Originally, he rushed into the room very fast, but it dropped to hover in a short time, and stopped steadily on a coffee table with a length of only 70 cm. Mr. Luo and his students were experts. He could see at a glance that the intelligent technology contained in it was not comparable to any model aircraft. It was simply a drone!

Seeing the people around him, Luo Mingzhu smiled proudly and said, "Grandpa, how about this gift? Did Lu Xuan make it yesterday after he spent a day?"

"A day's kung fu?" Mr. Luo looked at each other with a few people around him. Can he make such a thing in a day's kung fu?

The coaxial double propeller uses a sleeve shaft to drive two pairs of inverted rotors. The high-power sleeve shaft is very difficult to mechanically. The sleeve shaft not only needs to transmit power, but also needs to transmit the total distance and periodic distance control of the upper rotor, which is quite difficult in mechanical design.

The blades of this drone use rigid intelligent rotors completely without waving the hinge to ensure that the upper and lower rotors will not collide when flying at high speed.

These technologies are extremely advanced even in military industry, and many of them are just a concept. If they are only made out of thin air without undergoing a lot of tests, even such small drones will be difficult to achieve.

Lu Xuan hurriedly said: "Grandpa, I have actually conducted aerodynamic simulation experiments on the computer, and the parts have been produced long ago. I just assembled yesterday!"

"It's almost done!" Mr. Luo looked at Luo Mingzhu and said, "Mingzhu, although you are not a skilled person, you still need to understand some common sense!"

Mr. Luo looked at the drone and felt like he had a treasure. How could he remember to be Grandfather’s thoughts?

"This is the American X-2 idea, Lu Xuan, what is the power of this helicopter?"

"Using aviation gasoline, a specially made turboprop engine, the rotor power is achieved through a gas transmission, which is very similar to the power transmission between the F35 engine and the lift fan in the United States. However, our power distribution is achieved through a smooth method. Starting the turboprop will not immediately disconnect the rotor power!"

"Is power distribution? Is it for safety performance? In fact, there is no need to be so conservative. This kind of thing is a classic rotorcraft. Unlike the MV-22 Osprey transport aircraft, even if it loses power, it will not lose balance. Instead, it will slowly land through rotor control. In theory, there will be no crash at all!"

The person who spoke was an old man, wearing a brand new black Zhongshan suit, looked very energetic. After Mr. Luo's understanding, Lu Xuan learned that this, like Mr. Luo, was also an old technician of Changhe Industry. Like them, there was also an old man Xu Languo. After the three of them retired, they all got together because of the same interests.

Mr. Zhang said: "And you are using an engine to drive rotors and propellers. Is the transmission efficiency sufficient?"

Lu Xuan smiled and said, "The efficiency loss is not large, and if one turboprop and a turbofan are used, the weight will increase. My unmanned high-speed helicopter is not large in the past. If two engines are added, it may not be able to fly! Moreover, when flying at high speed, it flies in the form of a rotorcraft. The two rotors on it do not require power, and only need it when taking off and landing vertically!"

"So that's the case, it's not the same as the American X-2 high-speed helicopter. The Americans have compound power, and the rotor and propeller provide propulsion at the same time. But what you made is like the AH-56 Cheyenne Heavy Helicopter built by the Americans back then, but the maneuverability and hovering are much stronger than Cheyenne!" Mr. Luo said: "How heavy can this thing carry?"

Lu Xuan smiled and said, "It weighs only 200 kilograms of empty weight and can carry 300 kilograms of cargo. If one hundred kilograms of fuel is added, the range is 300 kilometers and the battery life is more than half an hour. It is more than enough to help carry luggage!"

The three old men did not take a breath. They originally thought that this kind of drone was just a technical verification aircraft. If they wanted to make them into practical versions, they had to be enlarged and designed. However, they did not expect that the performance of this kind of drone should not be underestimated. Although the range of 300 kilometers is a bit short, it is enough for China. Moreover, the powerful load capacity can install many equipment in it, such as radar camera equipment. The radar equipment used by ordinary drones is only a few dozen kilograms, which means that it can not only detect but also carry more than 100 kilograms of weapons, with a speed of more than 470 kilometers per hour, which is faster than most helicopters today.

Xu Languo is younger than the other two old men, and is shorter in size, but looks very strong. If he doesn't look at his gray hair, just looking at his tendon flesh, he looks like a middle-aged man in his forties or fifties. He said, "Hehe, Brother Lu, since you have made this thing and are used as a gift for Luo Deliang, then don't keep it secret. Can you show us the test documents?"

