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Yahalom Class Corvette

PostPosted: Sat Nov 06, 2021 6:57 am
by Nachmere
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Type: Coastal Corvette

Dimensions
Displacement: 1200 tons (full load)
Length: 79 meters
Beam: 16 meters
Draft: 2.5 meters
Complement: 54

Propulsion
4 MMC MAD-V20-8000B Diesel engines (8200kW each)
4 MMC MAJ-6872 Water jets (15000kW each)
2 MMC MDG-5 270kW generators

Performance
Speed(max): 48 knots
Speed(cruise): 20 knots
Range: 3000 nautical miles at cruise speed

Sensors
SES RS-2258C "Daruch" AESA multipurpose radar
SES RS-1269 Surface Search Radar (navigation)
SES TCAPS-1 Towed Sonar Array
EO/IIR search and targeting system
Laser

Countermeasures
SES SEWS Electronic Warfare Suite
"Kaspit" Integrated Decoy System
“Tamnun” anti-torpedo torpedo

Communications and computing
"Mifras" Integrated Bridge System and FCS
BASTION II Battle Management System
Radio and Satellite external communications
Internal PA and radio communication systems.

Armament
32 cell Mk.13 tactical length VLS for a combination of Whipsnake Long Range SAM and Viper-5 SAM (fore)
16 cell Mk.13 self defense length VLS for Viper-5 (aft)
4x4 tube box launchers for Morena 5 AShM or Hammerhead Cruise Missile (mid)
1 Mk.5 76mm naval gun turret (fore)
1 Mk.8 20mm radar guided CIWS
2 2-tube 324mm torpedo launchers

Aviation Facilities
Flight deck for one helicopter (No hangar)

Cost: 250,000,000USD
DPR: 600,000,000USD



Following the Fatahland War, the Royal Navy set out to modernize its equipment and re-structure to better accommodate future needs. While force projection remained a priority, the need for defending Nachmerean trade and interests in sovereign waters, economic waters and in the open waters around Nachmere became apparent. The Royal Navy chose the Damballa class frigate to perform some of these operations, but still desired a vessel more focused on anti-surface and anti-air capability, to augment the routine and wartime defensive capability outside the carrier task forces. The Yahalom ("DIamond") class corvette was designed by Schwerpunkt to meet this requirement. The Yahalom is a small, relatively cheap coastal corvette emphasizing speed and lethality.

General Design

A small surface combatant, Yahalom displaces 1,200 tons fully loaded, and is 79m long.It is It is a wave piercing catamaran design, powered by diesel engines and propelled by water jets. This hull shape and propulsion combination gives the ship high speed, high maneuverability, and a shallow draft. The Yahalom is exceptionally heavily armed for its displacement, both in anti-ship and anti-air guided missiles, sacrificing range and the ability to hangar a helicopter (both deemed less important due to its coastal and near coastal role).
The ship is designed to have a reduced radar cross section, thanks to the lines of the hull and the integration of weapons as well as the use of composite and radar absorbing materials in its construction. To allow it to engage air, surface and submerged threats it is equipped with a powerful radar, advanced electro-optics and a capable towed sonar.

Propulsion

As mentioned, a main design emphasis in the design of the class was speed. For this purpose the Yahalom is propelled by 4 powerful water jets produced by the Mountain Motor Company. These 15000kW mixed-flow all duplex stainless steel water jets provide excellent propulsion and agile steering, essential to the fast attack operations the Yahalom was designed for. Powering the water jets are 4 MMC MAD-V20-8000B Diesel engines. The diesels are powerful enough to allow the jets to push the ship to 48 knots when needed, but also very economical to fuel, maintain and produce. At a cruise speed of 20 knots they allow the corvette a range of 3000 nautical miles, more than sufficient for a coastal oriented combatant. Two 270kW generators round up the ship’s power supply, used for emergency backup as well as fuel economy when the ship is stationary.

Sensors

The main sensor for the Yahalom class is the RS-2258C "Daruch" (“Vigilant”) S-band AESA radar. This lightweight rotating radar offers a 360 degree scanning field, with -20 to +70 degrees of elevation. The “Daruch” is a multipurpose, software defined radar capable of detecting, tracking and classifying both surface and air targets at a range of up to 200km, in very austere environments (littoral water, harsh weather, EW).The RS-2258 employes cutting edge ECCM to overcome jamming and spoofing attempts and is capable of cuing weapons as well as providing course corrections to missiles and splash identification and fire correction for naval guns. To augment the RS-2258C for navigation and close range scanning a smaller, RS-1269 surface search radar is installed.

