Chapter 691 The longer the range, the more things to consider


Chapter 691: As the range increases, there are more things to consider

"Hahaha, let me tell you, I have never heard of this 'unit range cost' before."

"Not to mention, after using this indicator, the cost increase really looks much better."

Everyone was laughing and joking happily. The boss thought for a long time and started laughing.

"Comrades, don't worry about the cost at all! I just estimated that the overall cost increase will not exceed 20%."

"So low?" Everyone was shocked.

"This new drug is actually not expensive. It is not much more expensive than the old drug for the same volume. Moreover, have you noticed any characteristics of this new drug?"

"What characteristics?"

"This new propellant is a cast type..."

As soon as this sentence was said, everyone reacted instantly.

The casting mold is easy to handle. As long as the shape of the grain column is designed well, the casting process is well studied, and the mold is in good condition, the subsequent production process will not be associated with complexity.

Especially when they plan to use a single-propellant dual-thrust configuration, the grain column is integrally cast, and there is no need to consider issues such as the interface between dual propellants, nor does it require secondary casting.

Gao Zhendong said that the processing of star-shaped or other complex grain columns is complicated and increases the cost. This is a general conclusion, but the specific situation must be analyzed in detail, and different equipment is different.

For example, ballistic missiles may even require careful craftsmanship.

As for things like 107 fire, there is no need for it, just about the same, just cast it out and you're done.

"The comrades who developed the new propellant are so thoughtful. It has good performance, cheap price and simple production, hahaha."

"It's done, use it all! We can't let down the hard work of the propellant comrades."

"The most conservative estimate is that the range has been increased by more than 35%, which is exciting just thinking about it!"

Comrades working on rockets of other calibers do not know that 107 Fire has already begun to launch satellites without making any external changes.

The comrades of 130 and 180 have now met in the capital. Once again, under the leadership of the Defense Work Committee and the Land Loading Bureau, they went straight to the third rolling mill and the third factory.

The comrades from Changfeng Factory who are in charge of 180 have brought the records of Fenglei Factory from the last time and studied them first.

While watching, I was full of praise!

"So that's it..."

"I found it, I found it, the problem of the last experiment was found..."

"It seems we can't make this type of bullet anymore, we have to make a big change!"

It seemed incredible, as if they had entered the Grand View Garden with Grandma Liu.

But the truth is such an exaggeration. Every word Gao Zhendong said was new knowledge to them. They must know that in the original timeline, it was not until 1971 that the 180mm rocket launcher was completed, and its range was still 10 kilometers. The weakness of the relevant technology at this time is evident.

Gao Zhendong received them again. This time with "transfer students" comrades from Changfeng Factory, Gao Zhendong's opening remarks were different.

"Hello, comrades from Changfeng Factory, you have just arrived. Is there anything I need to add to the content of the last exchange between me and the comrades from Fenglei Factory?"

The comrades of Changfeng Factory said: "No, no, no, Chief Engineer Gao's words last time were explained in simple terms. The records of the comrades of Fenglei Factory are also very detailed, and they have basically been digested."

In fact, what Gao Zhendong said was not a complete theory, and it was mainly about window paper, so it did not have very complicated content. For the comrades of Changfeng Factory, it was quite easy to understand.

Gao Zhendong nodded: "Well, let's continue what we said last time. We have discussed the shortcomings of turbine engine rockets last time, that is, at high caliber, the missile body is prone to flight instability, and this flaw is innate. , it is difficult to avoid by improving the design and increasing the processing accuracy..."

And for rockets, blindly improving processing accuracy may not look good in terms of cost and production capacity.

"Then we should abandon the rotational stabilization and use the tail stabilization instead?" asked the comrade from Changfeng Factory.

Their concern is that the tail stabilizer requires a large space and cannot use directional tubes. The original 180mm rocket launcher used a directional cage between the directional tube and the "Katyusha" guide rail. It is estimated that this aspect was considered.

Gao Zhendong did not confirm or deny: "No, rotation stability is still needed, and the tail must be stabilized with folding wings. Of course, for rotation stability, there is no need to use a turbo rocket engine to spin. For lighter missiles, You can consider using the tail to tilt at a certain angle, or even adding a fixed winglet on the head to enhance the stabilizing effect. The combination of rotation and wing surface will play a stabilizing effect.”

There are two types of rocket tip winglets, one is fixed and the other is movable. The former plays a stabilizing role and also provides a stabilizing moment at the end of the warhead, which plays a certain role in the stable flight of the rocket. benefit. The latter is a controllable rocket, but this thing is still a bit far away for the time being.

For rockets, Gao Zhendong did not dare to suggest inertial navigation correction at this time, because it was too expensive. Although the Chijian-61 individual anti-tank missile has a gyroscope, there is only one on it, and the accuracy requirements are not high. Moreover, it is not used for inertial navigation, but for missile attitude control and acquisition, so it is not expensive. A complete set of inertial navigation is very expensive at this time. Therefore, we can only work hard on the missile body, try to use simple physical means to achieve stability, and minimize the cumulative error during flight.

