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"Since the probability of the missile disintegrating midway has reached nearly 20%, we consider strengthening the structure of the missile body so that it can withstand greater vibration or acceleration." The chief division said.

Either use a thicker load-bearing structure shell, or weld several reinforcing ribs on the shell.But in this way, the missile is bigger and heavier.

Bigger and heavier is not the key point. What Tang Hua worries about is: this is not a broken chain of the computer or microelectronic system, but a problem with the mechanical parts of the missile.This is beyond my control, and when will this problem be solved? Time is beyond my control.

"Why did these four missiles break off, while the other 18 missiles completed the flight normally?" Tang Hua asked, "Comrade Chief, I suggest that we review the test firing records of the 22 missiles again."

Chapter 122, The Secret Base on the Volga River

Zhao Zhongyao and Qian Sanqiang stayed in Moscow for a few more days after the meeting, and now they finally set off to return home.Or the propeller plane jumped all the way back, rushing home to celebrate the New Year.

The results of the laser physics conference were not small. Although Lao Zhao's paper was reviewed and reviewed and some content was cut by the Soviet Academy of Sciences, the content of laser theory and laser principle was retained.The shining medals on the chests of Lao Zhao and Lao Qian were also pinned.Now the Academy of Sciences is discussing whether to accept the two as foreign corresponding academicians.Of course, these are false names. The actual benefit is that the Soviet Union supported the construction of the laboratories of the Department of Physics of Tsinghua University and the Institute of Modern Physics of the Chinese Academy of Sciences, and a large number of sophisticated physics research instruments were already on the way.In addition, the Soviet Union itself is preparing a high-energy laser research and development department.

After all this was over, Lao Qian and Lao Zhao went home to celebrate the New Year, and Tang Hua was left alone in Moscow waiting for the customized version of the vector machine.The computer indicated that it would take three to four days to save up to four vector machines even if they worked overtime. After delivery, it would take more than two days for transshipment and air transportation.

Drinking the same Moldovan red wine of Putin's style, watching the S-25 missile shooting range test documentary, now it is not a question of the vector machine taking six days to arrive, but whether the S-25 missile can be rescued.

Of course, it means rescuing them in a short time.In the long run, the missile can definitely be fixed, it’s nothing more than patching east and west, and if the patch doesn’t work, some designs can be overthrown and restarted.

But this will not keep up with the War to Resist US Aggression and Aid Korea.What's the use of me helping the Soviet Union with weapons that can't be finalized immediately and then quickly used in the Korean battlefield...

Tang Hua wondered yesterday if he could bring someone from China to accompany him. No, it was socialism working overtime during the Chinese New Year.

The person Tang Hua most wanted to call for support from China was not Zhang Jue, the team leader of the computer fire control computer, but Lu Xiaopeng.

Tang Hua can do everything that Zhang Jue can do, regardless of software and hardware.Speaking of which, Zhang Jue is still his apprentice...

Lu Xiaopeng, an aviation expert, was a key figure in linking aerodynamics with computer programs when developing the Hongqi-1.Lao Lu has designed various aircraft, and is one of the few people in China who has been in contact with jet aircraft and has an understanding of the aerodynamic characteristics of high subsonic aircraft.Lao Lu is also familiar with the program development skills of the fire control computer. The last adjustment of the software and hardware of the fire control computer was made by Lao Lu.

Moreover, Lu Xiaopeng has already been to the Soviet Union once, and studied/internized in the Mikoyan Design Bureau.

However, the Third Special Bureau immediately stated that it was inconvenient to invite people from China to participate in the project, so Tang Hua had no choice but to give up.

In fact, the "Golden Eagle" project team of the Third Special Bureau has aviation experts and aerodynamic experts, but the brain waves have not been tuned to the same channel as Tang Hua yet.

It took a day, and Tang Hua watched all the documentaries of the 22 missile test launches.

After reading it, he wrote down the maneuvers and signal flow of each missile test in the corner of the test record report.

Tang Hua felt that it was not enough to just add it to the test shooting record. He simply got another piece of paper and drew the xy coordinate system. The x coordinate is time, and the y coordinate... Let's set it to height first.

Tang Hua misses Matlab very much now. If there is this thing, it will only take a few seconds.

After the xy coordinate system is set up, the parameters of the 22 missiles are marked on them, turning them into 22 crooked broken lines, of which 18 black lines are the missiles that are not broken, and 4 red lines are the missiles that disintegrated.

Time-altitude coordinates do not reveal any anomalies.The time-velocity coordinate has no meaning, and the S-25 missile engine cannot adjust the thrust. The velocity of all test-fired missiles changes with time is almost the same.

After velocity is acceleration.acceleration?

Tang Blin seems to have found Huadian...

However, after 10 minutes, the time-control command coordinates were analyzed, and Tang Hua found out to his dismay that there seemed to be no rules that could be seen at a glance. The 22 broken lines are still crooked, and the four broken missiles are no more exaggerated than the other 4 missiles.However, Tang Hua still felt that the flash of inspiration just now was the right direction.The only thing missing is Lu Xiaopeng, ah no, I need to find the aerodynamics expert Ilyic from the Third Special Bureau.

"Ilyic, I need to calculate the change in flight status and acceleration of these 22 missiles when executing these control commands."

Ilyich stroked his thinning hair, picked up a pen and began to calculate on the draft paper.

