Chapter 551: Donkey: Without me, this book would be less than 3.2 million words
"Donkey's apical secretion."
I heard this word coming out of Xu Yun's mouth.
A big question mark suddenly appeared on the somewhat solemn faces of Qian Bingqiong and Ye Duzheng:
"o.o?"
Apocrine secretion?
What is that?
A few seconds passed.
Qian Bingqiong came to his senses first.
I saw him gently touching his chin, with a hint of speculation in his eyes, and said to Xu Yun:
"Comrade Han Li, do you mean that the secretion of apogeon is made from donkey skin, which is the traditional concept of donkey-hide gelatin?"
Qian Bingqiong wants to come.
The apical secretion that Xu Yun mentioned most likely refers to donkey hide gelatin.
It's just that because Xu Yun stayed in Europe for a long time, he forgot to use traditional expressions for a while.
However, Xu Yun quickly shook his head and explained:
"Comrade Qian, you have misunderstood. What I am talking about is not donkey-hide gelatin, but a special mucus secreted from the body surface of donkeys."
"This mucus is secreted through the donkey's exocrine glands. To put it bluntly, it can be understood as the donkey's...sweat."
As we all know.
In addition to thermal conductivity, pressure resistance, and light texture, the airship's capsule material also has a very important property requirement.
That is......
Flexibility...or ductility should be high.
This property is not difficult to understand from a situational perspective.
The location where the stratospheric airship floats is at an altitude of 20,000 to 30,000 meters or even higher above the ground.
Its inner wall can use a gas exchange membrane to reduce the pressure difference, while the body surface needs to withstand the pull of various external and internal forces.
So it's obviously not possible without a certain degree of resilience.
Later generations' solutions in this regard are relatively fixed, generally using composite materials and high-molecular polymer materials.
For example, polyimide film, polytetrafluoroethylene, etc.
After all, the industrial level has already reached that level.
At the time when Xu Yun traveled through time.
Domestic stratospheric airships have even developed to the point of adding micro-nano materials for optimization, and are quite mature.
But in this era, Xu Yun doesn't have many choices.
The quality of cotton fabrics and nylon is obviously not up to standard, and mylar membrane is still tightly controlled by DuPont and is listed in the first column of the third page of contraband items.
So after thinking about it.
Xu Yun suddenly thought of a wonderful idea:
correct.
Can we find Brother Donkey, the protagonist of this book?
do not forget.
At the end of the original 1850 copy, Halo once gave a quest reward of hemostatic gel.
After returning to reality.
Xu Yun handed over this technology to his good friend Qiu Sheng.
As a result, during a certain quantitative experiment, Qiu Sheng accidentally got some unwashed donkey skin mucus on a tuft of donkey hair.
Then Qiu Sheng discovered...
After these slimes sit with benzoquinoline for a period of time, they will form a very viscous colloidal object.
So Qiu Sheng used a rheometer to measure the longitudinal adhesive force, and found that its viscosity curve exceeded 860. (See Chapter 352)
This situation is also consistent with Academician Yang Huanming’s original papers, namely 10./j.ki.hljxmsy.2021.02.0100 and 10./n.kjrb.2014.007254.
As for benzoquinoline...
This thing came out as early as 1926.
Even in this era, there are no fewer than twenty units with production capacity in the country.
So it's natural.
Xu Yun then turned his mind to the mucus of local donkeys...that is, apical secretions.
Just mix the apical secretion liquid and benzoquinoline and let it stand to adjust the colloid that Qiu Sheng had originally.
All that remains is to make it into a solid capsule - this step can be left to domestic chemical experts, and it is not a particularly difficult technology.
True.
A native donkey does not contribute much apical fluid.
But don't forget...
The time when Pakistani donkeys ‘invaded’ the country was in the 1990s, more than thirty years ago.
That is to say...
At present, almost all donkeys in China are standard local donkeys!
Based on data released later.
Currently, there are probably hundreds of local donkeys in the entire 221 Factory, and there are even more local donkeys in Haiyan County not far away.
In other words, with full mobilization, it shouldn't be a big problem for the base to gather 500 donkeys.
If that doesn't work, you can still transfer them from the provincial capital - there are many factories in Xihai Province, and donkeys are needed in various places to help.
In a sense.
Today's donkeys are almost as common as later generations' cars.
As for how to produce apical secretion...
joke.
Wouldn’t it just be done by grinding?
Anyway, everyone in the base is eating steamed buns every day. Although the steamed buns of today are far less refined than those of later generations, no matter what, the noodles are definitely indispensable.
