Chapter 686: Useful, but has flaws
Gao Zhendong was not going to make any comments on this magical weapon. At most, he would try his best to help increase the range without changing the size. Other than that, he didn't want to say anything, nor did he dare to say anything.

This thing is so good, why change it so much?
The comrades from the Land Equipment Bureau looked very satisfied. Regardless of the status of 130, at least 107 could do part-time work as the popular 130 after some modifications.

Thinking about this matter again, the comrades from the Land Equipment Bureau found it outrageous. This matter highlights a problem - this 130 fire really needs a big move.

At the same time, Gao Zhendong's words made the comrades at Fenglei Factory twitch their faces. They understood that the first problem with the rocket might be the rocket engine.

I haven’t seen the design of 107 yet, so even 30% cannot be guaranteed, but our 130 directly increases it by 50%, and it seems particularly confident.

It seems that the Land Equipment Bureau is quite dissatisfied with the range, and not just because the target was set too low, but because there are indeed problems with their own products.

"Chief Engineer Gao, can this really increase the range by 50% without making major changes to the missile body?"

The comrades at Fenglei Factory couldn't care less about so many things. Learning was the most important thing.

In fact, rockets are a weapon that we started developing relatively early, but that was just the beginning. Even the 130mm rocket was developed after their factory had been working on it for a long time and was unable to meet the minimum technical and tactical requirements. Only then did our country introduce some advanced rocket prototypes from the Russians.

Basically, the entire system is mainly borrowed. In this case, many things are borrowed, but no one knows why they are done this way.

Therefore, they are unsure about many things, not to mention that the 130 fire has not been completely dealt with yet, which makes them even more unsure.

Gao Zhendong smiled. "If the range is longer, it's hard to say. I've analyzed that the situation will be very complicated. A simple inaccuracy includes many situations, such as bullet drop, fan-out, trajectory intersection, large cumulative error, large random accuracy error, etc. But this is just a matter of ten kilometers, the situation is not that complicated, and there are not many additional things to consider when increasing to 15 kilometers."

To be honest, the comrades at Fenglei Factory were all confused by Gao Zhendong’s words.

Apart from the problem of large random precision errors, the comrades at Fenglei Factory had never encountered this problem, which made them even more ashamed. With their low technology, they even divided the difficulties they encountered into different levels.

I'm not even qualified to face the more advanced difficulties, so where the hell can I go to seek justice?

Even some of the possible problems raised by others are things we have never encountered or even heard of.

This made them think for the first time, "Is Chief Engineer Gao feeling unsatisfied?"

"Chief Engineer Gao, we have encountered the problem of insufficient random accuracy before. Analysis shows that the elevation and direction mechanisms have large displacements and cannot be locked. Later, we solved it by imitating similar parts of existing rocket launcher samples in the north."

Gao Zhendong didn't know about this and was speechless when he heard it. This situation was really unbelievable.

Fortunately, this basic problem has finally been solved. Once it is solved, we will have experience, and when we encounter similar situations again, it will not be a big problem.

Gao Zhendong did not express any opinion first. Let's see what the Land Equipment Bureau's requirements for the range are.

"Let me put it this way. A range of 15 kilometers can be achieved without major changes to the gun and ammunition. Above 20 kilometers, major changes are necessary, and the changes are many. You can decide which range you want."

After listening to Gao Zhendong's summary, the Luzhuang Bureau fell into a happy trouble, while the feelings of the Fenglei Factory were difficult to describe.

Are you happy? Of course you are happy! After all, you have tried every possible way to solve the problem, but they are still finding fault with you.

Is it embarrassing? Yes! For the same reason.

"Chief Engineer Gao, we have also tried to increase the range of the rocket, but 15 kilometers is difficult to achieve. Increasing the range requires lengthening the rocket, and lengthening the rocket will result in poor accuracy, but we haven't found the reason yet. There is no problem with the spin of the projectile, but the accuracy is poor."

Gao Zhendong smiled and said, "Don't worry. First of all, as I said just now, I don't need to modify the missile body for 15 kilometers. Secondly, I have the technology and confidence to ensure the accuracy after modifying the missile body."

"Use a tail fin of the same caliber for stability? The accuracy will also be very poor." The comrades at the Fenglei Factory had actually thought of many methods, but none of them were successful.

Gao Zhendong shook his head: "The tail fin of the same caliber will not work. Under supersonic conditions, there will be very serious turbulence at the tail, and the accuracy will certainly not be good. That thing is okay for low-speed rockets, but forget about high-speed ones."

The comrades at Fenglei Factory didn't even have time to say anything else. They just buried their heads in writing.

What are you standing there for? Remember!

They knew the phenomenon but not the cause. They didn't expect that others could know it without even looking at the experimental materials and processes.

