Li Shan knew that the strength of the items after vacuum treatment was related to the processing time, the longer the time, the better the strength would definitely be, and as for how long it would take, he had no definite number in his heart.

He had only taken out one of the transformers for now, leaving the others in the vacuum box, and if something went wrong with the one he had removed, he would keep the others for backup.

According to the position left by Lao Gu after modification, Li Shan installed the vacuum-treated transformer on the drone, everything was ready to stop, he took the drone to the open space outside, and started the test flight again.

Because this test flight is very important and will be directly related to the use and follow-up development of UAVs in the future, Li Shan has been nervous in his heart.

Turned on the power, the drone made a roar, the blades began to rotate, at this moment Li Shan was very nervous, the last time the transformer was broken down was at this time, but the thing that worried Li Shan did not happen this time, which made Li Shan breathe a sigh of relief, and then a continuous test was carried out to verify whether the test was successful.

This test flight was carried out on a vacant lot near his home, not far from the surrounding residential buildings, because he was afraid of the bombing plane, so Li Shan did not fly too high, just circled in circles.

Drones are nothing new to the general public, so when Li Shan tested the flight, he did not attract the attention of the people around him, only a few children watched and chased.

With the continuous increase of flight time, Li Shan's heart gradually relaxed, it seems that his transformation is successful, when the continuous flight time has exceeded nearly twenty minutes, he let out a long breath, this test should be considered a success.

"Young man, this drone of yours has been flying long enough, it can still fly after such a long time, and the drone I bought for my grandson ran out of power in less than ten minutes. Li Shan, who was secretly happy, was shocked into a cold sweat by such an ordinary sentence from a white-haired old man next to him.

He patronized himself to a great delight, but forgot one of the most important things.

Today's drones generally fly for a maximum of twenty minutes is very remarkable, but their own drone has been flying for so long, but the remote control has always displayed that the battery power is 100%, which if someone sees it, it will definitely feel that there is a problem.

Li Shan glanced at the old man deeply, feeling that he seemed to have said this unintentionally, but it was enough to arouse his own vigilance.

He hurriedly put away the drone and left the place in a hurry.

On the way home, Li Shan has been checking his behavior today, he is indeed a little casual, these things must not be easily displayed in front of the public.

After returning home, Li Shan was in a good mood, and today's test results showed that his assumption was correct, and using that jade for vacuum treatment was definitely a very good method, which greatly improved the strength of the transformer, which was enough to withstand the strong electrical energy brought by the battery.

This vacuum treatment has only been going on for two days, so the other two transformers that are still being vacuum treated should be more tolerant.

Li Shan then thought about whether other parts could be vacuumed as well, since the transformer could.

If you vacuum all the components of your drone, I don't know how powerful your drone performance will be at that time.

Thinking of this, Li Shan couldn't help but grin.

Next, Li Shan took out the other two transformers in the vacuum box and installed them on the other two drones, and at the same time, he used the mysterious pulverized coal to transform several ordinary batteries and installed them on the three drones respectively.

In this way, all three of his drones have the ability to travel ultra-long distances.

It's just that his earliest drone didn't have a satellite navigation device, so the control range was limited, while the other two were able to fly anywhere as long as there was a satellite signal.

For the sake of convenience, Li Shan set the earliest UAV as No. 1, and the other two as No. 2 and No. 3 respectively, and the latter two UAVs have the conditions for live firing after they have long-range navigation capabilities.

That night, Li Shan extinguished the indicator light on the No. 2 drone, so that the drone would not attract the attention of others when flying at night.

In order to avoid interference, Li Shan was not big enough to lie on the bed at home to control.

He found an inconspicuous corner outside and sat down, looked around to see that there was no one, and then released the drone in his hand.

The target was set on the remote control in advance, and the target was in the Qinling Mountains due south, and after the coordinates were set, Li Shan began this far-reaching flight.

This flight is not only to test the ability to control the UAV through satellite signals, but also to test whether the performance of the UAV in all aspects can meet the requirements of long-distance flight. The straight-line distance from here to the destination is 48 kilometers, and with the return trip, it has long exceeded the distance that ordinary electronically controlled drones can fly.

That night, the weather was sunny, the temperature was 9 degrees Celsius, the wind was light, the wind force was 2-3, the wind direction was easterly, and the weather conditions were very suitable for drone flight. The drone flew at a speed of 110 kilometers per hour, flew at an altitude of 500 meters, and flew from north to due south, spanning almost the entire city of Chang'an.

Li Shan intends to let the drone fly along the central axis of Chang'an City, this is the first time he Li Shan overlooks Chang'an City from the air at night, and the colorful and beautiful night scene naturally amazes Li Shan.

It took less than half an hour to fly to the designated location, where after a short stop, the return route was carried out.

For the sake of prudence, he was not equipped with a bullet launcher for the sake of prudence, and he was worried that if something happened to the drone, it would not arouse the suspicion of others, and it would only be regarded as an ordinary "bombing" accident.

