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FIGHTING SHIPS OF THE WORLD
UNITED KINGDOM
TORPEDO SHIPS
"O" and "P" destroyers (ORIBI) (16, 1941 - 1942)


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Obdurate 1946

Ships


Name No Yard No Builder Laid down Launched Comp Fate Modification
Offa G29, 1948- D129?   Fairfield, Govan 7/1940 11/3/1941 9/1941 to Pakistan 11/1949 (طارق ) "O" group (destroyers)
Onslaught (ex-Pathfinder) G04,1948- D04?   Fairfield, Govan 1/1941 9/10/1941 6/1942 to Pakistan 3/1951 (طغرل ) "O" group (destroyers)
Onslow (ex-Pakenham) G17, 1948- D117?   John Brown, Clydebank 7/1940 31/3/1941 10/1941 to Pakistan 11/1949 (تپپو سلطان ) "O" group (destroyers)
Oribi (ex-Observer) G66   Fairfield, Govan 1/1940 14/1/1941 7/1941 to Turkey 1/1946 (Gayret) "O" group (destroyers)
Obdurate G39, 1948- D139   Denny, Dumbarton 4/1940 19/2/1942 9/1942 BU 11/1964 "O" group (minelayers)
Obedient G48, 1948- D248   Denny, Dumbarton 5/1940 30/4/1942 10/1942 BU 10/1962 "O" group (minelayers)
Opportune G80, 1948- D180   Thornycroft, Woolston 3/1940 21/1/1942 8/1942 BU 11/1955 "O" group (minelayers)
Orwell G98, 1948- D98   Thornycroft, Woolston 5/1940 2/4/1942 10/1942 BU 6/1965 "O" group (minelayers)
Pakenham (ex-Onslow) G06   Hawthorn Leslie, Hebburn 2/1940 28/1/1941 2/1942 sunk 16/4/1943 "P" group
Paladin G69, 1948- D169   John Brown, Clydebank 7/1940 11/6/1941 12/1941 BU 10/1962 "P" group
Panther G41   Fairfield, Govan 7/1940 28/5/1941 12/1941 sunk 9/10/1943 "P" group
Partridge G30   Fairfield, Govan 6/1940 5/8/1941 2/1942 sunk 18/12/1942 "P" group
Pathfinder (ex-Onslaught) G10   Hawthorn Leslie, Hebburn 3/1940 10/4/1941 4/1942 CTL 11/2/1945 "P" group
Penn G77, 1948- D177?   Vickers-Armstrong, Tyne 12/1939 12/2/1941 2/1942 BU 10/1950 "P" group
Petard (ex-Persistent) G56, 1948- D126   Vickers-Armstrong, Tyne 12/1939 27/3/1941 6/1942 BU 6/1967 "P" group
Porcupine G93   Vickers-Armstrong, Tyne 12/1939 10/6/1941 8/1942 CTL 9/12/1942 "P" group


Technical data


Max speed, kts, kn

37

Displacement standard, t

1540 - 1550

1793

Displacement full, t

2220 - 2270 (later 2365 - 2430)

2593

Length, m

100.2 pp 105.2 oa

103.5 pp 109.2 oa

Breadth, m

10.7

10.9

Draught, m

4.11 (later 4,24 - 4,32) deep load

4.90 deep load

No of shafts

2

2

Machinery

2 sets Parsons geared steam turbines, 2 Admiralty 3-drum boilers

2 sets Parsons geared steam turbines, 2 Admiralty 3-drum boilers

Power, h. p.

40000

40000

Max speed, kts ---

36.75

Fuel, t

oil 472

Endurance, nm(kts)

3850(20)

1700 (20)

Armament

Obdurate, Obedient, Opportune, Orwell: 4 x 1 - 102/45 QF Mk V, 1 x 4 - 40/39 2pdr QF Mk VIII, 4 x 1 - 20/70 Oerlikon Mk II/IV, 2 x 4 - 533 TT, 2 DCT, 2 DCR (30 DC), 60 mines

Offa, Onslaught, Onslow, Oribi: 4 x 1 - 120/45 QF Mk IX, 1 x 1 - 102/45 QF Mk V, 1 x 4 - 40/39 2pdr QF Mk VIII, 4 x 1 - 20/70 Oerlikon Mk II/IV, 1 x 4 - 533 TT, 2 DCT, 2 DCR (30 DC)

"P" class: 5 x 1 - 102/45 QF Mk V, 1 x 4 - 40/39 2pdr QF Mk VIII, 4 x 1 - 20/70 Oerlikon Mk II/IV, 1 x 4 - 533 TT, 4 DCT, 2 DCR (70 DC)

F26: 1 x 2 - 102/45 Mk 19, 1 x 2 - 40/60 Mk 5, 3 x 1 - 40/60 Mk 9, 1 x 4 - 533 TT, 2 x 3 - 305 Squid Mk 3 ASWRL

F98, 169: 1 x 2 - 102/45 Mk 19, 1 x 2 - 40/60 Mk 5, 3 x 1 - 40/60 Mk 9, 1 x 4 - 533 TT, 2 x 3 - 305 Squid Mk 3 ASWRL, up to 60 mines

Electronic equipment

presumably: type 285, type 286P radars, type 144 sonar

some presumably: type 271, type 285, type 286P radars, type 144 sonar

type 293Q, type 974 radars, type 146B, type 170, type 174P sonars, UA-3 ECM suite
Complement

