In 1978, I was admitted to Harbin Institute of Technology

Chapter 194: If the accuracy is not enough, then the rocket launcher will be equipped with a nuclear bomb? Xie Rou's martial virtue is too abundant

Xie Rou held her head high, chin raised, and looked at Xie Wei with displeasure.

Only then did Xie Wei realize that Xie Rou had grown a lot taller in the past six months. She was originally only at his shoulder level, but before he knew it, her height had reached his forehead.

I'm afraid this girl will grow to be over 170cm tall, taller than me.

Xie Rou is only 14 years old now!

With this height, he is not considered short even in the Northeast, let alone in Bashu.

Perhaps because she had been eating well during this period and her energy consumption was not as great as before, Xie Rou's complexion became much rosier and she was no longer as tired and haggard as before.

Xie Wei was puzzled. Didn't he just say that it hadn't gone through the telemetry test process? Why did this girl react so strongly?

"It's cold outside, let's go to the workshop and talk."

Fang Pengju hurriedly invited Xie Wei into the workshop. "Xie Rou's simulation calculations found many problems, and they were all improved one by one. At present, the entire rocket launch system, theoretically speaking, has no problems... That's why we will go to the national shooting range for a more complete test this time."

Through Fang Pengju's explanation, Xie Wei finally understood why Xie Rou reacted so strongly:

This girl felt that she didn't trust her computer simulation.

Following Fang Pengju into the workshop, the tank prototype that was originally placed in the middle was moved to the corner, where a relatively large military green launch vehicle was parked.

Behind the launch vehicle are two sets of 2×2 launch boxes.

Unlike the Type 83 273mm long-range rocket, which uses the Type 60-1 medium tracked tractor as its chassis, it uses a wheeled chassis.

"This chassis?"

Xie Wei asked, pointing at the wheeled chassis.

The domestic industrial base is poor. Although it can produce heavy-duty trucks, the development of chassis for special vehicles has been very slow.

"The 50-ton 6×4 semi-trailer tracked tractor developed by Hanyang Special Automobile Factory just last year. The engine has 320 horsepower, excellent off-road capability, and strong ability to escape from difficulties..."

"Hanyang Special Vehicle Factory?"

Xie Wei knew that Hanyang manufactured rifles, but he didn't know that Hanyang could also manufacture cars.

Xie Wei had never heard that Hanyang could manufacture special military vehicles.

In his impression, China's automobile industry is backward these days, especially special vehicles are in short supply, and it is impossible to find a chassis with excellent performance.

But think about it, if there was no manufacturing capability, where would the special vehicles needed for the various missiles in the 84 military parade come from?
"Yes, Hanyang Special Vehicle Manufacturing Plant. In the 60s, we completed the trial production of torpedo transport vehicles, and later developed special vehicles such as missile transport vehicles and pontoon bridge vehicles. In the 70s, the contradiction between the lack of heavy vehicles and the shortage of light vehicles in the national automobile industry became increasingly prominent. In 72, Hanyang Plant successfully developed a 4×2 25-ton heavy-duty tractor semi-trailer. Last year, it developed a 6×4 50-ton heavy-duty semi-trailer tractor, which is what you see here."

"The vehicle is 11.2 meters long, 3 meters high, and 34 meters wide. The full weight in marching state is 2.4 kilograms, and the full weight in combat state is 15134 kilograms..."

Pointing at the launch vehicle in front of him, Fang Pengju introduced the situation of the Hanyang Special Vehicle Manufacturing Plant to Xie Wei, and then began to introduce the launch vehicle in front of him.

As soon as he said some data, Xie Wei felt something was wrong.

He hurriedly stopped her: "Wait, Director Fang, why is there such a big difference in weight between the combat state and the marching state? Can't we march while loading ammunition?"

The weight difference between marching state and combat state is 8 tons!

Do we need to separate the rocket from the launch system?

Wait until combat time to load the rockets?
No modular design?
If we wait until just before launch to load, won't the launch preparation process take a long time?
"Didn't you say you would run after firing? This is the weight of the rocket after firing. One rocket weighs 860 kilograms. Do the math yourself!"

Just when Fang Pengju didn't know how to answer, Xie Rou rolled her eyes and spoke to Xie Wei in a bad mood.

Xie Wei was extremely embarrassed.

I haven't really thought about this question.

"Director Fang, please continue."

Not wanting to argue with Xie Rou, Xie Wei decisively asked Fang Pengju to continue the introduction.

