the rate of fire of this gun should be."

It should be higher, his ammunition feeding system should be a little more complicated than the laser gun! ”

At this time, Yun Hao seemed to expect me to say this, and said: "I refer to the ancient heat supply system. The design of the weapon is not large. Actually it's also hot. Advantages of Weapon Mode. Heat powered by explosives explosions. Weapons and firearms do not need to require relatively complex energy supply devices like optical or electromagnetic weapons and firearms, and if it is a high-speed laser gun, its energy supply device is very large and occupies a large volume. If there is only a simple supply device, it is simply not enough to ensure the need for a high rate of fire laser gun. And one of my current guiding ideas is to minimize the volume of the mecha to reduce the area of the bullet, and to minimize unnecessary energy supply devices, so as to save costs, and more importantly, to improve the production speed, for mass production mechas, speed and cost are also very important! ”

"Can this be any faster? You must know that the laser gun is the speed of light, and it basically does not take time from launch to hit. "I silently calculated in my heart and found that even according to what Yun Hao said, the energy surface area of this warhead has not reached the upper limit.

Yun Hao looked at me, paused and continued: "It can't be higher, now the speed of the bullet is basically the upper limit of 1800 meters per second, if the speed goes up again, the weight of the 12.7mm warhead is not enough, the capacity is unstable, and the N value of the second ammunition may exceed the upper limit of the shield." In addition, the speed of 1800 meters per second is relatively easy to achieve with conventional gunpowder. ”

I nodded and realized a little: "You are very thoughtful, and you need to leave some room for speed." Everything else seems to be pretty good, but the speed of the bullet still feels a little slower, which is fine at close range, and the hit rate will be much lower for long-distance moving targets. ”

"Yes, but there is no better solution for the time being, and if it is higher, the surface product will be exceeded."

I couldn't sit still, so I stood up again and turned to the largest mech, while Sihan was still watching the mecha build intently, as if he hadn't heard our conversation.

I glanced at Sihan, then turned my head to Yun Hao and said, "It's right that you want to strengthen the firepower of the mecha, but such a quantum cannon is mounted on a small mecha, and its energy is enough for it to shoot a few shots?" ”

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"You're right, I've thought about it." Yun Hao nodded, touched the quantum cannon and said, "This cannon is actually still a model, I initially considered adjusting the power of the quantum cannon to maintain its maximum power, but reduce its minimum power, so that the energy consumption will be a little less." ”

"I understand how to keep the maximum power, but what is the reason for reducing the minimum power?" I really don't understand Yun Hao's novel ideas.

"The object is different, of course the energy is different, I think that the quantum cannon can be used to fight ordinary mechas, and ordinary mechas naturally can't use such high energy."

"Fighting mechas, this is good, as long as the calculation is accurate and does not waste energy, no one stipulates that the quantum cannon can only be used against large mechas, not ordinary mechas. The quantum cannon against an ordinary mecha must be a shot, and it is really a good idea. ”

I appreciated it, thought about it, scratched my chin, and asked, "Then how do you plan to combine these three mechas, ordinary mechs are six-barreled machine guns?" It feels like firepower is still a weakness. This six-barreled machine gun looks very powerful, but the ammunition consumption is also large, this kind of rotary tube machine gun should be fed with a bullet chain in ancient times, and the bullet chain feed is still a bit of a space, I estimate that the ammunition of your mecha can only be loaded with a few hundred rounds! Let's see if you can improve the machine gun and reduce it as much as possible while maintaining its power

It may be better to reduce the volume and simplify the ammunition feeding device. ”

Yun Hao scratched his hair and said, "The preliminary consideration is to form a seven-machine squad, four ordinary small mechas, two high-firepower mechas, and one large long-range support mecha. I thought that I might have to add a radiation gun to the small mecha, but in this way, the size would increase a lot, which was contrary to my original intention of reducing the size of the mecha. ”

Yun Hao paused for a moment and then said: "The six-barreled machine gun's resolver ammunition supply is a bit complicated, and the bullet chain can only feed about 300 rounds, just like you said, any more will take up too much volume." ”

After Yun Hao finished speaking, he took something out of his pocket and threw it over, I took it and saw that it was a bullet. The caliber of this bullet should be the 12.7mm machine gun bullet for the six-barreled machine gun, it has a long cartridge case, about 13 centimeters, it is quite long, and it still takes up space with the bullet chain.

"Can you make the bullet smaller without sacrificing power?" I asked, aiming at the huge bullet. Actually this heat. The volume of the warhead of the ammunition we want it to do is not too large, and the shell case at the back is too large.

"I also want to make it smaller, but if the warhead is too small, even if the speed is increased, the energy will not decrease. But there is a problem that if the warhead is smaller, its weight will also be smaller, and if the warhead is too light to attack long-distance targets, it will be unstable, and the dispersion of the impact point will be relatively large, which means that its accuracy will decrease. I have also decided on the current warhead size after repeatedly considering various factors, and if you have a way to make the warhead small and not unstable, you must tell me. ”

I grimaced, I only knew about this ancient weapon, I didn't know much about it at all, I couldn't solve this problem of Yun Hao. At this time, he saw Sihan's eyes suddenly flash, as if he had thought of something, but the little guy immediately continued to watch the manufacture of the mecha.

I circled around the three mechs, knocking on this, patting that. Yun Hao also followed me around, obviously he also knew that his design was still flawed, and hoped to get some suggestions for improvement from me. I touched the barrel of the ordinary mecha, turned my head to look at Yun Hao, and said solemnly: "If you don't solve the problem of ammunition carrying, your mecha is equal to scrap metal, and ammunition on the battlefield is often used to suppress the opponent, and the amount of 300 rounds is too small at a time." ”

Yun Hao grinned, sighed and said, "Okay! I'll figure it out. Do you have any suggestions for other areas? ”

"The firepower of the high-firepower mecha is not something other than the quantum cannon, if you want to use it as long-range support, it should have a small high-speed missile. I think there are too many direct shots and too few curved shots in the Age of Light. Warp attacks can sometimes be useful on the battlefield. ”

"Yes! Although the direct aim shot has a high hit rate, it also exposes itself head-on. The current mecha design is really a mecha as a machine. I agree with one thing about your idea, if you treat the mecha like a team member, you will invisibly increase your combat effectiveness. I must design a reasonable mecha team to maximize the effectiveness of various weapons on various mechas, so that the mecha battle damage rate can reach a minimum. ”

Yun Hao and I discussed a lot, and the two of us had a lot of common views, thanks to the Red Flame Star Expedition that we had experienced together. Only war will discover the flaws of weapons, and only war will make you have the urgent desire to improve weapons, and in peacetime, weapons from hundreds of years ago you may think are quite applicable.