Anti-Submarine Task Force Flagship Challenge

[Soode]

Hasŏ Class Large Anti-Submarine Patrol Ship (DChD)
DChD-07 Chŏllo


DChD-07 Chŏllo, the second ship in the class, as she appeared at the start of the Second Pan-Septentrion War.

General Characteristics:
Type: Large Anti-Submarine Patrol Ship (Daehyŏng Dae-Jamsuham Chogyeham, DChD)
Displacement: 26,200 tonnes (full)
Length: 211.1 meters overall, 195.7 meters at waterline
Beam: 30 meters overall, 27.5 meters at waterline
Draught: 7.5 meters to keel, 10.5 meters inc. sonar bulge (full load)
Propulsion: CODAG with integrated electric propulsion
- 2x LM2500+G4 gas turbine generator, 34,700 kWe each
- 2x Taesan T16J diesel generator, 8,000 kWe each
- 4x Samsan 8EY26ALW diesel generator, 3,450 kWe each
- 2x 55,000 kW electric motor
Speed: 29.5 knots
Range: 13,000 nautical miles (24,000 km) at 16 knots
Complement:
- 52 officers
- 435 enlisted
Sensors and processing systems
- SMART-L MM/F air-search radar
- Thales NS100 air-search radar
- Nun-10 electro-optical sensor
- Ŭ-100D variable-depth sonar
- AN/SQR-19 towed sonar array
Electronic warfare and decoys:
- 4x Metturi EW suite
- 2x Baram-2 chaff/flare launcher
- 2x Manhwagyŏng-H torpedo countermeasure launcher
- 8x floating radar decoy ejector
Armament:
- Mark 41 vertical launching system (2x 8-cell self-defense-length module)
-- YDG-64 SAM, quadpacked
-- YDG-66 SAM, quadpacked
- 2x GBM-23/5 Bulkkot CIWS
- 2x2 350mm torpedo tube for YŎ-35/2 torpedo
- 8x GCh-75 12.7mm HMG (fitted for but not with)
Aircraft:
- 12x Gyundoan-Han GH-36N heavy ASW helicopter (pushrotor-driven)
- 3x Gyundoan-Han GH-28B medium AEW helicopter
- 2x Gyundoan-Han GH-28D search-and-rescue helicopter

Overview:
The Hasŏ-class cruisers are a group of three large helicopter carriers in service with the Menghean Navy. They are formally designated as "large anti-submarine patrol ships" (Menghean: 대형 대잠수함 초계함 / 大型對潛水艦哨戒艦, Daehyŏng Daejamsuham Chogyeham), but in Anglian language literature they are typically referred to as cruisers or helicopter carriers due to their large air wing. They specialize in the anti-submarine role, with an advanced hull sonar and variable-depth sonar, and are also armed for self-defense against submarine-launched anti-ship missiles.

The unique design of the Hasŏ class makes a number of design compromises, all of which are entirely deliberate.

The enclosed superstructure allows seven additional helicopters to be carried, five inside the deck-level parking area and two on the lowered elevators, without resorting to deck spotting, which could complicate maintenance in the stormy, tropical waters where these ships were deemed likely to operate. The double-ended flight deck permits a higher sortie rate than a single large flight deck aft, especially when a third of the air wing is deployed; in this condition, standard procedure is to land helicopters on the aft deck and take off from the forward one, maximizing efficiency. A single, large flight deck would allow more helicopters to land or take off at once, but the Menghean Navy deemed that the double-ended style was adequate for constant-cycling ASW patrol operations.

The armament of the Hasŏ class is purely defensive. Four 350mm torpedo tubes are embedded in the stern; these fire the same YŎ-35/2 torpedo used by the ship's air wing. The starboard-side superstructure extension contains 16 self-defense-length Mk41 VLS cells in two 8-cell modules, and these are loaded with quadpacked YDG-64 or YDG-66 missile canisters for a total of 64 short-range surface-to-air missiles, a robust line of defense against anti-ship missiles launched from submarines or multirole aircraft. Two CIWS installations, one forward and one aft, provide 360-degree coverage. No other missile armament is carried. The Menghean Navy conceived of the Hasŏ-class ships as rear-area combatants, tasked with patrolling waters which are outside the reach of enemy carrier battle groups and land-based fighters but potentially infiltrated by enemy submarines. In this role, cruise missiles, heavy anti-ship missiles, and long-range surface-to-air missiles would be superfluous. Typically, a frigate in the ASW battle group remains near the Hasŏ-class ship to provide limited long-range SAM cover and fire rocket-deployed torpedoes.

