DD-B Class

[TacCovert4]

DD-13, Aztec Destroyer laid down 1915

Displacement:
   998 t light; 1,040 t standard; 1,193 t normal; 1,315 t full load

Dimensions: Length (overall / waterline) x beam x draught (normal/deep)
   (326.57 ft / 322.18 ft) x 28.71 ft x (10.50 / 11.24 ft)
   (99.54 m / 98.20 m) x 8.75 m  x (3.20 / 3.42 m)

Armament:
      6 - 3.94" / 100 mm 50.0 cal guns - 32.30lbs / 14.65kg shells, 150 per gun
     Quick firing guns in deck mounts, 1915 Model
     3 x Twin mounts on centreline, evenly spread
      1 raised mount
      16 - 0.31" / 8.0 mm 60.0 cal guns - 0.02lbs / 0.01kg shells, 1,500 per gun
     Machine guns in deck mounts, 1915 Model
     8 x Twin mounts on sides, evenly spread
      1 - 2.76" / 70.0 mm 50.0 cal gun - 11.09lbs / 5.03kg shells, 200 per gun
     Anti-air gun in deck mount, 1915 Model
     1 x Single mount on centreline, aft deck forward
      1 raised mount
      Weight of broadside 205 lbs / 93 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, 26,540 shp / 19,799 Kw = 31.50 kts
   Range 3,700nm at 14.00 kts
   Bunker at max displacement = 275 tons

Complement:
   100 - 131

Cost:
   £0.198 million / $0.791 million

Distribution of weights at normal displacement:
   Armament: 35 tons, 2.9 %
      - Guns: 35 tons, 2.9 %
   Armour: 9 tons, 0.8 %
      - Armament: 7 tons, 0.6 %
      - Conning Tower: 2 tons, 0.2 %
   Machinery: 640 tons, 53.7 %
   Hull, fittings & equipment: 285 tons, 23.9 %
   Fuel, ammunition & stores: 194 tons, 16.3 %
   Miscellaneous weights: 29 tons, 2.4 %
      - Hull above water: 5 tons
      - On freeboard deck: 18 tons
      - Above deck: 6 tons

Overall survivability and seakeeping ability:
   Survivability (Non-critical penetrating hits needed to sink ship):
     276 lbs / 125 Kg = 9.0 x 3.9 " / 100 mm shells or 0.2 torpedoes
   Stability (Unstable if below 1.00): 1.21
   Metacentric height 1.1 ft / 0.3 m
   Roll period: 11.5 seconds
   Steadiness   - As gun platform (Average = 50 %): 70 %
         - Recoil effect (Restricted arc if above 1.00): 0.35
   Seaboat quality  (Average = 1.00): 0.92

Hull form characteristics:
   Hull has rise forward of midbreak,
     a normal bow and a cruiser stern
   Block coefficient (normal/deep): 0.430 / 0.443
   Length to Beam Ratio: 11.22 : 1
   'Natural speed' for length: 17.95 kts
   Power going to wave formation at top speed: 65 %
   Trim (Max stability = 0, Max steadiness = 100): 76
   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 %,  16.40 ft / 5.00 m,  15.42 ft / 4.70 m
      - Forward deck:   30.00 %,  15.42 ft / 4.70 m,  15.42 ft / 4.70 m
      - Aft deck:   35.00 %,  8.04 ft / 2.45 m,  8.04 ft / 2.45 m
      - Quarter deck:   15.00 %,  8.04 ft / 2.45 m,  8.04 ft / 2.45 m
      - Average freeboard:      11.81 ft / 3.60 m
   Ship tends to be wet forward

Ship space, strength and comments:
   Space   - Hull below water (magazines/engines, low = better): 183.2 %
      - Above water (accommodation/working, high = better): 126.6 %
   Waterplane Area: 5,808 Square feet or 540 Square metres
   Displacement factor (Displacement / loading): 55 %
   Structure weight / hull surface area: 28 lbs/sq ft or 134 Kg/sq metre
   Hull strength (Relative):
      - Cross-sectional: 0.50
      - Longitudinal: 1.27
      - Overall: 0.54
   Cramped machinery, storage, compartmentation space
   Excellent accommodation and workspace room
   Ship has slow, easy roll, a good, steady gun platform
   Poor seaboat, wet and uncomfortable, reduced performance in heavy weather

18t - 2x3x 21in TT on Centerline

8t - 1908 FC
3t - Additional Searchlights and scopes

Trial Speed - 32.51kts