Full credit to Kerlon for the original Chevalier-class destroyer.

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The Tyrrhenian-class cruiser is a large guided missile cruiser in service with the Saltwater Navy. They are capable of operations as a part of a carrier group or alone, and serve as the flagships of the Carrier Battle Group escort fleets..

Development:

The Tyrrhenian-class was developed from the Chevalier-class destroyer, the licence for which had been purchased by the Saltwater government from United Arsenal. Five of these destroyers were originally planned to complement the Horizon-class destroyer in the air defence role. However, as the design was developed, it was realised that a much heavier armament was needed in order to give the Carrier Battle Groups a truly global reach. With this redesign came the addition of extensive command and control facilities, with an additional "Admiral's Bridge" being built into the superstructure, and the Rating's Mess being moved to a position between the funnels.

The first Tyrrhenian-class, the SWS Tyrrhenian, was completed in little over two years. In sea trials the ship excelled, and six months later was sent as part of the 1st Carrier Battle Group to the Pacific, conducting missile strikes against Japanese coastal defences and taking part in the sinking of the nuclear-powered battleship Yamato.

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Six ships of the class were built for the Saltwater Navy, with another ten later ordered for the Indonesian Navy. Each ship is projected to cost $1.5 billion. More recently, twenty more were ordered for the Halucian Navy in exchange for the return of sixty Eden-class frigates.

Design:

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At over 190 metres in length the Tyrrhenian-class is significantly larger than any other escort ship in the Saltwater fleet, and this allows the vessel to house 152 vertical launch systems. The VLS are a mixture of Sylver A70 and Scalpel-D VLS, and each cell can house Aster SAMs, Sea Ceptor, Perseus, Tomahawk, SPEAR-3, VL-ASROC and more. This means that the Tyrrhenian-class cruiser is able to serve in almost any role required of it, from air defence to land attack and anti-surface warfare.

The Tyrrhenian-class is propelled by four gas turbines driving two shafts, providing a total of 140,000 horsepower. They allow the ship to reach speeds of up to 33 knots. It can endure at sea for up to 45 days without resupply, with a crew of 470 men and officers.

For helicopter operations the Tyrrhenian-class has a helipad capable of supporting CH-47 Chinook helicopters, and has a hanger capable of housing up to two medium-lift helicopters, or three light utility helicopters. This is a modification from the original Chevalier-class, which has two separate hangers each housing a single helicopter.

The Tyrrhenian-class can carry four sea boats for anti-piracy and boarding operations.

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One feature of the Tyrrhenian-class is the installation of two Enforcer 76mm Advanced Gun Systems. These cannons can fire GPS-guided ammunition at a rate of fire of 45 rounds per minute, at a range of 40 kilometres. They can be used against shore targets, as well as aircraft (with laser-guided ammunition) and fast attack craft. They are supplemented by two Dragon LaWS (replacing the Enforcer LaWS of the Chevalier-class), each capable of destroying UAVs and cruise missiles at ranges of 12 kilometres, and a single Defender 30mm CIWS, capable of autonomous defence against most incoming targets at a range of 2 kilometres. A RIM-178 Arrowhead launcher is mounted forward of the bridge, and can be used against aircraft and fast attack craft, as well as supersonic cruise missiles.

The cruiser uses a modified Sea Viper air defence system, which is capable of providing guidance for up to sixteen surface to air missiles at once, and can track in excess of 1000 targets at a range of 400 kilometres. The primary radar is the AN/SPY-7, which can detect targets ranging from ballistic missiles to sea-skimming missiles. This radar also serves as the fire-control radar for the RIM-178 Arrowhead.

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Armament:

• x1 155mm naval gun, rate of fire 34rpm;

• x1 30mm Defender close in weapons system, 4400rpm;

• x1 RIM-178 Arrowhead close in weapons system, 18 missiles;

• x152 VLS cells with Sea Ceptor surface to air missiles, Aster 15 surface to air missiles, Aster 30 surface to air missiles, Perseus cruise missiles, SPEAR-3 cruise missiles and VL-ASROC anti-submarine missiles;

• x2 Enforcer 76mm Advanced Gun Systems, 45rpm;

• x2 Dragon LaWS, 110 kilowatts;

• x8 torpedo tubes.

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Electronic systems:

• AN/SPY-7 multipurpose radar;

• SwingScan search radar;

• Multiple IRST systems;

• Navigational radar;

• Missile early warning radar;

• Electronic countermeasures;

• Satcom, Datalink, radio, GPS and other antennas;

• Fixed and towed sonar;

• Torpedo decoys;

• Infra-red countermeasures;

• Chaff.

Specifications:

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Name: Tyrrhenian-class cruiser
Role( s ): Anti-submarine warfare, air defence, land attack, anti-surface warfare
Number built or under construction: 36
Crew: 470 + 34 air group
Maximum speed: 33 Knots ( 38mph, actual speed much more )
Builder: SMC Marine
Propulsion: Split shaft gas turbines
Operational ratius: 4300 nautical miles
Endurance: 45 days
Price per unit: 1.5 billion USD per unit
Project cost: 10 billion USD

Controls:

AG1 + VTOL + TRIM: 155mm Main Gun Turret control;
AG2/AG3 + VTOL + TRIM: CIWS control;
AG4/AG5 + VTOL + TRIM: 76mm Enforcer Gun System control;
AG6/AG7 + VTOL + TRIM: Dragon LaWS control;
AG8 + VTOL: Rotate torpedo launchers.
THROTTLE and YAW for movement.

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Notes:

• This build is obviously not to scale.

• Be careful not to shoot yourself with the CIWS systems or naval guns.

• The first twenty-four Perseus are the cruise missile variant, and last twenty-four are the anti-ship variant.

• Interceptor represents Aster 30 and Guardian represents Aster 15.