During this time, Qin Feng has been busy with the Mengshi off-road vehicle, and he can't take care of the development of other projects, and now, the Mengshi car has been tinkered with, and the rest is mainly testing, and then solving the problems exposed in the test.

It's time for him to get busy with other things, such as the fact that he promised self-heating rice and self-heating hot pot, and he didn't bother with it. There are other R&D projects, such as individual exoskeletons and quadruped robots, which are high-tech and can be sold for a lot of money.

Qin Feng heard Zhao Jiao's introduction and nodded: "That's right, it's about to be the New Year, I have to go and see the teachers." ”

The professor is a real person, and he usually doesn't accept gifts from students, but this is a New Year's holiday, which means that he always has to accept it.

Just thinking like this, the phone on the bedside table rang again, with the experience of last time, Qin Feng didn't dare to refuse to answer anymore, he picked it up casually, and an excited voice came from inside.

"Is Mr. Qin here? I'm looking for Mr. Qin, there's something urgent! ”

"Zhu Lao?"

"That's right, it's me, Mr. Qin, are you free tomorrow? If you have time, go to the base of the 1872 tank unit! ”

Tank unit base? Qin Feng was a little curious: "What are you doing?" ”

"You'll find out when you go!"

The last time I went to the tank force base, it was to test the mobility of the T-80 tank, and this time?

Qin Feng's mood suddenly became hot: "Okay, Zhu Lao, I'll drive to pick you up tomorrow!" ”

The tank units stationed in the GDR could be thrown into battle at any time, and this unit was best treated, because it could become cannon fodder at any time.

In order to avoid having time to react, the inside of the tank in their training state is also equipped with ammunition! After all, the reloading of tank ammunition will also take a long time.

In 91, when Silly Damu's army marched south and bulldozed a small country, the army of this small country put up a stubborn resistance, and their tanks rushed up to meet it, but because of the urgency of the situation, they did not have time to reload their ammunition, so they could only shoot with the instructor bullets inside, and the results can be imagined.

Lao Maozi will definitely not make the same mistake, the German blitzkrieg back then, so that Lao Maozi's army on the front line lost a fine light in the early stage of the war, and now, if there is another war, Lao Maozi will let the enemy army on the opposite side be completely finished at the beginning of the war.

So, those two T-80 tanks were also full of ammunition!

After the initial mobility test, it was the turn of the firepower test!

Although the T-72 was originally obtained from Romania, there was ammunition in it, but some were only export ammunition, and the T-80 was ammunition for Lao Maozi's own use! This time, it is just time to test the actual performance of the ammunition used by Lao Maozi himself.

Therefore, the matter of returning to the university can only be postponed for the time being, and since Zhu Lao has sent an invitation, Qin Feng must go and join in the fun.

The next day, the cold wind was still howling, and the whole north was still icy and snowy.

On this day, the 59 tanks of the army did not move, after all, the training is not carried out every day, otherwise the engine life of the 59 tanks of 500 motorized hours would have been almost ruined in a year.

The officers and men of the unit were tidying up their housework and washing their clothes, and it was a rare and clean day.

When the warrior cart drove into the barracks, it still caught their attention, and they poked their heads out from behind the drying racks, revealing a pair of eyes full of surprise.

What kind of car is that?

Tall, mighty, it's just a domineering side leak! Our army will have this kind of car in the future?

The car stopped next to the T-80 tank, and I wish the old man to come down, with emotion on his face: "This car, it's really uncomfortable to sit up, and I can catch up with the tank!" ”

As he spoke, there was the rumbling roar of the engine in his ears, and he actually had ringing in his ears!

Qin Feng smiled: "Zhu Lao, do you regret it?" ”

"It's not regret, it's just a sentiment." Zhu Lao said, looking back.

Originally, there was a bus behind it, with troop leaders and technicians in it, but the bus had long been thrown away without a trace.

"Let's go, let's get on the tank first, check the ammunition inside this tank, and prepare for the next test."