Therefore, as long as the local donkeys are allowed to grind under the sun and ensure the moisture and body, it is too easy to collect the secretion fluid...
Think of this.
Opposite Qian Bingqiong also roughly understood Xu Yun's thoughts.
Although he didn't know whether what Xu Yun said was true.
But it is very easy to verify this kind of thing. You can find someone to conduct experiments after leaving the house - there are many benzoquinolines in the base.
Therefore, he did not think about this aspect for too long, and quickly changed the topic and said to Xu Yun:
"Comrade Han Li, even if the airship you mentioned can be successfully produced, what about the remaining two questions?"
"That is, how to ensure that the specific trajectory of the U2 reconnaissance aircraft can be grasped, and how to ensure that the falling missile can accurately hit the U2 reconnaissance aircraft?"
Hear this.
Ye Duzheng and others also pricked up their ears.
Have to admit it.
Xu Yun's previous idea about airships was indeed very tempting and had successfully aroused their curiosity.
My little ears for gossip straightened up.jpg.
Xu Yun didn't care about this, and quickly raised his second finger and explained:
"Comrade Qian, let's do it one by one in order. First, let's talk about how to grasp the trajectory of the U2 reconnaissance plane..."
This chapter is not over yet, please click on the next page to continue reading! Said.
Xu Yun then looked at Ye Duzheng and said to him:
"Director Ye, your question is actually a bit substandard - have you forgotten the equipment you have been using these days?"
“The device I’ve been using these days?”
Ye Duzheng was slightly startled and thought about it for two seconds before he finally realized:
"Comrade Han Li, are you talking about the weather Doppler radar?"
Xu Yun nodded and affirmed:
"That's right, it's a weather Doppler radar. It can actually solve the trajectory problem you mentioned."
"After all, the working band of meteorological Doppler radar is very wide, ranging from l wave to x wave - this is to deal with different situations such as ice, wind, clouds and rain."
"But the fire control radar band owned by U2 is much narrower, mainly focusing on C-wave, X-wave, and KU-wave."
"So we can completely modify the radar band and frequency-modulate it into a detection radar that is harmless to humans and animals - U2 doesn't know that our Doppler radar has one-dimensional imaging capabilities comparable to fire control radars..."
Speaking of which.
Xu Yun couldn't help but look at Ye Duzheng meaningfully.
In fact, apart from the content above, there are some things he couldn't explain clearly.
That is...
Based on many information decrypted by later generations.
In order to capture image data to the greatest extent possible, the equipment on the entire u2 body is almost barren to the extreme.
For example, there is no remote communication equipment on u2 at all.
That's right.
There is no remote communication equipment.
That is to say, U2 was completely unable to communicate with the base where it took off while performing its mission.
This is also why in the original history, U2 was shot down successively in the territory of Bear and Rabbit, but people across the sea thought it was an accidental crash at first.
Another example...
The U2 is only equipped with three detection radars that can detect fire control radars, and does not have any other types of detection equipment.
That is to say...
U2 can only detect specific millimeter waves of the fire control radar, and other signals, even ordinary search radar signals, cannot be detected.
Of course.
The reason for the design of U2 is not to deceive pilots.
It's because search radars these days simply can't reach the three-dimensional accuracy of fire control radars, so nothing will happen to U2 even if it is scanned by the search radar - at most it will just expose itself to fly to a certain area.
It is simply impossible to lock the precise flight trajectory by relying on search radar.
So it only needs to consider the signal of the fire control radar, and the remaining space can be used to store film.
But the problem is...
Now with the emergence of Xu Yun, the weather Doppler radar has come out ahead of schedule.
Although in 2023, when Xu Yun traveled back in time, the Doppler principle was also widely used in the field of fire control radar.
However, this part of the application mainly lies in the X-wave and KU-band, which does not mean that the weather Doppler radar after adjusting the wavelength is also a fire control radar.
Just adjust the wavelength to an interval such as 1.7 centimeters.
With the assistance of dual-band and one-dimensional imaging methods, it can completely achieve the appearance of a detection radar, but have the accuracy of a fire control radar.
That is to say, U2 can successfully grasp its flight path when it is completely unaware of it.
Invest in the parts originally assembled at the base.
The weather Doppler radar in the base has a scanning range of up to 500 kilometers, which means it can grasp the precise movements of the U2 reconnaissance aircraft within 40 minutes!
more importantly......
This is also an idea that can be tested in practice in the short term - just try it the next time U2 flies over.