In order to ensure that the drone is fully loaded, Li Shan also strapped an item of the same weight as the bullet launcher to the drone.

After flying several times in a row, and after each flight, Li Shan disassembled the drone to check if there were any problems with these parts to see if they could withstand such a long distance flight.

After inspection, it was found that there were no major problems except for some excessive heating and wear of the motor shaft, and the wear of the motor shaft was not enough to affect the normal flight of the drone. Only then did Li Shan install a bullet launcher and prepare to control the drone to Qinling Mountain for live-fire training.

Due to the high mountains and dense forests in the Qinling Mountains at night, the visibility could not meet the requirements of shooting, and it had to be carried out during the day. Therefore, Li Shan first flew the drone into the mountains at night, and then conducted a live-fire test during the day.

After testing, Li Shan found that the effective range of this bullet can reach 300 meters, and the accuracy of shooting has been fully adjusted, and it can accurately hit the target through the green cross or laser corrector on the camera, and basically there is no need to adjust the system on the drone.

Another feature of this device for firing bullets is that the cartridge casing can be left in the firing device after the bullet is fired, and the cartridge casing can be taken out when the bullet is replaced.

Since there was no source of supply for bullets, one shot would be less than one, and Li Shan didn't dare to shoot casually, but he just stopped when he felt that the purpose of the test shot had been achieved.

Li Shan has been very busy in the recent stage, he regards going to the summit union as his main job in the near future, and his purpose is to make a breakthrough in repairing drones as soon as possible, thinking that it is okay to stay in the factory anyway, so he asked the unit for a long vacation under the pretext of having something at home, so that neither end of the delay will be delayed.

Seeing Li Shan's busy appearance all day long, Director Liu still believed it and asked Li Shan with concern if he was too busy at home, he could bring it up to the unit

Li Shan was a little weak-hearted, and said that he didn't need it, he could handle it himself.

He asked for leave and said that something was just an excuse at home, but he didn't expect something to happen on this day.

On this day, Li Shan was disassembling a drone in the operation room of the Summit Joint Maintenance Department, when he received a strange phone call.

Li Shan was a little puzzled, thinking that this could not be another call to sell advertisements, and he was very busy at hand, so he didn't answer.

But this phone call came again after a while, and after repeating it several times, Li Shan was a little puzzled, he came to the corridor outside and connected the phone, as soon as the phone was connected, an unfamiliar female voice came over on the other end, and it was still the tone of questioning: "I called you so much, why didn't you answer?"

"Who are you, do I have to answer your call?" Li Shan replied unceremoniously.

"Is your name Li Shan?"

"Yes, what's wrong?" the other party was able to call out his name, which made Li Shan wonder.

"There is a lady who was sent to the hospital, we saw the identity she carried with her, her name is Yan Guizhi, who is she?"

"What are you talking about, what is her name?" Li Shan was a little anxious when he heard this, and hurriedly asked again.

The other party repeated the name again, Yan Guizhi was Li Shan's mother, and Li Shan hurriedly asked what was going on.

It turned out that the caller was a nurse, the nurse said that the patient was walking on the sidewalk when he became ill, and suddenly felt a sharp pain in his stomach, and then sat on the ground in pain, fortunately, a good Samaritan was sent to the hospital, as for what the disease was, it is not clear, the doctor is checking, this phone was found in an address book on the patient's body, I hope the family will come over immediately, and then said the address of the hospital.

Li Shan was in a hurry, so he hurriedly asked Wang Gong for leave, and went straight to the hospital.

What happened to his mother, the people over there didn't make it clear, which made Li Shan even more anxious.

When I arrived at the emergency department of the hospital, I found that my father had also arrived, and quickly asked what was going on, and my father told Li Shan that your mother had acute appendicitis, and she had been perforated and had to be operated on immediately.

Seeing that Li Shan was a little anxious, his father comforted Li Shan and said: "It doesn't matter, appendicitis is also a common disease, and the doctor said that it was sent to the hospital in a timely manner, and it should not be a big problem." ”

After nearly two hours of surgery, Yan Guizhi was finally out of danger, which made Li Shan breathe a sigh of relief.

So Li Shan took the initiative to start accompanying her, and when he saw that his mother had woken up, he hurriedly asked her how she felt.

When my mother saw Li Shan, his anxious expression was overflowing, so she comforted him and said that he felt okay, but now that the effect of the anesthetic has passed, he still feels a little painful, but he can bear it.

At this time, the unit also came, Director Liu took a few colleagues to visit the patient, Li Shan took the gifts brought by the colleagues and thanked him repeatedly, the director said that your mother was sick and did not say a word, and then we inquired in many ways to know, so we came to see, and let Li Shan rest assured to accompany the patient here, and any difficulties can be raised to the organization.

Li Shanlian said that there was no difficulty, and thanked his colleagues again.

When he saw off his colleague and just returned to the ward, the other patients in the ward asked Li Shan to avoid it, because this was a female ward, and another female patient inside said that he wanted to change his clothes.