Chapter 1313： Advantages of AIP submarines (1/2)
The Stirling engine does not burn liquid fuel, but uses the helium stored in the tank to output power through a cycle of cooling, compression, heat absorption, and expansion. It does not need to be ignited, does not knock, and has equivalent noise. Low, almost the same as sailing with a battery.
At the same time, it does not directly drive the propeller at the tail, but drives a generator to power the entire boat, and at the same time power the motor at the tail to propel the submarine forward.
At this time, the Stirling engine is rotating at a slow speed, and the helium in the gas tank is constantly doing work. Until the helium is exhausted, then it can no longer sail like this. Generally speaking, that time is over. After a battle cruise, he returned to his home port.
”Accelerate to ten knots.” Shepke ordered.
When the Stirling engine is fully used, it can only reach a maximum speed of five knots, and now in order to speed up the navigation, they have begun to use the electricity of the precious battery.
This submarine is improved by adding cabins to an ordinary submarine. It retains the same battery as an ordinary submarine. When needed, it can also use battery power for quiet navigation.
The speed of the five-blade propeller at the tail has been increased, but compared to the previous three-blade propeller, the speed has been greatly reduced, which makes it cause less noise and is not easy to detect.
They were originally dangling near Sevastopol, only fifty nautical miles away from the port, but now, at a speed of ten knots, they can reach the port in five hours. If they catch up with the other side and stop in the port, the ambush is The easiest.
Below the command tower, the sonarman is listening carefully to the sound in the sea.
In recent years, German electronic technology has progressed rapidly. Thanks to the miniaturization brought by transistors, sonar machines have made great progress. Now, the sonar ball on the front of the ship's bow is receiving the surrounding clutter.
Listening in the clutter and discovering the opponent's surface ships and submarines is the task of sonar soldiers.
Time passed by little by little.
Shepke looked at his own chart, and the chief officer had already marked the trajectory on it. According to his own voyage, he would be able to reach Sevastopol in two hours.
At this moment, suddenly, the sonar's brows frowned. Among the murmurs, there was a completely different voice, high frequency, regularity, and rhythm. That was the noise of the propeller!
”I found the propeller noise, about twenty nautical miles away,” the sonarman said.
Twenty nautical miles away, that means that the other party has already begun to leave the port! Shepke felt that his adrenaline was secreting rapidly, and the special wet smell of diesel in the submarine made him feel so fresh.
”Rise to the depth of the periscope.” Shoopk shouted.
They had been sailing at a depth of about fifty meters just now, but now, the huge submarine began to slowly raise its head, and at the same time, on the control tower, a periscope slowly rose.
If it's other submarines, they must also raise the snorkel at this time and use a short time to charge the battery. Now, they just need to raise the periscope.
At a depth of ten meters, the submarine leveled, and Schepke pushed the periscope in front of him and put his eyes up.
The sonar of this era is not advanced enough to provide torpedoes with shooting elements. Attacks on enemy warships still rely on periscopes. At the same time, they also need periscopes to confirm their targets.