If u2 temporarily changes course or increases altitude.
That means this trick is useless to u2, it has discovered the rabbits' peek.
But if u2 still flies along the established route...
After realizing this.
Ye Duzheng's breathing suddenly became heavier and he stared at Xu Yun with burning eyes:
"So Comrade Han Li, what about the third question I asked?"
How to ensure that the falling missile can accurately hit the U2 reconnaissance aircraft.
Among the three questions raised by Ye Duzheng.
This is actually the most difficult one.
To know.
The normal flight altitude of U2 is 22,000 meters, and it can reach 25,000 or even 27,000 meters at its highest.
This means that the altitude of the stratospheric airship must be at least 30,000 meters, so that it cannot be observed by U2 pilots within visual distance through naked eye vision.
When u2 performs photography tasks, the height will generally be reduced to about 18,000 meters.
That is, in the actual combat stage.
The straight-line height difference between the stratospheric airship and U2 will most likely reach more than 10,000 meters!
Missile pursuit at such a high altitude is not just about calculating free fall like middle school and high school physics. Many very complex scenarios need to be taken into consideration:
For example, wind resistance.
For example, the air pressure difference at different altitudes causes subtle deformation of the missile.
Another example is u2's speed change or even track change.
It's like you are at the top of the central building in Shanghai and want to throw a piece of chalk at a person walking on the road 500 meters away.
No matter how accurate your calculations are, various unforeseen circumstances will happen - if you are not sure, a child on the roadside let out a cry when someone is about to reach your location, and the target stops and looks at it for two seconds. Who can calculate this?
But on the other hand.
Since Xu Yun has considered the first two situations, it is impossible not to be aware of this problem.
In other words...
Maybe Xu Yun also has a solution?
And directly opposite Ye Du.
"...."
Xu Yun was silent for a few seconds, and continued to correct his next speech in his mind before speaking slowly:
"Director Ye, first of all I want to ask you a question - I wonder if you have heard of this technology."
Ye Duzheng glanced at him:
"What technology?"
Xu Yun grinned slightly:
"Radio proximity fuze."
"Radio proximity fuse?"
I heard this word spoken by Xu Yun.
Ye Duzheng seemed a little confused, but Qian Bingqiong on the side spoke:
"Comrade Han Li, you are talking about the VT fuse invented across the sea during World War II?"
Xu Yun nodded:
"That's right."
Mentioned above.
It is indeed very difficult for a slender cannonball to hit an aircraft flying at high speed hundreds to thousands of meters in the air.
Students who served in the Air Force during World War II should all know this.
There were statistics during the Battle of Britain in 1940.
To hit an aircraft on the battlefield, about 2,500 artillery shells need to be fired, which means the hit rate is 4 out of 10,000.
Such a probability makes pilots basically not afraid of ground artillery, and ground artillery only has a driving effect on aircraft.
But in the middle and late stages of World War II, a special weapon appeared.
It is a radio proximity fuze.
The core principle of this thing is actually the Doppler effect:
That is to say, a radar is installed on the warhead of the artillery shell. When the distance between the artillery shell and the aircraft decreases, the frequency received by the radar will become higher and higher.
When the frequency reaches a certain level, it means it has entered the detonation range.
In this way, the cannonball can automatically detonate and cause damage.
This wireless proximity fuse artillery shell became the best-selling weapon product in World War II. The other side of the sea made a full US$1 billion from it, and half of the funds for the Manhattan Project came from it.
So making arms is really profitable...
all in all.
This kind of weapon is not unfamiliar to Qian Bingqiong, who is currently in charge of nuclear research. At least it is much more familiar to him than Ye Duzheng, who is engaged in meteorology:
"Comrade Han Li, do you mean... to add a radio proximity fuze module in front of the artillery shell?"
"But the detonation range of the radio proximity fuze is limited. Unless U2 happens to pass through the killing area, it will be useless even if the fuze is set."
"What's more, today's fighter jets and reconnaissance aircraft are equipped with jamming transmitters, which will emit radio waves of the same frequency but with higher power, making the missile mistakenly think that it is very close to the target and detonate."
"So no matter which angle you look at, the radio proximity fuze has little chance of success."
Xu Yun nodded when he heard this and admitted frankly:
"That's right, unless you launch hundreds or even thousands of stratospheric airships into the sky at once and try your luck with the human sea tactic."
"Otherwise, it is indeed wishful thinking to rely on radio proximity fuzes to solve U2, and the success rate is infinitely close to 0."
"But Comrade Qian, do you think there is such a possibility?"
