In the evening at Zhou Hui's house, Wang Yinan received an email from Dongfanghong Co., Ltd., which listed in detail the technical indicators of the new generation of transponders.

Wang Yinan is still vigilant enough, when he uses his mobile phone to receive emails, he never directly connects to Zhou Hui's i-Fi, nor does he directly use the operator's 4G network, but uses a dedicated VPN device to connect to the Gödel system point-to-point, and then access the Internet in the usual sense through the Gödel system.

In this way, even if someone has a way to monitor Wang Yinan's mobile phone, they will find nothing except encrypted data that cannot be unlocked.

The technical indicators of the transponder sent by Dongfanghong Co., Ltd. are somewhat unexpected by Wang Yinan, the bandwidth is still good, running in the latest Ka band, the bandwidth of each road has reached more than 100Gbps, but the weight is a bit beyond Wang Yinan's expectations, and the weight of the equipment is close to 500 kg.

"It's too heavy", looking at the dazzling 500Kg words, Wang Yinan frowned,

"What's the matter, you dislike me now, don't you?" , Zhou Hui sat in Wang Yinan's arms and pulled his ears, "You tell me honestly, who has a better figure",

"How can I say you, I'm talking about this equipment", Wang Yinan hurriedly explained,

Zhou Hui touched her belly, "It seems that there has been a little more fat recently", jumped down after speaking, took out a yoga mat, and turned on the TV in the living room, you know, now the new TV has a variety of fitness apps.

Zhou Hui opened one very skillfully and practiced it with a snort.

Wang Yinan walked to the bedroom, dialed Colonel Li's phone, and when the phone was connected, Colonel Li first asked, "Professor Wang, have you received the email?"

"I got it, but there is a question, now that electronic equipment is so developed, why is our transponder still so heavy", Wang Yinan asked,

"I don't know about this specific technical problem, so I'll ask the technician who sent you the email to call you, and ask him directly if you have any questions," said Senior Colonel Li.

"Okay", after speaking, Wang Yinan ran into the living room, practiced yoga with Zhou Hui and the others, practiced and practiced, and the two of them saw that they were about to wipe the gun again, Wang Yinan's phone rang,

"Professor Wang, I am Engineer Zhang of Dongfanghong Co., Ltd., you can call me Xiao Zhang, the information is sorted out by me, you can ask me directly if you have any questions", sure enough, it was a call from Dongfanghong,

"In this way, I see that the data of your transponder has a good bandwidth and has reached the international advanced level, but each way is close to 500 kilograms, is it too heavy", Wang Yinan asked,

"This weight is mainly the antenna and cooling system, to reach the ground 0.5 meters antenna can receive enough signal strength, the transmission power is small is definitely not good, after all, it is more than 30,000 kilometers from the ground synchronous orbit",,

"If superconducting materials are used to improve antennas and transceivers, will it reduce weight," Wang said.

"We haven't studied this aspect, so it should be feasible in theory, but the whole system definitely needs to be completely redesigned," replied Xiao Zhang.

"If you don't consider the surface covering, or if the distance is closer, the weight can be reduced a lot," Xiao Zhang adds.

"Distance", Wang Yinan almost slapped himself again, "Why am I so stupid", it seems that people will affect each other, I have been with Zhou Hui for a long time recently, and it seems that my IQ is a little average.

"What if the distance is only a few kilometers, and the object to be covered is not a surface, but a few points on the surface", Wang Yinan asked.

"That's too simple, I estimate that a few kilograms of weight is enough, after all, the attenuation of the signal will become more and more serious with the increase of distance", Xiao Zhang replied.

"I understand, thank you for your information and answers, we may have new model development requirements when we look back, and we will issue them to you through the Commission of Science and Technology", Wang Yinan finished speaking and hung up the phone.

Wang Yinan set the phone to silent and threw it on the sofa, Zhou Hui was practicing a very difficult yoga pose, Wang Yinan leaned over, "You didn't practice this action right",

"What's wrong, you look at the TV, that's how you practice",

"That's a solo action, the correct posture should be a double action", Wang Yinan said as he spoke, and stretched out his hand, (5,000 words omitted below).

Early the next morning, Wang Yinan boarded the flight to Shudu refreshed, the time was urgent, although he was timid, he still had the courage to get on the plane.

At noon, Chief Engineer Yang had already ordered lunch in the office and was waiting for Wang Yinan, and everyone was busy, so the procedure of inviting guests to dinner was omitted.

"Say, there is a big deal to find me", Chief Teacher Yang said,

"Let's talk about it first, we are an aeronautical research institute, not an aerospace research institute, at most we will reach the sky in the near space, and we don't have such a big ability to hit satellites into the sky."

It is estimated that Qian Lao revealed something to him in advance, and Chief Master Yang came up to clarify first, if you really want to play satellites, you should be crazy by yourself, 116 will be crazy, it will be too out of bounds.

"How is it possible, how much is a rocket, I can't afford to toss it with this little money", Wang Yinan shook his head, just kidding, although the rocket is going to be done, but it is definitely not now.

"I'll test you first, what kind of structure is the atmosphere of the blue star," Wang Yinan asked.

"It's too simple, troposphere, stratosphere, ozone layer, mesosphere, thermosphere and fugitive layer", Chief Master Yang opened his mouth.

