Prestonian-class frigate

Class overview
Operators	Royal Canadian Navy / Canadian Forces; Royal Norwegian Navy;
Preceded by	River class
Succeeded by	General Purpose Frigate (planned); Halifax class (actual);
In commission	28 August 1953 – 15 September 1967
Planned	21
Completed	21
Retired	21
General characteristics
Type	Frigate
Displacement	2,360 t (2,360.0 t) (full load)
Length	301.25 ft (91.82 m)o/a
Beam	36.5 ft (11.13 m)
Draught	12 ft (3.66 m)
Propulsion	2 x Admiralty 3-drum boilers, 2 shafts, reciprocating vertical triple expansion, 5,500 ihp (4,100 kW)
Speed	19 knots (35.2 km/h)
Complement	140
Sensors and ; processing systems	1 × USN SU Type radar (4-inch gunnery spotting); 1 × Sperry Mk.2 navigation radar; 1 × Type 147 target depth finding sonar; 1 × Type 164B search sonar; 1 × SQS 501 (Type 162) bottom profiler sonar; 1 × Optical fire control director for twin 40mm;
Electronic warfare ; & decoys	1 × DAU hf/df; 1 × AN/UPD 501 d/f;
Armament	1 × twin QF 4 in (102 mm)/45 QF Mk.16 guns; 1 × twin 40 mm/56 Mk.5 guns; 2–4 x 40 mm/56 Boffin guns; 2 × Squid Mk.4 ASW 3-barrelled mortars;
Aviation facilities	HMCS Buckingham fitted with flight deck for helicopter tests.

The Prestonian-class ocean anti-submarine escort frigate was a class of 21 frigates that served with the Royal Canadian Navy from 1953–1967 and with the Royal Norwegian Navy from 1956–1977.

They were converted from mothballed River-class frigates of British design that had been placed in reserve following the end of the Second World War. The first vessel to be reactivated and undergo refit was Prestonian which was recommissioned on 28 August 1953. The class did not use sequential pennant numbers.

Class overview

Operators	Royal Canadian Navy / Canadian Forces Royal Norwegian Navy
Preceded by	River class
Succeeded by	General Purpose Frigate (planned) Halifax class (actual)
In commission	28 August 1953 – 15 September 1967
Planned	21
Completed	21
Retired	21
General characteristics
Type	Frigate
Displacement	2,360 t (2,360.0 t) (full load)
Length	301.25 ft (91.82 m)o/a
Beam	36.5 ft (11.13 m)
Draught	12 ft (3.66 m)
Propulsion	2 x Admiralty 3-drum boilers, 2 shafts, reciprocating vertical triple expansion, 5,500 ihp (4,100 kW)
Speed	19 knots (35.2 km/h)
Complement	140
Sensors and processing systems	1 × USN SU Type radar (4-inch gunnery spotting) 1 × Sperry Mk.2 navigation radar 1 × Type 147 target depth finding sonar 1 × Type 164B search sonar 1 × SQS 501 (Type 162) bottom profiler sonar 1 × Optical fire control director for twin 40mm
Electronic warfare & decoys	1 × DAU hf/df 1 × AN/UPD 501 d/f
Armament	1 × twin QF 4 in (102 mm)/45 QF Mk.16 guns 1 × twin 40 mm/56 Mk.5 guns 2–4 x 40 mm/56 Boffin guns 2 × Squid Mk.4 ASW 3-barrelled mortars
Aviation facilities	HMCS Buckingham fitted with flight deck for helicopter tests.