"Change the fuze to another device that can lock U2's position on its own. It can guide the missile to change direction. It will automatically lock and catch up with the opponent without waiting for U2 to reach the impact point..."
"When the opponent turns, it turns, and when the opponent dives, it dives too, and the speed is faster than the aircraft's maximum speed. Finally..."
"Boom!"
Xu Yun's long voice sounded to Qian Bingqiong's ears like the whisper of a succubus... ahem, a devil.
In just a few words.
This made Qian Bingqiong's heart beat loudly.
Cannonballs that can lock the opponent's position and change direction to pursue...?
Is it really possible that such a weapon exists?
To know.
Although the German V1 missile in World War II was known as a tracking missile, its actual length was nearly eight meters.
The so-called guidance capability only relies on the magnetic compass.
The v1 missile needs to have a sufficient trajectory preset in advance to launch smoothly, and the terminal acceleration essentially relies on the opening of the spoiler...
The same is true for the similar Fritz-X radio command guided bomb, which only relies on radio calibration.
In addition, as far as Qian Bingqiong knows.
The infrared guidance currently being studied internationally is also in a similar situation, such as aim-9 and aa-2 air-to-air missiles, etc.
That is to say, it is not difficult to change the direction of the missile. What is difficult is changing the direction for the purpose of chasing the target.
Almost all missiles these days are inseparable from manual calibration, which is also known as shooting Zhuyuan in later generations.
But now Xu Yun has thrown out such a concept, and judging from Xu Yun's previous performance, he is obviously not a big talker.
Could it be...
Is there really a door?
After a while.
Qian Bingqiong took a deep breath, forced himself to calm down, and asked Xu Yun seriously:
"Comrade Han Li, what is the principle of this positioning device you are talking about? Can you introduce it to me?"
Ye Duzheng waved to Lin Yu who was standing aside, motioning for her to come forward.
After all, when it comes to the concepts of radar and electromagnetics, the only "own person" on the scene who has the highest attainments in this regard is Lin Yu, and the others are only half a bucket of water at most.
Xu Yun quickly picked up a pen and paper and wrote a formula on the paper:
△r=c/2b.
Lin Yu took a look and blurted out a few words:
"Gaussian pulse?"
Xu Yun nodded and affirmed:
"That's right, it's Gaussian pulse."
"The b in the formula represents the signal bandwidth. The larger the bandwidth, the higher the resolution."
Then he continued writing:
f(t)=ape^-(2πt2/2a2).
p(f)=ape^-(πa2f2/2).
Lin Yu also gave the names of two formulas at the same time:
"This is...the time domain characteristic expression and frequency domain characteristic expression of Gaussian pulse?"
Xu Yun subconsciously prepared to snap his fingers again, but after thinking of the pain he felt when doing this action before, he obediently changed it to a thumb:
"Bingo, it is not difficult to see from this formula that the pulse changes as a changes in the formula."
"The smaller a, the smaller the pulse width, the larger the spectrum width, and the higher the resolution."
"..."
Lin Yu's eyes once again scanned the paper in front of him for a while, and he said thoughtfully:
"I understand, Comrade Han Li, is your idea..."
"Using some kind of special pulse signal for target identification?"
Xu Yun nodded vigorously:
"Yes, to put it simply, a device is placed on the missile to emit a narrow pulse and then receive the pulse signal returned by the target scattering."
"The device has a simple logic method to determine the target distance by calculating the time between transmitting and receiving pulses."
"At the same time, because this method directly transmits the baseband pulse signal on the fundamental wave, there is no need to worry about this signal being interfered by U2's radio jammer, and there is no need to worry about accuracy."
If it were not limited by physical injuries.
At this moment, Xu Yun actually wanted to show Qian Bingqiong and the others a bright smile like Metkai's, and then say, "Please give me a good review, dear~"
That's right.
The technology Xu Yun came up with this time was exactly the "Lao Su" in the military field of later generations, that is, ultra-wideband proximity fuze technology.
Why is it called Lao Su?
The reason is that this technology is somewhat similar to Lao Su's reputation.
Those who belong to the circle feel like they are thunderous, but those outside the circle have some unexplained skills.
Take a first look.
Many people probably think this is something related to dial-up Internet access.
to be honest.
When the concept of tracking missiles is mentioned, another term may come to most people's minds:
Laser guidance.
But in fact.
Laser guidance is actually very complex, and its actual operation method is not necessarily what many people imagine, which relies entirely on the missile locking on to the target and flying.
To put it simply.
