Allende-class frigate

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Fragatas en Tuxpam - panoramio cropped.jpg
All four frigates of the class at Tuxpan, 12 June 2009
Class overview
NameAllende class
Builders
OperatorsFlag of Mexico.svg  Mexican Navy
In commission1998–2016
Completed4
Laid up3
Retired1
General characteristics
TypeMulti-purpose anti-submarine frigate
Displacement
  • 3,011 long tons (3,059  t) standard
  • 4,260 long tons (4,328 t) full load
Length439 ft 6 in (133.96 m)
Beam46 ft 8 in (14.22 m)
Draught24 ft 8 in (7.52 m) max
Installed power2 × Combustion Engineering/Babcock & Wilcox boilers
Propulsion1 Westinghouse steam turbine 35,000 shp (26,000 kW)
Speed27 knots (50 km/h; 31 mph)
Range4,300  nmi (8,000 km; 4,900 mi) at 22 knots (41 km/h; 25 mph)
Complement288
Sensors and
processing systems
Armament
Aircraft carried1 MBB Bo 105 helicopter
Aviation facilitiesOne helicopter hangar and helipad
Notes Ex-Knox-class US ocean escort frigates

The Allende class is a series of four anti-submarine frigates used by the Mexican Navy. Allende-class frigates are former United States Navy Knox-class-ships which were acquired beginning in 1997. They form the Mexican Gulf Fleet of the Mexican Navy. They are used for anti-submarine and offshore patrol duties. All four ships were taken out of service by 2016 and one was sunk as an artificial reef in 2022. In 2024, it was announced the other three hulls would be donated for use as artificial reefs.

Contents

Description

The Allende-class frigates are former United States Navy Knox-class frigates. They have a standard displacement of 3,011 long tons (3,059  t ) and 4,260 long tons (4,328 t) at full load. The vessels measure 439 ft 6 in (133.96 m) long with a beam of 46 ft 8 in (14.22 m) and a maximum draught of 24 ft 8 in (7.52 m). The ships are propelled by a Westinghouse steam turbine rated at 35,000 shaft horsepower (26,000  kW ) turning one shaft using steam provided by two Combustion Engineering/Babcock & Wilcox boilers at a working pressure of 1,200  psi (8,300  kPa ) and a temperature of 950 °F (510 °C). This gives the frigates a maximum speed of 27 knots (50 km/h; 31 mph) and a range of 4,000  nmi (7,400 km; 4,600 mi) at 22 knots (41 km/h; 25 mph) on one boiler. The ships have a complement of 288 including 20 officers. [1]

The frigates are armed with a reduced version of their American layouts. They mount a single FMC 5-inch (127 mm)/54-caliber Mk 42 dual-purpose gun mounted forward. For anti-submarine warfare (ASW), the frigates are equipped with an ASROC Mk 16 octuple launcher with a reload system sited between the superstructure and the 5-inch gun. Two cells were re-configured to fire Harpoon surface-to-surface missiles in American service, but this ability was not transferred to the Mexican Navy. The Allende class also mounts two twin Mk 32 324 mm (12.8 in) torpedo launchers in fixed tubes for 22 Mk 46 torpedoes. The launchers are sited on the midships structure, angled outward at a 45° angle. Allende retains the Mk 25 launcher for the Sea Sparrow surface-to-air missiles that the vessels mounted in American service. [1]

The class is equipped with fixed Mk 36 SRBOC 6-barreled decoy launchers for infrared and chaff, SLQ-25 Nixie towed torpedo decoys and SLQ-32CV2 electronic support measures. They mount a Mk 68 Mod gunfire control system for the 5-inch guns, a Mk 114 Mod 6 control system for the ASW armament, a Mk 1 target designation and a MMS target acquisition system. For radar, the Allende class have SPS-40 air search and SPS-10 or SPS-67 surface search. The vessels are equipped with SPG-53D/F fire control radar and SRN-15A TACAN. The Allende class have a SQS-26CX bow-mounted sonar capable of active search and attack. The frigates have a helipad located over the stern of the ship and a hangar capable of storing the MBB Bo 105 helicopter that operates off the vessels. [1]

Ships in class

Allende class [1] [2]
Pennant No.Ship nameBuilderAcquiredCommissionedStatus
F 211 (ex-E 50) ARM Allende (ex-Stein) Lockheed Shipbuilding and Construction Company 29 January 199723 November 1998Decommissioned 2016, awaiting disposal [3]
F 212 (ex-E 51) ARM Abasolo (ex-Marvin Shields) Todd Shipyards Deliberately sunk off Tuxpan, 27 April 2022. [4]
F 213 (ex-E 52) ARM Victoria (ex-Pharris) Avondale Shipyards 2 February 200016 March 2000Decommissioned 2016, awaiting disposal [3]
F 214 ARM Mina (ex-Whipple)Todd ShipyardsAugust 20011 November 2002Decommissioned 2016, awaiting disposal [3]

Service history

The first two ships were acquired by the Mexican Navy on 29 January 1997 and underwent refits for Mexican service. Both ships were commissioned on 23 November 1988. The third ship was acquired in 2000 and the fourth in 2001. Mina is based at Manzanillo, the other three at Tampico. [1] Victoria commissioned on 16 March 2000 and Mina on 1 November 2002. [2] By 2016, all four ships had been taken out of service by the Mexican Navy. One, Abasalo, was sunk as an artifical reef 35 nautical miles (65 km; 40 mi) east of Tuxpan, Mexico. [4] The other three vessels were donated by the Mexican government for use as artificial reefs in 2024. [3]

Citations

  1. 1 2 3 4 5 Saunders 2004, p. 471.
  2. 1 2 Saunders 2009, p. 514.
  3. 1 2 3 4 "La Armada de México dona tres cascos de exfragatas para hundirlas en el Golfo" [The Mexican Navy donates three ex-frigate hulls to sink them in the Gulf]. Infodefensa (in Spanish). 9 February 2024. Retrieved 20 June 2024.
  4. 1 2 Perea, Gerardo (27 April 2022). "Hunden buque de guerra en costa de Tuxpan" [Warship sinks off the coast of Tuxpan]. Expreso de Tuxpan (in Spanish). Retrieved 20 June 2024.

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References

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