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Rio Turias class FrigateEdit

Designed to counter the increasing strength of the Colombian submarine force this model was rushed to production a year before scheduled in order to better equip the existing forces with escorts. The speed of final design led to compromises on the guns, torpedo load, and top speed but otherwise the design fulfills all requirements laid out for the class.

Rio Turias, Mexico Frigate laid down 1925

DisplacementEdit

     824 t light; 859 t standard; 1,100 t normal; 1,293 t full load

DimensionsEdit

     Length (overall / waterline) x beam x draught (normal/deep)
     (310.99 ft / 306.00 ft) x 36.50 ft x (10.00 / 10.98 ft)
     (94.79 m / 93.27 m) x 11.13 m  x (3.05 / 3.35 m)

ArmamentEdit

     3 - 5.00" / 127 mm 50.0 cal guns - 64.99lbs / 29.48kg shells, 100 per gun
       Dual purpose guns in deck and hoist mounts, 1920 Model
       1 x Twin mount on centreline, forward deck forward
       1 x Single mount on centreline, forward deck centre
           1 raised mount
     4 - 1.57" / 40.0 mm 42.0 cal guns - 1.89lbs / 0.86kg shells, 600 per gun
       Breech loading guns in deck mounts, 1922 Model
       2 x Twin mounts on centreline, aft evenly spread
           1 raised mount
     Weight of broadside 203 lbs / 92 kg
     
     Main Torpedoes
       3 - 21.0" / 533 mm, 24.00 ft / 7.32 m torpedoes - 1.563 t each, 4.690 t total
           In 1 sets of deck mounted centre rotating tubes
     2nd Torpedoes
       18 - 21.0" / 533 mm, 24.00 ft / 7.32 m torpedoes - 1.559 t each, 28.070 t total
           below water reloads
     
     Main DC/AS Mortars
       100 - 450.00 lbs / 204.12 kg Depth Charges + 2 reloads - 20.491 t total
           in Stern depth charge racks
     2nd DC/AS Mortars
       40 - 450.00 lbs / 204.12 kg Depth Charges + 2 reloads - 8.438 t total
           in Depth charge throwers

ArmourEdit

     - Gun armour:	Face (max)	Other gunhouse (avg)	Barbette/hoist (max)
       Main:	2.00" / 51 mm	1.00" / 25 mm		1.00" / 25 mm

MachineryEdit

     Oil fired boilers, steam turbines, 
     Electric motors, 2 shafts, 11,132 shp / 8,305 Kw = 27.00 kts
     Range 6,750nm at 14.00 kts
     Bunker at max displacement = 433 tons

ComplementEdit

     95 - 124

CostEdit

     £0.330 million / $1.321 million

Distribution of weights at normal displacementEdit

     Armament: 141 tons, 12.8 %
       - Guns: 58 tons, 5.3 %
       - Weapons: 83 tons, 7.5 %
     Armour: 16 tons, 1.4 %
       - Armament: 16 tons, 1.4 %
     Machinery: 361 tons, 32.9 %
     Hull, fittings & equipment: 305 tons, 27.8 %
     Fuel, ammunition & stores: 276 tons, 25.1 %
     Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping abilityEdit

     Survivability (Non-critical penetrating hits needed to sink ship):
       560 lbs / 254 Kg = 9.0 x 5.0 " / 127 mm shells or 0.3 torpedoes
     Stability (Unstable if below 1.00): 1.42
     Metacentric height 2.0 ft / 0.6 m
     Roll period: 10.8 seconds
     Steadiness	- As gun platform (Average = 50 %): 70 %
                       - Recoil effect (Restricted arc if above 1.00): 0.30
     Seaboat quality  (Average = 1.00): 1.28

Hull form characteristicsEdit

     Hull has a flush deck,
      a normal bow and large transom stern
     Block coefficient (normal/deep): 0.345 / 0.369
     Length to Beam Ratio: 8.38 : 1
     'Natural speed' for length: 20.77 kts
     Power going to wave formation at top speed: 59 %
     Trim (Max stability = 0, Max steadiness = 100): 55
     Bow angle (Positive = bow angles forward): 14.00 degrees
     Stern overhang: 0.00 ft / 0.00 m
     Freeboard (% = length of deck as a percentage of waterline length):
                                   Fore end,	 Aft end
       - Forecastle:	12.00 %,  20.00 ft / 6.10 m,  16.00 ft / 4.88 m
       - Forward deck:	25.00 %,  16.00 ft / 4.88 m,  12.00 ft / 3.66 m
       - Aft deck:	48.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
       - Quarter deck:	15.00 %,  12.00 ft / 3.66 m,  12.00 ft / 3.66 m
       - Average freeboard:		13.17 ft / 4.01 m

Ship space, strength and commentsEdit

     Space	- Hull below water (magazines/engines, low = better): 140.4 %
               - Above water (accommodation/working, high = better): 152.8 %
     Waterplane Area: 6,911 Square feet or 642 Square metres
     Displacement factor (Displacement / loading): 117 %
     Structure weight / hull surface area: 31 lbs/sq ft or 150 Kg/sq metre
     Hull strength (Relative):
           - Cross-sectional: 0.46
           - Longitudinal: 1.50
           - Overall: 0.51
     Cramped machinery, storage, compartmentation space
     Excellent accommodation and workspace room
     Ship has slow, easy roll, a good, steady gun platform
     Good seaboat, rides out heavy weather easily


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

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