"What layer does the general aircraft fly on and what is the altitude", Wang Yinan then asked,

"Generally in the troposphere, civil aircraft are generally below 15,000 meters, military aircraft are below 20,000 meters, and of course very few military aircraft can fly to an altitude of 30,000 meters," said Chief Engineer Yang.

"Generally speaking, the troposphere below 20,000 meters is considered to be the stratosphere, and the vast majority of meteorological activities are in the troposphere, and there is basically no air convection in the stratosphere," said Yang continued.

"Between 20,000 meters and 30,000 meters, the temperature is basically stable at minus 55 degrees, so the lowest part of the stratosphere is also called the stratosphere."

"The famous B-52 in the rice country is called the Stratofortress because it mainly cruises at this altitude."

"It's really like listening to your words, it's like reading a book for ten years", Wang Yinan applauded,

", don't tell me you don't know, I mean it for readers", Chief Master Yang slapped his hand away, "Say, what kind of idea are you playing",

"I heard that you have a stealth drone, called the Wind Shadow, is it a practical ceiling of about 30,000 meters?" , Wang Yinan asked,

"It's very well-informed," said Chief Teacher Yang.

"Nonsense, if your pneumatic shape is not sent to us for calculation, no one can hide it from me", Wang Yinan said proudly,

"Damn, I almost forgot, it's not a leak to tell you like this", Chief Master Yang nodded,

"Not long after the test flight, the performance was very good, we call it the eye of the stealth fighter", said Chief Engineer Yang.

"How much is the payload and what about the endurance time", Wang Yinan asked,

"The payload is 0.8 tons, the endurance is more than 12 hours, and the piston engine is used", replied Chief Engineer Yang.

"Regardless of the requirements of flight speed, the engine is replaced with a propeller driven by a superconducting electric motor, the fuel tank is replaced with a battery, and there is no stealth requirement in the upper part of the fuselage, and the latest solar panels are replaced," Wang Yinan said.

"How long do you think the battery life will be?" ，

"With the conversion efficiency of the existing solar cells, nearly half of the time every day, there is very sufficient sunlight, and the energy conversion efficiency of the superconducting motor is very high, so that during the day, the motor can be driven while charging", Mr. Yang began to say to himself.

"Use the electric energy in the lithium battery to drive the electric motor at night",

"In this case, as long as the payload is within a certain range, and the strength requirements of the drone are not as high as that of manned aircraft, composite materials can be used in large quantities",

"Speaking of composite materials, that He Zhenbo, Dr. Xiao He, is really good, not only has a lot of progress been made in high-temperature resistant materials, but even the composite materials have made a lot of good things, and the wind shadow has lost 400 kilograms, if you use composite materials on a larger range of the entire drone you envision, the weight of the aircraft will be lighter",

In the end, Chief Engineer Yang came to an astonishing conclusion, "If the payload does not exceed 800 kg, the aircraft does not need to land, and it will not be able to maintain cruise flight until the charge and discharge life of the lithium battery is limited and the battery capacity drops to 60%."

Wang Yinan nodded, "It's about the same as I estimated, but a complete charge and discharge once a day and night, almost 1800 times in five years."

"It's a big deal to fly down once every five years, change the battery, and upgrade the hardware by the way", Wang Yinan said.

"It's not difficult to design and manufacture this thing, according to your needs, and then use Ge Kunpeng to optimize the aerodynamic and flight control system, I estimate that the performance indicators can be better," said Chief Engineer Yang.

"And in addition to superconducting motors, they are all relatively mature technologies, so the cost will not be too high, I still don't understand, what are you doing with this thing flying around in the sky all day long, not tired",

Wang Yinan smiled proudly, how else to say that my brother is a genius,

"I ask you",

"If you were to get hundreds of such planes on the land of China, at an altitude of 30,000 meters, each of them would be circling in circles at high altitudes."

"Then on each plane, install a transponder, this I have already asked, use a satellite transponder, the version with reduced power will do",

"According to the artificial intelligence algorithm, the transponder is connected to the network, that is, it establishes a link with the terminal on the ground, and then forwards it multiple times through the nearby aircraft."

"It is also possible to select the best path in real time according to the load situation, and the whole is a typical routing problem, with mature algorithms",

"Each plane is equipped with ten or eight transponders, each transponder has a bandwidth of about 100Gbps, and there is nothing backward in technology.

"Those densely populated places are just that, we don't have any advantages, the South China Sea, the Western Xinjiang, this kind of vast sea, or deserted places, deploy one every few hundred kilometers."

"Even if the sky over the whole country is full, there will not be more than 1,000," Wang Yinan said.

"By the way, how much do you estimate the cost of one?" ，

"Two million soft girl coins", Mr. Yang subconsciously replied,

"With the addition of forwarding equipment, ground maintenance, etc., we double, four million soft sister coins",

"A thousand frames are four billion soft sister coins", Wang Yinan said,

"Tell me, is it expensive to use four billion soft sister coins to build a completely self-consistent communication network that covers all corners of the entire country and the data transmission time between two points is close to the physical limit?" ，

"Moreover, every node of this network is invisible to others",

"And, even if half of the nodes are knocked out, the entire network will still work",

"Moreover, we can send hundreds of planes up in minutes at any time, and the missiles are more expensive than our planes, so he can't afford to make an estimate."

"What do you think of my stratoplanar plan", Wang Yinan asked,

Even the long-tested Chief Master Yang was already stupid,

Is that okay? 8)