In addition to conducting ASW patrols, the Hasŏ-class DChD is meant to serve as the flagship of an anti-submarine battle group typically comprised of itself, one destroyer, one frigate, 4-6 corvettes, two long-range acoustic surveillance ships, and one underway replenishment ship, which cycles back and forth between the patrol area and a friendly port, usually with one corvette as its escort. The DChD has onboard flag facilities to host the officer (usually a Rear Admiral) commanding the formation, and to coordinate anti-submarine operations over a wide area. It also has liquid UNREP delivery equipment to top off the fuel tanks of other corvettes in the formation, especially if they expended fuel pursuing a threat. For underway delivery of passengers and dry cargo, the Hasŏ-class DChD would rely on helicopter VERTREP, though most dry cargo replenishment would await the arrival of the dedicated replenishment ship.

Finally, the design of the Hasŏ-class DChD puts a significant emphasis on survivability. The hull is divided into nine watertight segments, each one separated from the next by a double-skinned bulkhead packed with fragment-absorbing material. The electric drive motors are split across two such compartments--one aft of the aft elevator, one aft of the forward elevator--so that the ship can cruise at half power if either compartment is damaged. The generator sets are even more dispersed: the diesel gensets are distributed across four compartments, with small emergency generators in two more, and the gas turbine generators are located in the superstructure, which also reduces the space reserved for exhaust and ventilation and leaves them entirely immune to flooding. The fully electric propulsion system also reduces the ship's acoustic signature, especially when only running the gas turbine generators in the superstructure. Five belts along the hull further mask machinery noise by deploying curtains of air bubbles, as do holes along the edges of the propeller blades.

Ships in the class:
All four Hasŏ-class cruisers are named for Menghean provinces. This is a new naming convention in the Menghean Navy, though it does echo the naming of the Chanjok Jachido-class cruisers, which were named for Menghean Semi-Autonomous Provinces. While the Chŏllo plain is divided into two provinces, North Chŏllo and South Chŏllo, the second ship in the class is simply named Chŏllo, in reference to the entire region.

When the Second Pan-Septentrion War broke out in April 2022, three Hasŏ-class cruisers were in service, and a fourth was being fitted out. All were built at the Songsu-do Naval Yard in the city of Gyŏngsan.

• DChD-06 Hasŏ: laid down 2016-02-17, launched 2017-12-06, commissioned 2019-12-19
• DChD-07 Chŏllo: laid down 2016-11-18, launched 2018-09-30, commissioned 2020-07-18
• DChD-08 Unsan: laid down 2017-12-09, launched 2019-11-04, commissioned 2021-09-18
• DChD-09 Songgang: laid down 2018-10-03, launched 2020-08-30, commissioning planned for late 2022

[odysseus1980]

That's a really cool ship.

[Soode]

That's a really cool ship.

Thanks! It's definitely one of the more "original" concepts I've made, loosely inspired by one of the Hyuuga preliminary designs but modified to the point of losing all resemblance.

[mcas1987]

That's a really cool ship.

Thanks! It's definitely one of the more "original" concepts I've made, loosely inspired by one of the Hyuuga preliminary designs but modified to the point of losing all resemblance.

I really like your designs fyi. I'm totally stealing this for a fictional nation project of my own.

[Zerin]

Anfallare class DDG
DDG-170 Anfallare


Depicted is the Anfallare herself with her "Fresh Ship" Pain scheme. A Dark blue-gray that is the traditional paint scheme for freshly commissioned ships to wear until their first lengthy maintenance period or overhaul.

Basic Background Information:
The Norden Defense Force Navy's Mass Production Destroyer program has finally been brought to fruition with the Anfallare class Destroyer. Designed to bring enhanced AAW and Command capabilities to the NDFN's ASW Frigate Flotillas without sacrificing it's Destroyer Escorts meant for Carrier Task Forces nor the Large Destroyers that form the backbone of Surface Action Groups. The Anfallare class brings lessons learned from the Yormungandir Batch III, Mjolnir, and Harbinger class Destroyers as well as technologies introduced in succession across said platforms to create a Destroyer with tested advanced technologies that can be mass produced in needed numbers. The NDFN had come to the conclusion that 30 destroyers oof the Anfallare Design would be required to finally solidify the backbone of it's ASW task forces. However with it's main mission of AAW it is capable of being moved into other positions in other task groups. It's focus on Command and Control will alleviate the strains that current ASW Frigate Flotillas endure.

