Asahi-class destroyer

Asahi-class destroyer
JS_Asahi(DD-119)_at_Mitsubishi_Heavy_Industries_Nagasaki_Shipyard_November_25,_2017_02.jpg JS Asahi (DD-119)
Class overview
Builders:	Mitsubishi Heavy Industries
Operators:	Japan Maritime Self-Defense Force
Preceded by:	Akizuki class
Cost:	DD119: JPY72.3 billion $893 million (constant 2009 USD)
Built:	2015–2019
In service:	2018-
In commission:	2018–
Building:	1
Planned:	2
Completed:	1
Active:	1
General characteristics
Type:	Guided missile destroyer
Displacement:	5100 tonnes standard 6800 tonnes full load
Length:	151 m (495 ft 5 in)
Beam:	18.3 m (60 ft 0 in)
Draft:	5.4 m (17 ft 9 in)
Depth:	10.9 m (35 ft 9 in)
Propulsion:	COGLAG, two shafts, two GE LM2500 turbines
Speed:	30 kn (56 km/h; 35 mph)
Complement:	230
Sensors and processing systems:	OYQ-13 ACDS FCS-3A AAW system OPY-1 AAW system OQQ-24 ASW system OQR-4 Towed sonar array system NOLQ-3D-2 EW system OPS-48 surface search radar
Armament:	Guns 1 × 127 mm (5 in)/62 gun Missiles 8 × Type 90 SSM 1 × Mk 41 VLS (32cells) RIM-162 ESSM SAM RUM-139 VL-ASROC Type 07 VL-ASROC CIWS 2 × 20 mm Phalanx Block1B CIWS Torpedoes 2 × HOS-303 triple 324 mm (12.8 in) torpedo tubes Anti-torpedo System
Aircraft carried:	1 × SH-60K helicopter

The Asahi-class destroyer is a destroyer class of the JMSDF - two ships are planned. The Asahi-class is optimized for undersea threats. This class used to be designated "25DD" - referring to a date on the Japanese calendar, specifically the 25th fiscal year of the Heisei period (2013). It is the third ship to hold the name after the Asahi-class destroyer escort lent from the US Navy in 1955, and the Imperial Japanese battleship. Shiranui is the third ship to hold the name after the Murakumo and Kagerō class destroyers.

Development

The procurement of the destroyer began in 2013 in response to the reduction in the number of destroyers (namely the Hatsuyuki-class) within the JMSDF. The two major characteristics of this destroyer is its bigger emphasis on anti-submarine warfare and the adoption of the COGLAG (combined gas turbine electric and gas turbine) propulsion system. A second destroyer was procured a year later.

Design

The Asahi-class is based on the existing Akizuki-class destroyer to reduce acquisition cost and allow future development and growth. Unlike the Akizuki-class (which focuses on anti-aircraft warfare) the Asahi-class focuses on anti-submarine warfare.

Features

The Asahi-class is the first Japanese warship to be equipped with a COGLAG propulsion system. This allows the destroyer to be more fuel efficient than previous warships. Another unique feature about this destroyer is the usage of a GaN-AESA (Gallium nitride - Active electronically scanned array) Multifunction Radar. According to Navy Recognition, to their knowledge the Asahi-class is the first Japanese and the world's second class of warship to be outfitted with this technology (the first being the German Baden-Württemberg-class frigate with their TRS-4D radar). The destroyer's radar is based on the FCS-3A radar used for the Akizuki-class but uses Gallium nitride to improve performance. In radar technology, Gallium nitride offers a number of advantages over the traditionally used Gallium arsenide (GaA). These advantages include higher power density, efficiency, thermal spreading and frequency coverage. This in turn allows the GaN chip to be smaller than their GaA counterpart, thus reducing cost and increasing overall cost effectiveness.

Ships in the class

Building no.	Pennant no.	Name/Namesake	Laid down	Launched	Commissioned	Shipyard
1613	DD-119	Asahi	4 August 2015	19 October 2016	7 March 2018	MHI, Nagasaki
1614	DD-120	Shiranui	20 May 2016	12 October 2017	March 2019	MHI, Nagasaki