NAVYPEDIA

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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 [Tariq])	"O" group (destroyers)
Onslaught (ex-Pathfinder)	G04,1948- D04?		Fairfield, Govan	1.1941	9.10.1941	6.1942	to Pakistan 3.1951 (طغرل [Tughril])	"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 [Tippu Sultan])	"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, 1952- F98		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, 1956- F169		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, 1956- F26		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
Data variant	as completed	Type 16
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

Graphics

Project history

The first representatives of 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 replace 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 planned 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, under "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 was replaced 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 the 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 complete 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, Orwell; 1956, Paladin, Petard were converted to type 16 frigates with data as given in the table.

Naval service

Porcupine 9.12.1942 was badly damaged by torpedo from German submarine U602, never repaired, hull was cut on two parts in a point of torpedo hit and till the end of war served as two hulks "Pork" and "Pine". Partridge 18.12.1942 was sunk by a torpedo from German submarine U565 at Oran. Panther 9.10.1943 was sunk by German Ju 87 bomber in East Mediterranean. Pakenham 16.4.1943 in Central Mediterranean was damaged by gunfire of Italian torpedo boats Cigno and Cassiopea and scuttled by own crew. Pathfinder was badly damaged 11.2.1945 by Japanese aircraft and after temporary repair was laid up into reserve. Obdurate was badly damaged in early 1944 by an acoustic torpedo and repaired more than year.