"Hey, doesn't the third special bureau have a computer?" Tang Hua asked.

"If you don't have high requirements for numerical accuracy, hand calculation is enough." Ilyic said, his hands didn't stop, and when he finished speaking, he had already listed the equations and calculated the parameters of the first missile.

Tang Hua waited patiently for Ilyic to calculate the flight status of the 22 missiles. After all the results were obtained, Tang Hua seemed to have discovered something valuable.

"This, 57G. This, 42G. Are the calculations confirmed?"

Ilyic took another look at the result, "That's right, the maximum instantaneous acceleration of these two missiles is very high."

The maximum maneuvering overload of the S-25 air defense missile is designed to be 30G.For example, a person weighing 150 catties originally bears 150 catties on his feet, but at 30G, his feet bear 4500 catties.The missile is designed with allowance in mind, and the approximate limit value is 40~45G. If it exceeds this figure, the foot will not be able to bear this weight anyway, and the missile will be crushed.

These two missiles with abnormally high acceleration states of 57G and 42G were two of the four missiles that broke off during flight.

So the question is, the other two missiles did not experience abnormally high acceleration, why did they break?

If the problem of these two missiles is not resolved, then Tang Hua's inference still cannot stand.

After kicking the aerodynamics expert Ilyic away, Tang Hua recruited the person in charge of the control system and steering motor system.After communicating with these two for a long time, I finally cooperated. I concluded that the acceleration of the two missiles also exceeded the limit in an instant. The time lag of the rudder surface and the motor caused the missile to swing abnormally beyond the theoretical calculation of aerodynamics. In the end, one missile swayed sideways like a cobra and flew forward with its belly. One missile spiraled in the sky, and then disintegrated one after another.

……

Twenty-four hours later, Tang Hua was already on a Mercedes-Benz train, heading southeast along the Volga River.

Tang Hua proposed the possible cause of the missile failure, how to verify it?In fact, it is not complicated. Go to the shooting range to shoot four missiles, and copy the control parameters of the four broken missiles.If the missile is still broken in the air, it means that the design of the control command is unreasonable, which caused the missile to break due to an overload exceeding the design value.

Moscow is a thousand kilometers from Stalingrad, and not far from Stalingrad, it is a desolate barren land.In this place more than 90 kilometers away from Stalingrad and less than [-] kilometers away from the lower reaches of the Volga River, there are tens of thousands of square kilometers of areas where no trace of human activities can be seen. Tang Hua is convinced or convinced.

What is this place for?Make a missile test launch site.

The Kapustin Yar missile launch site, also known as the country's 4th central test site and the central three-army joint test site, covers an area of ​​65000 square kilometers. In 1946, it was used to test the V-1 cruise missile and V-2 ballistic missile captured from Germany. As for the establishment, by 1951, more than a dozen radar tracking stations and optical measurement and observation stations had been built here, and the Soviet Union's own ballistic missiles should have been tested in Kapustin Yar.

This experiment does not pursue the success rate, but the failure rate.

A total of 16 S-25 sample bombs were prepared, and flight tests were carried out according to the parameters of the four broken missiles.If the parameters are consistent and the missile breaks as before, then the cause of the failure is determined.

What I am afraid of is that the missile is fired, and all the scheduled actions are completed, but the missile does not break...

The first missile quickly roared into the sky. When the S-25 missile was launched, it was like a small launch vehicle. The entire launch site was filled with smoke, and the air smelled of chemicals.The optical tracking system and high-speed cameras at the test launch site immediately tracked and locked the missile and started filming.But there is no need for a high-speed camera. Tang Hua can see it with the binoculars in his hand. After 10 seconds, the missile broke into two pieces in the air as usual.

The second missile flew up again, with exactly the same parameters as the first missile, and after 10 seconds, it broke into two pieces again.

The parameters of the third missile were not exactly the same as those of the first one, and the control signal that caused the missile to disintegrate was the same, but the control command was sent at 11 seconds, the speed was 5% faster, and the flight altitude remained the same. After 11 seconds, Tang Hua saw through the telescope a flying light spot high in the sky—the missile that rose into the sky turned into two light spots, and both of them stopped their upward momentum. Spin down and fall.

……

After shooting 16 missiles, this is the most extravagant failure reproduction package that Tang Hua has ever seen. Around the launch center of the missile test site, missile wreckage is falling everywhere on the ground with a radius of 15 kilometers.

Luxury is luxury, but this method really works.

"The test is over, thank you to all the comrades who work in the test site." Both the chief teacher and Tang Hua were present, and both of them felt relieved.The chief engineer was relieved because he found the reason why the S-25 missile broke and disintegrated. Although there is still a problem of poor control, at least one of the two technical difficulties has been overcome.

Tang Hua is finally looking forward to the moment when the will of the willows and flowers will be bright. It seems that the S-25 missile does not need to strengthen the body structure, and there is still hope to quickly solve the technical bottleneck and move to the next stage of testing.

"Comrade Modest," Tang Hua said to the chief teacher, "I think we can go back to Moscow now. Now, I want to solve two key problems of the 'Golden Eagle' project at once."

Chapter 123, The Treasure of Stalingrad

Tang Hua spent 16 missiles about the size of fighter jets in Kapustin Yar, proving that the missiles themselves are fine, and the problem lies in the control system.

So things entered Tang Hua's familiar territory again...