Persian battleships

[ledeper]

Cyrus the Great
Former Orange CDBB  laid down 1885

Barbette ship

Displacement:
   8,000 t light; 8,304 t standard; 9,212 t normal; 9,939 t full load

Dimensions: Length overall / water x beam x draught
   380.00 ft / 380.00 ft x 65.00 ft x 22.00 ft (normal load)
   115.82 m / 115.82 m x 19.81 m  x 6.71 m

Armament:
      4 - 10.00" / 254 mm guns (2x2 guns), 462.50lbs / 209.79kg shells, 1885 Model
     Breech loading guns in open barbettes
     on centreline ends, evenly spread
      12 - 5.00" / 127 mm guns in single mounts, 57.81lbs / 26.22kg shells, 1885 Model
     Breech loading guns in casemate mounts
     on side, all amidships
   Weight of broadside 2,544 lbs / 1,154 kg
   Shells per gun, main battery: 80
   12 - 18.0" / 457.2 mm submerged torpedo tubes

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   8.80" / 224 mm   230.00 ft / 70.10 m   10.00 ft / 3.05 m
   Ends:   5.50" / 140 mm   150.00 ft / 45.72 m   8.00 ft / 2.44 m
   Upper:   5.50" / 140 mm   230.00 ft / 70.10 m   11.00 ft / 3.35 m
     Main Belt covers 93 % of normal length

   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:         -            -         11.0" / 279 mm
   2nd:   5.50" / 140 mm   1.00" / 25 mm      1.00" / 25 mm

   - Armour deck: 2.20" / 56 mm, Conning tower: 11.00" / 279 mm

Machinery:
   Coal fired boilers, complex reciprocating steam engines,
   Direct drive, 2 shafts, 7,187 ihp / 5,362 Kw = 16.00 kts
   Range 5,000nm at 10.00 kts
   Bunker at max displacement = 1,635 tons (100% coal)

Complement:
   469 - 611

Cost:
   £0.743 million / $2.971 million

Distribution of weights at normal displacement:
   Armament: 318 tons, 3.5 %
   Armour: 3,287 tons, 35.7 %
      - Belts: 1,781 tons, 19.3 %
      - Torpedo bulkhead: 0 tons, 0.0 %
      - Armament: 671 tons, 7.3 %
      - Armour Deck: 731 tons, 7.9 %
      - Conning Tower: 104 tons, 1.1 %
   Machinery: 1,397 tons, 15.2 %
   Hull, fittings & equipment: 2,929 tons, 31.8 %
   Fuel, ammunition & stores: 1,212 tons, 13.2 %
   Miscellaneous weights: 70 tons, 0.8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     9,384 lbs / 4,257 Kg = 20.3 x 10.0 " / 254 mm shells or 1.5 torpedoes
   Stability (Unstable if below 1.00): 1.32
   Metacentric height 4.3 ft / 1.3 m
   Roll period: 13.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 86 %
         - Recoil effect (Restricted arc if above 1.00): 0.25
   Seaboat quality  (Average = 1.00): 1.72

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0.593
   Length to Beam Ratio: 5.85 : 1
   'Natural speed' for length: 19.49 kts
   Power going to wave formation at top speed: 41 %
   Trim (Max stability = 0, Max steadiness = 100): 50
   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:      16.00 ft / 4.88 m
      - Forecastle (20 %):   14.00 ft / 4.27 m
      - Mid (50 %):      14.00 ft / 4.27 m
      - Quarterdeck (15 %):   14.00 ft / 4.27 m
      - Stern:      14.00 ft / 4.27 m
      - Average freeboard:   14.16 ft / 4.32 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 92.4 %
      - Above water (accommodation/working, high = better): 102.1 %
   Waterplane Area: 17,953 Square feet or 1,668 Square metres
   Displacement factor (Displacement / loading): 106 %
   Structure weight / hull surface area: 114 lbs/sq ft or 556 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.93
      - Longitudinal: 1.83
      - 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

Scrapped 1913

[ledeper]

