Attempt at an early battleship

Started by Darman, June 02, 2011, 08:26:42 PM

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Darman

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NENS Alexandria, Republic of New England Central-battery Ironclad laid down 1877
Armoured Frigate (Broadside ironclad)

Displacement:
   8,518 t light; 9,183 t standard; 9,644 t normal; 10,013 t full load

Dimensions: Length overall / water x beam x draught
   325.00 ft / 325.00 ft x 64.00 ft x 26.00 ft (normal load)
   99.06 m / 99.06 m x 19.51 m  x 7.92 m

Armament:
      2 - 11.00" / 279 mm guns in single mounts, 535.73lbs / 243.00kg shells, 1877 Model
     Muzzle loading guns in broadside mounts
     on side, all amidships
      10 - 10.00" / 254 mm guns in single mounts, 402.50lbs / 182.57kg shells, 1877 Model
     Muzzle loading guns in broadside mounts
     on side, evenly spread
     8 guns on gundeck (upper belt level) - Limited use in heavy seas
      6 - 3.75" / 95.3 mm guns in single mounts, 21.23lbs / 9.63kg shells, 1877 Model
     Breech loading guns in deck mounts
     on side, evenly spread
   Weight of broadside 5,224 lbs / 2,369 kg
   Shells per gun, main battery: 150
   4 - 14.0" / 355.6 mm above water torpedoes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   12.0" / 305 mm   200.29 ft / 61.05 m   9.60 ft / 2.93 m
   Ends:   6.00" / 152 mm   113.73 ft / 34.66 m   9.60 ft / 2.93 m
     10.98 ft / 3.35 m Unarmoured ends
   Upper:   8.00" / 203 mm   211.25 ft / 64.39 m   8.00 ft / 2.44 m
     Main Belt covers 95 % of normal length
     Main belt does not fully cover magazines and engineering spaces

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   12.0" / 305 mm         -               -
   2nd:   8.00" / 203 mm         -               -

   - Armour deck: 1.00" / 25 mm

Machinery:
   Coal fired boilers, simple reciprocating steam engines,
   Direct drive, 2 shafts, 5,071 ihp / 3,783 Kw = 14.00 kts
   Range 3,000nm at 8.00 kts
   Bunker at max displacement = 830 tons (100% coal)

Complement:
   486 - 632

Cost:
   £1.000 million / $4.000 million

Distribution of weights at normal displacement:
   Armament: 653 tons, 6.8 %
   Armour: 2,887 tons, 29.9 %
      - Belts: 1,907 tons, 19.8 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 692 tons, 7.2 %
      - Armour Deck: 288 tons, 3.0 %
      - Conning Tower: 0 tons, 0.0 %
   Machinery: 1,095 tons, 11.3 %
   Hull, fittings & equipment: 2,914 tons, 30.2 %
   Fuel, ammunition & stores: 1,126 tons, 11.7 %
   Miscellaneous weights: 970 tons, 10.1 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     6,323 lbs / 2,868 Kg = 11.8 x 11.0 " / 279 mm shells or 1.1 torpedoes
   Stability (Unstable if below 1.00): 1.20
   Metacentric height 3.6 ft / 1.1 m
   Roll period: 14.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 80 %
         - Recoil effect (Restricted arc if above 1.00): 0.42
   Seaboat quality  (Average = 1.00): 1.42

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.624
   Length to Beam Ratio: 5.08 : 1
   'Natural speed' for length: 18.03 kts
   Power going to wave formation at top speed: 42 %
   Trim (Max stability = 0, Max steadiness = 100): 56
   Bow angle (Positive = bow angles forward): 0.00 degrees
   Stern overhang: 0.00 ft / 0.00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18.00 ft / 5.49 m
      - Forecastle (20 %):   17.00 ft / 5.18 m
      - Mid (50 %):      17.00 ft / 5.18 m
      - Quarterdeck (15 %):   17.00 ft / 5.18 m
      - Stern:      12.62 ft / 3.85 m
      - Average freeboard:   16.75 ft / 5.11 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 100.4 %
      - Above water (accommodation/working, high = better): 97.6 %
   Waterplane Area: 15,559 Square feet or 1,445 Square metres
   Displacement factor (Displacement / loading): 86 %
   Structure weight / hull surface area: 131 lbs/sq ft or 639 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.92
      - Longitudinal: 2.17
      - 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
   Good seaboat, rides out heavy weather easily

4t=4 14in torpedoes

With 10% of normal displacement for rigging/spars/sails/etc.  Should give me virtually unlimited range though.  Barring starvation and dehydration.