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:	General-purpose destroyer (DD)
Displacement:	2,950 tons standard, 4,000 tons hull load
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 × KHI-RR TM3B gas turbines, 45,000 shp (34 MW) 2 × KHI-RR 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 tactical data system FCS-2 fire-control system OPS-14 air search radar OPS-18 surface search radar OQS-4 hull sonar OQR-1 TASS (in some ships)
Electronic warfare & decoys:	NOLR-6C intercept OLT-3 jammer Mark 36 SRBOC Towed torpedo decoys
Armament:	1 × OTO Melara 76 mm gun 2 × 20 mm Phalanx CIWS 2 × Harpoon SSM quad canisters 1 × Sea Sparrow SAM octuple launcher 1 × ASROC octuple launcher 2 × triple 324 mm torpedo tubes
Aircraft carried:	1 × HSS-2B or SH-60J helicopter

The Hatsuyuki-class destroyer (はつゆき型護衛艦, Hatsuyuki-gata-goei-kan) is a class of destroyer, serving with the Japan Maritime Self-Defense Force (JMSDF). It was the first class of general-purpose destroyers of the first generation of the JMSDF.^[1]

Background

Destroyers of the JMSDF had been divided into two series, anti-aircraft gun fire oriented destroyers (DDA) and ASW-oriented destroyers (DDK). However, in the 1970s, a drastic review of the fleet became necessary due to the enhancement of the Soviet submarine fleet and the reinforcement of the anti-ship missiles. After consideration by Operations research, eight ships / eight helicopters concept was adopted as a new fleet organization. In this concept, each flotillas would be composed of one helicopter destroyer (DDH), five general-purpose destroyers (DD), and two guided missile destroyers (DDG).^[2]

General-purpose destroyers (汎用護衛艦, Hanyou-goei-kan) is a new type of destroyers for this concept, combines anti-aircraft capability like DDA and anti-submarine capability like DDK, and also capable of the operation of missiles and helicopters. And this was first class to be built as the first ships based on this concept.^[1]

Design

The hull structure was based on the shelter deck style adopted in the Isuzu class, and a long forecast style was adopted which truncated the rear end. The shape under the water line resembles JDS Amatsukaze. In order to reduce the noise, Prairie-Masker was installed after the 3rd ship and was also equipped with the 1st and 2nd ship at a later date.^[1]

From DD-129 onward, steel replaced aluminium for key elements of the superstructure including the bridge from the viewpoint of resistance and durability. However, due to this design change, the ballast had to be installed, the displacement increased and the movement performance was deteriorated.^[1]

It was the first class to use combined gas or gas (COGOG) propulsion system in the JMSDF. 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.^[1]

This combination and mounting method of these engines are similar to the Type 21 frigates of the British Royal Navy, so it was not possible to adopt an alternating engine room arrangement like a conventional JMSDF destroyer, the lack of redundancy was pointed out.^[1]

Equipment

The core of the combat system is the OYQ-5 Tactical Data Processing System (TDPS), 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).^[1]

This is the first destroyer class in the JMSDF equipped with the Sea Sparrow Improved basic point defense missile system. The IBPDMS of this class uses FCS-2 fire-control systems of Japanese make and one octuple launcher at the afterdeck. And in the JMSDF, OTO Melara 76 mm compact gun and Boeing Harpoon surface-to-surface missile are adopted from the ship of FY1977 including this class.^[1] Also, ships built in FY1979 and beyond carried Phalanx CIWS and were retrofitted to previous ships.^[3]

This class introduced the capability of shipboard helicopter operations. While the JMSDF already had the Haruna-class "helicopter destroyer", the Hatsuyuki class were the first air-capable general purpose destroyer class. Although it has a small aviation deck, through a beartrap system, the class can operate the Mitsubishi HSS-2B anti-submarine helicopter safely in a wider range of weather conditions. Later, HSS-2B was replaced by Mitsubishi SH-60J, but there was no room to install a large data link device for SH-60J, so a simplified type was installed.^[1]

Initially planned to carry out passive operation with sonobuoys laid by helicopters and towed array sonar (TASS) as sensors, but because development of TASS was delayed, it was retrofitted later on only four ships.^[1] OQS-4 hull sonar was Japanese equivalent of American AN/SQS-56, and OQR-1 TASS was of AN/SQR-19.^[3]

Ships in the class

References

External links

Media related to Hatsuyuki class destroyers at Wikimedia Commons

• JMSDF DD Hatsuyuki Class