While speaking, Feng Jinxi had already run over: "Zhu Lao, we have prepared the target at the shooting range, put four steel plates ten centimeter thick, and place them vertically at intervals of half a meter, in fact, there is no need to do so much, our old 59's armor-piercing shells have an armor-piercing ability of less than 150 mm, I heard that the tanks of the brother troops have been replaced with 105 mm guns, and the armor-piercing capacity is only more than 200 mm, how much can this 125 mm gun be against the sky, and can it penetrate 400 mm thick armor?" ”

In later generations, when it comes to the penetration of tank guns, many three-media media like to boast about one meter, as if this indicator is easy to achieve.

In the eighties, if you dare to say that you can penetrate a meter deep, it is definitely bragging, even if Qin Feng went to the United States to fool the experts of the M1 tank, he also said that there are 152 mm caliber tank guns, and now there are only many? The thickest one is only 125 mm!

Needless to say, the old 59 line of 100, the NATO standard tank gun L7 imported from the West, its armor-piercing ability is not high, and the original L28 armor-piercing projectile, that is, the American M392A1, can only penetrate a 60-millimeter-thick target placed at an inclination of 60 degrees at a distance of 80 meters.

It is this level of armor-piercing shells imported from the East, of course, Westerners are constantly improving the technology of this tank gun, in the eighties, there are already advanced M833 armor-piercing shells, slender piercing rods, saddle-shaped butts, with classic armor-piercing bullet structural characteristics, performance is also remarkable: it can penetrate 210 mm thick homogeneous armor placed at a 60-degree angle at a distance of two kilometers.

However, this is already the most advanced type of ammunition in the West, and there is no one in the East, as for Lao Maozi, Lao Maozi's tank gun does not look at the caliber, but the actual performance is unsatisfactory, so Feng Jinxi feels that 400 mm is enough.

"Zhu Lao, I don't think it's safe, let's add another piece, if you don't penetrate the fourth piece, that's the best, if you do, there is a fifth piece to carry around, so you don't have to waste ammunition."

Feng Jinxi's eyes widened, five hundred millimeters? Are you kidding!

Zhu Lao pondered for a moment, nodded and said, "Lao Feng, let the soldiers be busy again, and put the fifth homogeneous steel armor target in the back." "When he called, he only said that he was preparing the target, and he didn't say how much, but now that I think about it, 400 millimeters is really not safe.

Feng Jinxi was speechless: "How is it possible, the T-72 tested here last time has an armor-piercing ability of only ......" When he said this, the secrecy discipline suddenly appeared in his mind, and he could only swallow the rest back into his stomach.

"Okay, I'll send someone to do it, Zhu Lao, does this tank still need to be refueled?"

"Yes, we have already transferred a refueling truck from Lu Airlines, so we don't need you."

"Land Airlines? Doesn't this tank burn diesel? Feng Jinxi's heart was afraid for a while, fortunately he didn't help add diesel in advance, if he added diesel, I am afraid it will be a big deal.

"Well, it's aviation kerosene."

Feng Jinxi watched Qin Feng help Zhu Lao and get into the tank to tinker, so he could only leave in shock and arrange for the target to go.

Inside the tank, Zhu Lao looked at the ammunition selection panel in front of him, and had a complicated mood: "Mr. Qin, there are more ammunition to choose from on the weapon selection panel of this T-80, and there is a lot of data that is larger, our previous T-72, the maximum is BM26, but we only got the BM17, we have tested it, the armor-piercing ability is very stretched, the target placed at a 60-degree angle is only 220 mm of penetration, the car in front of us has reached BM42, we are also very curious about its penetration, and we think that 400 mm is enough, Do you think we're underestimating it? ”

"Zhu Lao, this tank is Lao Maozi's most elite tank, and the advanced things they have developed domestically will be equipped, so we can't underestimate it, one more layer, one more insurance. By the way, Zhu Lao, have we taken it apart and studied? ”

Of course Qin Feng can't say it, he knows that the actual penetration depth of this BM42 armor-piercing bullet is as high as 450 mm, which is one of Lao Maozi's strongest armor-piercing bullets at present, right?

Only put four 10 centimeter thick targets, it is definitely not enough, when the time comes to directly penetrate and fly away, then no one knows how deep the actual penetration, this is a waste, waste is a crime!

