3d Sonar

Type 23 Frigates
Design
intended role
"The class frigate Type 23 was designed in the 1970s as an anti-submarine frigate light whose main role was to meet the Soviet threat and nuclear submarines in the North Atlantic. This new class is intended to replace the Leander class frigate, which was developed in the 1950s and the class frigate Type 21, developed in the 1960s, as the backbone of the force of Royal Navy surface ship anti-submarine . The Type 23 class frigate has not been acquired to replace the Type 22 frigate. "While reducing the size of the Navy following the 1998 review of strategic defense of the last of the 23s Type, St Albans does not replace a Type 22, the Coventry.
The ships were to carry a towed sonar to detect Soviet submarines in the North Atlantic and wear a Westland Lynx or Merlin helicopter EHI attack. It was initially proposed that the frigates not to get defensive armament. Instead the Sea Wolf missile system should be conducted by Oilers Fort Victoria class replenishment, one of which was to support generally four 23S Type. The forts also provide service facilities for helicopters of force would have Type 23 installations only to rearm and refuel.
Evolution
Following lessons learned from the Falklands War, the design has grown in size and complexity to include the vertical launch Sea Wolf (VLS) system with an additional monitoring system as a defense against aircraft flying at low altitude and sea-skimming anti-ship missiles such as Exocet. With the addition of surface to surface missiles, Harpoon and a medium caliber gun for naval gunfire support, the Type 23 has evolved into a more complex and balanced vessel designed for general war, which introduced a host of new technologies and concepts of the Royal Navy. These include extensive radar measures to reduce the design section, automation to reduce significantly the size of the crew, a propulsion system CODLAG (combined diesel-electric and gas) for providing very quiet operations anti-submarine with excellent range, technology and vertical launch missiles fully distributed combat management system.
The vertical launch system Sea Wolf missiles Surface to Air was designed and deployed on the Type 23. Unlike the Sea Wolf, the missile is reinforced vertically until it allows the super-structure of the ship and then turns to go directly to the target. Therefore, the structure of the vessel does not cause no-fire areas that would delay or inhibit the firing of missiles launched in a conventional system.
HMS Norfolk was the first class to enter service, operated in the fleet on 1 June 1990 at a cost of 135 449 000 GBP later vessels from 60 to 96 million pound cost.
Nomenclature
Although the Type 23 is officially "Duke" class and includes such famous names as HMS Iron Duke, (which was the name of the battleship HMS Iron Duke, Jellicoe's flagship at the Battle of Jutland), five names had already been used in classes known as "Class County: Kent and Norfolk have been given names for both guided-missile destroyers in 1960 and World War II heavy cruisers of the era, while the names of Monmouth, Lancaster, Kent and Argyll relaunched worn by the First World War-era cruisers. This use of the Doges and county names broke a tradition of names in alphabetical order for the escorts who ran into two - and not continuous - the cycles of the L-class destroyers from 1913 to the class destroyers Daring 1950, this growth has been relaunched with the names of the Amazon Class Type 21 frigates of 1972-75, and continued with B and C for most of the 22 frigates Type 1976-89. However, the D names have since been used for the new Type 45 Daring class destroyers now in service from 2009.
Characteristic
Type 23 of the helix, specifically designed to reduce underwater noise.
Weapon Systems
2 x quadruple Harpoon.