"The rocket has a caliber of 302 mm, a length of 7672 mm, a weight of 860 kg, a warhead weight of 140 kg, and a composite solid rocket propellant made of sodium borohydride plus aluminum, magnesium, and beryllium powder. The maximum terminal speed can reach 700 meters/second..."

The caliber of 302mm barely reaches the threshold of China's rocket launchers.

With a caliber of this size, if you want a longer range, you just need to increase the caliber and lengthen the projectile.

Iraq learned the essence of how to increase the range: combining three missiles into two, doubling the range.

They haven't increased the caliber yet.

“高低射界为+5°~+56°；左右射界为±18°。为了装卸方便，发射系统按照你之前的提议使用两组2×2发射箱，一共8枚，从行军状态到完成发射准备需要4分钟时间，模块化换装让再次装填可以在10分钟内完成。”

At this point, Fang Pengju's face was still full of disappointment, "Compared to the 122 and 130 rocket launchers, the reloading time is still a bit insufficient."

"..."

Xie Wei was surprised to hear this.

It only takes 4 minutes from high-speed marching state to completing launch preparations.

Besides, it would only take 10 minutes to launch another salvo!

not enough?
Could it be that Professor Fang hopes that the troops equipped with this type of rocket launcher will directly launch a few rounds of covering fire like ordinary heavy artillery?
Professor Fang’s martial virtues are simply too abundant!
"The biggest advantage of the modular design is that each launch box can be disassembled independently... The ammunition supply vehicle following behind can transport 16 rockets at a time. In a state of war, you only need to hoist the launch box together with the rockets onto the launch vehicle..."

Fang Pengju and others have now realized the benefits of modular design.

After firing the rocket, it is directly lifted up using the lifting equipment on the supply vehicle, saving the trouble of reloading ordinary rocket launchers one by one after firing.

Greater mobility.

"That's really good. With such a range, it will be difficult for the enemy to find the artillery positions in the rear in a short period of time. After a round of salvos, they will just run away. If the first round does not achieve the desired effect, we can move to another place to reload and continue firing..."

After listening to it, Xie Wei felt that it was similar to China's rocket launchers decades later.

What needs to be improved later is the range, accuracy, and the development of other types of warheads.

"The rockets haven't been loaded yet, have they?"

Xie Wei asked.

"The school does not have the conditions to produce rockets, so we have handed them over to other factories for production. When the time comes, the rockets will be transported directly to the shooting range... We will go there, test them, and then work with the manufacturer to improve them."

Fang Pengju's words made Xie Wei feel relieved.

The 860kg rocket has a 140kg warhead which is high explosive, and the solid fuel at the back is also high explosive.

A launch system, loaded with at least 5000 kilograms of high explosives, really exploded...

"From the time of assembly to now, the entire design has been modified more than a hundred times: the front end of the engine was changed to an engine with an oblique nozzle; the four cross-shaped tail fins at the end were modified to have a 4° angle and were mounted on the main engine with a ball bearing, allowing them to rotate freely, allowing the rocket to spin at a low speed during flight, using the spin plus the tail fins to stabilize the trajectory and ensure strike accuracy..."

The modifications were made after Xie Rou discovered problems through simulation calculations, and Fang Pengju led the team to make modifications based on the problems.

After the modification, calculations continued using the model provided by Xie Rou.

The modification speed is very fast.

The main purpose is to ensure strike accuracy and range.

For a rocket launcher with a range of 120 kilometers, the rocket launcher launching position cannot see the target situation or the effect of the strike. It can only arrange scouts to guide around the target area and observe the results of the strike.

"What is the theoretical accuracy of our rocket launcher?"

Xie Wei was very curious about the shooting accuracy of this long-range rocket launcher after Xie Rou simulated the trajectory and dispersion range and made some modifications.

"Alas, it is still far from the expected range. Theoretically, at the maximum range of 120 kilometers, the vertical dispersion is no more than 1/200, and the horizontal dispersion is no more than 1/270. Alas, if inertial guidance is added, the cost of the entire rocket will be too high."

The disappointment on Fang Pengju's face turned into melancholy.

In his opinion, the accuracy of this long-range rocket launcher is still too poor.

Xie Wei quickly calculated the accuracy in his mind. When he got the result, he looked at Fang Pengju with a twitching mouth, "Director Fang, this is a rocket launcher that relies on saturation strike and range killing to generate its power, not a missile!"

