Syjamski POW

 W nawiązaniu do dyskusji pod postem o krążowniku Wilhelma II, prezentuję pierwszy z okrętów dla Królestwa Syjamu. Jest to pancernik obrony wybrzeża, jak widać po sylwetce wzorowany nieco na niemieckich okrętach typów Siegfried/Odin, różniące się od nich jednak paroma elementami. Przede wszystkim, uzbrojenie jest liczniejsze o 1 działo 240 mm, a układ artylerii jest wzorowany na pancernikach francuskich – po 1 dziale rozmieszczono w osi symetrii na dziobie i na rufie a 2 po bokach kadłuba na śródokręciu. Pozwala to przynajmniej teoretycznie prowadzić ogień w każdym kierunku z 3 dział. Nie obyło się przy tym bez zwiększenia wymiarów i wyporności, która wynosi 4070 ton. Okręty są chronione pancerzem na burtach 250 mm, na barbetach 200 mm oraz na stanowisku dowodzenia 200 mm. 

Thongduang, siamese coast defence battleship laid down 1891 (Engine 1892)

Displacement:
    3 667 t light; 3 822 t standard; 4 070 t normal; 4 269 t full load

Dimensions: Length overall / water x beam x draught
    267,45 ft / 267,45 ft x 49,93 ft x 18,11 ft (normal load)
    81,52 m / 81,52 m x 15,22 m  x 5,52 m

Armament:
      2 - 9,45" / 240 mm guns in single mounts, 409,14lbs / 185,58kg shells, 1888 Model
      Breech loading guns in turrets (on barbettes)
      on centreline ends, evenly spread
      2 - 9,45" / 240 mm guns in single mounts, 409,14lbs / 185,58kg shells, 1888 Model
      Breech loading guns in turrets (on barbettes)
      on side, all amidships
      6 - 3,46" / 88,0 mm guns in single mounts, 20,79lbs / 9,43kg shells, 1890 Model
      Quick firing guns in deck mounts
      on side, all amidships
      2 - 1,97" / 50,0 mm guns in single mounts, 3,81lbs / 1,73kg shells, 1892 Model
      Quick firing guns in casemate mounts
      on side, all forward
      2 - 1,97" / 50,0 mm guns in single mounts, 3,81lbs / 1,73kg shells, 1892 Model
      Quick firing guns in deck mounts
      on side, all aft, all raised mounts - superfiring
    Weight of broadside 1 777 lbs / 806 kg
    Shells per gun, main battery: 70
    3 - 13,8" / 350 mm submerged torpedo tubes

Armour:
   - Belts:        Width (max)    Length (avg)        Height (avg)
    Main:    9,84" / 250 mm    143,73 ft / 43,81 m    8,27 ft / 2,52 m
    Ends:    Unarmoured
      Main Belt covers 83% of normal length
      Main belt does not fully cover magazines and engineering spaces

   - Gun armour:    Face (max)    Other gunhouse (avg)    Barbette/hoist (max)
    Main:    1,97" / 50 mm    1,97" / 50 mm        7,87" / 200 mm
    2nd:    1,97" / 50 mm    1,97" / 50 mm        7,87" / 200 mm
    3rd:    1,18" / 30 mm    0,79" / 20 mm              -
    4th:    1,97" / 50 mm          -                  -
    5th:    0,79" / 20 mm    0,59" / 15 mm              -

   - Armour deck: 1,38" / 35 mm, Conning tower: 7,87" / 200 mm

Machinery:
    Coal fired boilers, complex reciprocating steam engines,
    Direct drive, 2 shafts, 4 090 ihp / 3 051 Kw = 15,50 kts
    Range 2 600nm at 10,00 kts
    Bunker at max displacement = 447 tons (100% coal)

Complement:
    254 - 331

Cost:
    £0,416 million / $1,663 million

Distribution of weights at normal displacement:
    Armament: 222 tons, 5,5%
    Armour: 1 154 tons, 28,3%
       - Belts: 551 tons, 13,5%
       - Torpedo bulkhead: 0 tons, 0,0%
       - Armament: 314 tons, 7,7%
       - Armour Deck: 246 tons, 6,1%
       - Conning Tower: 43 tons, 1,1%
    Machinery: 720 tons, 17,7%
    Hull, fittings & equipment: 1 570 tons, 38,6%
    Fuel, ammunition & stores: 404 tons, 9,9%
    Miscellaneous weights: 0 tons, 0,0%

Overall survivability and seakeeping ability:
    Survivability (Non-critical penetrating hits needed to sink ship):
      3 830 lbs / 1 737 Kg = 9,1 x 9,4 " / 240 mm shells or 0,9 torpedoes
    Stability (Unstable if below 1.00): 1,09
    Metacentric height 2,1 ft / 0,6 m
    Roll period: 14,6 seconds
    Steadiness    - As gun platform (Average = 50 %): 82 %
            - Recoil effect (Restricted arc if above 1.00): 0,91
    Seaboat quality  (Average = 1.00): 1,65

Hull form characteristics:
    Hull has rise forward of midbreak
    Block coefficient: 0,589
    Length to Beam Ratio: 5,36 : 1
    'Natural speed' for length: 16,35 kts
    Power going to wave formation at top speed: 50 %
    Trim (Max stability = 0, Max steadiness = 100): 50
    Bow angle (Positive = bow angles forward): -35,00 degrees
    Stern overhang: 0,00 ft / 0,00 m
    Freeboard (% = measuring location as a percentage of overall length):
       - Stem:        13,45 ft / 4,10 m
       - Forecastle (19%):    13,45 ft / 4,10 m
       - Mid (75%):        17,45 ft / 5,32 m (8,99 ft / 2,74 m aft of break)
       - Quarterdeck (12%):    8,99 ft / 2,74 m
       - Stern:        8,99 ft / 2,74 m
       - Average freeboard:    13,43 ft / 4,09 m
    Ship tends to be wet forward

Ship space, strength and comments:
    Space    - Hull below water (magazines/engines, low = better): 104,1%
        - Above water (accommodation/working, high = better): 103,0%
    Waterplane Area: 9 668 Square feet or 898 Square metres
    Displacement factor (Displacement / loading): 93%
    Structure weight / hull surface area: 107 lbs/sq ft or 521 Kg/sq metre
    Hull strength (Relative):
        - Cross-sectional: 0,87
        - Longitudinal: 3,31
        - 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

Thongduang (1892)
Mongkut (1893)