Lu Xuan couldn't help but smile bitterly. Where did this thing come from? But since they asked, Lu Xuan certainly didn't have to keep it confidential. Although these things are advanced enough, these concepts have been proposed. Even when a verification machine is created, Lu Xuan is not afraid of throwing these things out.

"Of course there is this, in my assistant, if grandpa wants it..."

Although Lu Xuan does not have such data, this type of high-speed helicopter in the world matrix has conducted thousands of flight tests, and the data is extremely complete. Lu Xuan of course cannot hand over all these data, but only picked the typical data of hundreds of times, so that they can not only get what they need, but also understand Lu Xuan's painstaking efforts, and it is not too exaggerated.

When Mr. Luo heard this, he became anxious and said, "Xu Languo, this is my grandson-in-law's gift to me. Why are you joining in the fun?"

Xu Languo laughed and said, "Luo Deliang, you have retired, and it's useless to keep that thing. It's better to contribute to our Research Bureau!"

As soon as they said these words, the door was suddenly knocked open. A team of soldiers carrying live ammunition suddenly rushed in. Pangu immediately blocked in front of Lu Xuan. After checking around, he saw that the drone was as if it was a big enemy, and his muzzle was aimed at the drone and Pangu.

Most of their guards were soldiers eliminated from the special forces selection, and many of them were still willing to enter the special forces. They had an instinctive feeling about danger. In this room, except for their target, the drone, the most threatening one was of course Pangu.

The three old men looked at these people pointing at Pangu and Lu Xuan, and couldn't help but say angrily: "What are you doing?"

"Report, the company commander of the guard company, Bi Xueyin, reported to the three leaders that we developed a drone of unknown origin and rushed into the place, so come in and check!"

Luo Deliang said, "No need to check it. That's a gift from my grandson-in-law. Do you still have to seize us and confiscate the drone?"

"This...of course, no, we are just for the safety of the chief here!" Bi Xueyin muttered in his heart. He actually used a drone as a gift. This grandson-in-law's work is really not small. If this performance drone is placed internationally, it will be worth millions of dollars, which is more expensive than many luxury cars.

At this time, a middle-aged man in military uniform and carrying a major general's shoulder stamp pushed the door and entered. Although this man was over forty years old, his figure was very standard, and there was no sign of getting fat. He gave people the feeling that he was so energetic. He asked about the matter here first, and then said, "Okay, Lao Bi, there is nothing wrong here, you can go out to the table first? Brothers eat and drink well, don't say that he has treated you badly here!"

Of course, after this person was in trouble, Luo Dongping looked at Lu Xuan and smiled and said, "You are Xiao Lu. Although this is the first time I met, I am busy with things outside and I have neglected you. Don't mind!"

Lu Xuan smiled and said, "No, no, if you have something to do, just go and do it!"

Luo Dongping had a good impression of Lu Xuan. Although it was the first time we met, he was a little restrained. This restraint was not the kind of person who saw his own power, but because of the common sense of the son-in-law meeting his father-in-law. I heard that this kid had brought out a plasma generator and everyone from the National Security Bureau to mobilize him. It can be seen that this kid was really good at abilities.

"Dad! There is a banquet outside, so why don't you go out for a social event?" Luo Dongping turned his head and said to Luo Deliang.

Luo Deliang said impatiently: "What am I going to do? Your mother has already cooked the dishes here. I will join your mother, Mingzhu, Mingwei, Manzhu, Xiaolu and my old buddies here. This is called a family dinner. Apart from your old comrades, how many of them are sincerely coming to celebrate my birthday?"

The Luo family is indeed a big family, with three generations living together. This family atmosphere makes Lu Xuan feel strange and familiar. Luo Mingzhu's mother and grandmother stare at Lu Xuan at the dinner table. You know, the mother-in-law likes the son-in-law the more she sees her son-in-law, but this makes Lu Xuan feel stressed.

"Xiao Lu, we are all our own people. Since you and Mingzhu have established a relationship, we also need to know something about you. I wonder how Xiao Lu's family is like? What is your attitude towards your relationship?" Xu Manzhu said with a smile.

"I... I have no parents since I was a child. I heard from my raising man, Grandpa Du, that my parents used to be anti-drug police in Baoshan, Yunnan. Because my mother made a wish before she died and did not want me to live on the border, my father's comrades helped me move my household registration to Shanghai..."

Luo Deliang said: "It turned out to be the children of a martyr. Now the border is stable. Who knows how many good men are buried there? Lu Xuan, have a drink with us, even for your parents..."
Chapter completed!