Project 15490 frigate

NWK, c.2020
Class overview
Name:	Project 15490 frigate
Operators:	Itayana Navy
Preceded by:	Project 15470 frigate
Succeeded by:	Project 16580 frigate
In service:	2014-present
Completed:	24
Active:	24
General characteristics
Type:	Frigate
Displacement:	5,200 tonnes
Length:	138.1m
Beam:	14.6m
Draught:	8.6m
Propulsion:	2-shaft COGAG IEP system: 2x cruise (14,000 kW each) + 2x boost (32,000 kW each) gas turbines 2x auxiliary steam generators (8,000 kW each) 4x auxiliary diesel generators (3,000 kW each.)
Speed:	+32kn
Range:	4,000 nautical miles at cruise turbines
Boats & landing craft carried:	2 Type 601 cutters or 4-6 RIB boats
Complement:	140
Sensors and processing systems:	Type 2152 L-band 3D air search radar Type 2420 S-band 3D radar Type 2425 X-band 3D radar Surface search suite: Type 1231 active search radar Type 1413 passive search radar Type 2677 gunnery radar Navigation radar Optronic suite Sonar suite: Hull-mounted sonar Towed array sonar
Armament:	2 missile mounts (8 missiles) 36 SAM VLS cells 1x1 130mm gun 3x1 76mm guns 6 25mm rotary automatic cannons 2x4 324mm torpedo tubes 2 24-barrel multi-purpose launchers
Aircraft carried:	2 helicopters

The Project 15490 also known as the ARS-class frigate is a class of frigates in service with the Unifying Navy. A development of the previous Project 15470 frigate, it shares the same hull and internal layout of the predecessor, while replacing the superstructure on the one with a lower radar cross section. Additional novations include integrated electric propulsion system and integrated tower mast carrying the radar equipment.

24 ships were reordered from the cancelled Project 15470 frigates; those were commissioned from 2014 to 2024. Further development of the strike frigates of the Unifying Navy focused on developing a newer, larger hull with more space for upgrades. Those efforts culminated in the Project 16580 frigate.

General characteristics

Project 15490 represents further development of the Project 15471 frigate employing more advanced technology being available at the time of its design and construction. It shares the same hull with its predecessor, being 138.1 meter long and 14.6 meters wide. However, the general layout was changed: notably, the ship lost the forward funnel and the rear communication tower. The remaining funnel was slightly enlarged, a small comm mast was transferred to its front. The class is distinguished by its massive 3D radar mast with various phased array antennas, and a low radar cross-section composite superstructure hiding boats, launch cranes, wing turrets and missile launchers.

The propulsion of the class was changed to a brand new integrated electric propulsion system, although it appears that the system was built into the existing Project 15471 power plant. Each shaft is propelled by an electric motor, powered by a set of a cruise turbine, a boost turbine and an auxiliary steam generator. Four diesel generators are available as a backup source of power. The turbines and generators installed on the class are of newer and more advanced designs compared to those mounted on 15471s. Maximal speed and range are claimed to remain as they were. Like its predecessor, the class is known to carry either two 12-meter Type 601 cutters or several (4-6) RIBs. Through extensive automation, the complement was reduced from 193 to 140, improving habitability.

The offensive weaponry of the Project 15490 remained the same as its predecessor, with two missile launcher mounts midships, but the class received a substantial increase in defensive armament. The number of surface-to-air VLS cells was increased to 48 by adding another 12-cell block, and it is known that a new long-range SAM was added to the armament from the onset. In terms of artillery, the ships retained the fore 130mm turret but the number of wing 76mm guns was reduced to two, hidden behind the mechanized doors. Another 76mm turret was mounted atop the hangar in lieu of the communication tower, apparently under the concerns that the mechanized doors would not be able to react in time. Manned open 25mm twin turrets were replaced with remote weapon stations with 25mm rotary guns; in addition to those, two more were added at the stern, below the helicopter deck. Twin 533mm torpedo tubes were replaced with quad 324mm ones, increasing the number of reloads and allowing unification of torpedo equipment throughout the Navy. Rocket bomb throwers were replaced by 24-barrel launchers, capable of firing rocket bombs, ECM projectiles or small short-range surface-to-air missiles. Two helicopters are housed in the hangar at the stern of the ship.