"Folding wings?" The comrades from Fenglei Factory were a little confused.

Otherwise, the cooperation between the directional tube and the rocket is very tight, and the folding wing is difficult to arrange.

Due to the structure of the rocket, the folding wings cannot be cut into the tail of the missile body, which will affect the installation of the rocket engine.

Gao Zhendong thought for a while and drew a picture on the blackboard.

"You can consider this approach."

The three arc-shaped tail fins are consistent with the curvature of the missile body. They are usually folded close to the missile body and unfolded after launch.

The comrades from Fenglei Factory took a look and said, eh, this thing works. It looks simple and quite smart.

Gao Zhendong gave them a warning: "This is the simplest folding method with the least impact on the projectile body, but it is not the best folding method. The longer the range, the bullet will easily drop."
< br>

It has flaws, but it is not unusable and must be used within a certain range. After all, this method is simple, has little impact on the missile body structure, has a large tail area, and has good stabilizing effect.

The second half of this sentence made the comrades in Changfeng Factory feel cold.

Since they learned that the 130 can hit 40 kilometers, they have higher expectations for the 180's range. After preliminary calculations, they feel that the hard range of 50 to 60 is no problem. Whether it can hit it accurately is another matter.

If you hear that if you hit it too far this way, you might drop the bullet, so why don't you worry?

"General Engineer Gao, why is this?"

Gao Zhendong smiled and said: "This has nothing to do with the missile structure, spin, stability, etc. It involves aerodynamic issues. Circular rotating objects will produce the Magnus effect when flying in the air, which will affect The projectile generates a lateral force perpendicular to the direction of rotation.”

Gao Zhendong knew that they were completely ignorant of this matter, from theory to practice. Instead of waiting for them to find a detour before solving the problem, it would be better to kill the problem from the beginning.

The Magnus Effect has been discovered for many years, so you can say it casually without making up the origin.

By the way, this Magnus is not the Magnus in WH40K who tied important information to a nuclear bomb and sent it to his father to blow up the cesspit under his father’s butt. Loyal! ! ! ! ! !

The comrades of Changfeng Factory looked at the pictures and explanations drawn by Gao Zhendong. At first they thought they had learned something, but later they realized something was wrong.

"However, the projectile body is basically uniform, and the lateral force it receives is also uniform overall. In other words, the projectile body is deflected as a whole. As long as this issue is fully considered, it may have a certain impact on the accuracy, but it will not cause the bullet to drop. ?”

Well, as expected of a comrade who engages in research, he absorbs things quickly and has ideas for finding problems, but things are not that simple.

"Well, you're right, but the problem with arc-shaped folding wings lies in the arc. After this thing unfolds and rotates, its aerodynamics look a bit like a cylinder..."

The comrades from Changfeng Factory looked at the circle Gao Zhendong added on the picture and suddenly realized: "I understand that in the small section of the tail fin, the approximate circle is much larger than the missile body, and the Magnus effect is different from that of the missile. The body is unbalanced, and this imbalance will eventually deflect the projectile, causing the missile to miss or suffer large-scale misalignment.”

Gao Zhendong nodded: "By the way, that's the problem, so you can consider using this structure for 25-kilometer bombs. After all, it is really simple and convenient. No matter how big it is, I don't recommend it. Even 40-kilometer bombs are not recommended."

"What about those who are 40 or above?"

Gao Zhendong drew a picture.

"Using straight folding wings and folding them like this will have a slightly greater impact on the shape of the missile body, but considering that this is the throat constriction part of the rocket engine, the overall impact is actually not big. Overall, this is better than the curved folding wings Be strong.”

Comrades from the Land Installation Bureau felt that Gao Zhendong's explanation was too detailed. It would be better to just use this straight folding wing instead of the arc folding wing.

Changfeng Factory and Fenglei Factory don't think so. They want to know about every possibility and its advantages and disadvantages. Different solutions may not work here, but they can still work there.

Just like a turbine engine, it is not suitable for use on long-range bombs, but it is perfect for use on a 10-kilometer range.

There is no such thing as rubbish technology, only rubbish design.

There is no equal sign between good technology and good results. Regarding this matter, the little devils have a lot to say. How did they use a bunch of advanced active phased array technologies to create a detection range of 37 kilometers? , many people have not thought about it.

"Then if the stability of the tail wing is strong enough, can we give up the rotational stability? After all, the Magnus effect caused by the rotational stability may cause the missile body to deviate and increase the error even if the arc-shaped folding wing is not used."


Gao Zhendong shook his head: "No, because rockets need to be cheap, and tiny rotation is one of the best ways to improve accuracy while being cheap."

(End of chapter)

Previous Details Next