Royal Navy Type 12 ASW Frigates

Whitby and Rothesay Class

This class was the first of a long line of Royal Navy post-war frigates (apart from the destroyer conversions types 15 and 16)
and can be considered as the best anti-submarine warfare escorts of their era. The 6 "Whitbys" were in effect the prototypes
of every Royal Navy anti-submarine warfare frigate up until the Type 21 and Type 22 two decades later.  The "Rothesays"
originally differed only in internal layout but were later refitted to Leander Class frigate standard.

Propulsion
Steam Turbine 30,000 shp
2 Shafts
Speed 29 knots maximum

Displacement
2,800tons Standard

Dimensions
370^ft Length
41^ft Beam
17^ft Draught


Radar
Type 275 Mk6M GFCS tracker  
(Type 903 MRS3 GFCS in modernized Rothesays)

Type 262 MRS 1 GFCS tracker   (STAAG FC)

Type 974/978 navigation radar  
(type 1006 navigation radar in modernised Rothesays)

Type 293 low angle air/sea search  
(Type 994 surface/air search set in modernised Rothesays)

Type 277 Height finding radar  
(deleted in modernised Rothesays)

Sonar
Type 174/177 Search sonar
Type 170 Attack sonar
Type 162 bottom profiling sonar

Pre-Conversion
1 Mk6 twin 4.5"/45 DP gun

1 Mk2 STAAG twin 40mm/60 AA
(later replaced by 1 Mk9 40mm/6O AA)

2 Mk10 limbo ASW mortars

14 21" ASW TT
(on some Whitbys removed after only a short time)

Post-Conversion
1 Mk6 twin 4.5"/45 DP gun
1 Mk10 limbo ASW mortar
2 20mm/83 AA
1 GWS 22 quad Seacat system
1 Wasp helicopter