Due to the limited budget, Chen Feng had to find those submarines before the 70s, and after excluding the submarines that did not meet the requirements, there were only 3 models left for Chen Feng to choose from. the other is the American Whitefish-class submarine; The last is the Soviet-made G-class conventionally powered ballistic missile submarine.

Of these three submarines, the German-made U-boat is the cheapest and the only one that has undergone long-term combat combat, with a displacement of 1,621 tons on the surface and 1,829 tons underwater. The maximum speed at the surface is 15.6 knots, and the maximum speed under water is 17.5 knots. The surface range is 11,150 nautical miles, and the underwater range is 285 nautical miles. The safe diving depth is 210 meters, the time to dive to the periscope depth is 25 seconds, it is equipped with 6 533mm torpedo tubes in the front, which can carry 23 torpedoes, and the submarine personnel are 64 people, including 6 officers, 24 non-commissioned officers, and 34 sailors.

Although this kind of submarine is still the previous torpedo submarine and its performance is backward, it has been tested in actual combat for a long time and has a good record. According to historical records, in October 1940, a "wolf pack" of 12 submarines sank 32 ships and was unharmed. By 1941, the total number of Allied ships sunk by German submarines had reached 1,150; By 1942 it had risen to 1,600 ships.

Even after 1943, the Allies installed anti-submarine radars on ships and aircraft, reducing the number of ships sunk by 65%, but in the whole of 1943-1944, the Allies still sank 200 ships. The most important thing is that this submarine is very cheap, and it only costs 400 points to redeem one. 12 ships as a group, exchange for a group and get an ammunition production line.

If you exchange three groups at a time, you will be giving away a submarine production line, with a monthly output of 30 submarines.

The Whitefish-class submarine is a product of the U.S. Navy, a conventionally powered submarine developed by the U.S. Navy and Ingalls Shipyard in the 1950s.

The 3.81cm thick HY-80 high-strength steel is used for the entire hull of the Whitefish, which gives the hull a minimum yield strength of 80,000 pounds per square inch, a general diving depth of 215 meters, and a maximum allowable diving depth of 320 meters. The submarine has a displacement of 1526 on the water. Underwater displacement 2414 tons. The length of the boat is 312 feet. The maximum speed at the surface is 20.25 knots, and the maximum speed under water is 8.75 knots. The power is twin-shaft diesel/electric propulsion, and the crew is 66, including 6 officers.

Whitefish-class submarines are armed with 1 4-inch deck gun. 1 40-mm gun. 2 .50 caliber machine guns. 10 533-mm torpedo tubes, 6 in the bow and 4 in the stern. It can carry 24 torpedoes. The exchange price is 1500 points for one ship, a group of 10 ships, and one ammo production line for one group. Exchange for 5 sets to get a production line with a monthly output of 20 submarines.

The G-class conventionally powered ballistic missile submarine is a product of the Soviet Navy, the first class ballistic missile submarine in the world, and the only first-class diesel-electric powered ballistic missile submarine in the world. The submarine has a displacement of 2,794 tons on the water, a displacement of 3,553 tons for submersible use, and an ultimate depth of 300 meters. The total length is 98.4 meters, and the total width is 8.2 meters. The power system is diesel-electric power with two-shaft propulsion. The speed is 12 knots on the water and 16 knots underwater. The hull structure is a double-hull, with a cruising range of 18,000 nautical miles / 10 knots, and an establishment of 80 seafarers.

The armament configuration of the G-class conventionally powered ballistic missile submarines includes missiles in addition to the usual torpedoes. A total of 6 533-mm torpedo tubes were equipped, 4 in the front and 2 in the rear. In addition, it is equipped with three P-13 ballistic missile launchers, which can carry three missiles at the same time.

The exchange price of the G-class conventionally powered ballistic missile submarine is very expensive, which is 6 times that of the German U-boat, reaching 2400 points for one group, a group of 10 ships, and a production line with a monthly output of 15 submarines for 5 groups.

If it is only applicable to the current war, then it is undoubtedly the most cost-effective to exchange for the new German U submarine, 100,000 points can be exchanged for 250 submarines, and you can also get dozens of submarine production lines, with a monthly output of hundreds of submarines, whether it is used on the occasion or directly packaged and sold, it is very cost-effective.

But Chen Feng also knew that this kind of submarine would soon become obsolete, and by 1943 the Allies would install anti-submarine radars on ships and aircraft, and this kind of noisy submarine was not as powerful as it was at the beginning, so the German U-boat could only be used temporarily, and it was quickly replaced after use.

And which of the latter two is different, the American Whitefish submarines were used until the end of the century through continuous improvement, and it was not until 1990 that they were all decommissioned from the combat sequence of the US Navy. The same goes for the Soviet Union's G-class conventionally powered ballistic missile submarines, which are among the most viable submarines.

After thinking about it again and again, Chen Feng decided to exchange a part of the three types of submarines, and at this stage, the German U-boat submarine will be used as the main submarine to win by quantity, but at the same time, it is also necessary to exchange a part of the submarines of the United States and the Soviet Union, and when the U-boat is decommissioned, it can be equipped with Whitefish submarines and G-class conventionally powered ballistic missile submarines on a large scale.

