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Friday, January 05, 2007

A change of pace: the Black Prince (GB/CA/1884)

Some work that I had done a long time ago surfaced in the last few days. One of the designs is a ship named Black Prince, which I am calling the GB/CA/1884. This ship has 4-8in and 10-6in guns, all breachloaders. The armour basis is 4.5in. The maximum speed is 16.5 knots. The range is 6,500nm at 12 knots. This is the Springsharp report:
Black Prince, Great Britain Armoured Cruiser laid down 1884

Displacement:
 7,627 t light; 7,927 t standard; 9,800 t normal; 11,299 t full load

Dimensions: Length overall / water x beam x draught
 400.00 ft / 400.00 ft x 58.00 ft x 27.00 ft (normal load)
 121.92 m / 121.92 m x 17.68 m  x 8.23 m

Armament:
      4 - 8.00" / 203 mm guns in single mounts, 232.96lbs / 105.67kg shells, 1884 Model
   Breech loading guns in turrets (on barbettes)
   on centreline, all forward
      10 - 6.00" / 152 mm guns in single mounts, 98.28lbs / 44.58kg shells, 1884 Model
   Breech loading guns in casemate mounts 
   on side, all aft
 Weight of broadside 1,915 lbs / 868 kg
 Shells per gun, main battery: 90
 6 - 17.7" / 450 mm above water torpedoes

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 4.50" / 114 mm 250.00 ft / 76.20 m 16.00 ft / 4.88 m
 Ends: Unarmoured
   Main Belt covers 96 % of normal length
   Main belt does not fully cover magazines and engineering spaces

   - Torpedo Bulkhead:
  1.00" / 25 mm 250.00 ft / 76.20 m 27.00 ft / 8.23 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 4.50" / 114 mm 4.00" / 102 mm  4.50" / 114 mm
 2nd: 4.00" / 102 mm 4.00" / 102 mm  4.00" / 102 mm

   - Armour deck: 4.00" / 102 mm, Conning tower: 4.50" / 114 mm

Machinery:
 Coal fired boilers, simple reciprocating steam engines, 
 Direct drive, 2 shafts, 8,145 ihp / 6,076 Kw = 16.50 kts
 Range 6,500nm at 12.00 kts
 Bunker at max displacement = 3,372 tons (100% coal)

Complement:
 492 - 640

Cost:
 £0.692 million / $2.768 million

Distribution of weights at normal displacement:
 Armament: 239 tons, 2.4 %
 Armour: 2,686 tons, 27.4 %
    - Belts: 785 tons, 8.0 %
    - Torpedo bulkhead: 250 tons, 2.5 %
    - Armament: 411 tons, 4.2 %
    - Armour Deck: 1,195 tons, 12.2 %
    - Conning Tower: 44 tons, 0.5 %
 Machinery: 1,601 tons, 16.3 %
 Hull, fittings & equipment: 3,101 tons, 31.6 %
 Fuel, ammunition & stores: 2,173 tons, 22.2 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   12,583 lbs / 5,708 Kg = 54.0 x 8.0 " / 203 mm shells or 2.2 torpedoes
 Stability (Unstable if below 1.00): 1.15
 Metacentric height 2.9 ft / 0.9 m
 Roll period: 14.4 seconds
 Steadiness - As gun platform (Average = 50 %): 100 %
   - Recoil effect (Restricted arc if above 1.00): 0.57
 Seaboat quality  (Average = 1.00): 2.00

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.548
 Length to Beam Ratio: 6.90 : 1
 'Natural speed' for length: 20.00 kts
 Power going to wave formation at top speed: 39 %
 Trim (Max stability = 0, Max steadiness = 100): 59
 Bow angle (Positive = bow angles forward): 0.00 degrees
 Stern overhang: -2.00 ft / -0.61 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  22.00 ft / 6.71 m
    - Forecastle (20 %): 19.00 ft / 5.79 m
    - Mid (50 %):  19.00 ft / 5.79 m
    - Quarterdeck (15 %): 19.00 ft / 5.79 m
    - Stern:  19.00 ft / 5.79 m
    - Average freeboard: 19.24 ft / 5.86 m

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 109.9 %
  - Above water (accommodation/working, high = better): 103.8 %
 Waterplane Area: 16,154 Square feet or 1,501 Square metres
 Displacement factor (Displacement / loading): 126 %
 Structure weight / hull surface area: 111 lbs/sq ft or 542 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.90
  - Longitudinal: 2.76
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is adequate
 Room for accommodation and workspaces is adequate
 Ship has slow, easy roll, a good, steady gun platform
 Excellent seaboat, comfortable, can fire her guns in the heaviest weather

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