In addition to the radars the ship is equipped with a state of the art electro optic system for both detecting and engaging targets. Mounted on the mast, in a 360 degree rotating stabilized gimbal. It includes a highly capable 1280X1024px thermal imager able to detect aircraft and ships at beyond visual range distances, as well as full high definition digital camera, and eyesafe laser rangefinder/designator. Thanks to the combination of an excellent thermal imager and camera this unit is operable in extremely adverse weather, through smoke etc. The electro-optics unit is capable of automated tracking of targets at high air speeds even at close range. The system can be used to cue both the ships missiles and the ships 76mm gun.

For ASW purposes, the Yahalom class is equipped with a towed sonar array, located in the rear of the ship under the helicopter pad. The TCAPS-1 is a compact and light towed sonar capable of simultaneous active and passive 360 degree detection and tracking of underwater objects and vessels. TCAPS-1 operates as deep as 220m, and has a detection range of up to 30km.

Armament

The Yahalom was designed primarily for anti-ship and air defense operations, but also has a land strike and anti-submarine capacity. The “Mifras” integrated bridge system receives and integrates data from the various sensors as well as theBASTION II network and integrates it to provide the bridge officers full situational awareness. “Mifras” also gives the bridge complete and fast control of the ship’s armament. This integration of communications, weapons and sensors allows Yahalom to quickly and decisively engage targets.

To engage surface, land and air targets the Yahalom is armed with a 76mm quick firing naval gun. The 76mm can fire up to 120 rounds per minute, to a range of 40km. The gun elevates from -15 to + 85 degrees and traverses through 360 degrees in 6 seconds. The gun can be directed using data from the main radar or the EO system, and is corrected for internal and external factors - roll of the ship, external temperature, ammo temperature, wind, coriolis effect, etc.

Providing the ship with an impressive air and missile defense are two VLS systems. In the fore section is a 32 cell Mk.13 system capable of launching Whipsnake and Viper-5 missiles. A further 16 Viper-5 missiles can be carried in a second system in the rear superstructure. These missiles, combined with the long range and advanced radar and EO, allow the Yahalom to engage manned and unmanned aircraft, cruise missiles and ballistic threats at a range of 1-200km and from sea skimming altitude to 55,000ft.

In the midsection of the ship, four 4 cell box launchers allow the corvette to carry a mix of sixteen Morena 5 AShMs or Hammerhead Cruise Missiles. These missiles provide the Yahalom with the ability to strike ships and ground targets at ranges of up to 350kM. The Morena is considered the main anti-ship armament for the Yahalom, but Hammerhead is more affordable and adds the land strike capability.

For anti-submarine warfare the ship is armed with two 2 tube launchers for 324mm torpedoes, one starboard and one portside in the rear superstructure.

The Mk.8 CIWS provides the Yahalom a last ditch defense against incoming threats. Guided by its own radar, the 6 barreled gun has a 4,500 rounds per minute rate of fire and can defeat incoming missiles at ranges of 0-1400m. It is automatically cued by the “Mifras” system.

Electronic Warfare and Countermeasures

Yahalom is equipped to identify and defeat electronic and kinetic threats. The SES SEWS electronic warfare suite includes radar and laser warning receivers to identify and jam or counter incoming emissions and munitions. The system is capable of identification and jamming or deception of multiple threats. SEWS uses advanced DRFM techniques and cutting edge power management to jam or spoof hostile ship, aircraft and missile radars. It employs several laser dazzlers to defeat incoming laser guided munitions.

SEWS is operated by a single crew member and is modular enabling expansion according to user requirements. It is seamlessly integrated with BASTION II and the ship’s sensors. If SEWS fails to defend the ship using radar or laser jamming/spoofing, the Yahalom will be defended by the “Kaspit” (Mercury) integrated decoy system. “Kaspit” is a launcher system capable of deploying various types of decoys quickly and according to the type of threat attacking the ship.

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The system comprises 4 360 degree rotating 40 barrel launchers for various decoys, connected to a computerized threat assessment and reaction system. The system is connected both to Mifras and BASTION II, and using the ships sensors allows the operator to deploy the optimal decoy at the optimal location.
Each launcher has 36 115mm tubes and 4 90mm tubes, allowing it to fire the following types of decoys:

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To defend the vessel against torpedoes, a "Tamnun" (Octupus) anti-torpedo torpedo launcher is mounted on either side. "Tamnun" launches a 200mm, 52kg countermeasure at incoming torpedoes, using data from the ship's towed sonar array. The countermeasure uses active homing to locate and attack the torpedo, detonating by proximity fuse and either damages its homing systems or utterly destroys it.

Aviation and boat facilities

The aft deck of the Yahalom is sufficient for landing a single medium maritime helicopter. Though the ship does not have a hangar, this was considered sufficient for coastal operation. In Nachmerean use the helicopter landing ability is used for resupply and for cooperation with land based ASW helicopters. The aft deck is also used to launch a single rigid hull inflatable boat, housed in the rear superstructure, along a crane for lowering and raising the boat.

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