After calculation, Chen Feng believed that he could exchange 50 German U-boats, and then 20 Whitefish submarines and 20 G-class conventionally powered ballistic missile submarines. 90 submarines are enough to blockade the entire sea area around the South Ocean Territory, and these submarines alone are enough for the Japanese Navy to drink a pot.

After a whole day of calculation and analysis, Chen Feng finally determined how to allocate 920,000 system points, 1 battleship, 6 aircraft carriers, 10 missile cruisers, 15 destroyers, 20 frigates, and 90 submarines, a total of 141 ships.

At the same time, Chen Feng made a simple count of the strength of the refurbished navy, plus the 5 aircraft carriers, 3 battleships, 18 light and heavy cruisers, 18 destroyers and 29 frigates, plus 29 other ships and 8 submarines, the total number of naval ships in the Nanyang Territory is 251.

If all ships are fully equipped. Of course, this does not mean that the combat effectiveness of the Chinese Navy will be able to achieve overnight and become the most powerful navy in the world in a short period of time. What Chen Feng is most worried about now is whether he will be able to master these missile ships with the quality of the current officers and men of the navy, and how long it will take for them to develop combat effectiveness.

It is important to know that the officers and men of the Chinese Navy have basically not received an orthodox naval education, and in a popular phrase nowadays, they are all born with mud legs, even those high-ranking officers.

It is not enough to have no naval education, and the vast majority of soldiers are illiterate. This Nima's is difficult to do. At this time, Chen Feng really understood why the bigwigs of the previous Military Commission advocated it. Build literate troops.

For a person, it is terrible to be uneducated, and for an army, it is even more terrible to be uneducated. Chen Feng sometimes thinks now. Do you want to give the Navy an illiteracy sweep first? But I think those guys are in their twenties and thirties. It's hard to say whether you have the desire and motivation to learn.

But no matter what to do, first hand over the ship to the navy, it's a big deal to live in the navy for a while. Back to their practice, after all, Chen Feng is still relatively familiar with such things as missiles.

On May 25, 1941, Chen Feng ordered the Navy Command to immediately send a report to the three major fleets of the Navy, ordering all naval crews, including the Marine Corps. Naval aviation was immediately assembled, ready to receive new equipment.

Chang Zhiguo and the others were puzzled and did not dare to slack off, and immediately sounded the alarm bell of first-level combat readiness. For a time, all the troops in the entire Port Moresby Naval Base were urgently assembled, and all the commanders were in their positions, waiting for Chen Feng's order.

At 8:30 a.m., Chen Feng issued the first order, and all the officers and men of the navy, including the deputy commander and chief of staff of the navy, boarded the ship and headed for the Coral Sea in the South Pacific. At the same time, he demanded that the Navy and Air Force immediately provide him with a helicopter, that he personally go to the South Pacific to receive equipment, and that no one should accompany him.

Although Chang Zhiguo and others dissuaded him in many ways, Chen Feng was unmoved.

At 9:00 a.m., Chen Feng drove a Wuzhi-9 into the air and flew towards the South Pacific, and Chen Feng asked the fleet to arrive at the predetermined sea area in three hours.

At 11:00, Chen Feng arrived in the Coral Sea of the South Pacific Ocean, reconnoitred around, and found no ships nearby. Then Chen Feng opened the system interface and began to redeem the system.

"The host requests to exchange for an Iowa-class battleship, with a supporting ammunition production line, 10 base ammunition, and a cost of 33,000 points, please confirm!" The little fox's voice sounded in Chen Feng's mind.

"Confirm!"

"Please give the host a name to the ship!"

"The name of the ship is China! Are you sure! ”

"The exchange is successful, please check!"

Chen Feng saw a card suddenly appear in his personal warehouse, with a huge battleship printed on it. Chen Feng has encountered this situation many times, and he took out the card with ease, and then gently tore it and threw it to the sea. Then, a huge warship suddenly appeared on the surface of the Coral Sea.

"The host requests to exchange for 6 Forrestal-class main battle carriers, with 480 fighters, 6 supporting ammunition production lines, 10 base ammunition, and 2 super battleship docks, consuming 330,000 points, please confirm!" The little fox's voice sounded in Chen Feng's mind again.

"Confirm!"

"Please give the host a name to the ship!"

"The name of the ship is Saibei, Nanyang, Chahar, Suiyuan, Shanxi, Hebei! Are you sure! ”

"The exchange is successful, please check!"

In the same way, six large aircraft carriers were put on the runway of the sea, and soon six giant aircraft carriers suddenly appeared on the sea, which was spectacular.

With the aircraft carrier, Chen Feng no longer flew in the sky, landed the helicopter directly on the deck of the aircraft carrier, and then continued his great business of exchange.

"The host requests to exchange 5 Kara-class missile cruisers, 5 Lech-class missile cruisers, 5 supporting ammunition production lines each, 10 base ammunition consumption, 200,000 points, please confirm!"

"Confirm!"

"Please give the host a name to the ship!"

"The names of the ships are Sui, Baotou, Ulanqab, Xilin Gol, Hulunbuir, Yikezhao, Xing'an, Bayannur, Alxa, Chifeng! Are you sure! ”

"The exchange is successful, please check!"

(To be continued......)