Open an aircraft carrier to fight against Japan

Weng Tonghe said quickly, "Tell me, what are the conditions?"

Lin Yuan smiled and said, "Didn't you tell the Holy Majesty that you want to retest my article? You just need to let the Holy Majesty forget about this matter, and I will help you get food for the victims."

Weng Tonghe thought for a while and asked, "Why did that old scholar surnamed Li say that he wrote your article?"

Lin Yuan thought: "You can't tell him the whole thing, it's better to hide something." So Lin Yuan said: "You really believe that old man, what if he is lying to you?"

Weng Tonghe didn't know who to trust for a while, so he could only say: "Leave this alone, I believe you are enough."

Lin Yuan came out, found Shen Wanqing, and asked, "Has anyone come to see you again recently?"

Shen Wanqing said: "Even if they come to look for me, I'm not afraid. I won't go out now. They won't find me at all."

Lin Yuan smiled and said, "How about I take you out to hide for a while?"

Shen Wanqing asked, "Where are you taking me?"

Lin Yuan said: "Shandong, Zhili and other places where locust plagues have occurred at the junction of the four provinces, and now they are facing a catastrophe. I will take you to find food."

Shen Wanqing asked, "Food? Where can we find food?"

Lin Yuan smiled and said, "You'll know when we arrive." The two set off overnight, and it was only at dawn that Shen Wanqing found out that they had arrived at Cangzhou Mansion.

The magistrate of Cangzhou Prefecture had never seen such a high-ranking official as Lin Yuan, so he quickly opened the door to greet him. Lin Yuan said, "Take us to the fishing village by the sea."

The magistrate hurriedly led the way and brought Lin Yuan and Shen Wanqing to a fishing village by the sea. Shen Wanqing asked, "Do you want to use the fish in the sea as food?"

Lin Yuan smiled and nodded. At this time, the magistrate interjected and said, "Lord Lin, please forgive me for talking too much. The fish caught by these fishermen are only enough to feed their families. If they catch more fish to feed others, I'm afraid they can't count on it!"

Lin Yuan didn't care, and said, "You don't need to worry about these things, go find the most experienced fishermen in the fishing village."

According to Lin Yuan's request, the magistrate found a few gray-haired old men. These old men were bent over and wore patched clothes. It was obvious that their families were very poor. Lin Yuan asked, "How many people can you capture in a day?" fish?"

A fisherman replied: "It's only less than twenty catties. If you remove the inedible things such as fish bones and internal organs, ten catties is not bad."

The magistrate frowned and asked, "Why so little!"

The fisherman replied: "My lord doesn't know something. The fish are all underwater. How can we know where they are in the water? We can only go to the places where there are a lot of fish to try our luck based on the experience handed down from our ancestors." , if you are lucky, you can catch more fish if you meet a school of fish, but if you are unlucky, you can only drink the northwest wind."

The magistrate said to Lin Yuan: "My lord, look, the younger ones say they can't catch many fish."

Lin Yuan told the fisherman: "It's morning, most of you probably haven't gone out to sea yet, go and organize them into a team, and I'll take you to catch fish."

The news of Lin Yuan's arrival had already been known by Li Zheng, the county magistrate under the prefect, so they were all near Lin Yuan and obeyed the arrangement. At this time, when they heard the order, they acted quickly, and immediately took hundreds of fishing boats from several nearby fishing villages. Gather up and sail away from the harbor mightily.

Lin Yuan and Shen Wanqing were in a separate cabin, and Shen Wanqing smiled and said, "I know what method you are going to use. You want to use the sonar on the Beijing ship to detect fish schools, right?"

Lin Yuan replied: "You guessed well, but I need you to mark the direction for me." He handed her a chart and a pencil.

Shen Wanqing marked their current location on the chart, Lin Yuan turned on the communicator and notified the Beijing ship.

According to the original plan, three helicopters took off from the Beijing ship, each carrying a towed sonar. The towed sonar is a type of sonar, but the installation method is different from the fixed sonar. The fixed sonar It is installed inside the hull, such as the bulbous bow widely used by modern warships, where the transmitting and receiving arrays of the sonar system are installed.

The towed sonar means that the sonar itself is in the sea and is fixed on the warship or helicopter by a tow cable, which can reduce the adverse effects of the noise of the warship or helicopter itself on the sonar.

The three helicopters detected fish schools near Lin Yuan from three directions. For the sonar operators on the helicopters, it was the first time to use sonar to find fish. In the past, sonar was used to detect enemy submarines and mines. Yes, but the principle of finding fish schools is the same as that of finding warships and submarines. Soon, obvious echoes appeared on the sonar echo display screen.

But the sonar operator can't directly and immediately determine whether it is a school of fish?Because he knew that these might also be reefs, he waited for a while to let the sonar system judge whether the target had speed.

Whether it is radar or sonar, the way to detect whether the target has speed is the Doppler effect, that is, when the wave source moves, the receiver will find that the frequency of the wave will change, and the operator will soon find the change in the echo frequency , he quickly contacted Lin Yuan: "Captain, I found a school of fish! The bearing is [-], and the distance is [-]."

For the convenience of indicating the orientation, the orientation of the fish school reported by the operator has been converted into the orientation relative to Lin Yuan, that is, the fish school is located in the 25th dense direction of Lin Yuan, and the distance is 8000 meters from zero point.

Shen Wanqing immediately marked the position of the fish school on the chart, and Lin Yuan immediately ordered the fleet to turn in the direction of the fish school. Fishing boats are powered by sails. The crew immediately adjusted the direction of the sails, and the fleet began to move towards the fish school. position travel.

Every 10 minutes, the operator will report the location of the fish school, which is convenient for Lin Yuan to track, but after 10 minutes, Shen Wanqing said: "There seems to be a problem."

Lin Yuan hurriedly looked over and asked, "What happened?"

The chart is full of grids, and each grid represents a certain distance, so the distance can be roughly inferred from the chart. Shen Wanqing said: "Although the distance shown on this chart is not very accurate, I can see it. The school of fish picked up speed."

Without Shen Wanqing saying much, Lin Yuan understood what she meant. The acceleration of the fish school meant that their speed would exceed the speed of the fishing boat, so no matter how much they chased, the fishing boat would not be able to catch up with the fish school.

The fishermen at this time did not know this situation, and their faces were filled with the joy of the harvest. These boats used towage when fishing, and they were fixed on the hull. The fishing boats dragged forward and collected the fish. into the middle.

But these drags are collected in the boat when they are not in use. The fishermen know that the fish school is ahead, and they all take them out and prepare to throw them into the sea.

But now the school of fish is about to flee at an accelerated rate, which will not only disappoint the fishermen, but also deal a devastating blow to Lin Yuan's plan. Lin Yuan did not expect that the school of fish would be faster than their fishing boat. He said to himself, "What should I do?"

At this time, the sonar operator on the helicopter also discovered this problem. In the communicator, he said anxiously: "Captain, what should we do? Or we can drop a few depth charges and kill all the fish." Bar."

Lin Yuan said: "This will definitely not work, how many fish can be killed by the power of depth charges!"

Shen Wanqing spoke at the side: "Why are we looking for fish schools? Why don't we let fish schools come to us?"