Chapter 608 This kind of side guy needs to grasp the main contradiction

They named this plan "Flying Sword 614", which is an informal internal name. It is estimated that the comrade who came up with the name has seen the famous eunuch masterpiece "The Legend of Sword and Fairy" and was deeply impressed.

Seeing Gao Zhendong smile, Lin Lianwei was very proud.

"How about it, Lao Gao, this Flying Sword 614 is pretty good, right?" The two were old classmates and got along very casually. If it were someone else, even if they had this idea, they probably wouldn't be too embarrassed to say so.

Gao Zhendong smiled but said nothing, still looking at the details of the plan.

However, Mr. Feng, the chief designer of the Feijian 614 model, is an old comrade with rich experience, including experience in reading people's faces.

"Chief Engineer Gao, is there any problem?" The other party smiled without saying anything and did not give any praise, which clearly showed that the plan had flaws.

Gao Zhendong smiled and said, "Let me take a look. There are some areas that need to be adjusted."

This actually put Mr. Feng and his colleagues at ease. It was good that there were clear problems and directions for adjustment. At least it meant that the problems in the plan had been identified and could be corrected and optimized immediately, rather than moving forward with the problem.

After looking at it for a while, Gao Zhendong put down the plan, and Mr. Feng and others looked at him expectantly.

Gao Zhendong sorted out his thoughts and said, "Let's talk about them one by one."

"First of all, the diameter of the projectile should be as thin as possible. 90 is a bit high. It's okay if it's a little longer. About 70mm will be fine. If it's bigger, the resistance will be too great."

In fact, whether it is the Americans or the Russians, the mature portable air defense missiles all have a diameter of 70mm, and the aspect ratio is above 20, the same as a large number of air-to-air missiles.

Mr. Feng frowned and said, "Mr. Gao, we are considering that it is too detailed to be arranged."

Gao Zhendong smiled and said, "This is the lightest lightweight bullet. The amount of propellant it can carry is limited. The range and altitude are the biggest contradictions. Everything else must give way to this goal. Moreover, the combat zone of this bullet is at medium and low altitudes. Do you remember anything?"

In fact, the Institute of Missile Research also knew that the purpose of this missile was to maximize the range and altitude within a very limited missile body, so Chief Designer Feng, who was originally an aerodynamicist, responded quickly: "General Gao, do you mean that the air density at mid- and low-altitudes is high, and the resistance is greater?"

Gao Zhendong nodded: "Yes, so the design and selection of this missile are different from air-to-air missiles that are mainly used at medium and high altitudes and can be given initial kinetic energy by the carrier aircraft. The subsystems of air-to-air missiles can be borrowed and applied, but the overall plan is definitely different."

Mr. Feng understood now: "Mr. Gao, do you mean that we should first try to reduce the weight and resistance of the bullet?"

As expected of the Institute of Research’s experience, the response is quick and the direction is accurate.

"Oh, right, with this goal in mind, the other areas that need to be changed are very obvious. For example, this..."

Gao Zhendong pointed his pen at a compartment in the structural diagram.

Lin Lianwei was stunned: "Lao Gao, you don't even need cooling? Then the sensitivity of the infrared seeker will not be that high. The ability to hit the target head-on may be greatly weakened or even eliminated."

Gao Zhendong smiled: "We must retain the ability to attack head-on, which is the biggest advantage of this missile."

Neither the American Red Eye nor the Russian Arrow-2 a few years later had the ability to attack head-on. In addition, with a speed of less than Mach 2, they could not destroy the flight posture of faster fixed-wing fighters before they launched an attack. During the process of disengagement after the attack, the threat was relatively limited due to the low speed of the missile.

However, there is no such concern when shooting at a helicopter, because the helicopter flies too slowly and it is easy to catch up with it by rear-ending it.

"So you don't even want refrigeration?"

"Who said we don't want it? It's still refrigeration, but the heaviest gas cylinders should be placed here!" Gao Zhendong pointed to the bottom of the launch tube.

A gas cylinder is a pressure vessel, and its structure and material make it quite heavy.

"Put it outside?" The comrades from the Institute of Research did not react at first, but after they recovered from their surprise and thought about it carefully, they realized it was a great idea!

"This method seems to be good. It can effectively reduce the weight of the missile body." Although the gas cylinder is still as heavy, the missile does not need to carry this thing to fly up.

"By concentrating the weight at the front, the center of gravity balance problem caused by the missile and launch tube being too long is also easier to solve."

"Yes, yes, if we put it here, we don't have to worry about the diameter not being too small due to the wall thickness of the pressure vessel, and we can freely use the size and shape of the container." When the wall thickness is relatively large, the volume ratio will be very ugly if the diameter is small. If the volume ratio is ugly, the length must be increased, and if it is increased, the weight must be increased...