These days, we have basically nothing about the theory of rockets. Any theoretical knowledge is extremely valuable to our comrades. This little bit of theory can help them avoid detours when designing different rockets.

Don't underestimate these little detours. These detours will eventually make up the eighteen bends on the mountain road.

At this time, the comrades from the Land Equipment Bureau simply made an adult decision.

——I want them all!
He couldn't make a hasty decision here, so he simply asked him to tell everything since the great god wouldn't run away anyway.

"Chief Engineer Gao, how about this? You tell the comrades at the Wind and Thunder Factory about both plans. We will go back and organize people to discuss the specific range. Do you think that's ok?"

The comrades from Fenglei Factory were a little surprised when they heard this. Wasn't this a bit greedy?
Unexpectedly, Gao Zhendong nodded immediately: "Well, this is a good idea." After that, he turned around and began to write and draw on the blackboard.

"If it's only 15 kilometers, the first thing to do is to change the propellant."

Seeing that people from several parties were frowning, Gao Zhendong smiled. He knew what they were worried about.

"Don't worry. I know what rockets are for. They are cheap and in large quantities. This is different from missiles. But the propellant I'm going to give you is not expensive. It's also a double-base propellant. The ingredients are slightly different, but the price is about the same."

Everyone, including the comrades from the Defense Work Committee, was relieved. Rockets are more expensive than artillery shells and use a lot of propellant. If Gao Zhendong suggested an absurdly expensive propellant, it would be a lot of fun.

"There is such a propellant? How come we didn't know about it?" This question is a bit unprofessional, but it is understandable. It is normal for people to be a little confused when they are surprised.

"After the previous meetings, I had a feeling that the rocket launcher would take action, so I prepared it specially for you. I have seen the performance of your current propellants, and there is a big difference." They are all double-base propellants, but there are still differences in quality.

There is still a certain difference between the propellants of rockets and missiles. Gao Zhendong found one that is more suitable for rockets at this stage, which is better than propellants and the price is not too expensive.

After saying that, Gao Zhendong took out a document from his bag and handed it to the comrades from Fenglei Factory.

"Take a look at this. This is the performance of this propellant. I have asked a colleague from a certain factory to test it. Don't worry about the authenticity of the data."

When the comrades from Fenglei Factory saw this, their eyes widened.

"Specific impulse 2500N.s/Kg?! How did you get that?"

Gao Zhendong looked bewildered: "That's how they matched it."

How can I explain this matter clearly?

The comrades from the Defense Work Committee and the Land Equipment Bureau looked confused. They were not familiar with Bi Chong. "Comrade, what is the significance of this data?"

A comrade from Fenglei Factory said: "The best double-base propellant we have now has a specific impulse of 2050N.s/kg... The specific impulse is directly related to the projectile weight or range."

This time they understood, and the comrades on both sides did the math and opened their eyes wide.

"Chief Engineer Gao, this thing can increase the range by more than 20%!!!"

Gao Zhendong smiled and said, "That's not how it's calculated. It's even higher. Considering the density of this thing, it's about 12% higher than the ordinary double-base propellant used by the comrades at Fenglei Factory. All in all, theoretically it can be increased by at least 30%."

The relationship between specific impulse and range is not a direct linear relationship, and the calculation is slightly complicated due to factors such as propellant density.

Shit, it’s more than 20%! The comrades from the Defense Work Committee and the Land Equipment Bureau were all upset.

Such a huge step forward has caused the comrades' concerns to resurface.

"Chief Engineer Gao, isn't this thing very expensive?" Between performance and cost, everyone understands the principle that you get what you pay for, you get two cents for two cents, and you get three dollars for three cents. If it's not expensive, how can it possibly support this performance?

Gao Zhendong thought for a moment and said, "It's a little more expensive, but not much. It just adds some Al and AP. At least it's not as expensive as using the original ammunition to increase the range by 30%."

To increase the range, without considering other indicators, the simplest way is to add more explosives.

What Gao Zhendong meant was that if the range is increased by 30% without changing the propellant and using the original propellant, the cost would be more than using this new propellant!

So it's even cheaper? The comrades from the Defense Work Committee and the Land Equipment Bureau were very happy.

The range is long, and the unit cost is cheaper. Okay, today's KPI has been completed, and I can go home.

Just this propellant can make all the comrades who are engaged in rocket launchers very happy. Why do they need a bicycle? People should not be too greedy.

Looking at their expressions, Gao Zhendong poured a basin of cold water on them.

“But this thing is not without flaws.”

Indeed, there is a problem, but I hope it is not a big problem, then it will be okay. Several comrades looked at Gao Zhendong nervously.

Chief Engineer Gao, this is not acceptable. Before I even chewed the skin of the sweet date I was given, a slap in the face came.

"This propellant produces a lot of smoke..."

What? There's a lot of smoke? What kind of defect is this?

(End of this chapter)