107 Chapter 107 (Revised)

Wang Xiaoyu controlled the drone to go around the ferry, 360 degrees of the entire ferry took pictures and videos, the entire ferry only has eight cabins, all of them are bungalows, except for the two people standing guard, everyone else is sleeping indoors, there is no secret whistle, it is estimated that it is a class. Five minutes later, the drone flew towards the summit position.

There is only one platoon of troops in the entire Shenliudu defense area to defend, because this is the rear, and there is no need for more manpower. There was only one squad, which was on duty at the ferry crossing by the river, and the main force was on the hilltop position, and they built two rows of barracks in the col behind the hilltop position. At this moment, the officer on duty received a call from the ferry port under the mountain: "Report, I am at the ferry post, I just heard a movement in the sky, a kind of wind sound that seems to be absent, but the searchlight has not found the situation."

The officer on duty surnamed Wu, a second lieutenant platoon leader, immediately raised his vigilance as soon as he heard that there was movement in the air, because it was reported that the civilian X armed forces had small drones, and two of them were shot down a few days ago, so he asked again: "Did you really hear any movement?" ”

On the phone, he replied, "It seems to be, but it doesn't seem to be, I can't be sure."

Platoon Commander Wu said angrily: "Didn't you observe the sky? What about low-light telescopes? What about searchlights? Didn't find anything? ”

On the phone, he said: "There are many insects in the grass on the riverside here, and the crickets and earthworms are so loud that we can't really hear it. ”

"No, what do you mean by calling?" Platoon Commander Wu asked angrily.

On the phone, he said: "Aren't you afraid of missing the situation, what if there is really a situation?" ”

Platoon Commander Wu said: "Okay, I know, you should strengthen your vigilance, don't doze off!" After saying that, he hung up the phone, thinking in his heart, those rabbit cubs have an opinion about the night shift, and deliberately called Lao Tzu in the middle of the night to get up and pee, right? Don't say anything! Thinking of this, I really felt a little anxious to urinate, pushed open the door, and came to the grass next to the barracks and began to release water.

He looked up at the sky, and it was really dark tonight, full of dark clouds, and there was no moonlight at all. Occasionally, in the gap between the dark clouds, a glimmer of starlight leaks to let people know that the sky is still there, and it has not turned into a black hole. Suddenly, a dark shadow floated through the gap in the dark clouds, and before it could be seen what it was, it melted into the darkness again.

Platoon Commander Wu scolded: "Hell yes." He was born and raised in the local area, and he knew that the sky here was not calm at night, there were night owls, owls, and bats chasing insects everywhere, but what was the black shadow that flew past just now? Most of the birds that fly at night are silent, which is really hard to judge. The problem is that the black shadow that flew over just now does not resemble the shape of a bird. Could it really be that the sentinel just reported, that kind of "if there is nothing" situation? Platoon Commander Wu shivered, and suddenly, he felt that his crotch was warm, and when he looked down, it turned out that due to his distraction, his crotch was wet and he didn't know it. Pulled up the trouser door, turned around and ran to the room, took out the shimmer telescope and searched the sky, but there was nothing in the sky!

He did not believe in evil, but closed his eyes and listened attentively. Because he knows that even if it is an electric drone, the sound of the propeller is quite loud in this silent night. There were crickets chirping, unknown insects squeaking, and the soldiers in the next room hearing their dreams, but there was really no sound in the sky, and so on, what sound seemed to be? The sound of the wind or the sound of a propeller? Can't tell. After listening to it for a while, it seems like there is nothing left. The officer was confused, could it be that this is the situation of the legendary "if there is nothing"? Do you want to report the situation as well? It made him entangled.

While the officer was struggling, the lights were shining brightly in the No. 2 tunnel of the Ziyan base. Huang Jiahao is taking a group of soldiers to modify the drone overnight, and some of them are replacing the motor, replacing the ordinary half-shaft motor with a full-shaft motor that runs through the motor, because he has tested it, and it can indeed greatly reduce the noise of the propeller. Some of them were weighing explosives and tying packs of 15 kilograms so that the drones could take off. In addition, some of them were tied into 8-kilogram packs, half of which were explosives, and the other half were steel balls and nails, which were used to enhance the killing effect. The TMT of a grenade is about 50 grams, and half of the TMT is put in an 8-kilogram explosive package, which is about 4KG, which is equivalent to 80 grenades. THOSE 16KG EXPLOSIVES PACKS WERE MAINLY USED TO DESTROY FORTIFICATIONS. Its explosive power is equivalent to 320 grenades, and ordinary surface fortifications cannot withstand it.

