"Twin machines start, advance one.**(..)" said Mustafa on the command tower.

The tr1700 submarine is equipped with four mtu diesel engines with a total power of 6720 horsepower, which are used to drive four generators and then drive a propeller at the tail through electric power. This is also the unique power combination method of the submarine.

Generally, warships directly use engines to drive the propeller at the tail, which has the highest mechanical efficiency. However, it is not appropriate for submarines to do this, because, except on the sea surface and at the depth of the snorkel, submarines need to sail underwater for the rest of the time. For ordinary diesel-electric submarines, underwater navigation can only rely on the battery packs at the bottom of the hull to provide electricity. The more batteries there are, the larger the capacity, the greater the self-sustaining force underwater. The displacement of tr1700 has enough space to accommodate eight battery packs composed of 120 units. Therefore, underwater self-sustaining force is also the largest. However, even so, underwater navigation can only last for a few days. If you advance at full speed of 25 knots, then in just one hour, all the power will be consumed.

Therefore, nuclear submarines are the king. With infinite endurance, they can stay underwater for a long time. The time they can persist depends entirely on the crew's own patience.

Diesel-electric submarines are not willing to fall behind and invented a variety of AIP submarines to help ordinary submarines achieve greater underwater navigation time.

Therefore, in order to achieve the common purpose, ordinary diesel submarines use diesel engines to drive the generator, and then use the generator's power to drive the motor at the tail. Moreover, this also has another use, which is that they can use the power emitted by the diesel engine while using excess power to charge the battery when the water surface or the depth of the ventilator.

Because when the battery is set off, the power of the battery is full, because the propeller efficiency is not high on the water surface, the maximum speed is only 15 knots, and because there are too many ships in the port, Mustafa only ordered the start of two diesel engines. This power is enough to drive the submarine to carry out its current navigation.

With Mustafa's order, the crew of the turbine began to start two diesel engines.

Large diesel engines and cars start differently. Cars rely on batteries to drive the motor. The motor drives the engine to reach a certain speed before starting. Even if large motors are made, there is no strong power to drive them. Therefore, large diesel engines are started by compressed air.**(..)

With the operation of the crew, through a set of air distribution system with complex pipelines, the compressed air is input into different cylinders according to the order of the piston movement, which promotes the piston movement, and the huge crankshaft rotates faster and faster. Finally, the speed requirement is met. Then the fuel injector begins to inject fuel and burns in the cylinder. The sound of the diesel engine is smooth and orderly, and it is finally started.

As an advanced diesel-electric submarine derived from the 209 submarine, reducing noise is a key point when designing. These four diesel generator sets are all arranged on double elastic cushions and fully enclosed management, making the noise emitted by the diesel engine unable to be transmitted. Even the Mustafa on the command tower can only hear a very tiny noise emitted by the diesel engine.

The large five-blade propeller at the tail began to rotate, and the surrounding sea water was stirred and converted into thrust on the propeller. The hull of more than 2,000 tons began to slowly start forward. This propeller was repeatedly designed, with a speed of only 200 revolutions per minute, which can effectively reduce noise.

"Left Ruler Three." Seeing that he left the berth, the captain gave the order again.

The faster the ship speed, the higher the efficiency of the rudder will be. At this time, the speed of the submarine is only a few knots. Therefore, the hull only slowly turns under the push of the tail rudder water flow.

In the east, a red sun has risen, and golden light has spread over the blue sea. There are ships everywhere, and they are sailing towards their destinations when they set out or arrive.

As for our side, this Iraqi Navy's current largest tonnage ship has begun to sail towards its destination, motherland, we are back!

There are many ships in the waters near this port. In order to avoid collisions with other ships, Mustafa set up a lookout post on the command tower. He took another breath of fresh air outside and walked along the ladder to the inside of the command tower.

Then, he heard a sonorous voice. Although he couldn't understand the words, he could also hear the dissatisfaction in his tone, because the other party was speaking German.