According to the description in "Introduction to Ammunition", artillery shooting accuracy and artillery density are both contradictory and mutually influential.

Accuracy refers to the distance between the impact point and the target position; density refers to the deviation of the landing points of several shells at the same elevation angle relative to the average impact point.

Rocket launchers mainly achieve saturation strikes by rapidly launching a large number of rockets in a short period of time to cover a large area of ​​the target area, and therefore focus more on density rather than accuracy.

Longitudinal dispersion refers to the error of the impact point from the target position at the range. If the longitudinal dispersion is no more than 1/200, it means that at a range of 120 kilometers, the impact point has an error of ±600 meters from the front and rear position of the target point.

Horizontal dispersion refers to the directional error, which is also 120 kilometers. The error of the impact point to the left and right of the target is ±400 meters.

This means that at a range of 120 kilometers, the rocket will fall within an elliptical area with the theoretical landing point as the center, a major axis of 1200 meters, and a minor axis of 800 meters.

Any location within 1.5 square kilometers may be the landing point.

"Heavy artillery can hit targets at fixed points, so why can't our rocket launchers?"

Xie Rou was unhappy. What happened to her brother?

Isn’t the school motto: Strict standards and thorough work?
With such poor precision, how can one achieve great success?
"The main reason is that the warhead is not powerful enough. The 140-kilogram warhead has a killing range of only 80 meters. This means that the killing area of ​​a rocket is only 2 square meters; but the landing point is within an area of ​​150 million square meters. If all eight rockets from a rocket launcher fall within the range, it can only cover an area of ​​8 square meters..."

Fang Pengju's tone was lost, and his face looked even more melancholy.

In his opinion, the real success of a long-range rocket launcher is either to have a better density to ensure that each rocket can accurately hit the target; or to have a powerful warhead that can directly cover the entire area.

In order for the current density of rockets to destroy the entire landing area, the warhead of each rocket needs to have a killing radius of approximately 300 meters!
The gap is too big.

Or maybe his design level is not good enough.

"I've already told you to just install a tactical nuclear bomb on this thing, and there won't be any problems with the error!"

Xie Rou stood aside, looking at Fang Pengju with disdain.

When Xie Wei heard this, the corners of his mouth twitched several times and he looked at Xie Rou in disbelief.

When did Xie Rou's martial virtues reach such a level!
Loading rockets with tactical nuclear bombs?

Fortunately she dared to think about it.

On the other hand, Feng Ke, Wang Yuting and others had calm expressions.

Obviously, this is not the first time Xie Rou has said this.

"Uh, Xie Rou, didn't I tell you before that nuclear weapons are strategic weapons used to deter the enemy? Just like the sword of Damocles, it is always hanging over the enemy's head to make the enemy afraid; if it fails to completely destroy the enemy after it falls, it will lose its deterrent effect... conventional weapons can be used..."

"..."

Fang Pengju's words made Xie Wei's eyes suddenly widen.

Suddenly he seemed to understand where Xie Rou's abundant martial virtue came from.

Saturation strike and firepower coverage, Fang Pengju did this probably because he wanted to kill all the enemies with just one round of salvo!

"That's right~"

Xie Rou was obviously very dissatisfied with not being able to install the nuclear bomb.

"Or, let's add a simple inertial guidance system to this rocket... When we have a satellite positioning system in the future, plus satellite navigation... If that doesn't work, we can increase the number of tubes from 8 to 12..."

"Well, didn't we agree that we will discuss adding guidance systems and increasing the number of tubes after the test results at the national shooting range? We don't need it for now, we don't need it for now..."

Fang Pengju's mouth twitched and he wiped the cold sweat from his forehead.

Add guidance system?

The cost of the entire rocket would have to be multiplied several times. How many could the troops afford to equip?

If a guidance system was really installed, a battalion would be equipped with 18 guns, but an eight-barrel salvo could fire 144 missiles at a time, which would wipe out the annual military budget of several divisions.

Why do we need ultra-long-range rocket launchers?
If the number of tubes increases from 8 to 12, the number of missiles fired in one salvo will be 216.

The strike firepower has been improved, but the problem is that the cost of use has directly increased by 30%!
The fighter jets are not powerful enough and the heavy artillery has not a long enough range, so long-range rocket launchers have room to survive.

