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Steam gun boat information


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Class overview
NameSteam gun boat (SGB)
OperatorsRN
Built1940-1942
In serviceNov 1941- post-war
Planned52
Completed7
Cancelled2
Lost1
General characteristics
Displacement175 tons (standard), 255 tons (deep load)
Length44.3 m (145 ft 8 in) overall
Beam7.1 m (20 ft)
Draught1.68 m (5 ft 6 in)
Installed power8,000 shp (5,965 kW)
Propulsion
  • 1 × LaMont boiler
  • 2 × Metropolitan-Vickers geared Steam turbines
  • 2 × shafts
Speed35 kn (65 km/h) maximum
Range
  • 200 NM (370 km) at full speed
  • 900 NM (1,700 km) at 12 knots
Complement27 initially (3 officers and 24 men), later rising to 34 as a result of changes in armament
Armament
  • Final arrangement:
  • 1 × 3-in (76.2 mm) gun
  • 2 × single 6-pdr guns
  • 2 × twin 20-mm Oerlikon cannon
  • 2 × 21-inch torpedo tubes

Steam gun boats (SGBs) were small Royal Navy vessels built from 1940 to 1942 for Coastal Forces during the Second World War. The class consisted of nine steam-powered torpedo boats.

They were developed in parallel with the 35-metre long Fairmile D motor torpedo boats ("dog boats"), specifically due to the need to hunt down German E-boats at a time of scarcity of suitable diesel engines. While sixty were planned, only an initial batch of nine were ordered on 8 November 1940, of which seven were completed.

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