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Saturday, February 02, 2008

A 1914 versioni of my British light cruiser

This type wants greater size, but for 1914, all I was willing to do was to go up to 475ft and raise the speed to 28 knots. The second gun aft is in the superfiring position. The armament is still just 7-6in guns and 4-21in TT. The belt is 3in and the deck is 2in. They have decent range with a maximum range of 5500nm at 16 knots. This is the Springsharp report:
GB/CL/1914, Great Britain Light Cruiser laid down 1914 (Engine 1918)

Displacement:
 5,290 t light; 5,483 t standard; 6,223 t normal; 6,815 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
 (480.00 ft / 475.00 ft) x 47.00 ft x (18.00 / 19.34 ft)
 (146.30 m / 144.78 m) x 14.33 m  x (5.49 / 5.89 m)

Armament:
      7 - 6.00" / 152 mm 45.0 cal guns - 108.92lbs / 49.41kg shells, 150 per gun
   Quick firing guns in deck and hoist mounts, 1914 Model
   3 x Single mounts on centreline ends, evenly spread
  1 raised mount aft - superfiring
   4 x Single mounts on sides, forward deck aft
      Weight of broadside 762 lbs / 346 kg
      4 - 21.0" / 533 mm, 20.00 ft / 6.10 m torpedoes - 1.279 t each, 5.116 t total
 In 2 sets of deck mounted side rotating tubes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 3.00" / 76 mm 410.00 ft / 124.97 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 3.00" / 76 mm 300.00 ft / 91.44 m 8.00 ft / 2.44 m
   Main Belt covers 133 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  0.70" / 18 mm 410.00 ft / 124.97 m 17.00 ft / 5.18 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 3.00" / 76 mm  4.00" / 102 mm

   - Protected deck - single deck: 2.00" / 51 mm For and Aft decks
 Forecastle: 2.00" / 51 mm  Quarter deck: 2.00" / 51 mm

   - Conning towers: Forward 4.00" / 102 mm,  Aft 0.00" / 0 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 2 shafts, 40,863 shp / 30,484 Kw = 28.00 kts
 Range 5,500nm at 16.00 kts
 Bunker at max displacement = 1,331 tons

Complement:
 349 - 455

Cost:
 £0.590 million / $2.360 million

Distribution of weights at normal displacement:
 Armament: 208 tons, 3.3 %
    - Guns: 202 tons, 3.3 %
    - Torpedoes: 5 tons, 0.1 %
 Armour: 1,645 tons, 26.4 %
    - Belts: 684 tons, 11.0 %
    - Torpedo bulkhead: 181 tons, 2.9 %
    - Armament: 174 tons, 2.8 %
    - Armour Deck: 577 tons, 9.3 %
    - Conning Tower: 29 tons, 0.5 %
 Machinery: 1,474 tons, 23.7 %
 Hull, fittings & equipment: 1,964 tons, 31.6 %
 Fuel, ammunition & stores: 933 tons, 15.0 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   8,018 lbs / 3,637 Kg = 74.2 x 6.0 " / 152 mm shells or 1.5 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 2.0 ft / 0.6 m
 Roll period: 13.9 seconds
 Steadiness - As gun platform (Average = 50 %): 60 %
   - Recoil effect (Restricted arc if above 1.00): 0.41
 Seaboat quality  (Average = 1.00): 1.20

Hull form characteristics:
 Hull has rise forward of midbreak,
   a ram bow and a cruiser stern
 Block coefficient (normal/deep): 0.542 / 0.552
 Length to Beam Ratio: 10.11 : 1
 'Natural speed' for length: 21.79 kts
 Power going to wave formation at top speed: 56 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 9.00 degrees
 Stern overhang: -3.00 ft / -0.91 m
 Freeboard (% = length of deck as a percentage of waterline length):
    Fore end,  Aft end
    - Forecastle: 20.00 %,  23.00 ft / 7.01 m,  22.00 ft / 6.71 m
    - Forward deck: 17.00 %,  22.00 ft / 6.71 m,  22.00 ft / 6.71 m
    - Aft deck: 48.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Quarter deck: 15.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
    - Average freeboard:  17.04 ft / 5.19 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 153.5 %
  - Above water (accommodation/working, high = better): 132.6 %
 Waterplane Area: 15,464 Square feet or 1,437 Square metres
 Displacement factor (Displacement / loading): 118 %
 Structure weight / hull surface area: 78 lbs/sq ft or 381 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.47
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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