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Rio Grande class DestroyerEdit

DisplacementEdit

     1,688 t light; 1,748 t standard; 2,001 t normal; 2,203 t full load

DimensionsEdit

     Length (overall / waterline) x beam x draught (normal/deep)
     (387.81 ft / 385.00 ft) x 31.00 ft x (18.00 / 18.98 ft)
     (118.20 m / 117.35 m) x 9.45 m  x (5.49 / 5.78 m)

ArmamentEdit

     5 - 5.00" / 127 mm 38.0 cal guns - 59.33lbs / 26.91kg shells, 100 per gun
       Quick firing guns in deck and hoist mounts, 1922 Model
       1 x Single mount on centreline forward
           1 raised mount - superfiring
       2 x 2-gun mounts on centreline ends, evenly spread
     16 - 1.57" / 40.0 mm 42.0 cal guns - 1.76lbs / 0.80kg shells, 400 per gun
       Anti-air guns in deck mounts, 1922 Model
       8 x Twin mounts on sides, evenly spread
     4 - 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, evenly spread
     Weight of broadside 325 lbs / 147 kg
     
     Main Torpedoes
       6 - 21.0" / 533 mm, 8.00 ft / 2.44 m torpedoes - 0.621 t each, 3.727 t total
           In 2 sets of deck mounted carriage/fixed tubes
     2nd Torpedoes
       18 - 21.0" / 533 mm, 8.00 ft / 2.44 m torpedoes - 0.613 t each, 11.037 t total
           below water reloads
     
     Main DC/AS Mortars
       2 - 450.00 lbs / 204.12 kg Depth Charges + 80 reloads - 16.473 t total
           in Stern depth charge racks
     2nd DC/AS Mortars
       2 - 450.00 lbs / 204.12 kg Depth Charges + 40 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, 
     Geared drive, 3 shafts, 42,550 shp / 31,742 Kw = 34.50 kts
     Range 7,200nm at 12.00 kts
     Bunker at max displacement = 455 tons

ComplementEdit

     149 - 194

CostEdit

     £0.769 million / $3.075 million

Distribution of weights at normal displacementEdit

     Armament: 117 tons, 5.8 %
       - Guns: 71 tons, 3.5 %
       - Weapons: 46 tons, 2.3 %
     Armour: 26 tons, 1.3 %
       - Armament: 26 tons, 1.3 %
     Machinery: 1,078 tons, 53.9 %
     Hull, fittings & equipment: 468 tons, 23.4 %
     Fuel, ammunition & stores: 313 tons, 15.6 %
     Miscellaneous weights: 0 tons, 0.0 %

Overall survivability and seakeeping abilityEdit

     Survivability (Non-critical penetrating hits needed to sink ship):
       346 lbs / 157 Kg = 5.5 x 5.0 " / 127 mm shells or 0.5 torpedoes
     Stability (Unstable if below 1.00): 1.20
     Metacentric height 1.2 ft / 0.4 m
     Roll period: 11.8 seconds
     Steadiness	- As gun platform (Average = 50 %): 70 %
                       - Recoil effect (Restricted arc if above 1.00): 0.65
     Seaboat quality  (Average = 1.00): 1.13

Hull form characteristicsEdit

     Hull has rise forward of midbreak,
      a normal bow and small transom stern
     Block coefficient (normal/deep): 0.326 / 0.340
     Length to Beam Ratio: 12.42 : 1
     'Natural speed' for length: 21.15 kts
     Power going to wave formation at top speed: 59 %
     Trim (Max stability = 0, Max steadiness = 100): 62
     Bow angle (Positive = bow angles forward): 8.00 degrees
     Stern overhang: 0.00 ft / 0.00 m
     Freeboard (% = length of deck as a percentage of waterline length):
                                   Fore end,	 Aft end
       - Forecastle:	20.00 %,  20.00 ft / 6.10 m,  16.00 ft / 4.88 m
       - Forward deck:	20.00 %,  16.00 ft / 4.88 m,  16.00 ft / 4.88 m
       - Aft deck:	45.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
       - Quarter deck:	15.00 %,  10.00 ft / 3.05 m,  10.00 ft / 3.05 m
       - Average freeboard:		12.72 ft / 3.88 m
     Ship tends to be wet forward

Ship space, strength and commentsEdit

     Space	- Hull below water (magazines/engines, low = better): 189.2 %
               - Above water (accommodation/working, high = better): 108.1 %
     Waterplane Area: 7,220 Square feet or 671 Square metres
     Displacement factor (Displacement / loading): 66 %
     Structure weight / hull surface area: 33 lbs/sq ft or 159 Kg/sq metre
     Hull strength (Relative):
           - Cross-sectional: 0.45
           - Longitudinal: 1.47
           - Overall: 0.51
     Cramped machinery, storage, compartmentation space
     Adequate accommodation and workspace room
     Ship has slow, easy roll, a good, steady gun platform

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

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