"Well, we have disassembled a few armor-piercing bullets for study, however, we feel that Lao Maozi's armor-piercing bullet is not advanced, although its piercing rod length has been increased to 574 mm, and the bullet diameter has been reduced to 31 mm, so that the length-diameter ratio has been increased to 14.5, however, it still uses the structure of two shells, wrapped in steel in the middle, I don't understand why Lao Maozi likes to make armor-piercing bullets in two so much."

"Maybe it's because they can't make one?" Qin Feng said.

The core of the armor-piercing bullet is the piercing rod, this slender piercing rod is like a shuttle dart, used to pierce the enemy's armor, naturally the harder the better, Lao Maozi likes to use tungsten alloy, Americans like to use depleted uranium, this is of course because the world's main tungsten ore is concentrated in the Soviet Union and the East, the Americans use depleted uranium, can save valuable tungsten ore, however, although Lao Maozi has no shortage of tungsten ore at hand, there is no advanced smelting technology.

When Germany has used advanced liquid phase sintering technology to create a one-piece threading rod, Lao Maozi still uses tungsten carbide, which is an old-fashioned technology that has been used for decades, under this technology, the slender threading rod is easy to break, so it is simply used in two, and the middle is reinforced with a steel sleeve.

However, the exported BM17 is obviously a steel core bullet, but it is still cut out in two, so I don't know what it means, it can only show that Lao Maozi is used to nature.

In the past, the T-72 at hand was a foreign trade product, and the armor-piercing shells in it were also foreign trade, but this time I finally came into contact with the armor-piercing bullets used by Lao Maozi for his own use, which is still the most advanced!

The rod looks fine, but the stock is still a problem.

In the past, armor-piercing shells had the same thickness as the barrel, so that the warhead would be very heavy, and the armor-piercing ability was not strong, as was the case with armor-piercing shells on the 59 tank.

If you want to pierce through the armor, the slender rod-like structure is more suitable, but in this way, the warhead cannot be in close contact with the gun chamber, and it cannot encapsulate the energy of the propellant, which requires something called the butt, which clamps the slender rod in the center, and at the same time seals the gas behind, jumps forward with the rod, and then separates from the rod after leaving the barrel, so that the rod flies to the target by itself and completes the mission.

In the past, the butt was a disc with a hole in the middle to accommodate the rod, and the outer diameter was the same as the inner diameter of the barrel.

However, the rod is elongated, and the disc has only one fulcrum, which is like a person picking a flat shoulder, which is easy to swing back and forth back and forth, and the butt of this way will cause the rod to flutter when it comes out of the muzzle, reducing the accuracy of shooting, and at the same time, if it is not well controlled, the tail of the rod may also contact with the inner chamber of the barrel and scratch the barrel.

Therefore, the disc stock has long been outdated, and the West quickly came up with a saddle stock.

Of course, the cross-section of this butt is still round, after all, it is necessary to seal the gas inside the breech, but if you cut this butt in half in the direction of the piercing rod, it becomes the shape of a saddle, which wraps the piercing rod, and the contact part has a length of tens of centimeters, firmly fixing the butt, so this saddle-shaped butt quickly became the mainstream.

However, this elastic stock needs advanced CNC machine tools to process in order to ensure accuracy, Lao Maozi does not have this technology for the time being, and the process is complex, and it is inconvenient to produce in large quantities.

Lao Maozi can't make an integrated piercing rod, nor can he make an integrated butt, so ...... The performance of their tank guns, even if they are for their own use, is not much higher.

At this moment, a familiar laughter came from outside: "It's better to come early than to come by chance, come back for a few days, our Lao Li can still join in this excitement, it's not easy, it's not easy!" ”

Li Runzhu was about to go back to the south, but before leaving, he heard that there was going to be a test here, so he immediately ran over, and at this time, looking at the warrior off-road vehicle parked next to him, he was a little dissatisfied: "Mr. Qin, you are not authentic, why don't you drive to pick me up?" ”

Qin Feng showed his head: "Leader Li, I didn't know you were coming." If you want to sit, I'll drive you around the range now, and I'll take you around the range? ”

"Forget it, don't make an obstacle to the test, if you are targeted, there is no place to reason. Everyone is here, and the test begins, right? ”

The buses came, the refueling trucks came, and the big guys were busy for more than ten minutes, the tank's engine rumbled, and the tank left its position and headed for the firing position.

