Chapter 688 It turns out the most radical one is here!
After listening to Gao Zhendong's words, both the Fenglei Factory and the Land Equipment Bureau of the Defense Work Committee were full of admiration for Gao Zhendong. This is what it means to do applied research, all aspects must be taken into consideration, not just the gains and losses of a city or a place.

This skill is easy to say, but very difficult to actually do.

The comrades at Fenglei Factory thought about it more and more and found it more interesting, and began to discuss it on this basis.

This is normal. There is more than one way to solve a problem, and the same method may have different details and trade-offs.

"Chief Engineer Gao, if we adopt this shape, will it increase the burning area?"

After that, the comrade drew a more complicated pattern on the blackboard, and its circumference was indeed much larger than that of the star. The increase in the circumference of the cavity cross section means that the combustion area of ​​the cavity in the entire column increases.

Gao Zhendong nodded first: "Well, the cross-section of the combustion cavity can be designed in this way, which can greatly increase the combustion area and will not directly burn the shell."

The comrades at Fenglei Factory were all smiling and happy, and put what they learned into practice, so their learning was not in vain.

Gao Zhendong shook his head again: "But it's not suitable for use here. There are two reasons. First, this shape is extremely complex to process, and the processing cost is high. The yield rate will be reduced, further pushing up the cost. This is a rocket, not a ballistic missile. A very important core demand of the former is to be cheap enough. The latter doesn't matter. That thing is ridiculously expensive to begin with, and the core demand is function and performance."

A battalion of rockets fired at the same time, even if they were the original 19-tube 130-round rockets, would still be nearly 200 rockets. It was too expensive and we really couldn't afford it.

The comrades from Fenglei Factory listened to his words and nodded in understanding. Indeed, they had not considered the processing issue.

"Secondly, this structure has a large number of weakly connected propellants, which may break and fall off when impacted during storage, transportation, and transfer. This places higher requirements on the mechanical properties of the propellant after forming, such as tensile strength. To meet these requirements, many other costs need to be paid, which makes it expensive. In fact, the star-shaped combustion surface also has this problem compared to the circular one, but the star shape is relatively better balanced, and considering the benefits, it is acceptable."

Still money!
When the comrades from the Defense Work Committee and the Land Equipment Bureau saw this, they were deeply moved.

Chief Engineer Gao has tried every possible way to ensure that we can afford and use the weapons as much as possible, rather than having to be nervous even when firing a cannon.

When it comes to applied research, advanced technology doesn't necessarily solve all problems; one has to strike a balance. As long as the requirements are met, the cheaper the better. Advanced technology may not necessarily be more useful in specific projects.

Seeing that he had almost finished talking, Gao Zhendong said: "These two technologies are the basis for range extension and can be used on all rockets. They can achieve the range extension mentioned above without greatly changing the size. As for ranges above 20 kilometers, we need to consider more things based on this."

The comrades then remembered that after talking for so long about the first option, there is also a plan with a longer range.

Comrades from Fenglei Factory still have a say in this matter. It’s not that they haven’t thought of a solution, but the results are not very good.

"Chief Engineer Gao, we need to lengthen the projectile, right?" The potential of the original projectile has been basically exhausted after Gao Zhendong changed the propellant and engine configuration. No matter what, the projectile size cannot reach a range of more than 20 kilometers.

Gao Zhendong nodded: "Well, if you want to make a missile with a range of more than 20 kilometers, this is a must. As for how much it can be pulled, you can redesign it according to the requirements for the projection weight."

Generally speaking, lengthening the engine means lengthening the warhead at the same time. Otherwise, it would be meaningless to go through so much effort and just drop a small bomb. There is another reason, that is, the longer the range, the lower the accuracy. In this case, a large warhead can provide many more accuracy compensation solutions, such as submunitions.

When the comrades from the Land Equipment Bureau heard this, they decided that it would be better to do it today than to wait for another day, so as to make a rough decision first, or at least form a rough idea of ​​the basic indicators, so as to avoid having to run around again and again.

They communicated with their comrades at the Fenglei Factory and decided on a new warhead size, which was much larger than the original one.

With this projection data, comrades from Fenglei Factory calculated it on paper. With the parameters of the new propellant, they could roughly estimate it.

A range of 25 kilometers requires a missile length of more than 1 meters.

This is normal. As Gao Zhendong knew in his previous life, the length of a 122mm rocket is about 40 meters when the range is 2.9 kilometers.

Of course, there is an invisible premise here, that is, the projection weight of 122 fire is much greater than that of 130 fire.

Gao Zhendong estimated that the propellant and engine technology he had come up with were basically the same as those of this 40-kilometer rocket. Considering the difference in caliber between 122 and 130, a range of about 1 meters and a range of 7 kilometers was considered the limit.

The comrades at Fenglei Factory were very satisfied with the result.

"Well, this size can be installed on a 230-type four-wheel drive off-road vehicle without any problem."

The Type 230 four-wheel drive off-road truck is an imitation of the old Russian GAZ-63. Although it has the notoriety of "GAZ-63, flips over when turning", in fact, this car is still a very good military four-wheel drive off-road truck for us at this time, and it is a good wheeled chassis.

