HMS Trenchant S-91

Type:
Submarine

Class:

Builder:
Vickers Shipbuilding & Engineering Ltd.
Barrow-in-Furness, England
Hull Number:

S-91

Ordered:
March 22, 1983
Launched:
November 3, 1986
Keel Laid:
October 28, 1985
Commissioned:
January 14, 1989
Fate:
Active in commission as of 2007.
Homeport: Devonport Naval Base, Plymouth, England


Dimensions, machinery and performance

Length:
280' 1"
Engines:
2 GEC-Alsthom geared steam turbines powered by
1 Rolls Royce PWR1 nuclear reactor
Beam:
32' 1"
Motors:
2 Paxman diesel
1 emergency back up diesel
Draft:
31' 2"
Shafts:
1 (Pumpjet propulsor)
Pressure Hull
Horsepower
Length:
N/A
Engines:
15,000 (11.2 MW)
Diameter:
N/A
Motors:
2,800 (2.1 MW)
4,000 (back up)
Displacement
Speed
Surfaced:
4,740 std.
Surfaced:
20 knots
Submerged:
5,208 std.
Submerged:
32 knots
Diving Depth:
984'+ (tested to 1,935')
Endurance:
85 days
Crew:
130


Armament As Built
Number Carried
Type
Arrangement

Maximum Range / Warhead

5
21" (533mm)
Torpedo tubes

Bow
(a)
Tigerfish Mk 24 torpedo
23,000 yards @ 35 knots (13 miles)
30,000 yards @ 24 knots (17 miles)
750 lb. Torpex warhead

Tomahawk SLCM
BGM-109 missiles
1,000 NM @ 550 mph
1,000 LB warhead

UGM-84A Harpoon missiles
195 miles @ 536 mph
487 lb. warhead
Armament notes:
No vertical tubes all weapons are launched from the bow tubes.
Up to 25 weapons (torpedoes or missiles) can be carried. Normal arrangement is
4 missiles and 21 torpedoes.

(a) Carried the Spearfish torpedo from the mid 1990's.

Notes:
Christened by Lady Hunt.


Builder's Data
Page published Mar. 25, 2007