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J Class, British Destroyers


Photograph of Javelin-class destroyer

Imperial War Museum. Via Wikipedia Commons


Specifications:


Tonnage 1690 tons standard displacement
2330 tons fully loaded
Dimensions 348' by 35' by 9'
108.6m by 10.8m by 2.7m
Maximum speed       36 knots
Complement 220
Armament 3x2 4.7"/45 guns (250 rounds per gun)
1 4"/45 DP gun
1x5 21" torpedo tubes
4x1 40mm/40 AA guns
4x1 20mm Oerlikon AA guns
1 depth charge track (20 depth charges)
2 depth charge throwers
Machinery
2-shaft Parsons geared turbine (40,000 shp)
2 Admiralty 3-drum boilers
Bunkerage 484 tons fuel oil
Sensors
Type 285 radar
Type 286P radar
Range 5500 nautical miles (10,200km) at 15 knots
Modifications
1942: Type 291 radar

Numerous and variable modifications as the war progressed, including restoring a second bank that had been removed in 1941 and adding a few more 20mm guns, updated radars, and HF/DF.


The "J" class or Javelins were completed in 1939-1941. The design was developed partially in response to criticisms of the previous "Tribal" class, which was thought to be too large and too gun-oriented. The new design was smaller and more balanced, though the desire to use a dual-purpose main armament was thwarted by the lack of a really suitable weapon. The ships were somewhat wet but otherwise had good seakeeping. Machinery dispersal was somewhat inadequate, due to the decision to go to two boilers with a single funnel, but the use of longitudinal framing imparted great hull strength.

Their balanced design ended further discussion of constructing separate classes of attackers (emphasizing torpedoes) and counter-attackers (emphasizing gunnery), and their basic hull form would be adopted for the mass production destroyers of the war years.

Units in the Pacific:

Jupiter     
Changi      Mined 1942-2-28 off Java


References

Friedman (2006)

Gogin (2010; accessed 2012-12-25)

Whitley (1988)

Worth (2001)



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