176 - 212

170 - 180



Standard scale images


<i>Onslow</i> 1942
Onslow 1942
<i>Pakenham</i> 1943
Pakenham 1943
<i>Obedient</i> 1942
Obedient 1942
<i>Onslow</i> 1942
Onslow 1942


Graphics


<i>Obdurate</i> 1946
Obdurate 1946


Ship project history


The first representatives so-called "Intermediate destroyers" which concept has developed by Admiralty in 1938. They should hold intermediate position between large fleet destroyers (since "Tribal" class) and fast escorts of "Hunt" class. At the expense of some simplification of a construction and armament their building was supposed to be conducted quickly enough (in comparison with large destroyers), that would allow to change outdated "V" and "Modified W" classes destroyers in the shortest terms. As starting point for designing "J" class destroyer has been chosen, hull and machinery which borrowed practically without changes (have only slightly moderated dimensions). It was originally planed to use both single and twin 120mm mounts but at a phase of a basic design the latter had refused. In an ultimate kind "intermediate" destroyer at displacement 1500t had armament consisted of four single 120mm mounts, multi-barrelled pompom, two quadruple 12.7mm MGs and two quadruple TT, i.e. she differed from "Н" class by only pompom and larger DC stowage (up to 30).

The order for building of 8 ships of "O" class has been given out in day of the entering of UK to war 3/9/1939, within "Emergency war program" (therefore the ships of this type called as "1st emergency flotilla"), the order for precisely same 8 ships ("Р" class or "2nd emergency flotilla") has followed exactly a month later.

War experience has raised the question about strengthening of AA armament, and in the summer of 1940 in the specification one of TTs has changed by 102mm AA gun. In the end of a year an idea appeared to rearm the ships by twin 102mm mounts but since the latter did not suffice, the choice has fallen on all same single 102mm mounts, and in February, 1941 the decision followed to rearm 8 ships (6 of "Р" class and 2 of "O" class, for uniformity last two have interchanged their names on beginning from "P" from 120mm to 102mm AA guns (four on standard places and one more instead of one TT). Moderated loads with new guns allowed to strengthen anti-submarine armament.

In March, 1941 it has been decided to arrange 4 ships of "O" class as minelayers. As well as in a case with "Р" class, their artillery had been changed from 120mm to 102mm, but their number have shrunk to 4, second TT returned on its place, and rails for 60 mines were mounted on stern deck aft from second funnel. Removing of one of 102mm gun and one TT for loads reduction was provided if maximal mine stowage was carried.

Modernizations


1943, all: - 2 x 1 - 20/70; + 2 x 2 - 20/70 Oerlikon Mk II/IV

1943 - 1944, "O" class: + 2 DCT (60 DC totally)

1943 - 1944, mostly: - type 286P radar; + type 290 radar

1944 - 1945, mostly: - type 286P or type 290 radar; + type 291 radar

1944 - 1945, some: + type 272 radar

1943 - 1944, Offa, Onslaught, Onslow, Paladin, Pathfinder, Penn, Petard: - 1 x 1 - 102/45; + 1 x 4 - 533 TT

late 1944, Petard: - 4 x 1 - 102/45; + 2 x 2 - 102/45 QF Mk XVI, 2 x 1 - 20/70 Oerlikon Mk II/IV

1/1946, Offa, Onslaught, Onslow: 4 x 1 - 120/45 CP Mk XVIII, 1 x 4 - 40/39 Mk VII, 2 x 2 - 20/70 Mk V, 2 x 1 - 20/70 Mk III, 2 x 4 - 533 TT, 4 DCT, 2 DCR (60), type 271 (may be), type 272 (may be), type 285, type 291 radars, type 144 sonar

1/1946, Oribi: 4 x 1 - 120/45 CP Mk XVIII, 1 x 1 - 102/45 HA Mk III, 1 x 4 - 40/39 Mk VII, 2 x 2 - 20/70 Mk V, 2 x 1 - 20/70 Mk III, 1 x 4 - 533 TT, 4 DCT, 2 DCR (60), type 271 (may be), type 272 (may be), type 285, type 291 radars, type 144 sonar

1/1946, Obdurate, Obedient, Opportune, Orwell: 4 x 1 - 102/45 HA Mk III, 1 x 4 - 40/39 Mk VII, 2 x 2 - 20/70 Mk V, 2 x 1 - 20/70 Mk III, 2 x 4 - 533 TT, 4 DCT, 2 DCR (60), 60 mines, type 271 (may be), type 272 (may be), type 285, type 291 radars, type 144 sonar

1/1946, Paladin, Penn: 4 x 1 - 102/45 HA Mk III, 1 x 4 - 40/39 Mk VII, 2 x 2 - 20/70 Mk V, 2 x 1 - 20/70 Mk III, 2 x 4 - 533 TT, 4 DCT, 2 DCR (70), type 271 (may be), type 272 (may be), type 285, type 291 radars, type 144 sonar

1/1946, Petard: 2 x 2 - 102/45 Mk XIX, 1 x 4 - 40/39 Mk VII, 2 x 2 - 20/70 Mk V, 4 x 1 - 20/70 Mk III, 2 x 4 - 533 TT, 4 DCT, 2 DCR (70), type 271 (may be), type 272 (may be), type 285, type 291 radars, type 144 sonar

1952 - 1956, Orwell, Paladin, Petard were converted to type 16 frigates with data as follows: