Chapter 608: The main contradiction must be grasped by such a biased guy
This plan was named "Feijian 614" by them, which is a less formal internal name. It is estimated that the comrade who named it had read the famous eunuch masterpiece "The Legend of Shushan Swordsman" and was deeply impressed.
Lin Lianwei was very proud to see Gao Zhendong smiling.
"How about it, Lao Gao, isn't this Feijian 614 good?" The two are old classmates, and they get along very casually. If it were anyone else, even if they had this intention, they would probably be embarrassed to say this.
Gao Zhendong smiled and said nothing, still looking at the details of the plan.
However, Mr. Feng, the model chief engineer of Feijian 614, is an old comrade with rich experience, including experience in looking at faces.
"Chief Engineer Gao, is there something wrong?" The other party's smile and lack of praise clearly meant that the plan was flawed.
Gao Zhendong smiled and said: "I'll take another look and see that there are some things that need to be adjusted."
These words made Mr. Feng and others feel relieved. It would be good if there were clear problems and directions for adjustment. At least it meant that the problems in the plan had been seen and could be corrected and optimized immediately instead of moving forward with problems.
After watching for a while, Gao Zhendong put down the plan, and Mr. Feng and others looked at him expectantly.
Gao Zhendong sorted out his thoughts: "Let's talk about it one by one."
"First of all, the diameter of the projectile should be as small as possible. 90 is a bit high. Even if it is a little longer, it will be fine. About 70mm will be enough. Any larger will cause too much resistance."
In fact, whether it is Citigroup or Lao Maozi, mature portable anti-aircraft missiles have a diameter of 70mm, and the aspect ratio is the same as that of a large number of air-to-air missiles, which is above 20.
Mr. Feng frowned: "Mr. Gao, we thought it was too detailed and difficult to arrange."
Gao Zhendong smiled and said: "This is the lightest light bomb. The propellant that can be carried is limited. The range and shooting height are the biggest contradictions. Everything else must give way to this target. Moreover, the combat area of this is in the middle Low altitude, do you remember anything?”
In fact, the Guangdong Research Institute also knew that the purpose of this projectile was to achieve a high range within an extremely limited projectile body, so Chief Engineer Feng always had a pneumatic background and responded quickly: "Mr. Gao, what do you mean? Yes, the air density at mid- to low-altitude is high and the resistance is greater?”
Gao Zhendong nodded: "Yes, so the design and choices of this bomb are different from the air-to-air missiles that mainly operate at medium and high altitudes, and the carrier aircraft can also give initial kinetic energy. The subsystem of the air-to-air bomb can be learned and applied, but overall The plan is definitely different.”
Mr. Feng understood now: "Mr. Gao, what you mean is that we must first reduce the weight and resistance of the bullet as much as possible?"
It is worthy of the old experience of the Institute of Guidance and Research. The response is fast and the direction is accurate.
"By the way, with this goal in mind, the other places that need to be changed are obvious. For example, this..."
Gao Zhendong pointed his pen at a cabin section in the structural diagram.
Lin Lianwei was stunned when he saw it: "Lao Gao, you don't need cooling anymore? The sensitivity of the infrared seeker is not that high anymore, and the ability we want to fight head-on may be greatly weakened or even eliminated."< br>
Gao Zhendong smiled: "We must retain it when fighting head-on. This is the biggest advantage of this missile."
Neither Citigroup's Red Eye nor Lao Maozi's Arrow-2 a few years later had the ability to fight head-on. Coupled with the speed of less than Mach 2, faster fixed-wing fighters could neither attack before they launched an attack. Destroy its flight attitude, and during its breakaway process after attack, the threat is relatively limited due to the low speed of the missile.
However, if you are flying a helicopter, you don’t have this worry. The helicopter flies too slowly, and you can easily catch up with it from behind.
"Then you don't even want refrigeration?"
"Who said no? Refrigeration is still refrigeration, but the heaviest gas cylinder is placed here!" Gao Zhendong pointed to the bottom of the launcher.
The gas cylinder is a pressure vessel. Its structure and materials make it heavy.
"Put it outside?" The comrades from the Guidance and Research Institute did not react at first, but after recovering from the surprise, they thought about it carefully and realized that it was wonderful!
"This method seems to be good. It can effectively reduce the weight of the missile body." Although the gas cylinder is still heavy, the missile does not need to carry this thing to fly upward.
"By concentrating the weight at the front, the center of gravity balance problem caused by the missile and launch tube being too long is easier to solve."
"Well, that's right. If you put it here, you don't have to worry about the diameter of the pressure vessel being too small due to the wall thickness. You can freely use the size and shape of the vessel." When the wall thickness is relatively large, the volume ratio will decrease if the diameter is small. It is very ugly. If the floor area ratio is ugly, it must be lengthened. If it is lengthened, it must gain weight...
