O and P-class destroyer

	HMS Oribi in 1946
Class overview
Name	O and P class
Operators	Royal Navy; Pakistan Navy; Turkish Navy;
Preceded by	L and M class
Succeeded by	Q and R class
Subclasses	4 inch O, 4.7 inch O, P
Completed	16
Lost	4
Retired	12
General characteristics P class
Type	Destroyer
Displacement	1,690 tons (1,717 tonnes) standard; 1,640 tons (1,666 tonnes); 2,250 tons (2,286 tonnes) full load;
Length	345 ft (105 m) o/a
Beam	35 ft (10.7 m)
Draught	9 ft (2.7 m)
Propulsion	2 x Admiralty 3-drum water-tube boilers, Parsons geared steam turbines, 40,000 shp on 2 shafts
Speed	36.75 kt
Range	3,850 nmi at 20 kt
Armament	5 × QF 4 in Mk.V (102 mm L/45), single mounts HA Mk.III; 4 × QF 2 pdr Mk.VIII (40 mm L/39), quad mount Mk.VII; Up to 6 x QF 20 mm Oerlikon, single mount P Mk.III; 4 (1x4) tubes for 21 inch torpedoes Mk.IX; 4 × throwers and 2 x racks for 70 depth charges;
General characteristics (4.7 inch O class)
Displacement	1,610 tons (1,636 tonnes); 2,270 tons (2,306 tonnes) full load;
Complement	176 (217 in leader)
Armament	4 × QF 4.7-inch (120-mm) Mk IX guns, single mounts CP Mk.XVIII; 1 × QF 4 in Mk.V (102 mm L/45), mount HA Mk.III; 4 × QF 2 pdr Mk.VIII (40 mm L/39), quad mount Mk.VII; Up to 6 x QF 20 mm Oerlikon, single mount P Mk.III; 4 (1x4) tubes for 21 in torpedoes Mk.IX;
Notes	Other characteristics as per P class
General characteristics (4 inch O class)
Displacement	1,540 tons (1,564 tonnes); 2,220 tons (2,255 tonnes) full load;
Armament	4 × QF 4 in Mk.V (102 mm L/45), single mount HA Mk.III; 4 × QF 2 pdr Mk.VIII (40 mm L/39), quad mount Mk.VII; Up to 6 x QF 20 mm Oerlikon, single mount P Mk.III; 8 (2x4) tubes for 21 in torpedoes Mk.IX; Up to 60 mines (where fitted-for);
Notes	Other characteristics as per P class

The O and P class was a class of destroyers of the British Royal Navy. Ordered in 1939, they were the first ships in the War Emergency Programme, also known as the 1st and 2nd Emergency Flotilla, respectively. They served as convoy escorts in World War II, and some were subsequently converted to fast second-rate anti-submarine frigates in the 1950s.

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