FF(X)
Planned US Navy frigate class
From Wikipedia, the free encyclopedia
FF(X) is the designation for a class of frigates intended for the United States Navy based on the National Security Cutter (NSC) or Legend-class cutter in service with the United States Coast Guard.[4] The program was announced on December 19, 2025, and the ships will be built by Huntington Ingalls Industries.[5]
United States Navy (projected)Rendering of the FF(X) frigate, based on the Legend-class cutter | |
| Class overview | |
|---|---|
| Builders | Huntington Ingalls Industries[1] |
| Operators | United States Navy (projected) |
| Preceded by | Constellation class[2] |
| Planned | 50-65[3] |
| General characteristics | |
| Type | Frigate |
| Displacement | 4,750 tonnes (4,670 long tons; 5,240 short tons)[3] |
| Length | 421 feet (128 m)[3] |
| Beam | 54 feet (16 m)[3] |
| Draft | 22 feet (6.7 m)[3] |
| Speed | 28 knots (52 km/h; 32 mph)[3] |
| Range | 12,000 nautical miles (22,000 km; 14,000 mi)[3] |
| Complement | 148[3] |
| Sensors & processing systems | AN/SPS-77 3D air and surface search radar[3] |
| Electronic warfare & decoys |
|
| Armament |
|
Development
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On November 25, 2025, Secretary of the Navy John C. Phelan announced the cancellation of the Constellation-class frigate program beyond the first two ships, citing the need to build ships at a faster rate.[6]
The FF(X) program was announced on December 19, 2025, in social media posts by Phelan and Chief of Naval Operations Admiral Daryl Caudle.[5] The program's objective is to have the first ship in the water by 2028.[7]
Specifications of the planned ships were announced on January 16, 2026, at Surface Navy 2026’s Future Fleet Panel. 50-65 ships spanning multiple flights are planned to be constructed.[3] Modular construction across multiple shipyards is planned to expedite production of the class.[8]
US$242 million was allocated to the FF(X) program as part of the Fiscal Year 2026 defense appropriations legislation passed in February 2026.[9]
Design
The specifications of the FF(X) frigate differs from the preceding Constellation-class frigate.[10] The FF(X) will be a smaller and more agile warship that is capable of performing a range of missions and tasks.[11][12] Changes from the original NSC design include the construction of a platform above the stern boat deck for modular containerized payloads and unmanned systems.[7] In the FF(X) renderings, a "shelf" was added to the bottom front end of the superstructure, presumably a space for future upgrades such as vertical launching systems (VLS), laser-based directed energy weapons or some other close-in weapon systems.[13]
The initial flight of the class will be armed with a Mk 110 57 mm gun, a 30 mm gun, a Mk 49 launcher for 21 RIM-116 Rolling Airframe Missiles for point defense, and a flexible station at the stern of the ship for a variety of modular payloads, including up to 16 RGM-184A NSM anti-ship missiles or 48 AGM-114 Hellfire missiles for counter drone operations.[3] The initial flight will not feature an integrated VLS[14] or anti-submarine warfare equipment, though the latter may be added in the future.[5]
The FF(X) is similar to HI Industries' 2012 "Patrol Frigate" proposal, also based on the Legend-class hull, previously offered to the U.S. Navy as a replacement for the Littoral Combat Ship.[13] However, there are notable differences between the respective conceptual renderings, including variations in the size of the main superstructure and the gun turret.[13] Notably, the Patrol Frigate design incorporated a 12-cell Mk 56 VLS unit, a capability not included on Flight I ships of the FF(X). The Patrol Frigate concept also included an expanded sensor suite.[13]
See also
Equivalent modern general purpose frigates
- Defence and intervention frigate – (France)
- Mogami-class – (Japan)
- Type 31 class – (United Kingdom)
- Tamandaré class – (Brazil)
- Bhumibol Adulyadej-class – (Thailand)
- Istanbul-class – (Turkey)
- Thaon di Revel-class – (Italy)
- Nilgiri class – (India)