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Monday, September 06, 2004

My concept of a good German light cruiser for 1914

My Ger/CL/1914 design seems to have been inspired by the British Arethusa class, but has a very German "look". I believe that the original concept was to have 7-5in QF guns, but that I apparently decided that it needed more guns, so I added a 5in gun on either side of the bridge. Speed continued to be important to me, so I specified 32 knots. The specs are:
  • legend displacement: 3,500 tons
  • armament: 9-5in QF, 4-21in TT, 40 mines
  • dimensions: 430ft x 40ft x 15.9ft
  • speed: 32 nots
  • power: 60,000 SHP
  • machinery weight basis: 45 SHP/ton of machinery
  • Cp: 0.56
  • Cm: 0.80
  • hull weight basis (c): 0.30 (x 10^-4)

I had to rediscover my notation, as I did not remember how my "c" factor was scaled. The way this is used is:

hull weight in tons = length in feet x beam in feet x hull depth in feet x c x 10^-4

  • protection: 1in deck, amidships
  • oil fuel: 700 tons
  • feed water: 100 tons
  • machinery weight: 1,335 tons
  • hull weight: 1,500 tons
  • armament: 103.5 tons + 6 tons of mines
  • full load displacement: 4,305 tons

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