Gao Zhendong smiled and said: "A missile is a system. We need to consider things within the system, and different systems have different requirements and considerations. For example, for air-to-air missiles, the missile is disposable, and the main weapon is the aircraft, so we need to minimize the dead weight and complexity of the aircraft while keeping the total weight of the system basically unchanged..."

Mr. Feng slapped his thigh and said, "Yes, yes, yes. Mr. Gao's words have enlightened me. In this portable anti-aircraft bomb, the anti-aircraft bomb is the main combat weapon. The barrel and shell are not the main factors that determine the performance of the weapon."

Gao Zhendong smiled: "Yes, so putting the gas cylinder on the launch tube is the best way to deal with it. And there is another advantage to this..."

Everyone looked at him, curious about what other benefits there were. Gao Zhendong pointed at the missile and said, "If the launch is canceled after the cooling is turned on, but there is no launch opportunity, the external gas cylinder is much easier to replace and replenish than the one built into the missile body."

"It's such a comprehensive consideration..." Several people praised that even the logistics and maintenance performance were taken into consideration. Everyone admired Gao Zhendong's idea, but Gao Zhendong himself didn't feel anything. Sometimes he even wondered if everyone was being a little deliberate?

In fact, this is a common illusion, which is common among people with stronger abilities.

——What’s the big deal? It’s such a simple thing, everyone else must understand it, right?
When a person takes certain knowledge, skills, and abilities for granted, he or she is unlikely to realize that these "common sense" things he or she feels are completely new or difficult for others.

Especially when Gao Zhendong’s mind was full of advanced “common sense”.

So sometimes when someone says “It’s such a simple thing, why are you so stupid”, he is not really making fun of you, he really thinks so in his heart.

Lin Lianwei knew the weight of the cooling gas cylinder best. He calculated it in his mind and was delighted: "In this way, the missile body can be reduced by several hundred grams!"

Don't underestimate a few hundred grams. The total weight of the bullet is only about 10kg, which is a few percent weight reduction. In a mature design, this is an amazing weight reduction ratio.

With this good start, several comrades became more looking forward to Gao Zhendong's other suggestions for improvement.

Gao Zhendong then pointed to the warhead and said: "My suggestion is not to use a continuous rod warhead. The rod-type warhead is not very effective under this size limit. Just use a prefabricated fragmentation warhead."

If the cooling device is a necessary design, but the Institute of Research and Development did not consider its location, then the continuous rod warhead is pure laziness and copying.

It was precisely because of laziness that the comrades from the Institute of Missile Research would have figured out why prefabricated fragmentation warheads were used without Gao Zhendong's explanation, and they were embarrassed.

Anyone would be embarrassed if they were caught being lazy.

Seeing that this matter did not require his explanation, Gao Zhendong continued.

"The gas rudder is not needed. The initial maneuverability requirements of this missile are not that high. The engine working time is not enough to support the gas rudder to work in the tail stage. The control surface can be controlled by the folding winglets at the front of the missile body. This can further reduce costs, reduce weight, and increase reliability."

The gas rudder is actually not very meaningful on this missile, and it uses tungsten-molybdenum alloy, which is really heavy and expensive compared to ordinary pneumatic control surfaces. There is also the issue of wiring to the tail of the missile. All added up, it weighs several hundred grams.

The person in charge of guidance was his good classmate, Comrade Lin Lianwei. After listening to his words, he turned them over in his head and cheered loudly.

"Really, Lao Gao, it has to be you."

Gao Zhendong smiled and said, "When developing this kind of unconventional weapon that has relatively extreme requirements, we must grasp the main contradiction. Once we grasp this, it will be easier to choose other things."

After that, he pointed at the guide and said, "Now here, there is a core problem. Maybe you don't realize it, but it is a very important problem."

This thing is still beyond Lin Lianwei's range, and it makes him very anxious.

"Lao Gao, stop keeping me in suspense and tell me now. I'm getting so anxious."

Gao Zhendong did not give him the answer directly, but inspired him.

"The main combat mode of this missile is to fire from where to where?"

"Hit from the ground up into the sky, isn't it obvious?" Lin Lianwei looked a little dumbfounded. Why was he still asking this?

"Then, if you shoot from the ground to the sky, what kind of problems will this bring to you? Think about it carefully."

Knowing that Gao Zhendong was not deliberately making things difficult for him, but was teaching him how to find and resolve conflicts, Lin Lianwei also pondered over it honestly.

"Towards the sky, I'm responsible...guidance, what's there to be afraid of with guidance? Afraid of missing the target...With mercury cadmium telluride...that would be interference...interference, in the sky...in the sky..."

Thinking of this, he seemed to understand.

"The sun! The sun! The biggest problem for me is the sun in the sky!"

For today's tactical aircraft, good weather is often required to achieve good attack effects, and good weather is often accompanied by one thing, that is, the bright sun.

For infrared surface-to-air missiles that have to fire from the bottom up and cannot choose their launch positions as freely as airplanes, the trouble caused by the sun is much greater than that caused by air-to-air missiles.

(End of this chapter)