The first generation is a two-axis propulsion nuclear submarine with a traditional high-speed submarine. The Nautilus class, Sea Wolf class and Raya class built from 1955 to 1958 all belong to the first generation.
The second generation is a single-axis propulsion nuclear submarine with excellent underwater performance. The fish jumping classes built from 1959 to 196 1 belong to the second generation.
The third generation is developed from the second generation, and the bow of the boat is equipped with large sonar. Five categories, such as long-tailed sharks, white fish, sturgeons, narwhals and Lipscones, belong to the third generation.
The fourth generation is a large submarine, which is quiet and has a lot of displacement, but it can still sail at high speed underwater. This is the Los Angeles class that has been in service since 1967. American attack nuclear submarines in 2 1 century.
It has been 16 years since the first ship in Los Angeles came into service. The US Navy has started to build a new type of attack nuclear submarine, code-named SSN-2 1 Sea Wolf Class.
1989 10. The adoption of SSN-2 1 code means that this will be a 2 1 century submarine.
This submarine has an underwater speed of 35 knots. Due to the natural circulation reactor and electric propulsion, the quietness is much higher than that of Los Angeles, and the maximum diving depth is increased to 600 meters.
The hull is similar to a dolphin, with a smaller length and width and a narrower streamlined podium. The horizontal rudder is moved to the bow and embedded. Outside the propeller, a duct is covered to improve the wake and shield the noise of the propeller.
The diameter of torpedo tubes has increased from the traditional 533 mm to 660 mm (the outer diameter is 762 mm), and the number of tubes has also increased from 4 to 8. The purpose of increasing the diameter of torpedo tube is to enable MK-48 torpedo to launch by itself, so as to realize concealed launch, and new large-scale underwater weapons developed in the future can also be launched from this large-diameter launch tube.
Due to the increase of launch tube and rapid launch capability, this class boat is no longer equipped with special vertical launch tube.
Due to the above new measures, the underwater displacement is as high as 9 150 tons; The number of crew members is the same as that of Los Angeles. 133.
The sea wolf class belongs to the fourth generation attack nuclear submarine, but the cost is expensive. It is estimated that the total expenditure will reach 65.438+68.7 million US dollars. At present, with the end of the cold war era, national defense and military expenditure being cut, it is possible to build only one ship and stop to rebuild a cheaper one.