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San Juan class Light Cruiser Edit

San Juan, Mexico Light Cruiser laid down 1925 (Engine 1926)

DisplacementEdit

     9,065 t light; 9,388 t standard; 9,974 t normal; 10,442 t full load

DimensionsEdit

     Length (overall / waterline) x beam x draught (normal/deep)
     (630.03 ft / 600.00 ft) x 62.00 ft x (24.00 / 24.72 ft)
     (192.03 m / 182.88 m) x 18.90 m  x (7.32 / 7.53 m)

ArmamentEdit

     10 - 6.00" / 152 mm 47.0 cal guns - 112.34lbs / 50.96kg shells, 120 per gun
       Quick firing guns in turret on barbette mounts, 1925 Model
       4 x Twin mounts on centreline ends, evenly spread
           2 raised mounts - superfiring
       2 x Single mounts on sides amidships
     8 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 120 per gun
       Quick firing guns in deck and hoist mounts, 1916 Model
       8 x Single mounts on sides, evenly spread
     32 - 1.57" / 40.0 mm 39.0 cal guns - 1.86lbs / 0.84kg shells, 500 per gun
       Anti-air guns in deck mounts, 1922 Model
       8 x 2 row quad mounts on sides, evenly spread
     8 - 0.50" / 12.7 mm 90.0 cal guns - 0.07lbs / 0.03kg shells, 1,000 per gun
       Machine guns in deck mounts, 1909 Model
       4 x Single mounts on sides, aft deck aft
       4 x Single mounts on sides, forward deck aft
     Weight of broadside 1,658 lbs / 752 kg
     
     Main Torpedoes
       6 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.449 t each, 8.695 t total
           In 2 sets of deck mounted carriage/fixed tubes
     2nd Torpedoes
       30 - 21.0" / 533 mm, 22.00 ft / 6.71 m torpedoes - 1.449 t each, 43.475 t total
           below water reloads
     
     Main DC/AS Mortars
       2 - 450.00 lbs / 204.12 kg Depth Charges + 50 reloads - 10.446 t total
           in Stern depth charge racks
     2nd DC/AS Mortars
       2 - 450.00 lbs / 204.12 kg Depth Charges + 20 reloads - 4.420 t total
           in Depth charge throwers

ArmourEdit

     - Belts:		Width (max)	Length (avg)		Height (avg)
       Main:	5.50" / 140 mm	390.00 ft / 118.87 m	12.00 ft / 3.66 m
       Ends:	Unarmoured
     Main Belt covers 100 % of normal length
     Main Belt inclined 14.00 degrees (positive = in)
     
     - Torpedo Bulkhead - Strengthened structural bulkheads:
       3.00" / 76 mm	500.00 ft / 152.40 m	23.00 ft / 7.01 m
     Beam between torpedo bulkheads 62.00 ft / 18.90 m
     
     - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
       Main:	6.00" / 152 mm	3.00" / 76 mm		5.00" / 127 mm
       2nd:	2.00" / 51 mm	1.00" / 25 mm		1.00" / 25 mm
     
     - Armoured deck - single deck:
     For and Aft decks: 2.00" / 51 mm
     Forecastle: 0.00" / 0 mm  
     Quarter deck: 1.00" / 25 mm
     
     - Conning towers: Forward 6.00" / 152 mm, Aft 0.00" / 0 mm

MachineryEdit

     Oil fired boilers, steam turbines, 
     Geared drive, 3 shafts, 80,136 shp / 59,781 Kw = 32.00 kts
     Range 6,700nm at 12.00 kts
     Bunker at max displacement = 1,054 tons

ComplementEdit

     498 - 648

CostEdit

     £2.713 million / $10.853 million

Distribution of weights at normal displacementEdit

     Armament: 497 tons, 5.0 %
       - Guns: 412 tons, 4.1 %
       - Weapons: 85 tons, 0.9 %
     Armour: 3,655 tons, 36.6 %
       - Belts: 1,050 tons, 10.5 %
       - Torpedo bulkhead: 1,277 tons, 12.8 %
       - Armament: 509 tons, 5.1 %
       - Armour Deck: 760 tons, 7.6 %
       - Conning Tower: 60 tons, 0.6 %
     Machinery: 2,565 tons, 25.7 %
     Hull, fittings & equipment: 2,306 tons, 23.1 %
     Fuel, ammunition & stores: 909 tons, 9.1 %
     Miscellaneous weights: 50 tons, 0.5 %
       - On freeboard deck: 50 tons

Overall survivability and seakeeping abilityEdit

     Survivability (Non-critical penetrating hits needed to sink ship):
       10,128 lbs / 4,594 Kg = 93.8 x 6.0 " / 152 mm shells or 1.7 torpedoes
     Stability (Unstable if below 1.00): 1.07
     Metacentric height 2.8 ft / 0.8 m
     Roll period: 15.6 seconds
     Steadiness	- As gun platform (Average = 50 %): 70 %
                       - Recoil effect (Restricted arc if above 1.00): 0.37
     Seaboat quality  (Average = 1.00): 1.06

Hull form characteristicsEdit

     Hull has a flush deck,
      a straight bulbous bow and a cruiser stern
     Block coefficient (normal/deep): 0.391 / 0.397
     Length to Beam Ratio: 9.68 : 1
     'Natural speed' for length: 24.49 kts
     Power going to wave formation at top speed: 52 %
     Trim (Max stability = 0, Max steadiness = 100): 66
     Bow angle (Positive = bow angles forward): 47.00 degrees
     Stern overhang: 0.00 ft / 0.00 m
     Freeboard (% = length of deck as a percentage of waterline length):
                                   Fore end,	 Aft end
       - Forecastle:	15.00 %,  28.00 ft / 8.53 m,  18.00 ft / 5.49 m
       - Forward deck:	30.00 %,  18.00 ft / 5.49 m,  14.00 ft / 4.27 m
       - Aft deck:	40.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
       - Quarter deck:	15.00 %,  14.00 ft / 4.27 m,  14.00 ft / 4.27 m
       - Average freeboard:		15.80 ft / 4.82 m

Ship space, strength and commentsEdit

     Space	- Hull below water (magazines/engines, low = better): 99.9 %
               - Above water (accommodation/working, high = better): 128.0 %
     Waterplane Area: 22,759 Square feet or 2,114 Square metres
     Displacement factor (Displacement / loading): 97 %
     Structure weight / hull surface area: 106 lbs/sq ft or 516 Kg/sq metre
     Hull strength (Relative):
           - Cross-sectional: 0.98
           - Longitudinal: 1.21
           - Overall: 1.00
     Adequate machinery, storage, compartmentation space
     Excellent accommodation and workspace room
     Ship has slow, easy roll, a good, steady gun platform

OtherEdit

50kt is for 2x Seaplanes stored on aft deck

Torpedoes are ~ US 21" Mk11 Depth Charges are ~US Mk3 with extra weight for faster sink speed

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