Laser guidance is like making a missile walk a tightrope.
That is to say, the laser irradiator first captures and tracks the target and gives the angle information of the target's direction.
The fire control computer then controls the missile launcher to launch the missile at the optimal angle so that it enters the laser beam.
The projectile is in flight.
The laser receiver on the missile receives the laser signal directly illuminated by the laser on the missile, processes the error required for guidance, and sends this error to the missile's control system.
The control system then controls the flight direction and attitude of the projectile, and always maintains the coincidence of the projectile and the laser beam.
Finally, the warhead is guided to the target.
In most cases.
Most laser irradiators are on aircraft or on the ground, and the missile's seeker only receives laser irradiation feedback.
This is called semi-active laser guidance.
Of course.
Active laser guidance technology corresponds to semi-active laser guidance. The illuminator is actually placed on the missile and is controlled by the missile itself.
However, missiles with this kind of configuration are generally huge, often more than ten meters in length.
Therefore, let alone whether the current rabbits can develop the components required for laser guidance.
The size and mass of the formed missile alone cannot be carried up by a stratospheric aircraft...
According to Xu Yun's design.
That stratospheric aircraft can carry at most four missiles with a body length of about two meters... This length should be more appropriately described by artillery shells.
There's really nothing we can do about it any more.
Therefore, Xu Yun gave up laser guidance this time and replaced it with ultra-wideband proximity fuze technology.
Ultra-wideband proximity fuze technology is a guidance technology that was only proposed in the past thirty years. The core is the pulse ranging principle.
Its principle is what Xu Yun said, calibrating the target distance and orientation based on the pulse signal.
This technology does not require many modules, and is somewhat similar to weather Doppler radar:
It is mainly composed of transmitting/receiving antennas, power amplifiers, pseudo-random code generators, clock circuits, narrow pulse generators, sampling integrators, signal processing and other modules.
First, the clock signal is encoded by a pseudo-random encoder to improve the anti-interference performance of the system.
Then the narrow pulse generator is driven to generate a pulse signal, which is radiated by the antenna through the power amplifier.
The target receives and returns the signal through the receiving antenna to the sampling integrator.
The clock signal generated during transmission will pass through a delayer at the same time - this delay determines the fixed detection distance.
Then a delayed pulse is generated and inserted into the sampling integrator.
This pulse signal is compared with the received signal to lock the target's position.
After determining the target location.
The signal processing module changes the aerodynamic rudder control to complete the steering of the artillery shell.
The whole principle is very simple and easy to understand.
Later, with the help of Lin Yu, he explained.
Qian Bingqiong and Ye Duzheng also understood Xu Yun's general thoughts.
About twenty or thirty seconds passed.
Qian Bingqiong pondered for a moment, frowned slightly, and continued:
"I have another question - Comrade Han Li, according to your statement, a one-meter-long artillery shell should not be able to accommodate these structures."
"After all, in addition to the warhead, the artillery shell also needs to be loaded with propellant to provide its flight kinetic energy. The mass is generally measured in kilograms."
"If you add the modules you mentioned, it will probably far exceed the actual capacity of the shell, right?"
"In this case, can the airship really take them to an altitude of more than 20,000 to 30,000 meters?"
Xu Yun shook his head slightly when he heard this, smiled and said to Qian Bingqiong:
"Comrade Qian, with all due respect, you seem to have overlooked a very basic situation."
"That is, our sniper environment this time is not ground-to-air, or even air-to-air in the standard sense, but..."
Said.
Xu Yun made a top-down gesture with his index finger:
"A 'bombing' like a free fall."
Hearing Xu Yun's words.
Qian Bingqiong was stunned for two seconds, and then he couldn't help but slap his head:
"Oh my, look at my brain, I almost forgot about this!"
indeed.
Because he was too concerned about the specific principles, Qian Bingqiong subconsciously ignored another thing:
The airship is suspended much higher than the U2 reconnaissance aircraft.
That is to say, a large part of the kinetic energy of the falling cannonball comes from its own gravity, and does not require the initial energy provided by propellant like normal launches.
Therefore, as long as there is some divertable fuel inside the shell, the rest of the space can be freed up to install ultra-wideband proximity fuses!
at the same time.
Qian Bingqiong suddenly realized another point:
At this moment.
After Xu Yun explained the problem of volume.
The three questions raised by Ye Duzheng before...
We already have answers that are completely tenable in theory!
Think of this.
Even though Qian Bingqiong had presided over many major projects, he couldn't help but feel a storm in his heart at this time.