Siheyuan: I eat melons while doing scientific research

Chapter 1203 Gao Zhendong who flipped the table (4k, 5k more)

Whether it is a portable air defense projectile or a short-range air defense projectile that combines a missile and a gun, although the range has quadrupled, it cannot change the fact that it is the most basic and most common feature of the air defense system. On the contrary, the Changying-62 that we use mainly focuses on saving money where it should be saved, at least the guidance head still has a bit of a cost-effective meaning, but this short-range radar projectile has nothing at all, and what we want is a cheap and sufficient one.

However, Gao Zhendong had a solution to his problem: "You can do it this way. Just use the booster stage and don't need the rocket engine for the main missile body."

These words made Lin Lianwei feel numb, and not only him, but also the entire research team was numb.

"No, the original requirement was that the main missile body must also have power." This was Lin Lianwei. Other comrades were reluctant to say this, because this was not your original requirement.

"Yes, if the main missile body has no power, will the terminal maneuverability be insufficient?" Other comrades also spoke up. This was indeed their consideration, not only because Gao Zhendong mentioned the boost + main power endurance solution at the beginning. They are not stupid. After research, they think it is better to retain the main power endurance, which is naturally considered.

Gao Zhendong shook his head: "Blame me, blame me. I raised the requirements at the beginning, hahaha. That is the best configuration in terms of power, which is indeed good for terminal maneuverability. But the research goal of this missile is actually not very high in terms of terminal maneuverability. The aircraft has reached medium and low altitudes, how much energy can it have left to jump around? The worst that can be done is to fire two missiles in succession each time. When the requirements in other aspects are high, you can weigh and give up a little in this aspect. Your booster uses fast-burning high-pressure propellant to accelerate the missile to a relatively high speed in the shortest time. Its remaining speed and energy are no problem at all in dealing with medium and low altitude fixed-wing aircraft and helicopters at the terminal."

This type of short-range anti-aircraft missile can only hit medium and low altitudes, and is mainly used for self-defense. It is unlike long-range missiles which have a slight offensive flavor. However, even this slight offensive flavor of long-range missiles will not be truly realized until decades later.

Thinking of this, Gao Zhendong remembered that the score was 6 to 0. The long-range anti-aircraft missiles directly blocked the enemy airport. Are you afraid?

"Well... Advisor Gao, that does make sense. However, we don't just want to shoot down planes. We also want to deal with missiles, bombs and other things. This was also the request you put forward at the time." said a comrade from the Institute of Guidance and Research.

Gao Zhendong smiled and said, "As for the ammunition, the radar needs to be able to detect and track in time. As for the bullet, the requirements are not that high. Think about it, let's not talk about the bomb. The trajectory of that thing is like that, and the energy is not high. It can't make much maneuver. Even if it is a missile with high energy storage, or even a missile that is still in the active phase, how much maneuver can it make?"

In fact, among these targets, leaving aside the difficulty of detection and tracking, from the perspective of maneuverability alone, the most difficult to deal with are actually aircraft with continuous self-powered power!

As for missiles, especially long-range missiles, when they fly over the top of this air defense system, there is a high probability that their fuel will be burned out, and they will glide purely by inertia and aerodynamics, and the maneuvers they can make are very limited.

Today's aircraft and missiles are not so maneuverable and do not require so many fancy tricks, so simpler solutions can be used.

The comrade from the Institute of Guidance and Research thought about it and slapped his thigh, "That's right! Just thinking about this matter is difficult and advanced, but ignoring the essence of the goal! Senior Advisor, I learn from you."

Gao Zhendong smiled and said, "Think about it, if you adopt this plan, how much benefit will you get?"

The comrade in charge of the overall short-range air defense missiles began counting on his fingers.

"In this way, the design of the main missile body will be much simpler, and a lot of money can be saved in terms of structure and manufacturing."

"Not only that, Boss. In this way, the flight control system of this missile will be much simpler. We only need to consider the situation in two stages. Even in the second half of the process when the booster is jettisoned, the center of mass of the missile will not change. This is a great thing for us in flight control."

