Porpoise

Type	SS
Country	UK
Displacement (t)	2,450
Length (m)	88.0
Beam (m)	8.1
Draft (m)	5.5
Height (m)	8.1
Max speed submerged (kn)	17.0
Max speed surfaced (kn)	12.0
Max safe depth (m)	122
Endurance (days)	50
Propeller	2 propellers
Diesel-electric	Yes
Titanium hull	No
Class year	1956

Sensors

Sonar (2)

Name	Type	Platform	Passive range (km)	Active range (km)
Type 186	Hull	sub	1.3	—
Type 187	Hull	sub	1.3	1.7

Launchers (3)

Name

Tubes

Fire control

Max launch depth (m)

533mm Torpedo Tube (forward)

FCS

100

1962 - 1971: 14 x Mk 20 S , 14 x Mk 8
1972 - 1979: 14 x Mk 23 Grog , 14 x Mk 8
1980 - 1984: 14 x Mk 24 Mod 1 , 14 x Mk 8
1985 - present: 14 x Mk 24 Mod 2 , 14 x Mk 8

533mm Torpedo Tube (aft)

FCS

100

1962 - present: 2 x Mk 20 S

Signal Ejector

—

305

Individual hulls (8)

Name

Short name

Country

Start date

End date

Remark

S01 Porpoise

HMS Porpoise

1958-04-17 (Commissioned)

1982-01-01 (Decommissioned)

S02 Rorqual

HMS Rorqual

1958-10-24 (Commissioned)

1977-05-05 (Decommissioned)

S03 Narwhal

HMS Narwhal

1959-05-04 (Commissioned)

1977-02-10 (Decommissioned)

S04 Grampus

HMS Grampus

1958-12-19 (Commissioned)

1980-01-01 (Training ship, sunk in 1980)

Royal Navy: 1958-12-19 – 1976-01-01
Royal Navy: 1976-01-01 – 1980-01-01 (Training ship, sunk in 1980)

S05 Finwhale

HMS Finwhale

1960-08-19 (Commissioned)

1988-01-01 (Training ship, scrapped in 1988)

Royal Navy: 1960-08-19 – 1979-01-01
Royal Navy: 1979-01-01 – 1988-01-01 (Training ship, scrapped in 1988)

S06 Cachalot

HMS Cachalot

1959-09-01 (Commissioned)

1979-11-12 (Decommissioned)

S07 Sealion

HMS Sealion

1961-07-25 (Commissioned)

1987-01-01 (Decommissioned)

S08 Walrus

HMS Walrus

1961-02-10 (Commissioned)

1987-01-01 (Decommissioned)