Hatsuyuki-class destroyer

Isoyuki
Class overview
Name:	Hatsuyuki class
Builders:	Hitachi Zosen Corporation IHI Corporation Sumitomo Heavy Industries Mitsubishi Heavy Industries Mitsui Engineering & Shipbuilding
Operators:	Japan Maritime Self-Defense Force
Preceded by:	Yamagumo class
Succeeded by:	Asagiri class
Built:	1979–1986
In commission:	1982–
Completed:	12
Active:	5 (2)
Retired:	7
General characteristics
Type:	Guided missile destroyer
Displacement:	3,050 long tons (3,099 t) standard 4,000 long tons (4,064 t) full
Length:	130 m (430 ft)
Beam:	13.6 m (44 ft 7 in)
Draft:	4.2 m (13 ft 9 in) 4.4 m (14 ft 5 in) (DD 129 to DD 132)
Propulsion:	2 × Kawasaki-Rolls-Royce Olympus TM3B gas turbines, 45,000 shp (34 MW) 2 × RR Type Kawasaki RM1C gas turbines, 9,900 shp (7.4 MW) 2 shafts, cp props
Speed:	30 knots (35 mph; 56 km/h)
Complement:	200
Sensors and processing systems:	OYQ-5 TDPS (w/ Link-14) OPS-14 Air search radar OPS-18 surface search radar OQS-4 hull sonar OQR-1 TACTASS
Electronic warfare & decoys:	NOLR-6C ESM system OLT-3 ECM system Mark 36 SRBOC
Armament:	1 × Otobreda 76 mm gun 2 × 20 mm Phalanx CIWS 2 × quad Harpoon SSM launchers RIM-7 Sea Sparrow SAM Mark 29 launcher ASROC anti-submarine rocket octuple launcher 2 × HOS-301 triple 324 mm (12.8 in) torpedo tubes
Aircraft carried:	1 × SH-60J(K) anti-submarine helicopter

The Hatsuyuki-class destroyer is a class of destroyer, serving with the Japan Maritime Self-Defense Force (JMSDF). It was the third generation of general purpose destroyers, though like its predecessor, the Yamagumo class, the main task is anti-submarine warfare. The class was completed between 1982 and 1987. Due to its size it would be more appropriately classed as a frigate.

This class is made a number of firsts among general purpose destroyers of the JMSDF.

It was the first class to use combined gas or gas (COGOG) propulsion system. The all-gas-turbine propulsion system is composed of two Kawasaki-Rolls-Royce Tyne RM1C gas turbines for cruising and two Kawasaki-Rolls-Royce Olympus TM3B gas turbines for high speed operation. The class introduced the concept of total ship systems engineering with an integrated combat system. The core of the combat system is the OYQ-5 Tactical Data Processing System (TDPS). The OYQ-5 TDPS is composed of one AN/UYK-20 computer and five OJ-194B workstations, and capable of receiving data automatically from other ships via Link-14 (STANAG 5514).

This is the first destroyer class in the JMSDF equipped with the Sea Sparrow Improved basic point defense missile system and Boeing Harpoon surface-to-surface missile system for AAW and ASuW respectively. The IBPDMS of this class uses FCS-2 fire-control systems of Japanese make and one Mk 29 octuple launcher at the afterdeck.

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