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Trafalgar class submarine
United Kingdom
Builders:	Vickers Shipbuilding and Engineering Ltd
Operators:	Royal Navy
Preceding class:	Swiftsure-class
Following class:	Astute-class
In service:	1984
Ships in Class
Ships in class:	7
Ships in active service:	Trafalgar Turbulent Tireless Torbay Trenchant Talent Triumph
General Characteristics
Class type:	Fleet submarine (S)
Displacement:	5200 tons
Length:	279ft
Beam:	33ft
Draught:	31ft
Propulsion and power:	Nuclear reactor powering steam turbines
Speed:	30 knots
Range:	Unlimited, except by food supplies
Complement:	130
Armament:	Tomahawk land-attack cruise missiles. Spearfish wire-guided heavyweight torpedoes

The Trafalgar class submarines are, until the introduction of the Astute class, the Royal Navy's most advanced nuclear attack submarines (SSNs).

Essentially a refinement of the Swiftsure class and designed six years later than its predecessor, the first Trafalgar class submarine was ordered on April 7, 1977 and completed in 1983. Turbulent was ordered on July 28, 1978; Tireless on July 5, 1979; Torbay on June 26, 1981; Trenchant on March 22, 1983; Talent on September 10, 1984; and finally Triumph on July 3, 1986.

The major improvements include a new reactor core and the Type 2020 sonar. Internal layout is almost identical to the Swiftsure, and it is only 2.5 metres longer.

Rather than the seven/nine-bladed propeller used by the Swiftsures, Trafalgar class submarines use pump-jet propulsion - a high-pitch, low-revolution propeller which is much quieter but much heavier than conventional propeller designs. Development of this system was not complete in time for installation in the class's name-ship vessel, HMS Trafalgar, and so the pump-jet was first used in the second in the class, HMS Turbulent. The hull is also covered in anechoic tiles which are designed to absorb sound rather than reflect it, making the boats more difficult to detect with active sonar.

The Trafalgar class have strengthened fins and retractable hydroplanes, allowing them to surface through thick ice.

In 1993 Triumph sailed to Australia, covering a distance of 41,000 miles whilst submerged and without any forward support. This marked the longest solo deployment by any nuclear submarine.

The Trafalgar class was to be replaced by the Future Attack Submarine (FASM), however this project was effectively cancelled in 2001 and replaced by the Maritime Underwater Future Capability. It seems likely that the Astute class will replace the Trafalgar class as well as the Swiftsure class.

Contents 1 Service Problems 2 General characteristics 3 Units 4 External links

Despite being regarded as sophisticated designs, the Trafalgar class have suffered from a number of technical difficulties. In 1998 Trenchant experienced a steam leak, forcing the crew to shut down the nuclear reactor. In 2000 cracks were discovered in the reactor cooling pipes of Tireless, forcing her to proceed to Gibraltar on diesel power. In August 2000 it was revealed that with Tireless still at Gibraltar, Torbay, Turbulent, Trenchant and Talent were at Devonport for refit or repair and with Trafalgar undergoing sea trials, only one boat - Triumph - was fully operational. By 2005 refits had reportedly corrected these problems.

In 2007, a small explosion aboard HMS Tireless resulted in the death of two sailors and injury of another. The accident took place while the submarine was submerged under the Arctic icecap during a joint British-American exercise. An Oxygen Candle in the forward section of the submarine was thought to be responsible for the accident [1].

• Builder: Vickers Shipbuilding and Engineering Ltd
• Displacement: 4,750 tons surfaced, 5,208 tons submerged
• Length: 85.4 meters
• Beam: 9.8 meters
• Draught: 9.5 meters
• Complement: 18 officers, 112 ratings
• Propulsion: 1 x Rolls-Royce PWR1 pressurized water cooled nuclear reactor delivering 15,000 shp for 30 kt max
• Armament: five tubes capable of firing:
  • Spearfish torpedoes
  • Tomahawk missiles

Tigerfish and Harpoons are no longer used by any submarine class within the Royal Navy.

• Sensors:
  • sonar (bow, flank, active intercept, and towed arrays)
  • periscopes (attack and search)
  • collision avoidance radar
• Command System:
  • SMCS
  • SMCS-NG (based on Microsoft Windows) from 2004 onwards

The Trafalgar class includes seven boats:

• Trafalgar (S107)
• Turbulent (S87)
• Tireless (S88)
• Torbay (S90)
• Trenchant (S91)
• Talent (S92)
• Triumph (S93)

• Royal Navy official site
• Report on 2003 upgrade of Torbay
• Abridged history of each boat
• MaritimeQuest Trafalgar Class Overview

Trafalgar-class submarine

Trafalgar | Turbulent | Tireless | Torbay | Trenchant | Talent | Triumph

List of submarines of the Royal Navy List of submarine classes of the Royal Navy