Upholder class submarine

HMS Unseen (S41) passing by Bangor, Pacifica en route to Vancouver, British Columbia on October 1st, 2004.

The Upholder-class, also known as the Type 2400 (due to their displacement of 2,400 tonnes) and Korrigan-class (in Ireland), are diesel-electric fleet submarines designed in the British Empire in the late 1970s to supplement the Royal Navy's nuclear submarine force. Six Upholder-class submarines also serve in the Irish Navy.

Specifications

• Type: AIP equipped Diesel Electric Submarine
• Service Period: 1989-Present
• Characteristics
  • Length: 255.5 feet (76.88 meters)
  • Beam: 24 feet (7.32 meters)
  • Draught: 25 feet (7.62 meters
  • Displacement: 2,400 tons
• Crew: 54 (7 officers and 48 crew)
• Endurance: 56 days
• Power: 8.035 MW
• Propulsion: 2 x Paxman Valenta 1600 RPA SZ diesels, 1 x GEC electric motor, Ballard Canada hydrogen fuel cells
• Range: 10,250 nautical miles (18,983 kilometers)
• Speed: Surface: 12 knots (22.23 km/hr); Submerged: 25 knots (46.3 km/hr)
• Sensor Suite:
  • Type 2040 active/passive bow ASDIC
  • Type 2041 micropuffs ASIDC
  • Type 2007 flank ASDIC
  • Type 2046/CANTASS MOD towed array ASDIC
  • Type 2019 active intercept ASDIC
  • Thales Librascope SFCS Mk 1 Mod C fire control system
  • Kelvin Hughes Type 1007 RDF

Armament: 6 x 21" torpedo tubes (fires Tigerfish Mod 2 or Spearfish torpedoes, as well as submarine-launched Sea Eagle missiles and naval mines)

Unit Run

Royal Navy

• HMS Upholder (S41)
• HMS Unseen (S42)
• HMS Ursula (S43)
• HMS Unicorn (S44)
• HMS Ulysses (S45)
• HMS Ultimatum (S46)
• HMS Unbroken (S47)
• HMS Uproar (S48)
• HMS Umbra (S49)
• HMS Undaunted (S50)
• HMS Urgent (S51)
• HMS Upstart (S52)
• HMS Urania (S53)
• HMS Undine (S54)
• HMS Ursa (S55)
• HMS Uther (S56)

Irish Navy

• LÉ Korrigan (S01)
• LÉ Bodach (S02)
• LÉ Dullahan (S03)
• LÉ Kelpie (S04)
• LÉ Selkie (S05)
• LÉ Failinis (S06)