Leo, forty-one years old this year, is a German consultant hired by Iraqi high salary. After Leo graduated from the Submarine Academy with excellent grades, he served on several submarines and finally reached the position of captain. His father, once a captain of a German submarine during World War II, fought in the famous wolf pack tactics of the Atlantic Ocean for more than a year, and finally escaped the Allied attacks and returned to Germany safely. Leo was influenced by his father and had a deep understanding of the operation and tactics of the submarine. After retreating from his command position, he went to the Submarine Academy to teach. Iraq spent a lot of money and spent a lot of energy, and finally invited him to serve as the consultant of the submarine.

Luca, the German consultant of another submarine, was sent from a shipyard and knew all the technical issues of the entire submarine.

After listening to Leo's speech, a translator next to him began to translate Leo's words into Arabic: "Advisor Leo said that our submarine is about to enter the sea and conduct a voyage of more than 20 days. Is this the navigation plan you have formulated? You have been sailing on the sea and avoiding the main channel. You are submarine soldiers! As long as you go out to sea, you should hide yourself under the water. I feel embarrassed for you!"

Because the submarine is very automated, it greatly reduces the required personnel, so there is no need to be like other old submarines. Because there is not enough space, the bed is designed very tight. Three people sleep in one bed and work in three shifts. In this way, there are always people sleeping on the bed, so this kind of bed is called a hot shop. Now, more than 40 beds are designed on this submarine with more than 2,000 tons. In addition to being used by crew members, an additional team can be carried.

Now, in addition to Iraqi submarine soldiers, there are also German consultants and an interpreter equipped with German consultants.

After hearing what he translated, Mustafa frowned. This German consultant has always been very rigorous and serious. He has strictly required it in the previous few overseas trainings. It seems that this time is no exception.

However, in the past, the entire boat was only conducted near the port, but now, we have to operate this submarine and return to Iraq for a long-distance sailing. In order to avoid accidents in the middle of the journey, Navy Commander Nasser personally ordered to ensure safety.

You should know that although submarines have huge advantages in concealment, as submarine soldiers, the danger is also very huge. Once an accident occurs, other ships can be rescued by other ships. Once a submarine makes a mistake in operation, it is likely that it will become a living coffin for all members of the boat.

Therefore, for the safety of navigation, they made plans to sail from the sea before departure. Moreover, because in the vast sea, even if the submarine sailed on the water, they were not easily noticed by ships in the distance. In order to avoid collisions, they deliberately avoided the busy international routes, and as a result, the German consultant was very annoyed.

Seeing the captain come down, Leo continued: "Captain Mustafa, the submarine under our feet is for war. This long-distance sea navigation is a rare opportunity to practice. If we just return to Iraq from the sea, it would be a big waste. We are driving a submarine, not a freighter!"

When a foreigner said this, everyone could not hold their faces. As Iraqi naval soldiers and as soldiers of the great Lord Kusai, they were definitely not afraid of death, but the key is that the command of the Navy Command is like this.

Now that I have left the port and want to contact the headquarters, the communication tool used by the submarine is the long-wave radio station. This long-wave radio station has a narrow bandwidth, a small amount of information, and a long time. Therefore, in the future, communication satellites were used in large numbers. Moreover, because Iraq has just now owned a submarine force and the supporting long-wave radio stations are still under installation and commissioning, the captain has the final say in the situation at sea.

Everyone looked at the captain.

Mustafa was also hesitating in his heart. This was indeed a good opportunity. After the submarine returned to Iraq, many times, they would probably take it in the submarine base in the Persian Gulf. In the back garden of the Persian Gulf, there would be very few opportunities to navigate the ocean. This is a rare opportunity to train troops and an assessment of crew training over the past period of time. The Iraqi Navy is definitely not buying several submarines to fit, but for combat!

"Send a telegram to the headquarters, we will conduct adaptive training during the return journey, and we will definitely stay safe during the training." The captain issued an order.

Maybe it wasn't available at the base. The deputy captain was about to say it, but suddenly realized that the captain's idea was really good.

After contacting another submarine, the two submarines finally unified their operations and modified their previous plans. They will conduct a series of adaptive training during the return journey, including simple diving, floating, silent navigation underwater, and treating some passing ships on the waterway as imaginary enemies and practicing torpedo attack tactics.

Leaving the busy port, Mustafa issued the first combat command: "All personnel are in place, close all hatch doors, and prepare to dive." (To be continued...)
Chapter completed!