The army nowadays is so poor that even the officers and soldiers have to buckle their belts to the front eye, and it’s still not enough. How can they afford it?
"How much does a rocket launcher cost now? How much does a rocket shell cost?"

Seeing Fang Pengju wiping the cold sweat from his forehead, Xie Wei knew that Xie Rou must have mentioned it before.

I can't help but wonder about the cost of this long-range rocket launcher with a range of 120 kilometers.

"The launch system and chassis cost 87 yuan each; the current cost of each rocket is 3350 yuan..."

so cheap?

This was Xie Wei’s first reaction after Wang Yuting quoted the manufacturing price.

With such a cost, even adding a simple inertial guidance system would not increase the cost by much.

As a brother who dotes on his sister, Xie Wei felt that Xie Rou's request could be met.

The kid wants a rocket launcher with a simple guidance system. What's wrong with providing more funding?
"This is the current cost price, not including the R&D expenses, right?"

Xie Wei asked.

"Yes! Even without considering the R&D costs, it's too expensive! Our troops simply can't afford it."

Fang Pengju's face became even more desolate. "It would be best if each launch system only cost one or two hundred thousand, and each rocket only cost tens of thousands. Even at this price, the troops may not accept it..."

"..."

Xie Wei then realized that even though he had been in this era for quite some time and had deeply realized how precious money was these days, in his subconscious, the price of such an advanced rocket launcher was still very low.

Think about it again, the average salary in the country is only 30 to 40 yuan per month, and how much is the military expenditure in a year?

"when are we leaving?"

Xie Wei looked at Xie Rou and wanted to stop her from going.

Although it was freezing and snowy outside in Harbin, there was heating indoors so it didn't feel that hard.

From here to the Gobi Desert, those days...

"Don't think I'm not going! If I'm not there, improvements will be slow!"

Without waiting for Fang Pengju to answer, Xie Rou glared at Xie Wei with gritted teeth, her face full of anger.

She knew her brother well.

Fang Pengju shrugged and looked at Xie Wei helplessly: This is why he was looking for Xie Wei.

"Brother, Professor Fang can go to the Gobi Desert at such an old age, why can't I go? Why am I so special? Aren't you a party member? Where is your party spirit? Everyone is pursuing progress, why can't I pursue progress?"

Without waiting for Xie Wei to speak, Xie Rou questioned Xie Wei in rapid succession in front of everyone.

How could Xie Wei speak?
If you continue to stop Xie Rou or say in public that she cannot go, it would be a problem of ideological awareness.

"I didn't say I wouldn't let you go."

Xie Wei glared at Xie Rou secretly and tried to calm himself down.

After saying that, he said hello to Fang Pengju, turned around and left the workshop.

Seeing Xie Wei's condition, Fang Pengju signaled to Feng Ke beside him, who nodded and hurriedly chased after him.

"Monitor, wait."

Feng Ke chased Xie Wei all the way to the street outside before calling out to him.

Xie Wei stopped, took out a cigarette from his military coat pocket, threw one to Feng Ke, then took out a lighter to light the cigarette for him, then lit his own and took several deep puffs.

"Tomorrow morning, the core members of the team will leave with the launch vehicle. We won't take the railway, and the whole process is also a test of the launch system... I didn't tell her originally, but Wang Yuting has been taking care of her and giving her instructions during this period, and she found out..."

"That's why?"

Xie Wei threw the cigarette butt on the ground and stomped it out.

"The conditions there are tough. Principal Li asked the school's logistics department to prepare sufficient supplies. There are all kinds of supplies, including daily necessities for girls..."

Hearing this, Xie Wei felt a little relieved.

If it were him, no matter how difficult the conditions were, he wouldn't feel anything.

But Xie Rou is different.

The child is still young.

"The reason why we are in a hurry to conduct live-fire tests is that the principal has secured an opportunity for foreign customers to visit. If this long-range rocket can be favored by foreign customers, there will be no shortage of funds for the continued research and development of rocket launchers in the future. It can even provide support for other projects..."

Feng Ke looked around and whispered when he saw that no one was around, "With Xie Rou here, the improved plan will soon be able to generate data through simulation..."

Xie Wei frowned.

No wonder that old guy Li Rui didn’t come here with me after he went to Zhai Xinguo’s place with me.

Obviously he was afraid that he would get angry because of this.

“Where is the client from?”

If it was just the Thai side, the higher-ups wouldn't take it so seriously, right?

"He who wears a hat and raises camels."

Big dog owner?
(End of this chapter)