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Tuesday, January 23, 2007

The Springsharp report for a British "13 Class" ship

I did as I said and tried a British "13 Class" ship in Springsharp. Except for being much heavier than the Japanese design, the ship works quite well, especially considering the relatively narrow beam for 18in guns. This is the Springsharp report:
GB/BB/1921 "13", Great Britain Battlecruiser laid down 1923

Displacement:
 51,067 t light; 53,474 t standard; 56,200 t normal; 58,381 t full load

Dimensions: Length overall / water x beam x draught
 900.00 ft / 900.00 ft x 108.00 ft x 32.00 ft (normal load)
 274.32 m / 274.32 m x 32.92 m  x 9.75 m

Armament:
      8 - 18.00" / 457 mm guns (4x2 guns), 2,916.00lbs / 1,322.68kg shells, 1923 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, evenly spread, 2 raised mounts - superfiring
      14 - 6.00" / 152 mm guns in single mounts, 108.00lbs / 48.99kg shells, 1923 Model
   Quick firing guns in casemate mounts 
   on side, all amidships
   14 guns in hull casemates - Limited use in heavy seas
      8 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1923 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      16 - 1.57" / 40.0 mm guns (4x4 guns), 2.00lbs / 0.91kg shells, 1923 Model
   Breech loading guns in deck mounts 
   on side, all amidships, all raised mounts - superfiring
 Weight of broadside 25,287 lbs / 11,470 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 13.0" / 330 mm 600.00 ft / 182.88 m 8.00 ft / 2.44 m
 Ends: 5.00" / 127 mm 220.00 ft / 67.06 m 12.00 ft / 3.66 m
   80.00 ft / 24.38 m Unarmoured ends
 Upper: 10.0" / 254 mm 600.00 ft / 182.88 m 8.00 ft / 2.44 m
   Main Belt covers 103 % of normal length

   - Torpedo Bulkhead:
  4.00" / 102 mm 600.00 ft / 182.88 m 32.00 ft / 9.75 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 13.0" / 330 mm 9.00" / 229 mm  13.0" / 330 mm
 2nd: 6.00" / 152 mm 4.00" / 102 mm  6.00" / 152 mm

   - Armour deck: 5.00" / 127 mm, Conning tower: 13.00" / 330 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 175,851 shp / 131,185 Kw = 30.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 4,907 tons

Complement:
 1,824 - 2,372

Cost:
 £15.317 million / $61.269 million

Distribution of weights at normal displacement:
 Armament: 3,161 tons, 5.6 %
 Armour: 19,699 tons, 35.1 %
    - Belts: 5,170 tons, 9.2 %
    - Torpedo bulkhead: 2,842 tons, 5.1 %
    - Armament: 4,499 tons, 8.0 %
    - Armour Deck: 6,777 tons, 12.1 %
    - Conning Tower: 411 tons, 0.7 %
 Machinery: 5,877 tons, 10.5 %
 Hull, fittings & equipment: 22,331 tons, 39.7 %
 Fuel, ammunition & stores: 5,133 tons, 9.1 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   72,606 lbs / 32,933 Kg = 24.9 x 18.0 " / 457 mm shells or 11.4 torpedoes
 Stability (Unstable if below 1.00): 1.10
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 17.4 seconds
 Steadiness - As gun platform (Average = 50 %): 58 %
   - Recoil effect (Restricted arc if above 1.00): 0.82
 Seaboat quality  (Average = 1.00): 1.16

Hull form characteristics:
 Hull has rise forward of midbreak
 Block coefficient: 0.632
 Length to Beam Ratio: 8.33 : 1
 'Natural speed' for length: 30.00 kts
 Power going to wave formation at top speed: 48 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): -2.00 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 %): 28.00 ft / 8.53 m
    - Mid (50 %):  28.00 ft / 8.53 m (20.00 ft / 6.10 m aft of break)
    - Quarterdeck (15 %): 20.00 ft / 6.10 m
    - Stern:  20.00 ft / 6.10 m
    - Average freeboard: 24.24 ft / 7.39 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 93.5 %
  - Above water (accommodation/working, high = better): 181.3 %
 Waterplane Area: 73,264 Square feet or 6,806 Square metres
 Displacement factor (Displacement / loading): 99 %
 Structure weight / hull surface area: 220 lbs/sq ft or 1,074 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 1.01
  - Longitudinal: 0.99
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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