DD-M Class

[TacCovert4]

DD-M, Aztec Destroyer laid down 1932

Displacement:
   1,581 t light; 1,681 t standard; 1,882 t normal; 2,043 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (366.17 ft / 360.89 ft) x 31.17 ft x (11.48 / 12.23 ft)
   (111.61 m / 110.00 m) x 9.50 m  x (3.50 / 3.73 m)

Armament:
      4 - 4.72" / 120 mm 55.0 cal guns - 56.91lbs / 25.81kg shells, 400 per gun
     Dual purpose guns in deck mounts, 1932 Model
     4 x Single mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      4 - 1.57" / 40.0 mm 55.0 cal guns - 2.11lbs / 0.96kg shells, 1,000 per gun
     Anti-air guns in deck mounts, 1932 Model
     2 x Single mounts on centreline, aft deck forward
     2 x Single mounts on centreline, forward deck aft
      10 - 1.18" / 30.0 mm 50.0 cal guns - 0.87lbs / 0.40kg shells, 1,500 per gun
     Anti-air guns in deck mounts, 1932 Model
     10 x Twin mounts on side ends, majority forward
      Weight of broadside 245 lbs / 111 kg

Armour:
   - Gun armour:   Face (max)   Other gunhouse (avg)   Barbette/hoist (max)
   Main:   1.06" / 27 mm   1.06" / 27 mm            -
   2nd:   0.79" / 20 mm         -               -

   - Conning towers: Forward 1.06" / 27 mm, Aft 0.00" / 0 mm

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 41,234 shp / 30,761 Kw = 32.80 kts
   Range 5,000nm at 14.00 kts
   Bunker at max displacement = 362 tons

Complement:
   142 - 185

Cost:
   £0.938 million / $3.754 million

Distribution of weights at normal displacement:
   Armament: 58 tons, 3.1 %
      - Guns: 58 tons, 3.1 %
   Armour: 34 tons, 1.8 %
      - Armament: 30 tons, 1.6 %
      - Conning Tower: 3 tons, 0.2 %
   Machinery: 975 tons, 51.8 %
   Hull, fittings & equipment: 435 tons, 23.1 %
   Fuel, ammunition & stores: 301 tons, 16.0 %
   Miscellaneous weights: 80 tons, 4.3 %
      - Hull below water: 15 tons
      - On freeboard deck: 34 tons
      - Above deck: 31 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     465 lbs / 211 Kg = 8.8 x 4.7 " / 120 mm shells or 0.3 torpedoes
   Stability (Unstable if below 1.00): 1.16
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 12.2 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.36
   Seaboat quality  (Average = 1.00): 1.02

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.510 / 0.520
   Length to Beam Ratio: 11.58 : 1
   'Natural speed' for length: 19.00 kts
   Power going to wave formation at top speed: 67 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   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 %,  19.69 ft / 6.00 m,  19.69 ft / 6.00 m
      - Forward deck:   30.00 %,  19.69 ft / 6.00 m,  18.04 ft / 5.50 m
      - Aft deck:   35.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Quarter deck:   15.00 %,  9.84 ft / 3.00 m,  9.84 ft / 3.00 m
      - Average freeboard:      14.52 ft / 4.43 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 178.1 %
      - Above water (accommodation/working, high = better): 142.1 %
   Waterplane Area: 7,563 Square feet or 703 Square metres
   Displacement factor (Displacement / loading): 70 %
   Structure weight / hull surface area: 30 lbs/sq ft or 148 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.63
      - Overall: 0.56
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

15t -Advanced  Hydrophones
12t - Depth Charges
2t - 2 x DC Thrower
20t - 1 x 5 x 21in HW TT Centerline
6t - 1918 FC
25t - NF Devices