The original 130 fire was installed on this chassis.

The length of the original 130mm truck is about 1 meter. Although the new 130mm truck is 0.7 meters longer, this length is actually not a problem for the 230 off-road vehicle, because the original 130mm truck was too short and did not even use up half of the length of the truck's cargo part.

In fact, the 230-type off-road vehicle is a little bit longer and heavier than the original 130-type vehicle. Gao Zhendong asked, "What about the load capacity?"

A comrade from Fenglei Factory said: "The load capacity is no problem. The load capacity of 230 is 1.5 tons. After the imitation is completed, we got a new steel material with high strength, so the load capacity of 230 off-road vehicle is higher than that of GAZ-63."

In his previous life, Gao Zhendong knew that the load capacity of 230 was not optimal due to the strength of the steel. To increase the strength, more steel had to be added. However, the machine could not be towed after adding steel, so after a thorough calculation, the load capacity did not increase.

As for why the current 230 has a higher load capacity, he has no idea.

Seventeenth Ministry of Machine Building: Why is that? Don’t you have any idea about it?
Gao Zhendong thought about it and made a suggestion: "Comrades, why don't we just lengthen the missile body a little bit, to about 2 meters, and make it 7 kilometers long!"

For a 40-kilometer missile, based on the 130 caliber, the length is roughly estimated to be around 2 meters, but the tube still needs to be a little longer to leave some room and there is also potential for upgrading.

After Gao Zhendong said this, all the comrades in the Land Equipment Bureau were at a loss.

Fuck, you want the whole thing to happen in one go, right?

The comrades from the Defense Work Committee then remembered the legend about Gao Zhendong in the committee.

"When Comrade Gao Zhendong is making do, he is really making do, but when he gets radical, he can definitely scare everyone to death!"

After all this time, you saved money here and made do there, and in the end it all ends up here, right?

Gao Zhendong analyzed: "If the 230 chassis is designed properly, it will be no problem to install a 2-meter tube. Moreover, the cost of rockets is all on the missiles. We can extend the tube to 6 meters and make two types of 2-meter 6-kilometer standard missiles and 1-kilometer extended-range missiles. We can do without the 7-kilometer extended-range missile, but we can't do without it. Anyway, if we don't produce it or use it, we won't spend money. Don't worry, we can make both the 25-kilometer and 40-kilometer missiles at the same time, and the research funds will not cost much more."

For Gao Zhendong, 40 kilometers is a must, which is very important for his ambition.

Gao Zhendong patted his chest so hard that it made a loud thump. He didn't know what others were thinking, but when he saw the expression on Comrade Lu Zhuangju's face, he could see that it was a mixture of shock, excitement, and confusion.

Gao Zhendong didn't say much, just looked at them with a smile. I have already set the target, it's up to you whether you will take the bait or not.

The comrade from the Defense Work Committee looked at the Fenglei Factory and asked: "Have you evaluated whether the 2-meter tube, plus the weight of the bullet, can be supported on the 7?"

The comrades from Fenglei Factory quickly opened the 130 truck part in the old 230 design data, estimated for a long time, and nodded.

"If it's 15 tubes, yes! 19 tubes is a bit of a stretch."

Gao Zhendong is not worried at all about the number of pipes. As long as it is developed and is easy to use, the troops will naturally follow the "law of true fragrance" to find a good chassis for it and increase the number of pipes.

The comrades from the Land Equipment Bureau discussed for a long time and seemed to have made up their minds. The main reason was that 40 kilometers was too attractive, and they also felt that Gao Zhendong's analysis of the reason for not spending too much money made sense.

Although at present, things 40 kilometers away may not be visible, but it is hard to say. We have planes and scouts.

There is a saying: "I can do without it, but I can't live without it."

They discussed it with the comrades from the Defense Work Committee, and then turned to the comrades from the Wind and Thunder Factory and said, "Well, this 15-tube, 2-meter plan will be taken into consideration."

The comrades at Fenglei Factory were very happy and wrote it down happily.

After writing it down, they were actually the ones who were most worried.

"Chief Engineer Gao, let's increase the length. We have no doubt that the range has been increased, but we are worried about the accuracy of 40 kilometers, let alone 20 kilometers."

Gao Zhendong laughed and said, "Is it true that once the length of the projectile increases to more than 8 times the caliber, the accuracy will drop sharply?"

This is the reason why the old 130 fire is only about 1 meter long. If it is longer, there will be problems.

The comrade from Fenglei Factory recalled some memories, thought for a while, and slapped his thigh: "Yes, yes, yes! Chief Engineer Gao is amazing! But we can't find the cause, and there is no problem with the spin of the projectile, but the accuracy is not good."

Gao Zhendong smiled and said, "Your 130 rocket uses turbine rotation stabilization, but this method has a big problem. That is, when the aspect ratio increases, the impact of the rocket's nutation during flight on its accuracy will deteriorate sharply."

(End of this chapter)