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Friday, November 18, 2005

A better protected GB/CL/1927

I failed at achieving 36.5 knots, but I was able to add more protection, partly by reducing some, so that I could have a 1in belt that covers a good bit of side. The range is less, but this seemed to be an improvement. Adding the belt improved seakeeping! This is the Springsharp report:
GB/CL/1925, Great Britain Light Cruiser laid down 1927 (Engine 1950)

Displacement:
 6,102 t light; 6,318 t standard; 6,720 t normal; 7,042 t full load

Dimensions: Length overall / water x beam x draught
 555.36 ft / 550.00 ft x 52.00 ft x 21.00 ft (normal load)
 169.27 m / 167.64 m x 15.85 m  x 6.40 m

Armament:
      8 - 6.00" / 152 mm guns (4x2 guns), 108.00lbs / 48.99kg shells, 1927 Model
   Dual purpose guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      8 - 2.24" / 57.0 mm guns (4x2 guns), 5.65lbs / 2.56kg shells, 1927 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      16 - 1.57" / 40.0 mm guns (8x2 guns), 1.95lbs / 0.89kg shells, 1927 Model
   Anti-aircraft guns in deck mounts 
   on side, evenly spread, 6 raised mounts
 Weight of broadside 940 lbs / 427 kg
 Shells per gun, main battery: 150
 4 - 21.0" / 533.4 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 1.00" / 25 mm 530.00 ft / 161.54 m 10.00 ft / 3.05 m
 Ends: Unarmoured
   Main Belt covers 148 % of normal length

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 1.00" / 25 mm 0.75" / 19 mm  0.75" / 19 mm

   - Armour deck: 0.75" / 19 mm, Conning tower: 1.00" / 25 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 103,563 shp / 77,258 Kw = 36.00 kts
 Range 4,500nm at 15.00 kts
 Bunker at max displacement = 724 tons

Complement:
 370 - 482

Cost:
 £2.397 million / $9.588 million

Distribution of weights at normal displacement:
 Armament: 118 tons, 1.7 %
 Armour: 521 tons, 7.8 %
    - Belts: 205 tons, 3.0 %
    - Torpedo bulkhead: 0 tons, 0.0 %
    - Armament: 65 tons, 1.0 %
    - Armour Deck: 243 tons, 3.6 %
    - Conning Tower: 8 tons, 0.1 %
 Machinery: 2,478 tons, 36.9 %
 Hull, fittings & equipment: 2,986 tons, 44.4 %
 Fuel, ammunition & stores: 618 tons, 9.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   4,931 lbs / 2,237 Kg = 45.7 x 6.0 " / 152 mm shells or 0.9 torpedoes
 Stability (Unstable if below 1.00): 1.23
 Metacentric height 2.7 ft / 0.8 m
 Roll period: 13.2 seconds
 Steadiness - As gun platform (Average = 50 %): 55 %
   - Recoil effect (Restricted arc if above 1.00): 0.39
 Seaboat quality  (Average = 1.00): 1.10

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.392
 Length to Beam Ratio: 10.58 : 1
 'Natural speed' for length: 23.45 kts
 Power going to wave formation at top speed: 59 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 5.00 degrees
 Stern overhang: 3.00 ft / 0.91 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  27.00 ft / 8.23 m
    - Forecastle (20 %): 24.00 ft / 7.32 m
    - Mid (37 %):  24.00 ft / 7.32 m (16.00 ft / 4.88 m aft of break)
    - Quarterdeck (15 %): 16.00 ft / 4.88 m
    - Stern:  16.00 ft / 4.88 m
    - Average freeboard: 19.20 ft / 5.85 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 133.0 %
  - Above water (accommodation/working, high = better): 147.5 %
 Waterplane Area: 17,527 Square feet or 1,628 Square metres
 Displacement factor (Displacement / loading): 105 %
 Structure weight / hull surface area: 93 lbs/sq ft or 455 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.92
  - Longitudinal: 2.04
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is cramped
 Room for accommodation and workspaces is excellent

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