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Saturday, May 28, 2005

Another run at the GB/BB/1914 battleship design

My friend Cliff's concept for a 1914 battleship looked like a WWII-style ship. The design is flush-decked with a tower mast. The speed was 25 knots with 9-18in/45 and 20-5in/50 QF guns. I kept the same dimensions, except the displacement must be greater by a large increment. The dimensions are 800ft x 120ft x 31ft. The armor basis is 18in with a modified "all-or-nothing" scheme. The upper belt is thin, regrettably. That is partly mitigated by the thick deck (7in). This is the SpringSharp report. A great difference is that the guns are specified correctly. This is the corresponding photo:

This is the SpringSharp report:
GB/BB/1914, Great Britain  Battleship laid down 1914 (Engine 1921)

Displacement:
 51,522 t light; 53,984 t standard; 56,799 t normal; 59,051 t full load

Dimensions: Length overall / water x beam x draught
 801.08 ft / 800.00 ft x 120.00 ft x 31.00 ft (normal load)
 244.17 m / 243.84 m x 36.58 m  x 9.45 m

Armament:
      9 - 18.00" / 457 mm guns (3x3 guns), 3,150.00lbs / 1,428.82kg shells, 1914 Model
   Breech loading guns in turrets (on barbettes)
   on centreline ends, majority forward, 1 raised mount - superfiring
      20 - 5.00" / 127 mm guns (10x2 guns), 62.50lbs / 28.35kg shells, 1914 Model
   Quick firing guns in deck mounts with hoists
   on side, all amidships, 4 raised mounts - superfiring
 Weight of broadside 29,600 lbs / 13,426 kg
 Shells per gun, main battery: 80

Armour:
   - Belts:  Width (max) Length (avg)  Height (avg)
 Main: 18.0" / 457 mm 525.00 ft / 160.02 m 8.00 ft / 2.44 m
 Ends: Unarmoured
 Upper: 8.00" / 203 mm 525.00 ft / 160.02 m 8.00 ft / 2.44 m
   Main Belt covers 101 % of normal length

   - Torpedo Bulkhead:
  3.00" / 76 mm 525.00 ft / 160.02 m 28.00 ft / 8.53 m

   - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
 Main: 18.0" / 457 mm 7.00" / 178 mm  15.0" / 381 mm
 2nd: 2.00" / 51 mm       -         -

   - Armour deck: 7.00" / 178 mm, Conning tower: 12.00" / 305 mm

Machinery:
 Oil fired boilers, steam turbines, 
 Geared drive, 4 shafts, 95,043 shp / 70,902 Kw = 25.00 kts
 Range 6,500nm at 15.00 kts
 Bunker at max displacement = 5,067 tons

Complement:
 1,839 - 2,391

Cost:
 £6.552 million / $26.210 million

Distribution of weights at normal displacement:
 Armament: 3,437 tons, 6.1 %
 Armour: 21,011 tons, 37.0 %
    - Belts: 4,754 tons, 8.4 %
    - Torpedo bulkhead: 1,632 tons, 2.9 %
    - Armament: 4,562 tons, 8.0 %
    - Armour Deck: 9,681 tons, 17.0 %
    - Conning Tower: 382 tons, 0.7 %
 Machinery: 3,273 tons, 5.8 %
 Hull, fittings & equipment: 23,801 tons, 41.9 %
 Fuel, ammunition & stores: 5,277 tons, 9.3 %
 Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping ability:
 Survivability (Non-critical penetrating hits needed to sink ship):
   92,857 lbs / 42,119 Kg = 31.8 x 18.0 " / 457 mm shells or 15.9 torpedoes
 Stability (Unstable if below 1.00): 1.13
 Metacentric height 8.2 ft / 2.5 m
 Roll period: 17.6 seconds
 Steadiness - As gun platform (Average = 50 %): 77 %
   - Recoil effect (Restricted arc if above 1.00): 0.87
 Seaboat quality  (Average = 1.00): 1.54

Hull form characteristics:
 Hull has a flush deck
 Block coefficient: 0.668
 Length to Beam Ratio: 6.67 : 1
 'Natural speed' for length: 28.28 kts
 Power going to wave formation at top speed: 45 %
 Trim (Max stability = 0, Max steadiness = 100): 50
 Bow angle (Positive = bow angles forward): 2.00 degrees
 Stern overhang: 0.00 ft / 0.00 m
 Freeboard (% = measuring location as a percentage of overall length):
    - Stem:  31.00 ft / 9.45 m
    - Forecastle (20 %): 26.00 ft / 7.92 m
    - Mid (50 %):  26.00 ft / 7.92 m
    - Quarterdeck (15 %): 26.00 ft / 7.92 m
    - Stern:  26.00 ft / 7.92 m
    - Average freeboard: 26.40 ft / 8.05 m
 Ship tends to be wet forward

Ship space, strength and comments:
 Space - Hull below water (magazines/engines, low = better): 77.0 %
  - Above water (accommodation/working, high = better): 201.3 %
 Waterplane Area: 74,760 Square feet or 6,945 Square metres
 Displacement factor (Displacement / loading): 103 %
 Structure weight / hull surface area: 239 lbs/sq ft or 1,166 Kg/sq metre
 Hull strength (Relative):
  - Cross-sectional: 0.96
  - Longitudinal: 1.45
  - Overall: 1.00
 Hull space for machinery, storage, compartmentation is excellent
 Room for accommodation and workspaces is excellent
 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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