Gao Zhendong nodded: "Yes, when you design the overall design, you can fully consider the change in the center of mass during the booster combustion process and control it within a certain range. At this time, the missile body is long and heavy, and the impact of the charge combustion on the center of mass is relatively small, so the design and flight control are relatively easy. In this way, not to mention that you don't need a closed-loop flight control system, you can even save almost all the autopilot and save a lot of money."

Want to save money, right? Then go for a big one. However, Gao Zhendong was not worried that he couldn't make this thing. After all, he had seen a similar plan in the book he just found, and in terms of hardware conditions, the conditions that comrades have now are no worse than those that those plans had at the time.

Comrades did not doubt Gao Zhendong's conclusion. After all, in the field of automatic control, Gao Zhendong was among the best in China at that time. Many universities were using the textbooks he wrote. Almost everyone who had anything to do with control had a copy of the book. The book was not cheap, but it was worth it for those who worked in this field.

He said there is no problem, so at least in theory there is no problem, but it is impossible for others to calculate it for you right now.

By this calculation, the price of this bullet is falling rapidly.

The key point is that the consultant solved the problem and saved money at the same time, which is incredible. Generally speaking, if you can take care of one of them, it is already a success, but the consultant here obviously felt that it was not enough.

At this point, Gao Zhendong simply said: "One thing you need to pay attention to is that in this case, the increase in the required normal acceleration at the end of the trajectory and the decrease in the missile speed will lead to a significant increase in the missile's angle of attack, which is not favorable, so you have to solve this problem."

Gao Zhendong did not say how to solve the problem, but let the comrades figure it out on their own.

Facts show that when the problem is clear, comrades are not vegetarians.

"Enlarge the wings! Increase the lift surface." A comrade blurted out.

"Yes! And it increases the tail area."

"Make the tail fin foldable. The booster is thicker than the main missile body anyway, so there is plenty of space for folding."

Comrades, unwilling to be left behind, offered suggestions one after another, and this potential hidden danger was resolved in no time.

Vice President Zhou looked at his comrades. Although he had not had much contact with Gao Zhendong, this was the first time he saw Gao Zhendong's ability in this area. He was almost omniscient. Although the final details were left to the comrades to solve, the road was clearly pointed out. If this couldn't go on, then it would be better to stop doing it as soon as possible.

"What kind of guidance method are you planning to use for this missile?" Since we are here, we might as well take a look at the guidance method.

"Radar beam..." Speaking of this, Lin Lianwei was no longer sleepy. This was his specialty. The missile had a simple structure, and the flight control and guidance were combined together, all of which were his responsibility.

Gao Zhendong frowned: "Because it's cheap and ready-made?"

Lin Lianwei nodded: "Yes, the radar beam only needs a tail antenna and a relatively simple analog guidance device to solve the problem, and this set of equipment is already available on the K-5."

K-5 is the first generation radar air-to-air missile that both the Russians and us disliked after receiving it. It is considered a pioneer, but as we all know, pioneers are usually lousy. The worst part is the radar beam guidance.

But there is nothing wrong with what Lin Lianwei said, this thing is indeed simple and cheap.

Gao Zhendong smiled and said, "Now that we can save money elsewhere, we might as well increase the cost a little and use radio command guidance. This thing is also cheap, not much more expensive than beam guidance. Moreover, radar beam guidance means that if you want to achieve multi-target combat, you will have to pay a lot of price on the radar. When you calculate it all, it is not necessarily possible to save much money."

Theoretically, it is not difficult to use radar beam guidance to target multiple targets. All you need to do is create multiple beams pointing to different targets.

But in reality, this is extremely difficult.

Putting aside the sidelobe performance and beam width of current radars, a radar needs to simultaneously launch multiple highly directional beams on a macroscopic scale of time, while also taking into account that the radar's directivity is not too restricted. Does this remind you of something? Yes, phased array... Pulse PD is a bit reluctant in this matter.

Alternatively, you can get multiple guided radars, but this is simply a fantasy for such a limited field air defense system. At the same time, paying such a high price for short-range air defense is simply a waste of time.

Radio commands are much easier to handle. As long as the radar has multi-target tracking capabilities, it is not difficult to use appropriate coding methods in radio commands and command multiple missiles at the same time.

Coincidentally, pulse Doppler radar happens to have the capability of multi-target tracking.

