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Dec 15th, 2019
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  1. Palami, Selkum Coastal Gunboat laid down 1930
  2.  
  3. Displacement:
  4. 714 t light; 746 t standard; 750 t normal; 753 t full load
  5.  
  6. Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
  7. (280.31 ft / 278.87 ft) x 22.97 ft x (12.14 / 12.17 ft)
  8. (85.44 m / 85.00 m) x 7.00 m x (3.70 / 3.71 m)
  9.  
  10. Armament:
  11. 2 - 5.91" / 150 mm 45.0 cal guns - 103.86lbs / 47.11kg shells, 150 per gun
  12. Breech loading guns in deck mounts, 1930 Model
  13. 2 x Single mounts on centreline, evenly spread
  14. Weight of broadside 208 lbs / 94 kg
  15.  
  16. Armour:
  17. - Belts: Width (max) Length (avg) Height (avg)
  18. Main: 2.17" / 55 mm 181.27 ft / 55.25 m 5.74 ft / 1.75 m
  19. Ends: 0.20" / 5 mm 97.57 ft / 29.74 m 5.74 ft / 1.75 m
  20. Upper: 0.98" / 25 mm 181.27 ft / 55.25 m 8.01 ft / 2.44 m
  21. Main Belt covers 100 % of normal length
  22.  
  23. - Gun armour: Face (max) Other gunhouse (avg) Barbette/hoist (max)
  24. Main: 0.98" / 25 mm - -
  25.  
  26. - Armoured deck - multiple decks:
  27. For and Aft decks: 0.98" / 25 mm
  28. Forecastle: 0.39" / 10 mm Quarter deck: 0.39" / 10 mm
  29.  
  30. Machinery:
  31. Oil fired boilers, steam turbines,
  32. Hydraulic drive, 2 shafts, 2,835 shp / 2,115 Kw = 19.00 kts
  33. Range 0nm at 15.00 kts
  34. Bunker at max displacement = 7 tons
  35.  
  36. Complement:
  37. 71 - 93
  38.  
  39. Cost:
  40. £0.196 million / $0.783 million
  41.  
  42. Distribution of weights at normal displacement:
  43. Armament: 31 tons, 4.1 %
  44. - Guns: 31 tons, 4.1 %
  45. Armour: 221 tons, 29.4 %
  46. - Belts: 152 tons, 20.2 %
  47. - Armament: 5 tons, 0.7 %
  48. - Armour Deck: 63 tons, 8.5 %
  49. Machinery: 86 tons, 11.5 %
  50. Hull, fittings & equipment: 376 tons, 50.2 %
  51. Fuel, ammunition & stores: 36 tons, 4.8 %
  52. Miscellaneous weights: 0 tons, 0.0 %
  53.  
  54. Overall survivability and seakeeping ability:
  55. Survivability (Non-critical penetrating hits needed to sink ship):
  56. 1,942 lbs / 881 Kg = 18.9 x 5.9 " / 150 mm shells or 1.2 torpedoes
  57. Stability (Unstable if below 1.00): 1.01
  58. Metacentric height 0.6 ft / 0.2 m
  59. Roll period: 12.9 seconds
  60. Steadiness - As gun platform (Average = 50 %): 36 %
  61. - Recoil effect (Restricted arc if above 1.00): 0.60
  62. Seaboat quality (Average = 1.00): 1.44
  63.  
  64. Hull form characteristics:
  65. Hull has rise forward of midbreak,
  66. a normal bow and small transom stern
  67. Block coefficient (normal/deep): 0.338 / 0.338
  68. Length to Beam Ratio: 12.14 : 1
  69. 'Natural speed' for length: 18.00 kts
  70. Power going to wave formation at top speed: 36 %
  71. Trim (Max stability = 0, Max steadiness = 100): 18
  72. Bow angle (Positive = bow angles forward): 5.00 degrees
  73. Stern overhang: 0.00 ft / 0.00 m
  74. Freeboard (% = length of deck as a percentage of waterline length):
  75. Fore end, Aft end
  76. - Forecastle: 20.00 %, 16.40 ft / 5.00 m, 14.76 ft / 4.50 m
  77. - Forward deck: 30.00 %, 14.76 ft / 4.50 m, 14.76 ft / 4.50 m
  78. - Aft deck: 35.00 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
  79. - Quarter deck: 15.00 %, 8.20 ft / 2.50 m, 8.20 ft / 2.50 m
  80. - Average freeboard: 11.61 ft / 3.54 m
  81. Ship tends to be wet forward
  82.  
  83. Ship space, strength and comments:
  84. Space - Hull below water (magazines/engines, low = better): 51.8 %
  85. - Above water (accommodation/working, high = better): 117.2 %
  86. Waterplane Area: 3,891 Square feet or 362 Square metres
  87. Displacement factor (Displacement / loading): 154 %
  88. Structure weight / hull surface area: 41 lbs/sq ft or 200 Kg/sq metre
  89. Hull strength (Relative):
  90. - Cross-sectional: 0.90
  91. - Longitudinal: 5.03
  92. - Overall: 1.07
  93. Excellent machinery, storage, compartmentation space
  94. Adequate accommodation and workspace room
  95. Good seaboat, rides out heavy weather easily
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