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Tuesday, November 28, 2006

The very fast, Renown-Repulse type ship

This design has very little in common with the Renown and Repulse, except that this ship also has a main armament of 6-15in guns. Otherwise, this is a further expansion of the 12in-gunned, 35 knot design. This is the Springsharp report:
GB/CB/1921 15in guns 35 knots, Great Britain Battlecruiser laid down 1921 (Engine 1937)

Displacement:
 32,345 t light; 33,654 t standard; 36,500 t normal; 38,777 t full load

Dimensions: Length overall / water x beam x draught
 816.31 ft / 814.00 ft x 102.00 ft x 29.00 ft (normal load)
 248.81 m / 248.11 m x 31.09 m  x 8.84 m

Armament:
      6 - 15.00" / 381 mm guns (3x2 guns), 1,687.50lbs / 765.44kg shells, 1921 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      16 - 4.70" / 119 mm guns (6 mounts), 51.91lbs / 23.55kg shells, 1921 Model
   Quick firing guns in turrets (on barbettes)
   on side, all amidships, 4 raised mounts - superfiring
      6 - 4.70" / 119 mm guns in single mounts, 51.91lbs / 23.55kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, all amidships, all raised mounts - superfiring
      24 - 1.57" / 40.0 mm guns (6x4 guns), 1.95lbs / 0.89kg shells, 1921 Model
   Anti-aircraft guns in deck mounts with hoists
   on side, evenly spread, all raised mounts
 Weight of broadside 11,314 lbs / 5,132 kg
 Shells per gun, main battery: 90

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 7.00" / 178 mm 530.00 ft / 161.54 m 12.00 ft / 3.66 m
 Ends: Unarmoured
   Main Belt covers 100 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 530.00 ft / 161.54 m 29.00 ft / 8.84 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 9.00" / 229 mm 6.00" / 152 mm  9.00" / 229 mm
 2nd: 3.00" / 76 mm 3.00" / 76 mm  3.00" / 76 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 9.00" / 229 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 212,697 shp / 158,672 Kw = 35.00 kts
 Range 7,500nm at 18.00 kts
 Bunker at max displacement = 5,123 tons

Complement:
 1,319 - 1,716

Cost:
 £8.006 million / $32.025 million

Distribution of weights at normal displacement:
 Armament: 1,414 tons, 3.9 %
 Armour: 9,336 tons, 25.6 %
    - Belts: 1,894 tons, 5.2 %
    - Torpedo bulkhead: 569 tons, 1.6 %
    - Armament: 2,278 tons, 6.2 %
    - Armour Deck: 4,382 tons, 12.0 %
    - Conning Tower: 213 tons, 0.6 %
 Machinery: 5,895 tons, 16.2 %
 Hull, fittings & equipment: 15,699 tons, 43.0 %
 Fuel, ammunition & stores: 4,155 tons, 11.4 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   53,960 lbs / 24,476 Kg = 32.0 x 15.0 " / 381 mm shells or 6.6 torpedoes
 Stability (Unstable if below 1.00): 1.16
 Metacentric height 6.8 ft / 2.1 m
 Roll period: 16.4 seconds
 Steadiness - As gun platform (Average = 50 %): 52 %
   - Recoil effect (Restricted arc if above 1.00): 0.53
 Seaboat quality  (Average = 1.00): 1.04

Hull form characteristics:
 Hull has a flush deck
   and transom stern
 Block coefficient: 0.531
 Length to Beam Ratio: 7.98 : 1
 'Natural speed' for length: 33.04 kts
 Power going to wave formation at top speed: 57 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 4.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  33.00 ft / 10.06 m
    - Forecastle (20 %): 27.00 ft / 8.23 m
    - Mid (35 %):  27.00 ft / 8.23 m
    - Quarterdeck (15 %): 27.00 ft / 8.23 m
    - Stern:  27.00 ft / 8.23 m
    - Average freeboard: 27.48 ft / 8.38 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 101.7 %
  - Above water (accommodation/working, high = better): 230.9 %
 Waterplane Area: 59,214 Square feet or 5,501 Square metres
 Displacement factor (Displacement / loading): 113 %
 Structure weight / hull surface area: 187 lbs/sq ft or 913 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.41
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is excellent

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