Gao Zhendong smiled and said: "Missiles are a system, and we have to consider things within the system, and different systems have different requirements and considerations. For example, for air-to-air missiles, the disposable ones are missiles, and the main battle weapons are aircraft, so we must try to reduce the dead weight and complexity of the aircraft while keeping the total weight of the system basically unchanged..."
Mr. Feng slapped his thigh: "Yes, yes, Mr. Gao's words suddenly enlightened me. In this portable anti-aircraft bullet, the anti-aircraft bullet is the main battle 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 bottle on the launch tube is the best way. And there is another advantage..."
Everyone looked at him, curious about what else was good. Gao Zhendong pointed to the missile: "If by chance the launch is canceled after turning on the cooling, no launch opportunity is found, the external gas cylinder is much easier to replace and replenish than the one built into the projectile body."
"It's so comprehensive..." Several people praised him one after another. Even the logistics and maintenance performance were taken into consideration. Everyone admired Gao Zhendong's idea, but Gao Zhendong himself didn't feel much about it. Sometimes he even felt that everyone had no idea. A little deliberate?
In fact, this is a common illusion, common among people with relatively strong abilities.
——What’s the big deal? Others must understand such a simple thing, right?
When a person takes certain knowledge, skills, and abilities he has mastered for granted, he is unlikely to realize that the "common sense" he feels is brand new or difficult for others.
Especially when Gao Zhendong's mind is full of advanced "common sense".
So sometimes when someone says, "It's so simple, why are you so stupid?", he is really not mocking, but he really thinks so.
Lin Lianwei knew the weight of the cooling cylinder best. He calculated it in his mind and was overjoyed: "In this way, the missile body can be reduced by several hundred grams!"
Don’t underestimate a few hundred grams. The total weight of this bomb is only about 10kg. This is a weight reduction of several percent. In a mature design, this is a very amazing weight reduction ratio.
With this good start, several comrades are even more looking forward to Gao Zhendong's other improvement suggestions.
Gao Zhendong then pointed to the warhead: "My suggestion is not to use a continuous rod warhead. The rod warhead is not effective under this size limit. Just use a prefabricated fragment warhead."
If the cooling device is a necessary design, but the Research Institute did not consider the location of the arrangement, then the continuous rod warhead is simply copied lazily.
Precisely because it was laziness, without Gao Zhendong's explanation, the comrades at the Institute of Guidance and Research could figure out why the prefabricated fragmentation warhead was used, which caused a big red face.
If you get caught slacking off, everyone will blush.
Seeing that he didn't need to explain this matter, Gao Zhendong continued.
"There is no need for a gas rudder. The mobility requirements for the initial stage of this projectile are not that high, and when the engine is working, it cannot support the tail section so that the gas rudder can continue to be effective. The rudder surface is controlled by the folding winglets on the front of the projectile. can meet the requirements. This can further reduce costs, reduce weight, and increase reliability.”
The gas rudder is actually of little significance on this missile, and it uses tungsten-molybdenum alloy. Compared with ordinary aerodynamic control rudders, this thing is really heavy and expensive, and there is also the issue of wiring to the tail of the missile. Seven Seven or eighty eight adds up to several hundred grams.
The person in charge of the guidance was his good classmate Comrade Lin Lianwei. After listening to his words, he turned around in his head several times and cheered loudly.
"It's true, Lao Gao, it has to be you."
Gao Zhendong laughed and said: "To develop this kind of side weapon with more extreme requirements, we must grasp the main contradiction. If we grasp this, it will be easier to choose other things."
After speaking, he pointed to the guide: "Here now, there is a core issue. Maybe you are not aware of it, but it is a very important issue."
This thing was still within Lin Lianwei's scope, but it made him anxious to death.
"Lao Gao, stop being so pretentious and tell me quickly. I'm so worried."
Gao Zhendong did not give the answer directly, but inspired him.
"The main combat mode of this missile is from where to hit?"
"Hit me from the ground to the sky. I don't know why." Lin Lianwei was a bit stupid. He still wanted to ask?
"Then the blow from the ground to the sky will cause you to be responsible for this part. Think about it carefully."
Knowing that Gao Zhendong was not deliberately making things difficult for him, but was teaching himself how to find and resolve conflicts, Lin Lianwei also pondered honestly.
"Go to the sky, I am responsible for... guidance, what are you afraid of in guidance? Afraid of being inaccurate... With cadmium mercury telluride... it is interference... interference, sky... sky..."
Thinking of this, he seemed to understand.
"The sun! The sun! For me, the biggest problem is the sun in the sky!"
For today's tactical aircraft, good weather is often required to achieve good attack results, and good weather is often accompanied by one thing, and that is the bright sun.
For infrared surface-to-air missiles that are fired from the bottom up and cannot freely choose their launch positions like aircraft, the sun causes more trouble than air-to-air missiles.
(End of chapter)