DD-N Class

[TacCovert4]

N-Class, Aztec Destroyer laid down 1932

Displacement:
   2,481 t light; 2,600 t standard; 3,026 t normal; 3,366 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (465.29 ft / 459.32 ft) x 39.37 ft x (11.48 / 12.46 ft)
   (141.82 m / 140.00 m) x 12.00 m  x (3.50 / 3.80 m)

Armament:
      8 - 3.54" / 90.0 mm 55.0 cal guns - 24.01lbs / 10.89kg shells, 500 per gun
     Dual purpose guns in deck mounts, 1932 Model
     4 x Twin mounts on centreline ends, evenly spread
      2 raised mounts - superfiring
      12 - 1.18" / 30.0 mm 50.0 cal guns - 0.87lbs / 0.40kg shells, 1,000 per gun
     Quick firing guns in deck and hoist mounts, 1932 Model
     6 x Twin mounts on sides, evenly spread
      Weight of broadside 203 lbs / 92 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

   - Box over magazines:
   1.06" / 27 mm

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

Machinery:
   Oil fired boilers, steam turbines,
   Geared drive, 2 shafts, 56,977 shp / 42,505 Kw = 34.00 kts
   Range 8,000nm at 14.00 kts
   Bunker at max displacement = 766 tons

Complement:
   203 - 265

Cost:
   £1.443 million / $5.770 million

Distribution of weights at normal displacement:
   Armament: 42 tons, 1.4 %
      - Guns: 42 tons, 1.4 %
   Armour: 49 tons, 1.6 %
      - Armament: 25 tons, 0.8 %
      - Armour Deck: 19 tons, 0.6 %
      - Conning Tower: 5 tons, 0.2 %
   Machinery: 1,552 tons, 51.3 %
   Hull, fittings & equipment: 667 tons, 22.0 %
   Fuel, ammunition & stores: 545 tons, 18.0 %
   Miscellaneous weights: 171 tons, 5.7 %
      - Hull below water: 25 tons
      - Hull above water: 20 tons
      - On freeboard deck: 72 tons
      - Above deck: 54 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     825 lbs / 374 Kg = 37.1 x 3.5 " / 90 mm shells or 0.4 torpedoes
   Stability (Unstable if below 1.00): 1.31
   Metacentric height 2.0 ft / 0.6 m
   Roll period: 11.7 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.12
   Seaboat quality  (Average = 1.00): 1.01

Hull form characteristics:
   Hull has a flush deck,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.510 / 0.523
   Length to Beam Ratio: 11.67 : 1
   'Natural speed' for length: 21.43 kts
   Power going to wave formation at top speed: 63 %
   Trim (Max stability = 0, Max steadiness = 100): 69
   Bow angle (Positive = bow angles forward): 20.00 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 %,  16.40 ft / 5.00 m,  16.40 ft / 5.00 m
      - Forward deck:   30.00 %,  16.40 ft / 5.00 m,  14.76 ft / 4.50 m
      - Aft deck:   35.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
      - Quarter deck:   15.00 %,  14.76 ft / 4.50 m,  14.76 ft / 4.50 m
      - Average freeboard:      15.34 ft / 4.68 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 173.0 %
      - Above water (accommodation/working, high = better): 172.8 %
   Waterplane Area: 12,159 Square feet or 1,130 Square metres
   Displacement factor (Displacement / loading): 82 %
   Structure weight / hull surface area: 33 lbs/sq ft or 162 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 0.79
      - Overall: 0.52
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform

4t - 1918 FC
40t - 2x4x21in HW TT Centerline
15t - Enhanced Hydrophones 1915
10t - Sonar
2t - 2 x DC Thrower
10t - Minesweeping Paravanes
20t - 100 x 195kg DC
25t - NF Devices
25t - LR Radio
20t - Enhanced Crew Accommodations