If you want to test the fire control of the tank, then you must fire on the move, but now the test is the firepower of the tank, so it is most certain to fire at a fixed firing position, knowing all the shooting elements, otherwise if it misses the target, it will not be a waste of shells.

The shells of tank guns are very expensive, and the tungsten alloy armor-piercing shells made by advanced liquid-phase sintering technology are more than 10,000 yuan, and they are all money!

"Attention, the first test begins, 3VBM17!"

Wait, isn't BM17 Lao Maozi's monkey version of the steel core two-piece bomb for export?

It's easy to confuse people here, you know, in the 21st century, Ah San can produce 3vbm17 by himself, and he also focused on publicizing this matter, and the pride is overflowing, is this armor-piercing bullet the kind of monkey version in the hands of stupid Damu?

Of course not, there are more 3V words in front.

Lao Maozi's armor-piercing bullet naming has its own set of rules, with 3V, which refers to the model of the entire armor-piercing bullet, without these two words, it refers to the piercing rod inside.

Therefore, this state-of-the-art armor-piercing projectile, with the overall designation 3VBM17, uses a BM42 piercing rod on its warhead.

Inside the tank, the automatic loader made a few soft sounds, boom, whoosh!

Autoload complete!

Trajectory correction completed!

Rumble!

As the gun commander stepped on the firing device, a ball of flame suddenly appeared from the muzzle, and a rod-piercing rod with a disc-shaped butt appeared in front of the flame, and in the next second, under the impact of the huge air current, the butt was divided into three pieces and flew away, and the rod continued to fly forward!

The muzzle velocity of the armor-piercing projectile is as high as about 1,500 meters per second, and it only takes more than a second to fly over a distance of two thousand meters.

The tungsten alloy bullet core collided with the target, friction, and huge heat was rapidly generated, and in the next second, a flame came out of the target, as if a fire was burning on the steel plate, followed by the second, third, and fourth pieces......

In fact, to test the depth of the target, you can use a whole piece of homogeneous steel, and then cut it after the shot, you can know the actual depth, but that has to be cut, if you want to see the depth of the target intuitively, and it is more spectacular, that is, the steel plates of equal thickness are arranged in turn, and the flame that blooms out of the rod is connected together in the process of penetrating again and again, which is very spectacular, and the depth data can be seen directly.

Wait a minute! What about the fifth?

According to Lao Maozi, this mango bullet has a penetration depth of 450 mm! Now only four ten-centimeter-thick steel plates are intended, and no flames rise from the fifth!

Seeing the flames pass by, Qin Feng was very curious, and then looked to the side: "Leader Li, show me your telescope?" ”

"What to see, what to see." Li Runzhu said as he continued to look with a telescope: "Hey, it seems that the rod is clamped on the fourth steel plate?" ”

"Report! The piercing rod was stuck on the fourth steel plate, and the first live firing was carried out, piercing to a depth of four hundred millimeters! ”

A smile appeared on Feng Jinxi's face: "Mr. Qin, I'll just say that four pieces are enough." This fifth piece is not necessary, Lao Maozi's tank is like that, how can it have a penetration depth of 500 mm? ”

"When we place it like this, it's equivalent to air-gap armor." Zhu Lao spoke: "If it is stacked together, the piercing rod should be able to pass through the fourth piece of armor and continue to fly forward, but it should not fly far, and the accurate vertical penetration depth of this armor-piercing projectile should be about 420 mm." ”

To measure the armor-piercing ability of an armor-piercing projectile, the most suitable target is placed at an angle of 60 degrees, but in that case, a ricochet may occur, so in order to reduce the loss of shells, the current test method is used.

However, Lao Maozi's data is also watery! Qin Feng sighed in his heart, could it be that the steel used by Lao Maozi's target is worse?

"This is already Lao Maozi's most advanced armor-piercing bullet, right? In other words, as long as the protection of our third-generation tanks is 450 mm, their tank guns will not be able to penetrate it! Li Runzhu said: "We originally thought that Lao Maozi's strength was strong, but after a long time, it was nothing more than that!" ”

Li Runzhu's eyes showed disdain.

"Next test subject, 3VBM13!" Zhu Lao took the radio and continued to give orders.