In another room in the tunnel, two beautiful female soldiers, Xiaohong and Xiaolan, graduates of the Department of Electronics, are soldering electronic components in front of the workbench. A few days ago, Little Red asked the girl about the air explosion fuse in order to make the explosive bag explode in the air. The foreign girl gave them detailed technical drawings, but unfortunately they couldn't make a radio rangefinder to control the height by themselves, and Wang Xiaoyu next to him said more: "Isn't there a laser rangefinder for decoration workers?" Dozens of yuan for 1, buy a few and come back to modify it to see if it's okay? A word woke up the dreamer, Xiaohong found an outdoor version of the infrared rangefinder that supports Bluetooth connection in a certain treasure, which is smaller than a cigarette case, and it is easy to get an air explosion fuse. At the moment, they are working overtime to refit in order to do more before the battle.

The two chatted while doing it, and Xiaolan asked Xiaohong: "Sister Hong, didn't you say that the space for the drone propeller is too small, and a short vacuum will be formed behind the propeller?" Increasing the number of blades of the propeller in that way will not help the lift, so why did Wang Xiaoyu change the 2-blade propeller to a three-bladed propeller? ”

"Because the resistance of a three-bladed propeller is greater than that of a two-blade propeller, a slower rotation speed can also provide more lift," Xiaohong said. The slower the rotation, the lower the noise of the propeller. Remember our last failure? A very important reason is that the propeller is too noisy and is discovered by the enemy. ”

"I can understand why he can use this kind of through-shaft motor, with two three-bladed paddles mounted on the upper and lower ends of the motor," Xiaolan said. Wouldn't it be more convenient to change to 6 leaf pulp directly? ”

Xiaohong said: "If you directly change to six-blade pulp, it will happen that the back paddle runs through the front paddle to form a vacuum, which reduces the efficiency." Wang Xiaoyu cleverly divided the six-bladed pulp into two layers, and the three-bladed paddle of the upper layer rotated to form a high-speed and high-pressure airflow, which blew onto the three-bladed paddle of the lower layer, which greatly improved the efficiency of the lower three-bladed paddle and greatly improved the power utilization rate of a motor. The little girl said that for the lower propeller, the upper propeller is like a turbocharger of a car, providing high-speed and high-pressure airflow to the lower propeller, which greatly improves the work efficiency of the lower propeller. In addition, we belong to the plateau area, and those blades use wider plateau propellers, which can further reduce the speed of the propeller, thereby reducing noise, and further improving the lift and range of the drone. Of course, these changes have to match the KV value of the motor, which is complicated to say. ”

Xiaolan said admiringly: "Sister Hong, we all graduated from the Department of Electronics, not majoring in aerodynamics, how do you know so much?" ”

Xiaohong said proudly: "I'm not afraid to tell you, the girl has been sleeping with me these days, and she told me all these twists and turns!" ”

Xiaolan stuck out her tongue and said, "She is a little girl, where did she come from to know so much?" ”

Xiaohong said: "The girl said that it was her master, and the one called Wang Xiaoyu taught her." So the little girl is impressive now. ”

Huang Jiahao happened to pass by, and also heard the conversation between the two of them, and couldn't help but interject: "A few words of that girl's words are true, do you believe it?" ”

Xiaohong said: "How is the effect, don't you also test fly in the afternoon?" Do you believe it or not? ”

Without waiting for Huang Jiahao to answer, Xiaolan said: "If you don't believe it, why did you take everyone to modify it overnight?" ”

Huang Jiahao was choked by the two female soldiers and couldn't speak, and saw a soldier buckle the direction of the propeller in reverse, and hurriedly went over to teach him a lesson: "Who is that, didn't you tell you, the direction of the propellers on a pair of shafts is opposite, why are you buckled in the same direction again?" It's only 12 o'clock and you're dozing off! ”