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Friday, January 13, 2006

The US/CL/1923 design

The US/CL/1923 design is able to make 36 knots and has a 4in armour basis. The armament remains the same as the 1921 version. The draft is too deep at 23ft. The length and beam are also greater at 595ft (WL) x 58ft x 23ft. The normal displacement is 11,600 tons. This is the Springsharp report:
US/CL/1923, United States Light Cruiser laid down 1923 (Engine 1947)

Displacement:
 10,434 t light; 10,797 t standard; 11,600 t normal; 12,242 t full load

Dimensions: Length overall / water x beam x draught
 599.54 ft / 595.00 ft x 58.00 ft x 23.00 ft (normal load)
 182.74 m / 181.36 m x 17.68 m  x 7.01 m

Armament:
      9 - 6.00" / 152 mm guns (3x3 guns), 108.00lbs / 48.99kg shells, 1923 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      8 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1923 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships
      36 - 0.50" / 12.7 mm guns in single mounts, 0.06lbs / 0.03kg shells, 1923 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 24 raised mounts
 Weight of broadside 1,474 lbs / 669 kg
 Shells per gun, main battery: 150
 12 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.00" / 102 mm 460.00 ft / 140.21 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 119 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.00" / 102 mm 2.00" / 51 mm  4.00" / 102 mm

   - Armour deck: 2.00" / 51 mm, Conning tower: 4.00" / 102 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 150,180 shp / 112,034 Kw = 36.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 1,445 tons

Complement:
 558 - 726

Cost:
 £3.024 million / $12.095 million

Distribution of weights at normal displacement:
 Armament: 184 tons, 1.6 %
 Armour: 2,080 tons, 17.9 %
    - Belts: 895 tons, 7.7 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 281 tons, 2.4 %
    - Armour Deck: 860 tons, 7.4 %
    - Conning Tower: 44 tons, 0.4 %
 Machinery: 3,710 tons, 32.0 %
 Hull, fittings & equipment: 4,460 tons, 38.4 %
 Fuel, ammunition & stores: 1,166 tons, 10.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   10,683 lbs / 4,846 Kg = 98.9 x 6.0 " / 152 mm shells or 1.3 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 2.9 ft / 0.9 m
 Roll period: 14.2 seconds
 Steadiness - As gun platform (Average = 50 %): 53 %
   - Recoil effect (Restricted arc if above 1.00): 0.45
 Seaboat quality  (Average = 1.00): 1.05

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.512
 Length to Beam Ratio: 10.26 : 1
 'Natural speed' for length: 24.39 kts
 Power going to wave formation at top speed: 62 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 2.00 ft / 0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  29.00 ft / 8.84 m
    - Forecastle (20 %): 25.00 ft / 7.62 m
    - Mid (67 %):  25.00 ft / 7.62 m (17.00 ft / 5.18 m aft of break)
    - Quarterdeck (15 %): 17.00 ft / 5.18 m
    - Stern:  17.00 ft / 5.18 m
    - Average freeboard: 22.68 ft / 6.91 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 116.2 %
  - Above water (accommodation/working, high = better): 137.4 %
 Waterplane Area: 23,237 Square feet or 2,159 Square metres
 Displacement factor (Displacement / loading): 106 %
 Structure weight / hull surface area: 104 lbs/sq ft or 509 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.05
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

1 comment:

Spindrift said...

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Regards,

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