[heuhen]

is there any propulsion system on that one. or just magic

[Armoured man]

I could be wrong but I think it has some kind of water jet propulsion, judging by that weird looking device where the propellers should be

[thegrumpykestrel]

Please forgive me for making one of my prettiest designs ugly

HMWS Westralia

In the mid-1960s, the Royal Westralian Navy began the process of instigating its first major force restructure since the late 1940s. Since the last restructure, technology had changed warfare dramatically, and the RWN was rapidly finding its surface combatants increasingly obsolete in the face of increasingly lethal submarines and supersonic aircraft. With Soviet Russia increasing its presence in the area, sending vessels to the Indian Ocean on a more frequent basis, the RWN needed to find a modernisation solution fast.
It was decided that the combatant force would become focused into an Anti-Submarine force, capable of hunting down enemy submarines whilst protecting itself from air attack. By the time the restructure would be complete, the force was intended to be composed of 6 new frigates, 2 destroyers and a task force flagship. Whilst it was intended to manufacture a new purpose-built light helicopter carrier following the completion of the frigates, a flagship would be required in the interim.

Fortunately, the RWN already had a suitable vessel to employ in the flagship role, the all-gun heavy cruiser HMWS Westralia. With the threat of the Indonesian KRI Irian Sverdlov-class cruiser having been overstated (by some accounts already having been converted to a barracks ship), the Westralia had found itself without much of a purpose and sorely obsolete. Since 1964, it had been decided she was to be retired in the coming years and had rarely left port. However, the restructure offered her a new reprieve, and an extensive refit and reconstruction was planned that would make her the centrepiece of the new fleet. In 1966, she was removed from service and dry-docked in Henderson, where she was effectively stripped down to a hulk and built back up again over the following years.
The entirety of the ships existing gun armament was landed; and a new elongated superstructure was built along with a large mid-ships deckhouse, hangar capable of taking up to 4 Sea King helicopters (though in service this was found difficult to use, and only 3 would ever be carried) and sizeable flight deck. Armament comprised a single Mk42 5-inch gun, a Mk10 GMLS Terrier launcher, twin Ikara launchers (magazine housed in the new deckhouse) and 2 Mk32 SVTTs torpedo launchers. New masts were built expanding upon the old ones, making space for SPS-40, SPS-52 and SPS-10 radar sets, along with new electronic and communications fitments. An SQS-23 sonar was hull-mounted.

The refit, whilst thoroughly modernising the ship, went significantly over time and budget, and was negatively received by the public, being seen as the RWN’s big white-elephant. Ultimately, these problems led to the cancellation of any future helicopter carrier design and constructions. HMWS Westralia finally re-entered service in 1972 and proved to be a mix bag in service. Whilst she was functional as a flagship, in the anti-submarine role the ship had some major short-comings; being overly noisy and a less than ideal helicopter platform, especially with compromises made with the hangar size. In the anti-air warfare role she served much better, providing an effective blanket of protection to the spread out task force. By the 1980s, Westralia was beginning to show her age, especially in regard to her steam propulsion which was showing significant signs of wear. Simultaneously, the RWN was beginning to face a manpower shortage and a reduction in funding. As such, it was decided that the RWN was to undergo a force reduction and restructure, with HMWS Westralia to be retired and two of the frigates sold off. In March 1982, 28 years since her first commissioning, Westralia was decommissioned at HMWS Swordsman, putting to a close the operation of cruisers by the Royal Westralian Navy.