Kambyses, Persia CDBB laid down 1913 (Engine 1906)

Displacement:
   4.485 t light; 4.800 t standard; 5.370 t normal; 5.826 t full load

Dimensions: Length overall / water x beam x draught
   291,90 ft / 288,71 ft x 49,21 ft x 19,69 ft (normal load)
   88,97 m / 88,00 m x 15,00 m  x 6,00 m

Armament:
      4 - 10,00" / 254 mm guns (2x2 guns), 462,50lbs / 209,79kg shells, 1885 Model
     Breech loading guns in deck mounts
     on centreline ends, evenly spread, 1 raised mount
      10 - 6,00" / 152 mm guns in single mounts, 108,00lbs / 48,99kg shells, 1913 Model
     Breech loading guns in casemate mounts
     on side, all amidships
      2 - 1,57" / 40,0 mm guns in single mounts, 1,95lbs / 0,88kg shells, 1913 Model
     Breech loading guns in deck mounts
     on side, evenly spread, all raised mounts
   Weight of broadside 2.934 lbs / 1.331 kg
   Shells per gun, main battery: 120

Armour:
   - Belts:      Width (max)   Length (avg)      Height (avg)
   Main:   9,84" / 250 mm   192,59 ft / 58,70 m   9,42 ft / 2,87 m
   Ends:   1,97" / 50 mm   101,02 ft / 30,79 m   8,43 ft / 2,57 m
   Upper:   3,94" / 100 mm   187,66 ft / 57,20 m   8,01 ft / 2,44 m
     Main Belt covers 103 % of normal length

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

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

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 3 shafts, 11.989 shp / 8.944 Kw = 19,45 kts
   Range 5.000nm at 12,00 kts
   Bunker at max displacement = 1.026 tons

Complement:
   313 - 407

Cost:
   £0,626 million / $2,505 million

Distribution of weights at normal displacement:
   Armament: 367 tons, 6,8 %
   Armour: 1.794 tons, 33,4 %
      - Belts: 1.113 tons, 20,7 %
      - Torpedo bulkhead: 0 tons, 0,0 %
      - Armament: 225 tons, 4,2 %
      - Armour Deck: 404 tons, 7,5 %
      - Conning Tower: 52 tons, 1,0 %
   Machinery: 778 tons, 14,5 %
   Hull, fittings & equipment: 1.396 tons, 26,0 %
   Fuel, ammunition & stores: 885 tons, 16,5 %
   Miscellaneous weights: 150 tons, 2,8 %

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     5.223 lbs / 2.369 Kg = 10,4 x 10,0 " / 254 mm shells or 1,0 torpedoes
   Stability (Unstable if below 1.00): 1,25
   Metacentric height 2,6 ft / 0,8 m
   Roll period: 12,8 seconds
   Steadiness   - As gun platform (Average = 50 %): 54 %
         - Recoil effect (Restricted arc if above 1.00): 0,56
   Seaboat quality  (Average = 1.00): 1,09

Hull form characteristics:
   Hull has a flush deck
   Block coefficient: 0,672
   Length to Beam Ratio: 5,87 : 1
   'Natural speed' for length: 16,99 kts
   Power going to wave formation at top speed: 61 %
   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 (20 %):   13,81 ft / 4,21 m
      - Mid (50 %):      13,81 ft / 4,21 m
      - Quarterdeck (15 %):   13,81 ft / 4,21 m
      - Stern:      13,81 ft / 4,21 m
      - Average freeboard:   14,15 ft / 4,31 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 102,0 %
      - Above water (accommodation/working, high = better): 93,3 %
   Waterplane Area: 11.105 Square feet or 1.032 Square metres
   Displacement factor (Displacement / loading): 83 %
   Structure weight / hull surface area: 81 lbs/sq ft or 397 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0,88
      - Longitudinal: 2,86
      - Overall: 1,00
   Hull space for machinery, storage, compartmentation is adequate
   Room for accommodation and workspaces is adequate

Warning: Armour belts longer than ship