NAVYPEDIA

Ships

Name	No	Yard No	Builder	Laid down	Launched	Comp	Fate
Upholder	S40		VSEL, Barrow	11/1983	2.12.1986	9.6.1990	to Canada 7.1998 (Chicoutimi)
Unseen	S41		Cammell Laird, Birkenhead	12.8.1987	14.11.1989	20.7.1991	to Canada 7.1998 (Victoria)
Ursula	S42		Cammell Laird, Birkenhead	28.8.1987	22.2.1991	8.5.1992	to Canada 7.1998 (Corner Brook)
Unicorn	S43		Cammell Laird, Birkenhead	13.3.1989	16.4.1992	25.6.1993	to Canada 7.1998 (Windsor)

Technical data

Displacement standard, t	1870
Displacement normal, t	2185 / 2400
Length, m	70.3
Breadth, m	7.60
Draught, m	5.50
No of shafts	1
Machinery	2 Paxman Valenta 16RPA 200SZ diesel-generators, 1 electric motor
Power, h. p.	5400
Max speed, kts	12 / 20
Fuel, t	diesel oil 200
Endurance, nm(kts)	8000(8) / 270(3)
Armament	6 - 533 TT (bow, 18, inc 4 Sub-Harpoon SSM (UGM-84B2), mines)
Electronic equipment	S40: type 1007 radar, type 2040, type 2041 MicroPUFFS, type 2026 towed array, type 2019 PARIS sonars, UAC ECM suite, 2x SSE Mk 8 decoy launchers, DCC CCS S41-43: type 1007 radar, type 2040, type 2041 MicroPUFFS, type 2046 towed array, type 2019 PARIS sonars, UAC ECM suite, 2x SSE Mk 8 decoy launchers, DCC CCS
Complement	44
Diving depth operational, m	260

Standard scale images

Project history

A new type of 'conventional' submarine was announced in September 1979, to replace the Oberons and to make up numbers for training. Although at one time twelve boats were planned this dropped to ten and then nine, but under the 1990-91 defence cuts the class was stopped at four units.

The first four were fitted with Type 2040 sonar, derived from the French Eledone and Netherlands Octopus, but plans to replace this with Type 2075 were dropped in 1991. This class was declared surplus to requirements in 1994.

Modernizations

late 1990s, all: - UAC ECM suite; + UAP(2) ECM suite

Naval service

No significant events.