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The River-class is a class of offshore patrol vessels built primarily for the British Empire's Royal Navy. A total of nine were built: Eight for the Royal Navy replacing the seven ships of the Island-class and the two Castle-class patrol vessels. While a fifth modified River-class (HTMS Krabi) was built for the Royal Thai Navy. A further four ships were built for the Puerto Rican Navy as well.

In the Royal Navy, the River-class are primarily used with the Fishery Protection Squadron and EEZ patrol.

The ships are significantly larger than the Island-class vessels and have a large open deck aft allowing them to be fitted with equipment for a specific role, which can include fire-fighting, disaster relief and anti-pollution work. For this purpose, a 28 ton capacity crane is fitted. In addition, the deck is strong enough for the transport of various tracked and wheeled light vehicles, or an LCVP.


Batch I[]

To be continued later on...

Batch II[]

  • Type: Offshore Patrol Vessel
  • Service Period: 2003-Present
  • Characteristics:
    • Length: 296.92 feet (90.5 meters)
    • Beam: 44.62 feet (13.6 meters)
    • Draught: 12.47 feet (3.8 meters)
    • Displacement: 1,700 tons (Standard); 2,000 tons (Full Load)
  • Crew: 36
  • Endurance: 35 days
  • Propulsion: 2 x Ruston 12RK 270 diesel engines, 280 kW bow thruster, 185 kw stern thruster
  • Range: 5,500 nautical miles (10,186 kilometers)
  • Speed: 24 knots (44.45 km/h)
  • Sensor Suite:
    • SCANTER 4103 Air/Surface Search RDF
    • Sharp Eye Navigation RDF
  • Armament:
    • 1 x DSM30M 30mm cannon
    • 2 x Mk.44 miniguns
    • 6 x Diemaco 14.5mm machine guns
  • Aircraft Carried: 1 x Agusta-Westland Merlin helicopter
  • Aviation Facilities: Helicopter Deck
  • Boats Carried: 2 x RHIBs

Unit Run[]

Royal Navy[]

Batch I[]

  • HMS Tyne (P284)
  • HMS Severn (P285)
  • HMS Mersey (P286)
  • HMS Clyde (P287)
  • HMS Derwent (P292)
  • HMS Calder (P293)
  • HMS Truro (P294)
  • HMS Ashburne (P295)

Batch II[]

  • HMS Forth (P296) - under construction
  • HMS Medway (P297) - under construction
  • HMS Trent (P298) - under construction

Puerto Rican Navy[]

  • PRS Lightning (P-21)
  • PRS Thunder (P-22)
  • PRS Hurricane (P-23)
  • PRS Tornado (P-24)

Royal Thai Navy[]

  • HTMS Krabi (551)
  • HTMS Trang (552)

See Also[]