HMS Derwent of the River class


The River class, later designated as E class, marked the beginning of a new time. They were the first true ocean-going torpedo boat destroyers with a raised forecastle for increase seaworthiness and a balanced armament with artillery and torpedoes. Despite their top speed of only 25 knots, they were able to keep up that speed on the high seas, which their predecessors had not been able to manage. Most of them still feature a triple-expansion engine, but a few were already fitted with Parsons turbines. A major weakness, however, is their very short range.

Ship data

Relative combat value: 123

Basic damage control capacity: 123%


Displacement: 550 tons

Length: 67 m

Width: 7 m

Draught: 2 m

Standard crew: 70


Maximum speed (undamaged): 25 knots

Endurance: 1297 km

Coal capacity: 50 tons

Armour protection

Conning tower armour: 0

Hull armour: 0

Main belt armour: 0

Deck armour: 0

Best armour type: None


1 x 12-pdr 12cwt QF Mk II, centrally controlled. Ammo: 100 rounds

5 x 6-pdr 8cwt QF Mk Is, locally controlled. Ammo: 300 rounds

2 x 18in Mk VII Torpedoes, centrally controlled. Ammo: 2 torpedoes

Ships in class

  • Derwent
  • Stour
  • Test
  • Ettrick
  • Exe
  • Cherwell
  • Dee
  • Ure
  • Wear
  • Swale
  • Rother
  • Teviot
  • Garry
  • Eden
  • Boyne
  • Doon
  • Kale
  • Foyle
  • Liffey
  • Itchen
  • Moy
  • Arun
  • Ouse

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