S-91 Trenchant

Country:  United Kingdom

Class, [Type]: Trafalgar, [SSN].

Builder: Marconi Electronic Systems Naval Systems–VSEL, Barrow-in-Furness, U.K.

Launch date: 04 November 1986.

Commission date: 14 January 1989.

Decommission date: 22 May 2022.

Displacement ( tons ): 4.740 surfaced, 5.208 submerged.

Dimensions ( metres ): 85,38 x 9,83 x 8,25

Main machinery: 1 x Rolls-Royce pressurized-water PWR.1 reactor, 2 x W. H. Allen turbogenerator sets ( 15.000 hp ), diesel-electric emergency propulsion system with 2 x Paxman 400kw diesel generator sets.

Speed ( knots ): 30 submerged.

Complement: 130 ( 18 officers ).

Missiles:  SSM: UGM-84D-2 Harpoon, Tomahawk Block IV.

Torpedoes: 5 x 533mm. Spearfish and Tigerfish Mk 24 Mod. 2 torpedoes.

Mines: Can carry mines.

Radar: Navigation/Surface Search: 1 x Kelvin-Hughes Type 1007.

Sonar: Type 2020 MODEX bow MF active/passive array, Type 2007 passive flank array, Type 2019 PARIS acoustic intercept array, Type 2026 towed passive array, Type 2027 passive ranging, Type 2071 noise generator, Type 2077 active ice nav., Type 2008 underwater telephone, Type 197 echo sounder, Type 728 and Type 780 upward-looking echo sounders.

Countermeasures: Decoys: 4 x 102mm SSE Mk 8 decoy tubes (Type 2066 Bandfish and Type 2071 decoys); ECM/ESM: Thales UAP(1), EADS CXA(1) Telegon-6.

Callsign: GBNY ()

Comment: An improved version of the Swiftsure class. Suffered a minor steam leak in the reactor compartment at Lisbon in October 1998. Maximun diving depth is 590m. It is possible that this unit has been refitted and is able to launch, as other units of the class do, the UGM-109 Block III Tomahawk missile.

Homeport: Devonport.

Unit: 2nd Submarine Squadron.

Similar units:

 S88 Tireless