Persian BB for 1917

[ledeper]

Persia, Persia BB laid down 1917 (Engine 1906)

Displacement:
   9.908 t light; 10.528 t standard; 11.320 t normal; 11.953 t full load

Dimensions: Length overall / water x beam x draught
   423,13 ft / 419,95 ft x 65,62 ft x 22,97 ft (normal load)
   128,97 m / 128,00 m x 20,00 m  x 7,00 m

Armament:
      6 - 12,00" / 305 mm guns (3x2 guns), 864,00lbs / 391,90kg shells, 1917 Model
     Breech loading guns in turrets (on barbettes)
     on centreline ends, majority forward, 1 raised mount - superfiring
      10 - 6,00" / 152 mm guns in single mounts, 108,00lbs / 48,99kg shells, 1917 Model
     Breech loading guns in casemate mounts
     on side, all amidships
      2 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,89kg shells, 1917 Model
     Breech loading guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 6.268 lbs / 2.843 kg
   Shells per gun, main battery: 110

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9,84" / 250 mm   314,96 ft / 96,00 m   9,71 ft / 2,96 m
   Ends:   1,97" / 50 mm   104,95 ft / 31,99 m   9,71 ft / 2,96 m
   Upper:   3,94" / 100 mm   314,96 ft / 96,00 m   8,01 ft / 2,44 m
     Main Belt covers 115 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   9,84" / 250 mm   5,91" / 150 mm      7,87" / 200 mm

   - Armour deck: 1,97" / 50 mm, Conning tower: 7,87" / 200 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 21.520 shp / 16.054 Kw = 21,00 kts
   Range 4.500nm at 12,00 kts
   Bunker at max displacement = 1.425 tons

Complement:
   548 - 713

Cost:
   £2,183 million / $8,731 million

Distribution of weights at normal displacement:
   Armament: 783 tons, 6,9 %
   Armour: 3.490 tons, 30,8 %
      - Belts: 1.774 tons, 15,7 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 879 tons, 7,8 %
      - Armour Deck: 752 tons, 6,6 %
      - Conning Tower: 86 tons, 0,8 %
   Machinery: 1.397 tons, 12,3 %
   Hull, fittings & equipment: 4.087 tons, 36,1 %
   Fuel, ammunition & stores: 1.412 tons, 12,5 %
   Miscellaneous weights: 150 tons, 1,3 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     10.698 lbs / 4.853 Kg = 12,4 x 12,0 " / 305 mm shells or 1,6 torpedoes
   Stability (Unstable if below 1.00): 1,04
   Metacentric height 2,9 ft / 0,9 m
   Roll period: 16,3 seconds
   Steadiness   - As gun platform (Average = 50 %): 52 %
         - Recoil effect (Restricted arc if above 1.00): 0,92
   Seaboat quality  (Average = 1.00): 1,05

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,626
   Length to Beam Ratio: 6,40 : 1
   'Natural speed' for length: 20,49 kts
   Power going to wave formation at top speed: 53 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   Bow angle (Positive = bow angles forward): 10,00 degrees
   Stern overhang: 0,00 ft / 0,00 m
   Freeboard (% = measuring location as a percentage of overall length):
      - Stem:      18,04 ft / 5,50 m
      - Forecastle (10 %):   14,34 ft / 4,37 m
      - Mid (50 %):      14,34 ft / 4,37 m
      - Quarterdeck (15 %):   14,34 ft / 4,37 m
      - Stern:      14,34 ft / 4,37 m
      - Average freeboard:   14,49 ft / 4,42 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 93,8 %
      - Above water (accommodation/working, high = better): 102,9 %
   Waterplane Area: 20.649 Square feet or 1.918 Square metres
   Displacement factor (Displacement / loading): 89 %
   Structure weight / hull surface area: 138 lbs/sq ft or 672 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,93
      - Longitudinal: 1,84
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate