Derived models of Los Angeles class nuclear submarines

According to the different construction years and improvements, the Los Angeles class is divided into three slightly different models. The following contents are mainly from P95-96 of Ship Knowledge Supplement 2009. * * * 3 1 ship.

SSN688 "Los Angeles" to SSN699 "Jacksonville", *** 12 ship, with surface/underwater displacement of 6080 tons /6927 tons;

SSN700 "Dallas" to SSN7 14 "Norfolk", *** 15 ships, with surface/underwater displacement of 6 130 tons/6,977 tons;

SSN7 15 "Bison" to SSN7 18 "Fire Slave Lu Lu badminton", ***4 ships, with surface/underwater displacement of 6 165 tons /70 12 tons. ***3 1 ship

SSN7 19 "Providence" to SSN725 "Helena", SSN750 "newport news", ***8 ships, with surface/underwater displacement of 6255 tons /7 102 tons;

SSN75 1 "San Juan" to SSN770 "Tucson", ***20 ships, with surface/underwater displacement of 6300 tons /7 147 tons;

SSN77 1 "Columbia" to SSN773 "Cheyenne" * * 3 ships, with surface/underwater displacement of 6330 tons /7 177 tons.

Among them, 23 SSN75 1 SSN773 are called 688-I nuclear submarines by the US Navy, which is an improved type, because there are great improvements in all aspects. This type improves the mute effect and modifies some hull designs of submarines.

The main differences between each type are as follows:

1, comprehensive performance

From SSN7 19 to SSN773, the second batch of L.A. class, due to the improvement of design, is equipped with 12 Tomahawk cruise missile vertical launcher in the pressure cabin between the bow spherical sonar and the pressure hull head of the 3 1 ship.

The first batch of pressure-resistant hulls were all made of HY-80 steel. The second batch of HY- 100 steel was used for the partial pressure hull of SSN753 and SSN754, which mainly accumulated experience for the subsequent SSN2 1 "Sea Wolf" class attack nuclear submarines using HY- 100 steel. In addition to the above two submarines, HY-80 steel was used for the rest of the second batch of submarines.

The bow of the second batch of 3 1 boats all uses FRP as the fairing of BQQ-5-A spherical sonar array. At the same time, these boats use 38D8Q diesel generator set and battery pack made by fairbanks-Morse Company as emergency backup auxiliary propulsion devices.

From SSN75 1 to SSN773, that is, model 688-I, the rudder of the command module is no longer arranged on both sides, but the retractable horizontal rudder of the bow is arranged on the head. In this way, Type 688-I has the ability to break the ice and float in the Arctic waters, so it is also called "polar nuclear submarine". In addition, all 23 boats are equipped with anechoic tiles, which reduces the underwater target strength of submarines.

2. Combat system

SSN75 1~SSN773, namely 668-I, ***23, is equipped with BSY- 1 operational command and control system.

SSN688~SSN699, * *12 ships are equipped with Mk 1 17+.

SSN688~SSN7 18, namely the first batch, ***3 1 ship, each ship can be equipped with eight Tomahawk cruise missiles launched from torpedo tubes.

SSN7 19~SSN773, the second batch, ***3 1 ship, equipped with 12 cruise missile vertical launcher, so * * * can be equipped with 20 Tomahawk cruise missiles.

SSN770 "Dallas" was converted from 1995 into a special nuclear submarine with dry deck device, which can transport SEALs or frogman transport planes and 20 SEALs and their corresponding complete sets of equipment. In addition, SSN688 "Los Angeles", SSN690 "Philadelphia" and SSN70 1 "La Jolla" were successively converted into this type of special nuclear submarines.

During the period from 1997 to 2005, according to the modification plan of the US military, other active nuclear submarines used commercial computer equipment to upgrade their sonar processing equipment. SSN75 1~SSN773, namely type 688-I, has been equipped with BQG-5A wide aperture passive side array sonar since around 2000.

In addition, the U.S. military also plans to modernize SSN72 1~SSN773, so that it can carry drones, launch improved Mk48ADCAP shallow water torpedoes, and equip it with the latest sonar system.

3. Test platform

SSN69 1 "Memphis" was converted into an experimental submarine in 1989, mainly engaged in composite material test, underwater unmanned vehicle test, advanced sonar test and hull drag reduction test. 1990, a turtle back structure made of glass fiber reinforced plastic is added behind the podium enclosure of the boat, which can accommodate several remote-controlled unmanned vehicles. In addition, "Turtle Back" is also equipped with a winch and drum for retracting and retracting the towed sonar array, so as to test the towed sonar array. SSN7 10 "Augusta" has been used as a test submarine for BQG-5G wide aperture passive side array sonar by the US military since July 1987. In addition, the boat and SSN724 Louisville were also used as test boats for BQQ- 10ARCI sonar. Sonar adopts commercial computer plug-in technology, which can be easily upgraded.

SSN773 "Cheyenne" was used as a submarine to test and develop the interactive sonar display technology based on the new flat panel display of commercial equipment.

SSN77 1 "Chicago" participated in the secret experiment beginning with 1996. At the depth of the underwater periscope, command and control a Predator-II unmanned reconnaissance plane to make its flying height 6 100 m and flying distance 100 nautical mile. SSN758 "Ashville" conducted a command and control test on the unmanned reconnaissance plane "Seeker at sea" at 1996+02. Since then, the U.S. Navy plans to use the submarine-launched Whaling Fork missile launcher on the L.A.-class submarine to launch the "Seeker at Sea" unmanned reconnaissance plane and conduct control and command underwater.

The shell of SSN758 "Ashville" is equipped with high-frequency active sonar for advanced mine detection system.