The electronic equipment on the project was completely overhauled, with separate pieces likely derived from various foreign designs. The class mounts an integrated radar mast with a 3D L-band air search radar, an X-band AESA radar with four arrays, and an S-band AESA radar with four more arrays below it. Additionally, the class received an anti-ship missile targeting complex with an active surface scan radar in the dome front of the integrated mast, and four passive detection arrays mounted below S-band arrays. A new fire control station with several optronic channels and an X/Ku gunnery radar was installed on a height behind the surface scan radar dome. The electronic countermeasures suite was replaced with a new model as well; it is mounted at the sides of the mast. The navigation, sonar and optronic suites remained unchanged compared to the predecessor.

The integrated radar tower is assumed to be partially derived from the one tested on Project 10705 frigates, and partially from other sources. Conversely, much of the equipment tested for the class was used in planning the mid-life upgrade for the preceding Project 15471 and other vessels of the Unifying Navy.

Ships of the class

Project 15491, Batch 1

Name	Translation	Shipyard	Laid down	Launched	Commissioned	Status
<name>	<Translation>	Shipbuilding Plant No.87	07.05.1998	25.10.1999	30.10.2000	Active
<name>	<Translation>	Shipbuilding Plant No.87	09.05.1998	27.10.1999	27.12.2000	Active
<name>	<Translation>	Shipbuilding Plant No.87	11.05.1998	29.10.1999	27.12.2000	Active
<name>	<Translation>	Shipbuilding Plant No.87	13.05.1998	31.10.1999	27.12.2000	Active
<name>	<Translation>	Shipbuilding Plant No.75	28.10.1999	15.03.2000	15.05.2001	Active
<name>	<Translation>	Shipbuilding Plant No.75	30.10.1999	17.03.2000	15.05.2001	Active
<name>	<Translation>	Shipbuilding Plant No.75	01.11.1999	19.03.2000	15.05.2001	Active
<name>	<Translation>	Shipbuilding Plant No.75	03.11.1999	21.03.2000	15.05.2001	Active

Project 15491, Batch 2

Name	Translation	Shipyard	Laid down	Launched	Commissioned	Status
<name>	<Translation>	Shipbuilding Plant No.87	05.04.2002	15.09.2004	25.03.2007	Active
<name>	<Translation>	Shipbuilding Plant No.87	06.04.2002	17.09.2004	27.04.2007	Active
<name>	<Translation>	Shipbuilding Plant No.87	19.01.2002	25.12.2004	03.07.2007	Active
<name>	<Translation>	Shipbuilding Plant No.87	18.02.2002	11.06.2005	21.09.2008	Active
<name>	<Translation>	Shipbuilding Plant No.75	23.02.2002	03.08.2004	13.05.2007	Active
<name>	<Translation>	Shipbuilding Plant No.75	26.03.2002	26.11.2005	04.06.2007	Active
<name>	<Translation>	Shipbuilding Plant No.75	22.04.2002	30.01.2006	10.08.2008	Active
<name>	<Translation>	Shipbuilding Plant No.75	12.05.2002	30.01.2006	12.10.2008	Active

Project 15491, Batch 3

Name	Translation	Shipyard	Laid down	Launched	Commissioned	Status
<name>	<Translation>	Shipbuilding Plant No.87	01.08.2008	15.09.2011	25.03.2014	Active
<name>	<Translation>	Shipbuilding Plant No.87	08.08.2008	20.09.2011	27.04.2014	Active
<name>	<Translation>	Shipbuilding Plant No.87	15.08.2008	25.09.2011	03.07.2014	Active
<name>	<Translation>	Shipbuilding Plant No.87	22.08.2008	11.10.2011	21.09.2014	Active
<name>	<Translation>	Shipbuilding Plant No.75	08.09.2008	03.09.2011	13.05.2014	Active
<name>	<Translation>	Shipbuilding Plant No.75	15.09.2008	26.09.2011	04.06.2014	Active
<name>	<Translation>	Shipbuilding Plant No.75	22.09.2008	10.10.2011	10.08.2014	Active
<name>	<Translation>	Shipbuilding Plant No.75	30.09.2008	24.10.2011	12.10.2014	Active