Lin Lianwei was stunned. He had finally saved some money, but he immediately spent it all again.

However, after thinking about it, he felt that Gao Zhendong's suggestion was really good. At this time, the performance of the radar beam guidance was so good that even the dogs on the roadside shook their heads.

"Don't be stingy with the money. As long as it does not exceed the overall requirements, my suggestion is to focus on performance as much as possible." Gao Zhendong smiled, as if he could see Lin Lianwei's thoughts.

"That's no problem. This money is saved by you anyway, so it doesn't matter if you spend it again." Lin Lianwei joked.

Everyone present laughed. It was worth it to spend the money happily!

Seeing that the problem of short-range air defense missiles had been solved, and solved thoroughly, even the configuration and guidance method had been changed, the comrades on the other two sides became anxious.

We are still in a dilemma here. Although we have found the direction and understood the core issues, it is better to get more benefits if we can.

It’s true that Lin Lianwei is a classmate of the senior consultant, but we are also comrades of the senior consultant, we are all the same.

"Counselor Gao, do you have any opinions on our two sides?"

Urgent, urgent.

Gao Zhendong smiled and said, "Regarding the ultra-long-range air-to-air missile, I suggest that you should not be restricted by the original medium-range air-to-air missile plan."

"Advisor Gao, what do you mean..." It looked like Advisor Gao was going to flip the table. However, he had already flipped the table once for short-range missiles, and ultra-long-range air-to-air missiles were more important combat equipment, so it was no big deal for him to flip the table.

"Yes, I mean to start from scratch and create a new configuration."

Although the configuration of the sparrow can be used now, Gao Zhendong really doesn't think much of it in the long run.

Judging from the appearance, the Citigroup Sparrow seems to be similar to the later AIM-120, including our own Thunder-12 and 15. The only difference is the size of the wings. In fact, this thing and the later ones are completely in two different technical directions.

"Advisor Gao, is there a big problem with the configuration now?" Seeing Gao Zhendong's decisive answer, the comrades probably realized something was wrong.

Gao Zhendong nodded: "The Sparrow uses a fully movable wing layout, and our current medium-range missile is derived from it and is the same. Because the control surface of this layout is near the center of mass, the control response is very fast, but it is limited to this. For long-range missiles, the resistance increases sharply when the wings are deflected, and the induced rolling torque generated by the wing surface is very high. At the same time, when the control wing surface plays a control role, the strong vortex generated is not conducive to the stability and maneuverability of the missile. In summary, it can still be used for medium- and short-range missiles, but if you want to use it for long-range, this layout will not work."

Gao Zhendong drew another picture and analyzed the layout of our existing medium-range air-to-air missiles.

The Sparrow's full-moving wing layout uses the wing that appears to be in the middle of the missile, near the center of mass, as a control surface. It appears to respond quickly, but in fact it has a lot of problems, because the control wing has to be made very large due to the control torque, and its position is in the middle of the missile body, so problems arise.

This layout was almost no longer used by all new missiles after entering the 20s, but our Thunder-80 did use it. The reason was that the prototype of the Thunder-11, the prototype of the "Asped" of the Leather Shoe Country, was the Sparrow.

The comrades felt suddenly enlightened when listening to Gao Zhendong's words.

To be honest, the comrades probably don't know why the Sparrow uses such a configuration, what are the advantages and disadvantages, that is, they just copy it, but what is the principle? It is almost unclear. This is also the norm for our early imitation equipment. The technical stage is only here, there is nothing we can do.

Now, after listening to it, the comrades at least have a clearer understanding of this area. Mr. Gao's advice is really helpful.

Gao Zhendong concluded: "So my suggestion is that for long-range and ultra-long-range missiles, we should not use the existing semi-active radar missile configuration. Let's make a new one."

Comrades imitated the Sparrow wreckage obtained from Jiaozhi for the medium-range semi-active radar missile. Gao Zhendong had no objection, because we needed to quickly acquire medium-range interception capability. Based on this requirement, imitation was the fastest way.

Now that we have a medium-range semi-active radar-guided interception capability that exceeds that of all our rivals, we might as well move towards quality.

(End of this chapter)