General Characteristics
Displacement: 13,580 tons
Length: 194m
Beam: 20.26m
Draught: 7.62m
Speed: 30kts
Range: 7800nmi
Installed power: 95,000shp
Propulsion Machinery: 2x Steam Turbine, 4 x Boiler
Complement: 785
Sensors and Systems:
SPS-40, SPS-52, SPS-10, SPG-55 Tracking/Illumination Radar, SPG-53 Gun Fire Control Radar, Ikara Command Datalink
Armament: Mk42 127mm Gun, Mk10 Guided Missile Launcher System firing RIM-7 Terrier, 2 x Ikara, 2 x Mk32 SVTT firing Mk46 Torpedo
Aircraft: 3 x Westland Sea King HAS.1

[acelanceloet]

CLK-3 Guadalcanal class
The Guadalcanal class were the centerpiece of the Connected ASW Fleet.They carried a flag plot, command staff, a layered ASW attack system and various datalink and communication systems. More information about the Connected ASW Fleet on the shipbucket wiki here

The ships design was initially based on that of the Spruance class. The original concept replaced the forward gun, the Mk 4 AWHS and the Mk 16 launcher with a VLS launched STAM missile. This missile would give these ships over the horizon anti-sub and anti-ship abilities by attaching an medium sized torpedo to an high-subsonic missile, giving the torpedo a range of over 300 nautical miles. The VLS proposed would end up far larger then the Mk 4 AWHS it would replace, even if only a few missiles would be shipped. The point could be made that this VLS would even be too substantial to fit it on any surface warship. Instead, it was proposed to fire the missile from an existing launch system: while the magazine wasn't suitable, the launcher developed for the Talos missile would fit a modified STAM.

The resulting design did not suit the navy well: when separated from it's 'cheap fleet', for example in peacetime operations, the ship would be less capable but more expensive to operate compared with an Spruance. So it was modified: in peacetime the ship would be able to perform the tasks of a flag ship Spruance while in a large scale conflict, the USN would use these ships to their full potential, with increased command staff, full helicopter load and effective use of the STAM missile. The resulting ship was a good bit bigger then the Spruance it was based on, but shared many parts and design aspects. 4 of these ships were initially build, named for notable escort carriers in WW2.

Dimensions
• WL Length: 580 ft
• Beam: 63 ft
Propulsion
• 4 General Electric LM2500 gas turbines, 2 shafts, 80,000 shp (60 MW)
• Top speed: 31 knots
• Range: 8000 nautical miles at 20 knots
• Range: 3300 nautical miles at 30 knots.
Armament
• Twin launcher for STAM missile, 24 reloads
• Mk 16 Box launcher for ASROC, 8 in launcher, 16 reloads
• Mk 42 5/54 gun
• Mk 29 launcher for Sea Sparrow, 8 in launcher
• 2 Mk 144 launchers for Harpoon, 4 in launcher
• 2 Mk 32 SVTT for Mk 46 torpedo, 3 in launchers, 20 reloads.
• 2 SH-3 or 4 SH-2 helicopters.
Sensors
• AN/SQS-53 sonar
• AN/SQS-19 TACTAS towed array
• AN/SPS-40 air search radar
• Mk 86 GFCS
• Mk 95 Sea Sparrow guidance radar
Other equipment
• NTDS
• AN/SLQ-32

[Charguizard]

The Anchorage-class Aircraft Carriers were authorized in 1975 to replace all Second World War era carriers still in service. Congress authorized 3 ships with the caveat that the ship should be "no larger than the largest previous class in the Navy", which was conveniently nudged to mean as long as Lexington CV-2. Lady Lex edged on 46,000t full load by the end of the war, and this was taken as the "standard" displacement for the new carrier. She was designed from the offset to both be cheap and easily adaptable to different roles. In cutting costs, only an 82RS12 S-band 3D radar was shipped instead of the usual 3D S-band + 2D L/P-band combination. No sonar was provided and targetting for the RMT-3 missile was done by the embarked helicopters or the escorts. Only 3 directors were provided for the GIR-7 short range point defence missile. Space was provided for service vans to board and serve as maintenance lockers for the embarked air wings. The class was powered by four FT4G gas turbines, and two CTF16M32A diesel engines, totalling 152,000 shp at maximum power for 31 knots on trials. Transmission was electric, allowing the engines to be acoustically isolated. Range was 10,000 nmi at 25 knots on two turbines and two diesel engines. Displacement ended up at 51,000t normal and 56,000t at full load.

CV-15 Lexington is seen here during Western Alliance Exercise HONEST LEAP '85, embarking a mixed ASW wing of 20 ASW helicopters, 5 AEW aircraft, 3 SAR helicopters and 20 fighter-bombers from 3 different squadrons.