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Saturday, January 14, 2006

The US/CL/1927 design

The new features in the US/CL/1927 design are a flush deck, a 16-ft high 4in belt, 12-6in QF guns, a range of 10,000nm at 15 knots, so that the design is well-suited for Pacific warfare, and finally, a 1in torpedo bulkhead. Previous designs in this series had too low a range and lacked an armoured torpedo bulkhead. This design is more survivable than its predecessors in the series. This is the Springsharp report:]
US/CL/1927, United States Light Cruiser laid down 1927 (Engine 1950)

Displacement:
 12,700 t light; 13,149 t standard; 14,500 t normal; 15,581 t full load

Dimensions: Length overall / water x beam x draught
 619.71 ft / 615.00 ft x 59.00 ft x 23.00 ft (normal load)
 188.89 m / 187.45 m x 17.98 m  x 7.01 m

Armament:
      12 - 6.00" / 152 mm guns (4x3 guns), 108.00lbs / 48.99kg shells, 1927 Model
   Quick firing guns in turrets (on barbettes)
   on centreline ends, evenly spread, 1 raised mount - superfiring
      8 - 5.00" / 127 mm guns in single mounts, 62.50lbs / 28.35kg shells, 1927 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, 1927 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 24 raised mounts
 Weight of broadside 1,798 lbs / 816 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 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 115 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 460.00 ft / 140.21 m 22.00 ft / 6.71 m

   - 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, 177,749 shp / 132,601 Kw = 36.00 kts
 Range 10,000nm at 15.00 kts
 Bunker at max displacement = 2,432 tons

Complement:
 659 - 858

Cost:
 £4.468 million / $17.871 million

Distribution of weights at normal displacement:
 Armament: 225 tons, 1.6 %
 Armour: 3,005 tons, 20.7 %
    - Belts: 1,202 tons, 8.3 %
    - Torpedo bulkhead: 374 tons, 2.6 %
    - Armament: 389 tons, 2.7 %
    - Armour Deck: 989 tons, 6.8 %
    - Conning Tower: 51 tons, 0.4 %
 Machinery: 4,252 tons, 29.3 %
 Hull, fittings & equipment: 5,218 tons, 36.0 %
 Fuel, ammunition & stores: 1,800 tons, 12.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   15,384 lbs / 6,978 Kg = 142.4 x 6.0 " / 152 mm shells or 1.9 torpedoes
 Stability (Unstable if below 1.00): 1.17
 Metacentric height 3.0 ft / 0.9 m
 Roll period: 14.2 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.50
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.608
 Length to Beam Ratio: 10.42 : 1
 'Natural speed' for length: 24.80 kts
 Power going to wave formation at top speed: 64 %
 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:  31.00 ft / 9.45 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (67 %):  24.00 ft / 7.32 m
    - Quarterdeck (15 %): 24.00 ft / 7.32 m
    - Stern:  24.00 ft / 7.32 m
    - Average freeboard: 24.56 ft / 7.49 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 162.5 %
  - Above water (accommodation/working, high = better): 143.2 %
 Waterplane Area: 26,740 Square feet or 2,484 Square metres
 Displacement factor (Displacement / loading): 109 %
 Structure weight / hull surface area: 106 lbs/sq ft or 516 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.93
  - Longitudinal: 2.02
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

1 comment:

Eddie said...

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