DD-D Class

[TacCovert4]

DD-D, Aztec Destroyer laid down 1918

Displacement:
   1,500 t light; 1,579 t standard; 1,815 t normal; 2,004 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (391.71 ft / 387.14 ft) x 32.28 ft x (11.96 / 12.80 ft)
   (119.39 m / 118.00 m) x 9.84 m  x (3.65 / 3.90 m)

Armament:
      5 - 5.12" / 130 mm 50.0 cal guns - 70.97lbs / 32.19kg shells, 200 per gun
     Quick firing guns in deck mounts, 1918 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
     1 x Single mount on centreline, aft deck forward
      1 - 2.76" / 70.0 mm 50.0 cal gun - 11.09lbs / 5.03kg shells, 300 per gun
     Anti-air gun in deck mount, 1918 Model
     1 x Single mount on centreline, forward deck aft
      1 raised mount
      8 - 0.47" / 12.0 mm 70.0 cal guns - 0.07lbs / 0.03kg shells, 3,000 per gun
     Machine guns in deck mounts, 1918 Model
     4 x Twin mounts on sides, evenly spread
      Weight of broadside 366 lbs / 166 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   0.98" / 25 mm         -               -

   - Conning towers: Forward 0.98" / 25 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Direct drive, 2 shafts, 35,819 shp / 26,721 Kw = 32.61 kts
   Range 4,980nm at 14.00 kts
   Bunker at max displacement = 425 tons

Complement:
   138 - 180

Cost:
   £0.417 million / $1.667 million

Distribution of weights at normal displacement:
   Armament: 71 tons, 3.9 %
      - Guns: 71 tons, 3.9 %
   Armour: 16 tons, 0.9 %
      - Armament: 13 tons, 0.7 %
      - Conning Tower: 3 tons, 0.2 %
   Machinery: 973 tons, 53.6 %
   Hull, fittings & equipment: 396 tons, 21.8 %
   Fuel, ammunition & stores: 315 tons, 17.3 %
   Miscellaneous weights: 44 tons, 2.4 %
      - Hull below water: 5 tons
      - Hull above water: 5 tons
      - On freeboard deck: 30 tons
      - Above deck: 4 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     400 lbs / 182 Kg = 6.0 x 5.1 " / 130 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.29
   Metacentric height 1.4 ft / 0.4 m
   Roll period: 11.3 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.39
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.425 / 0.438
   Length to Beam Ratio: 11.99 : 1
   'Natural speed' for length: 19.68 kts
   Power going to wave formation at top speed: 62 %
   Trim (Max stability = 0, Max steadiness = 100): 70
   Bow angle (Positive = bow angles forward): 15.00 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 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Forward deck:   30.00 %,  17.06 ft / 5.20 m,  17.06 ft / 5.20 m
      - Aft deck:   35.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Quarter deck:   15.00 %,  8.20 ft / 2.50 m,  8.20 ft / 2.50 m
      - Average freeboard:      12.63 ft / 3.85 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 185.1 %
      - Above water (accommodation/working, high = better): 132.7 %
   Waterplane Area: 7,820 Square feet or 726 Square metres
   Displacement factor (Displacement / loading): 64 %
   Structure weight / hull surface area: 31 lbs/sq ft or 149 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.98
      - Overall: 0.53
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

24t - 2x3x 21in HW TT on Centerline
6t - 60 x ASW Harpoons and Lockers (planned for refit to other ASW weapons at future date)

9t - 1912 FC
5t - Space Set Aside for Hydrophones

Trial Speed - 33.28kts